Westinghouse J.L. 41-20lG INSTALLATION • OPERATION • MAINTENANCE

INSTRUCTIONS TYPE CV VOLTAGE RELAY

C AUTION Be fore putting relays into service, remove all blocking which may have been inserted for the pur­pose of securing the parts during shipment , make sure that al l moving parts operate freely, inspect the con­tacts to see that they are clean and close properly, and operate the relay to check the settings and electrical connections.

APPLICATION

The type CV relays are single-phase induction­disc type relays operating either on under or over voltage or both. These relays are applied as a volt­age fault detector operating in conjunction with other protective relays. The relays are also used as timing devices for various automatic operations.

CONTENTS

This instruction leaflet applies to the following types of relays:

CV- 1 Long Time Undervoltage Relay CV-2 Short Time Undervoltage Relay CV-4 Long Tiwe Overvoltage Relay CV-5 Short Time Overvoltage Relay CV-6 Long Time Ov�r or Undervoltage Relay CV-7 Short Time Over or Under voltage Relay CV-8 Low Voltage Pickup Overvo ltage Relay

CONSTR UCT ION AND OPERATION

The types CV-1, CV-2, CV-4, CV-5, CV-6, and CV-7 relays consist of a voltage unit and an indicating contactor switch (ICS). The principal component parts of the relay and their loc ation are shown in figures 1, 2, and 3.

The type CV-8 relay in addition to the above com­ponents also has a capacitor which is series tuned with the main coil of the electromagnet. This tuned circuit offers a low impedance to fundamental current and a high impedance to third harmonic currents. Hence, the relay has a low pick up value for funda­mental voltage and a much higher value of pickup for third harmonic voltage. At rated voltage th e electro­magnet is saturated causing the circuit to be detuned. The impedance o f the circuit is increased and limits the fundamental current to a safe value.

SUPERSEDES I. L. 201 F *Denotes change from superseded i ssue.

A. Voltage Unit (CV) The overvoltage unit operates on the induction­

disc principle. A main tapped co il located on the center leg of an "E" type laminated structure produces a flux which divides and returns through the outer legs. A shading coil causes the flux through the left leg (front view) to lag the main pole flux. The out-of­phase fluxes thus produced in the air gap causes a contact closing torque.

The undervoltage unit operates on the same prin­ciple as the overvoltage unit except the shading coil is on the right leg (front view). This causes the out-of-phase fluxes to produce a contact opening torque.

B. Indicating Contactor Switch (ICS)

T he indicating contact6r switch is a small d-e operated clapper type device . A magnetic armature, to which leaf-spring mounted contacts are attached , is attracted to the magnetic core upon energization of the switc h. When the switch closes, the moving con­tacts bridge two stationary contacts, completing the trip circuit. Also, during this operation two fingers on the armature deflect a spring located on the front of the switch, which allows the operation indicator target to drop. The target is reset from the outside o f the case by a push rod located at the bottom of the case.

The front spring, in addition to holding the target, provides restraint for the armature and thus controls the pic kup value of the switch.

CHARACTERISTICS

The low pickup CV-8 Overvoltage Relay is avail­able w ith the following continuous voltages.

67 volts 199 volts

* The minimum voltage required to just close the CV-8 contacts is 8% of the continuous voltage. Typi­cal operating times of the type CV-8 relay are shown on figure 8. An adjustable 5.4 to 20 volt relay with a 67 volt continuous and a 16 to 40 volt relay with a continuous of 199 volts is also available.

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TYPE CV R ELAYS

1

Fig. 1. Type CV-2 Relay Without Case. 1-Voltage Unit (CV). 2-lndicating Contactor Switch (ICS). 3-lndicating Contactor

Switch Tap Block.

2

3

5

6

4

Fig. 2. Voltage Unit (CV). 1- Tap B lock. 2- Time D ial. 3-Control Spring Assembly. 4-Disc. 5-Stationary Contact Assembly. 6-P e rmanent Magnet.

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TYPECVRELAYS __________________________________________________________ �I. L�-�4�1-� 20�1G

.··�.

Fig. 3. Indicating Contactor Switch (ICS).

The CV - 1 and CV-2 Undervoltage Relays, CV -4 and CV -5 Overvoltage R elays, and CV -6 and CV -7 Over or Undervoltage Relays are available in the following voltage ranges:

R a nge

55-140 55 64 1 10-280 1 10 128

T o p s

70 82 93 105 120 140 140 164 186 210 240 280

A. CV -1 and CV -2 Undervoltage Relays -- CV-4 and CV-5. Overvoltage Relays

Tap value voltage is the minimum voltage re­quired to just close the relay contacts. At this value of voltage, the moving contacts will leave the back­stop of the time dial and move to close the front contacts. Normal operation of the two relays is such that the CV-1 and CV -2 undervoltage relays will open its contacts with application of voltages greater than tap value voltage, while the CV -4 and CV -5 overvolt­age relay closes its contacts with voltages greater than tap value voltage. Thus, the operaJ;ing curves of figures 9 and 10 of the undervoltage relays apply when the voltage is originally higher than tap value voltage and is suddenly reduc ed to a value shown on the curves. The operating c urves of figures 11 and 12 of the overvoltage relays apply when the voltage is initially below tap value voltage and is suddenly raised to a value shown on the curves.

B. CV -6 and CV -7 Over or Undervoltage Relays

Tap value voltage is the value of voltage at which the stationary front contact closes. The stationary back comact will close within 5% of this value.

When the relay is used as an overvoltage relay, the moving contact is made with the stationary back cortaet for vallles of applied voltage less than tap

value voltage. With ap plication of voltages greater than tap value voltage, the moving contact moves to close the front contact in a time as shown by the right-hand curves of either figures 13 or 14 .

When the relay is used as an undervoltage relay , the moving contact i s ma d e with the st ationary front contact for value s of applied voltage greater than tap value voltage. With the application of voltages les s than tap value voltage, the moving cont act moves to close the back contact in a time as shown on the left-hand curves of either figures 13 or 14 .

Trip Circuit

The main contacts will safely close 30 amperes at 250 volts d-e and the seal-in contacts of the indi­cating contactor switch will safely carry this current long enough to trip a circuit breaker.

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TYP E CV RELAYS ____ ________ __ __________________________________________ __

IIOICATHI!o CCMTACTOR 5111 TCH-

� IIOUCTIOM Ulll T

REDIIAIIDLE TEST SWITCH

TEIIMIUl

1 82A72 5

Fig. 4. Internal Schematic of the Double Trip Type CV Un­der or Overvoltage Relays In Type FTJJ Cas•. For the Single Trip Relays the Circuits Associated with T erm/nal 2 are OmiHed.

The indicating contactor switch has two taps that provide a pickup setting of 0. 2 or 2 amperes. To change taps req uires connecting the lead located in front of the tap block to the desired setting by means of a screw connection.

Trip Circuit Constants

Indicating contactor- 0 . 2 amp. tap 6 .5 ohms d-e switch resistance

2 . 0 amp . tap 0. 15 ohms d-e resistance

ENERGY REQU I REMENTS

The burdens of the CV-1. CV-2, CV-4, CV-5, CV-6, CV-7 relays at rated voltage are as follows:

R oted6 T o ps Volt· P ower 120 Volt 240 Volt A mps. F oetor

V olt a g e Relay Relay

55 1 10 64 128

120 or 70 140 82 1 64

240 Volts 93 186 105 2 10 1 20 240 140 280

10.0 . 38 7 . 0 .35 5 . 8 .34 4 . 0 . 33 3 . 1 . 3 1 2 . 4 . 29 1 . 8 . 28 1 . 3 . 26

Watts

3 . 8 2. 5 2 .0 1 . 3 1 . 0

. 7

. 5

. 3

6These relays will continuously stand either 1 10% of rated voltage or tap value voltage, whichever is higher.

4

LEFT WD CONTACT (FIOIT WID!}

IIIOICATIJY COtiTACTOR SWITCH EST SWITCN

FIOIT ¥11¥

1 82A727

Fig. 5. Internal Schematic of the type CV Over or Under­voltage Relay in Type FT l l case.

The burdens of the CV-8 relays at continuous voltage are as follows:

Cant i n u o us V oltage

199 67

* Range

5 . 4 to 20V

16 to 40V

A. C V Unit

Volt A m ps.

30 30

P ower F ac tor

.342

. 342

SETTINGS Settin g Applied Voltage

5 . 4 67

20 67 16 199 4 0 199

Watts

10 10

V A

30

15 30 2 0

The setting of the C V unit can be defined either by tap setting and time dial position or by tap setting and a specific time of operation at some percentage of tap value voltage (e. g. on CV-4 120 tap setting, 2 time dial position or 120 tap setting, 12 seconds at 140 percent of tap value voltage).

To provide selective circuit breaker operation , a minimum coordinating time of 0 .3 seconds plus circuit breaker time is recommended between the relay being set and tbe relays with which coordination is to be effected.

The connector screw on the terminal plate above the time dial connects various -turns of the operating coil. By placing this screw in the various terminal �" plate holes, the relay will just close its contacts at the corresponding voltage of 55-64-7D-82-93-105- 120-140 volts or as marked on the terminal plate.

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TYPECV RELAYS·------------------------------------------------------------���.L�·�41�-2�0�1G

FIIOIIT YIIW

1 82A726

Fig. 6. Internal Schematic of the type CVB 199 volt relay In type F TJ 1 case.

I.ICATIII COlT ACT• IWilCI

r--

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INUitfiiAL SCH(IIIAT C

1

IIDUCliOI Ulll

IUIIlOI

CAPAOilOI

lUl IWilCII

lUIIIIAL

1 88A307

* Fig. 8. lnte1nal Schemati c of the type C V 199 vo lt relay in type F T 1 1 case with adjustable pick up.

IIDitlTIII 1:11111TACTOI SlfiTCM

FIIOIIT YIIW

182A743

Fig. 7. Internal Schematic of the type CVB 67 volt relay In type F T21 case.

IMDICATI•G

COIITACTOft SWITCtt

INTERNAL SCHEMATtc

'" ..._ _________ _

FltONT VI[W

UDUCTIOII UMIT

lEO tlAMDLE

-TEST SWITCh

TERM I HAL

1 85A038

* F ig. 9. In tern al Schematic of the type C VB 67 vo lt relay in type FT21 case w i th adju stable p i ck up.

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TYPE CV R ELAYS __________________________________________________________ _

The nylon screw on the terminal plate holds the tap plate in position when taps are being c hanged. To

use the position on the terminal plate in which the nylon screw is used, remove the nylon screw and place it in one of the unused holes. Then remove the tap screw and insert it in the terminal plate hole.

Instantaneous Reclosing

The factory adjustment of the voltage unit con­tacts provides a contact follow. Where circuit breaker reclosing will be initiated immedi ately after a trip by the over voltage contact, the time of the opening of the contacts should be a minimum. This condition is obtain ed by loosening the stationary contact mounting screw, removing the contact plate and then replacing the plate with the bent en d resting against the contact spring.

For double trip relays, the upper stationary con­tact is adjusted such that the contact rests solidly aga inst the back stop. The lower stationary contact is then adjusted such that both stationary contacts make contact simultaneously with their respective moving contact.

B . Indicating Contactor Switch (ICS)

No setting is required on the ICS unit except the selection of the 0.2 to 2.0 ampere tap setting. This selection is made by connecting the lead loc ated in front of the tap block to the desired setting by means of the oonnecting screw.

INSTALLATION The relays should be mounted on switchboard

panels or their equivalent in a location free from dirt, moisture, excessive vibration, and heat. Mount the relay vertically by me ans of the four mount ing holes on the flange for semi-flush mounting or by means of the rear mounting stud or studs for projection mount­ing. Either a mounting stud or the mounting screws may be utilized for grounding the relay. The elec­trical connections may be made directly to the ter­min als by means of screws for steel panel mounting or to the terminal studs furnished with the relay for thick panel mounting. The terminal studs may be easily removed or inserted by locking two nuts on the stud and then turning the proper nut with a wrench.

For detailed FT Case information refer to I.L. 41-076.

ADJUSTMENTS AND MAINTENANCE

The proper adjustments to insure correct operation of this relay have been made at the factory. Upon receipt of the relay, no customer adjustments, other than those covered under "Settings", should be required.

Acceptance Check

The following check is recommended to insure that the relay is in proper working order:

6

A. CV Unit

1. Contact

a) By turning the time dial, move th e moving contacts until they deflect the stationary contact to a posi­tion where the stationary contact is resting against its backstop. The index·mark located on the move­ment frame should coincide with the "0'' mark on the time diaJ. For double trip relays, the follow on the stationary contacts should be a pproximately 1/64".

b) For relays identified with a "T" , located at lower

left of stationary contact block, the index mark on the movem ent frame will coincide with the "0" mark on the time dial when the stationary contact

has moved through approximately one half of its

normal deflection. Therefore, with the stationary

contact resting against the backstop, the index malk is offset to the right of the "0" mark by ap­proximately .020". (For the type CV- 6 and CV-7

relays the back contact has no follow when the front contact is through one-half of its follow). The placement of the various time di al position s in line

with the index mark will give operating times as shown on the respective time-current curves. For

double trip relays, the follow on the stationary co n­

tacts should be approximately 1/32".

2. Minimum Trip Voltage - Set the time dial to position 6. Alternately apply tap value voltage plus 3% and tap value voltage minus 3%.

a. CV-4 and CV-5 Overvoltage Relays, CV-6 and CV-7 Over or Undervoltage Relays - The moving cont act should leave the backstop at tap value volt­age plus 3% and should return to the backstop at tap value voltage minus 3%.

b. CV-1 and CV-2 Undervoltage Relays- The moving contact should leave the backstop at tap value voltage minus 3% and should return to the back­stop at tap value voltage plus 3%.

c. CV-8 Overvoltage Relays - The moving contact should leave the backstop at 8.5% of contin­uous voltage.

3. Time Curve - Table 1 shows the time c urve calibration points for the various types of relays. With the time dial set to the indicated position, apply the voltages specified in table 1 (e.g. for the CV-4, 140 percent of tap value voltage) and measure the operating time of the relay. The operating time should equal those of table 1 plus or minus 5%.

B . Indicating Contactor Switch (ICS) - Close the main relay contacts and pass sufficient d-e current through the trip circuit to close the contacts of the ICS. This value of current should not be greater than the particular ICS setting being used. The indi­cator target should drop freely.

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P E R CEN T PICK-UP VOLTAGE

TYPICAL TIME CURVES TYPE CV-8

OVER VOLTAGE RELAY

60 CYCLES

DIAL SETTING

.. I'-

1�00

Curve 4182 52

Fig . 10. Typical 60-cyc le t ime c urves of the type CVB Low P ic k up Overvoltage Relay.

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TYPECVRELAYS __________________________________________________________ __

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8

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Fig . 1 1 . Typical 60-cycle time curves or the type CVl Long Time Undervoltoge Relay.

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TYPECV RELAYS--------------------------------------------------------���.L�·�41�-2�0�1G

0

TY,ICAL T I ME CURVES

TYP E CV-2

UNDER VOLTAGE REL AY

60 CYCLES

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Fig. 1 2. Typical 60-cyc/e Time curves ol the type CV2 Short Time Unclervoltage Relay.

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TYPECVRELAYS ____________________ __ __ ____ __ ______________________ ____ __

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P E R C E N T OF TAP VALUE VOLTAGE

406C881

Fig. 73. Typical 60-cycle time curves ol the type CV4 Long Time Overvoltage Relay.

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TYPECV RELAYS--------------------------------------------------------�'·�L�-�41�-2�0�1G

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TYPECVRELAYS·----------------------------------------------------------

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406C882

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TYPECVRELAYS ___________________________________________________________ I.L_._4_1-_20_1_G

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Fig. 16. Typical 60-cycfe time curves ol the type CV7 Short Time Over and Undervoltage Relay.

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TYPECVRELAYS�---------------------------------------------------------

}TO TIMER START

(TIMER STOPS IIHEM AUX. RELAY CONTACT OPENS)

(TIMER STARTS IIHEM SWITCH "S" CLOSES)

A. C. SUPPLY

1 83A02 3

Fig. 1 7 . Diagram ofTest Connections ofthe type CV Under­voltage Relay.

The contact gap should be approximately .047" between the bridging moving contact and the adjust­

able stationary contacts. The bridging moving con­

tact should touch both stationary contacts simultan­eously.

Routine Maintenance

All relays should be inspected periodically and the time of operation should be c hecked at least once every year or at such other time intervals as may be dictated by experience to be suitable to the particular app lication. Phantom loads should not be used in testing induction-type relays because of the resulting distorted current wave form which produces an error in timing.

All contacts should be periodically cleaned. A contact burnisher S1tl82A836H01 is recommended for this purpose. The use of abrasive material for clean­ing contacts is not recommended, because of the dan­ger of embedding small particles in the face of the soft silver contact and thus impairing the contact.

Calibration

Use the following procedure for calibrating the relay if the relay has been taken apart for repairs, or the adjustments have been disturbed. This procedure should not be used until it is apparent that the relay is not in proper working order (See "Acceptance check").

1 4

} TO TIMER START

(TIMER STOPS OHEN AUX. RELAY CONTACT OPENS)

( Tl MER STARTS OHEN SWITCH 'S" CLOSES)

TEST SWITCH

L-----��------

----_.--Q t::�·-

s_•_A_.C_.-�-PP-LY-

183A024

Fig. 18. Diagram of Test Connections of the type CV Over• voltage Relay.

A. CV Unit

1. Contact

a) By turning the time dial, move the moving contacts

until they deflect the stationary contact to a posi­

tion where the stationary contact is resting against

its back stop. The index mark located on the move­

ment frame should coincide with the "0" mark on

the time diaL For double trip relays, the foll ow on

the stationary contacts should be approximately

1/64".

b) For relays identified with a "T" , located at lower

left of stationary contact block, the index mark on

the moveme nt frame will coincide with the "0,. mark on the time dial when the stationary contact

has moved through approximately one half of its

normal deflection. Therefore, with the stationary

contact resting against the backstop, the index

mark is offset to the right of the "0,. mark by ap­

proximately .020". (For the type CV-6 and CV-7

relays the back contact has no follow when the

front contact is throug h one-half of its foll ow). The

placement of the various time dial positions in 1 ine

with the index mark will give operating times as

shown on the respective time-current curves. For

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TYPE CVRELAYS'--------------------------------------------------------'·_L_._41�·2_0�1G

double trip rel ay s, the foll ow on the stationary con­tacts should be approximately 1/ 3 2 ...

2. Minimum Trip-V oltage - The adj ustment of the spring tension in setting the minimum trip voltage value of the relay is most conveniently made with the damping magnet removed.

With the time dial set on "0", wind up the spiral spring by means of the spring adj uster until approxi­mately 6-3/4 convolutions show.

Set the relay on the minimum tap setting and the time dial to position 6.

a. CV -4 and CV -5 Overvoltage, CV -6 and CV -7 Over or Undervoltage - Adjust the control spring tension so that the moving contact will leave the backstop of the time dial at tap value voltage +1 .0% and will return to the backstop at tap value voltage - 1.0%.

b. CV -1 and CV -2 Undervoltage Relays - Ad­just the control spring tension so that the moving con­tact will leave the backstop of the time dial at tap value voltage -1 .0% and will return to the backstop at tap value voltage + 1. ()%.

c. Low Pickup Overvoltage Relav - Adjust the oortrol spring so that the moving contact will leave the backstop of the time dial at 8 . 1 % of continu­ous voltage and return at 7.9% of continuous voltage.

3. Time Curve Calibration - Install the permanent magnet.

a. CV -1 and CV -2 Undervoltage Relay - use test circuit of figure 15. With switch "8" opened, ad­just resistor "A" until voltmeter reads tap value volt­age or higher. Close switch "8" and adjust resistor "B" until the voltmeter reads 50 percent of tap value voltage. Ope n switch "8" and allow the moving con­tact to move to the backstop of the time dial. Close switch "8" and measure operating time.

Adjust the permanent magnet gap until the oper­ating time corresponds to the value given in table 1 .

b . CV -4 and CV-5 Overvoltage Relay, CV-8 Low Pickup Overvoltage Relay - Apply the indi cated voltage of table 1 and measure the operating time. Adjust the permanent magnet keeper until the oper­ating time corresponds to the value given in table 1 .

c . CV -6 and CV -7 Over or Undervoltage R elay - Apply the indicated voltage of table 1 artd measlJ'e the operating time. Adjust the permanent magnet keeper until the operating time corresponds to the value given in table 1 .

Measure the reset time o f the disc from the station­ary front contact to the stationary back contact. This time should be as shown in table 1 .

TABL E I

P erc e nt T a p Time O p e r ating R e set Type V a l ue V o lt a g e Or Di a l Time Time R e l a y Pick up V o lt a g e Setting in Sec . in Sec .

CV 1 50 6 68 CV 2 50 6 8. 6 CV 4 140 6 37.5 CV 5 140 6 6.8 CV 6 140 6 33 3 2. 5 CV 7 140 6 5 . 9 5 . 7 CV8 800 6 3 . 0

B . Indicating Contactor Switch - Unit (ICS) - Close the main relay contacts and pass suffici ent d-e cur­rent through the trip circuit to close the contacts of the ICS. This value of current should not be greater than the particular ICS setting being used. The indi­cator target should drop freely.

RENEWAL PARTS

Repair work can be done most satisfactorily at the factory. However, interchangeable parts can be furnished to the customers who are equipped for doing repair work. When ordering parts, always give the complete nameplate data.

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16

TEIIMIUL AIID MOUniiG DETAILS

--(5 ���t "DIA. q HOLES FOR lnf . I90-32 �3. SCREW�

2ft I+-

'

. .....

PAIIEL DRILLIIIG OR CUTOUT FOR PRO«CTIOI MTG.

(FROIT YIEW)

� _3, �, �) T£11111Al rtf IIUMBEI

Fig. 79· Outline and d ·tt·

57 -D-7900

" '"9 for F T Jl case used for projection and/or se . f/ m•· ush case.

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TYPE CV RELAYS----------------------------------------------------------��·�L�·�41�-2�0�1G

w Cl) oC u

.. � -

3.!. r--II -•!--

i _1__ I : : I I II II 11 11 11 11 II I I

NIIEL �TIOII� SEMI FWSH M\'1._/ / PICW!CTIOII MTI •

• I 10-32 SCit£W TOOTli£D LOCDMSKEJ

PAIIEL

3PACEIS FIJI THIII1U£LS

.!. -11 SCit£W II �FIJI THICK

MEL USE I li -·· mD) ,190-32 SCREW

I 'i"DIA.IO KOW OR CUT OUT

TERMIIIAL AIID ICIUIITIMCI DETAILS

r I ��--1 .!. DIA •• KCUS F01 2 21 ---1 - I ./' . 1 10-12 Nri.ICIM

32 ¥-_,!!

PAIIEL DRILLIIIQ 011 CUTOUT FOil PIOJECTICIII Nrl.

( FROIIT VIEW)

:lrL

N

57-D-7901

Fig. 20. Outline and drilling for FT21 c ase used for projec tion and/or se mi- flush case. (For 67 volt CV-8 relay only)

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WESTINGHOUSE ELECTRIC CORPORATION R E LAY- INSTRUM ENT D IVI S I O N NEWARK, N. J.

Printed in U.S.A. www . El

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I N ST A L L A TI O N Westinghouse 1 . L . 41-20l .2B

• O P E R A T I O N • M A I N TEN A N C E

INSTRUC T I ON S TYPE CV FREQUENCY

COMPENSATED VOLTAGE RELAY

C A U TIO N : Before putting relays i nto service , re­

move all blocking w hich m ay hav e been inserted for

the p urpo se of securing the parts during ship ment,

make sure that all moving parts operate fr eely, in­

spect the contacts to see that t hey are cl ean and

operate the relay to check t he settings and elec­

trical connectio ns.

A P P L I C A T I O N

The type CV relays are single-p hase induction­

disc type relays operating either on under or over

voltage or both. Thes e relays are frequency com­

p ensated such that their pickup between 30 and 90

cycles is within 5 per cent o f the 60 cycl e value .

C O N T E N T S

This i nstruction leaflet applies t o the following

typ es of relays.

CV- 2 1 Long Time Undervoltage Relay

CV- 22 Short Time Undervoltage Relay

CV- 24 Long Tim e Overvoltage Relay

CV- 25 Short Time Overvoltage Relay

CV- 26 Long Time Over or Und ervolt age Relay

CV- 2 7 Short Time Over or Undervoltage Relay.

C O N S T R U C T I O N & O P E R A T I O N

The typ e s CV- 2 1 , CV- 2 2 , CV- 2 4 , CV- 25, CV- 26,

and CV- 27 relays consist of a voltage unit and an

indicating cont actor switch ( ICS) . The compon ent

p arts of t he relays are connect ed as shown in the

internal schematic diagram . Som e style relays c on­

tain an i nstantaneous indicating voltage switch

( !IV) w hi c h also operates indep endent of frequency.

A. Vol tage Un i t (CV)

The overvoltage unit is an "E" typ e laminated

structure with coil s o n each leg. The coil o n the

center leg of the structure is an autotransformer ,

SU PERSEDES I . L. 41-201.2A * Denotes change from su perseded 1 ssue.

winding with a tapp ed primary. The seco ndary

winding of the autotransformer is connected to

id entical coil s o n the o uter legs of the "E" typ e

laminated structure. The coil s are connected in such a manner that the co mbination of all the fl uxes

produced re sult in out-of-phase fluxes in the air gap.

The out- o f-phas e air gap fluxes produced cause a

contact clo sing torque.

The und ervoltage unit op erates on the same

principle as the over voltage unit exceiJt the con­

nections to the leg coils ar e reversed to cause the

out-of-p hase fluxes to produce a contact opening

torque.

The u nits are frequency comp ensated by means

of a resistor located in the o uter l e g coil circuit.

The instantaneous trip unit is a small a- c oper­

ated clapp er typ e device. A m agnetic armature , to

w hich leaf- spring mounted cont act s are attached, is

attracted to the m agnetic core upon energization of

the switch. When t he switch closes, t he moving con­

tacts bridge two st ati onary contacts completing the

trip circuit. Also during the operation two fi ngers on

the arm ature deflect a spring located on t he front o f t h e switch which allows t h e operation indicator target to drop. The target is reset from the outside

of the case by a push rod lo cated at the bottom o f

t h e cover.

The adj ustable pickup range is ac complished by

m eans of an adj ustable resistor.

C. Indicat ing Contoctor Switch ( ICS)

The indicating contactor switch is a s mall d- e

op erated clapper type device. A m agnetic arm ature ,

to w hich leaf- spring mo unted contacts are attached ,

is attracted to the magnetic core upon energization

of the switch. When the switch clo s e s , the moving

contacts bridge two statio nary contact s , completing

the trip circuit. Al so , during this operation two

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TYP E CV R ELAY ________________________________________________ _

I I I ICATIIIG C ITACTOR SWI TCH

CQNTACT POS I T I ON RELAY DE·EMEIIGIZ£0 OVER-VOLTAGE • OP£11 UMDER-YOL T AGE -CLOSED

INTERNAL SCHEMATIC

I IIDUCTION UN I T

INDUCTION UMIT

LAG COILS

RED H.I.MOLE

fEST SWITCH

TERMIIIAL

185Al33 Fig. 1 Internal Schemati c for the type CV (S. P . S. T. )

voltage relay in the FT- 1 1 case.

fingers on the armature deflect a spring l ocated on

front of the switch, which allows the op eration in­

dicator target to drop. The target is reset from the

outside o f the case by a push rod located at the

botto m o f the case.

The front spring, in addition to holding the

target , provides restraint for the armature and thus

controls the pickup val ue of the s witch.

C H A R A C T E R I S T I C S The s e rel ays are frequency compensated such that

their pickup between 30 and 90 cycles is within 5%

of the 60 cycle value.

The CV-2 1 and CV- 2 2 undervoltage rel ays , CV- 24

and CV- 25 o vervoltage relay s , and CV- 26 and CV- 27

over or und ervoltage rel ays are available in the

voltage ranges:

Range

5 5- 1 40

1 1 0- 280

Tap s

5 5 6 4 70 8 2 9 3 1 0 5 1 20 140

1 10 1 28 140 164 1 86 2 10 240 280

A. CV-2 1 and CV-22 Undervo l tage Rel ays CV-24 and CV-25 Overvo l tage Relays.

Tap value voltage i s the minimum voltage re­

quired to just clo s e the relay contacts. At this

val u e o f voltage, the moving contacts will leave

the back stop of the ti me dial and move to clo s e the

2

IMDICATIIIG-­CONTACTOR SWITCH -

CDtiTACT POS I T I DIIS ­RELAY DE-ENERGIZED OVER·YOLUGE - OPEN UNDER-VOLTAGE-CLOSED

INTERNAl SCHEMATIC

� INDUCTION UNIT

185Al34 Fig. 2 Internal Schematic for the 'type CV (D. P . S. T. )

voltage relay in the FT- 11 case.

front contacts . Normal op eration of the two relays

is such that the CV- 2 1 and CV- 2 2 undervoltage

relays will open its contacts with appl ication of

voltages greater than tap value voltag e , while the

CV- 24 and CV- 25 o vervoltage rel ay cl o ses its con­

tacts with voltages greater than tap value vol tage.

B. CV-26 and CV-27 Over or Undervol tage Rel ays

Tap value voltage i s the value of voltage at

which the stationary front contact clos e s . The

stationary b ack contact will close within 5% of this

value .

When the relay is used as an overvoltage relay,

the moving contact i s m ade with the s tationary back

contact for values of applied voltage l e s s than t ap

value voltage. With application of voltages great er

than tap value voltage , the mo ving c ontact moves t o

close the front cont act in a t i m e a s s hown b y the

right hand curve of either Fig . 8 or 9.

When the relay is used as an undervolt age relay ,

t h e moving contact is m ade w i t h t h e s tationary front

contact for values of app lied vo ltag e greater than tap

value voltage. With the application of voltages l e s s

than tap val ue volt age, the moving contact m o v e s t o

close t h e b ack contact in a t i m e a s shown on the

l eft-h and curves of either fi gures 8 or 9 .

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TYPE CV RELAY I . L . 41 -2o1 .2 a * TABL E A

Rated T A P S

Voltage 1 20 Volt Relay 240 Volt Relay --·

55 1 10

64 1 28

70 1 4 0

8 2 1 64 1 20 or

240 Volts

93 1 86

1 0 5 2 10

1 20 240

1 40 280

C. Instantaneous Ind icat ing Vol tage Swi tch ( I I V)

The range of op eration is 1 20 to 200 volts ac. The

pickup is adj usted by m eans of an adj ustable resis­

tor.

Tri p C i rcu it

The m ain contacts will safely cl ose 30 amp eres

at 250 volts d-e and the seal- in co ntacts of the

indicating contactor s witch will safely carry this

current long enough to trip a circuit breaker.

The indicating contactor switch has two tap s

that provide a pickup setting of 0 . 2 or 2 amperes. To

chang e tap s requires connecting the lead lo cated in

front of the tap block to the de sired s etting by means

of a screw connectio n.

Trip C i rcu i t Constants

Indicating contactor - 0 . 2 Amp . tap 6 . 5 ohms d- e Switch resi stance

* 2 Amp. tap 0. 15 ohms d- e

resistance

E N E R G Y R E Q U I R E M E N T S *

The b urdens of t he CV-2 1 , C V-2 2 , CV-24 , C V-25 ,

CV-26 , CV-27 relays at rated v oltage are s hown in

Table A above .

The b urden of the 1 1 V ( when us ed) is in addition

to the above burdens and is as foll ow s :

setting

1 20 Volts

200 Volts

Voltage Applied ----

1 20 Volts

200 Volts

Burden

2 . 0 VA . 3 . 0 VA.

Power Volt- Amp s .

F actor Watts

1 4 . 3 8 . 44 6 . 3

1 0 . 38 . 4 1 4 . 23

8 . 3 5 . 39 3 . 26

6 . 00 . 37 2 . 23

4 . 6 6 3 5 1 . 63

3 . 64 . 34 1 . 25

2 . 7 7 . 3 3 . 9 2

2 . 0 4 0 3 1 . 63

S E T T I N G S

A. CV Un it

T h e setting of t h e CV unit can b e defined either

by tap setting and tim e dial p o sition or by tap set­

ting and .a specific time of op eration at some per­

centage of tap val ue voltage ( e . g. on CV- 24 1 20 tap

setting, 2 time dial po sition or 1 20 tap setting, 1 2

seconds at 1 40 per cent o f tap value voltage).

To p rovide sel ective circuit br eak er op eratio n ,

a m inimum coordinating t i m e o f 0 . 3 seconds plus

circuit breaker time i s r ecommended b etween the

relay b eing set and t he relay s with w hich coordina­

tion i s to be effected.

The connector screw o n the terminal plate above

the time dial connects v arious turns of the operating

coiL By placing t his screw in the various terminal

plate hol e s , the relay will j ust clo se its contacts at

the corresponding voltage of 55- 64- 7 0- 8 2- 93- 1 05- 1 20-

1 50 volts or as m arked on the terminal plat e .

T he nylon screw on the terminal plate holds the

tap plate i n po sition when taps are b eing changed.

To use the po sition on the terminal plate in which

the nylon screw is us ed, remove the nylon s crew and

place it in one of the unused holes. T hen r e move t he

tap screw and insert it in the terminal plate hol e.

I nstantaneous Rec los ing

T he factory adj ustment. of t h e voltage unit con­

t acts provide s a contact follow . W here circuit break­

er reclo sing will b e initiated immediately after a

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TYP E C V R ELAY ________________________________________________ __

l[FT HAND CONTACT ( FRONT Y I E'W )

R I GHT H U D CONTACT ( FROIIT Y I £W)

I N D I C A T I II G __­COIITlCTOR SWI TCH

cv

I"DUC T I OII UII I T

L A G COILS

ED HAKOLE

TEST SWITCH

T£RMIIIAL

185Al35 Fig. 3 Internal Schematic fo r the type C V (S. P . D. T. )

voltage relay in the F T- 11 case.

trip by the o vervoltage contact, the time of the

opening of the contacts should be a minimum. This

condition i s o btained b y loos ening the s tationary

contact mounting screw, remo ving the contact plate

and then replacing the plate with the bent end rest­

ing against the contact spring.

For double trip relay s , the upper statio nary con­

tact is adj usted such that the contact rests solidly

against the back stop . The lower stationary con­

tact is then adjusted such that both stationary con­

tacts m ak e contact simultaneously with their res­

pective moving contact .

B . Instantaneous Ind i cating Voltage Switch ( I I V)

The adj ustabl e resistor must be adj ust ed for the

desired pickup voltage.

C. I nd i cati ng Contacto��_t_c:h_il9}_

Only one setting is required on the ICS unit;

that i s , the selection of the 0 . 2 to 2 . 0 amp ere tap

setting. This sel ection is m ade by connecting the

l e ad located in front o f the tap block to the desired

setting by m ean s of the connecting screw.

I N S T A L L A T I O N

The relays should be mo unted on switchbo ard

p anels or their equivalent in a location free fro m

dirt, moisture, excessive vibration , and heat . Mount

4

the relay vertically by means of the four mounting

holes on the flange for semi-flush m o unti n g or by

me ans o f the rear mo unting stud o r studs for p ro­

j ection mountin g . Eith er a mounting stud or the

mounting screws m ay be utilized for grounding the

relay. The electri c al connections may be m ade dir­

ectly to the terminal s by mean s of screws for steel

panel mo unting or to the terminal stud s furnished

with the relay for thick panel mo unting . The ter­

minal studs may be eas ily removed or inserted by

locking two nuts on the stud and then turning the

the proper nut with a wrench.

For detail ed FT Case information refer to I . L .

4 1- 0 7 6 .

A D J U S T M E N T S & M A I N T E N A N C E

The proper adj ustments to insure correct opera­

tion of this relay h ave been m ade at the factory.

Upon receipt of the relay, no customer adjustment s ,

other than tho se covered under "Settings , " should

be required.

Acceptance Check

The following check i s recommended to insure

that the relay is in proper work ing order:

A. CV Un i t

Contact

The index m ark on the movement frame will

coincide with the "0" mark on the time dial

w hen the stationary contact has moved

through approximately o n e h alf of its normal

deflection. Therefore , w ith the stationary

contact resting against the back sto p , t h e

i n d e x mark is offs et to t h e right of t h e " 0 " mark by approximat ely . 0 2 0 " . ( For t h e typ e

CV- 2 6 and CV- 27 relays the b ack cont act has

no follow when the front contact is through

one-half of its follo w ). The p l acem ent of the

various time dial po sitions in line with the

index m ark will give op erating times as

s hown o n the r e sp ective time- c urrent curves.

For double trip relays, the follow o n the

stationary contacts s hould be approximately

1 / 3 2 " .

2 . Minimum Trip Voltage - set t h e time dial to

po sition 6. Alternately apply tap value volt­

age plus 3% and tap val ue voltage minus 3%.

a. CV- 24 and CV- 25 Ov ervoltage Rel ay s ,

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TY P E CV R ELAY----------------------------------------------------���.L�-�41�-2�0l�J�_s

CV- 2 6 and CV- 27 Over or Undervoltage

Relays - The movi ng c ontact should

leav e the back stop at tap value voltage

plus 3% and sho uld return to the b ack­

stop at tap value voltage minus 3%

b. CV- 2 1 and CV- 2 2 Undervolt age Relays

The moving contact s ho uld le ave the

b ack stop at t ap value voltage minus 3%

and should return to the b ackstop at tap

value voltage plus 3%.

3 . In stantaneous Indicating Voltage Switch (liV) ­Apply de sired pickup voltage and adjust the

internal adj ustable resi stor until the con­

tacts j ust m ake. The t arget s hould drop

freely.

4 . Indicating Contacto r Switch (ICS) - Close

the m ain relay contacts and p as s sufficient

d-e current t hrough the trip circuit to close

the contacts o f the res . This value of cur­

rent should be not gr eater than the particul ar

res tap setting being used. The op eration

indicator target should drop freely.

The contact gap should b e appro ximately

. 047" between t he bridging m o ving contact

and the adj ustable stationary contacts . The

bridging mo ving could touch both stationary

contacts simultaneously.

Routing Maintenance

All relays should b e inspected periodically

and the time o f op eration s hould b e checked at

least once every year o r at such other time intervals

as may b e dictated by experience to be suitable to

t he particular application. T he use of phantom loads,

in testing induction- typ e relay s , should be avoided,

since the resulting distorted current wave form will

produce an error in timing.

All contacts should be perio dically cleaned. A

contact burnisher # l 82A836H0 1 i s recomm ended for

this purpose. The u s e of abr asive material for cl e an­

ing contacts i s not recomme nded, b ecause of the

danger of embedding small p articl es in the face o f

t h e soft fil v e r and t h u s , impairing t he contact.

Cal ibration

Use the following p rocedure for calibrating the

relay if t he relay has been tak e n apart for rep airs ,

or the adjustm ents have been distrubed. This proce­

dure should not be used until it i s app arent that the

relay is not i n prop er working o rder (See "Accept­

anc e check " )

A. CV Unit

1 . Contact

The index m ark on the mo ve ment frame will

coincide with the " 0 " m ark on the time dial

when the stationary contact h as moved

through approximately one half of its normal

deflectio n . Therefore , with the stationary

contact re sting against the b ack stop , the

index mark is offset to the right of the "0 " m ark by approximately . 0 20 " . (For the typ e

cv- 26 and cv- 2 7 relays the b ack contact h as

no follow w hen the front contact is t hrough

one-half of its follow ) . T he placement of the

v arious time dial po sitions in line with the

index m ark will give operating times as

shown on the respective time- current curves.

For double trip r el ay s , the follow on the

stationary contacts s hould b e app roximately

1 / 3 2 " .

2 . Minimum Trip Voltage

The adj ustment of the spring tension in

setting t he minimum trip voltage value of the

relay is most conve ni ently m ade with the

damping m agnet removed . * Set the relay o n the m inimum tap setti ng .

Adj ust the spring until the c ontact j ust

leaves the b ackstop of the t ime dial at the

1 0Yz positi o n within 0.5 volt of t he value

that it j u st leav e s t he bac kstop with t he tim e

dial set at the lh position. Set the relay on the 6 time po sitio n .

a. CV- 24 and CV- 25 Overvoltage, CV- 26

and CV- 27 Over or Und ervoltage - Adj ust

the resistor in t he rear so that the moving

contact will 1 eave the b ack stop of the

time dial at t ap val ue v oltage + 1 . 0% and

will return to the back stop at tap value

voltage - 1 . 0%.

b . CV- 2 1 and CV- 2 2 Undervoltage Relays -

Adjust t he r esistor in the rear so that the

moving contact will leave the b ackstop of

the time dial at tap value voltage - 1 . 0%

and will return to the back stop at tap

value voltage + 1 . 0%.

3. Install the perman ent m agnet.

a. CV- 2 1 and CV- 2 2 Undervoltage Relay -

U s e designated test circuit. With switch

"S " opened, adjust resistor " A " until

voltmeter reads tap value voltage or

higher . Clo se s witch "S" and adjust

re sistor ' 'B ' ' until the voltmeter reads

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TYP E CV R ELAY ________________________________________________ _

6

T A B L E I

Typ e P ercent Tap

Rel ay V alue Voltage Or

P ickup Voltage

CV 2 1 50

CV- 2 2 5 0

CV- 24 1 40

CV- 25 1 40

CV- 26 1 40

CV- 27 1 4 0

40 p er cent of t ap value voltage. Open

switch "S " and allow the moving contact

to move to the back stop of the time dial .

Clo se s witch "S " and m e asure op erating

tim e .

Adj ust the permanent m agnet gap until

the operati n g time corresponds to the

value given in table L

b . CV-24 and CV- 25 O vervol t age Relay -

Apply the i ndicated voltage of table 1 and

m eas ure the op erating time. Adj ust the

permanent m agnet k e eper until the operat­

ing time c orresponds to the val ue given in

table L

c . CV- 2 6 and CV- 27 Over or Undervoltage

Relay - Apply the i ndic ated voltage of

table 1 and m easure the operating ti m e .

Adj ust t h e p ermanent m agnet keeper until

the op erating time corresponds to the

value given in table L Measure the reset time of the dis c from

the stationary front contact to the station­

ary back contact. This time should be as

shown in table 1 .

I

Time Operating Reset Dial Tim e Time

Setting in Sec. in Sec.

6 68

6 8 . 6

6 3 7 . 5

6 6 . 8

6 3 3 3 2 . 5

6 5 . 9 I 5 . 7

B . I n stantaneous Indi cati ng Vo ltage Swi tch ( I I V)

The contact gap should be 3/32 ± 1 / 64 between

the bridging cont act and the adj ustable statio nary

contacts. The bridging moving contact s hould touch

bo th station ery contact s simultaneously . When the

arm ature is fully picked up there should b e some

wipe of the contact s .

T h e core screw should be all the way i n prior t o

setting the p ickup . Apply de sired pickup voltage

and adj ust the adj ustable resistor until the contact s

j ust mak e. The target should drop at the same time.

C. I n di cati ng C()lltactor Swi t�h_- Uni_t_(ICSl_

Clo s e the m ain relay contacts and p as s s u f­fi cient d-e current through the trip circuit to close

the co ntacts of the res. This value of current should

not be greater than the particular res settin g being

used. The indicator target should drop fr eely.

R E N E W A L P A R T S

Repair work can b e done most satisfactorily at

the factory. Ho wever, i nterchangeable parts can be

furnished to the customers who are equipped for

doing repair work . When ordering part s , always give

the complete name data.

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TYPE CV RELAY ___________________________________________________ ,_.

L_. _

41�

��

o1_.

2�

B

11 11 1 11 11 1 I I I I I 160

f- TYP I CAL T t ME CURVES t-- TYPl CY 1- 1 50 f- UMOER VOlTAGE RELAY 1- 60 CYCL ES fT II f- Il l IT 1 �0

If 1/ IJ 1/ 1 30

II J 1/ 1/ J --, 1 1 1 20

t-r- -I 1 10 II J

/ 1 J 11 1./ 1 00 l..ol If rT T I M E 0 1 AL SETT UH """ 1/ _ I I 7 r,- J II .... I-' u · [,i [.; rT 90 l.oof-'"

�.ooloooo 1 0 L; II' IT / I V) ,; II

g 0 .... 80 �

l.ool-' a' � 1/ 7 u ""' II' w

1,; ..... ./ 7 II V) ... 7 � 70 7 1,; � l.oo II' .... 6 j 1/ I;' 60 .... 7 7 1-' 5 ... 1/ � II" J.,. .... � � 50 L,.. ... 1-- .... ..... 3 1/ .... � 1-1-+-" J.o' 1/

... 2 IJ ......... ),<' 30 IJ I

j..o 1 J.,..j;O 20 � � L,.. /2 j;;li"' ... 1 0 L...oi"" L...o ....

0 0 10 20 30 l+O 50 60 70 80 go 1 00

P ER CENT TAP VALUE VOLTAGE Curve 418251 Fig. 4 Typ ical 60-cycle time curves or the type CV- 2 1 Long Time Undervo ltage Re lay.

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TYP E CV R EL AY-------------------------

0

8

lYr i CAL T I ME CURVES

TYPE C�

UNDER VOL TAGE REl AY

60 CYCL ES

•

1 1 .

II I II I

I

ll I I ll l

II II I II II I J

_l

IJ II

II II 1 r , , If II

IL_ Ll 'I lJ � I

If' J I It' J ,l

� I; It' L IJ I II T l �I D I Al SETTIN G

I' io"" If" I I I "" 1.;' � LJ IJ I I I I

1 1 ,_ !.;' 1..1' !I IJ "" � � � If II .... r- 10 I.; ...... 1 IL J .... B � 1.;'

.... � 8 ... "" J J I I""' 7 I' .,. 'I I-' , . 6 1/ I"" � ... � I' ...... 5 If" 1/ ""'""" """' � I"" � � II

...... 3 , ... ,... II" , , . - 2 .... I""' 1.;'

1

. ,J/'E � I . I I I I 10 20 30 �0 50 60 70 80

PER CEN T TAP VAL U E VOL TAGE

I II

II

II

90

32

30

28

26

22

20

18

U)

1 6 �

1 �

1 2

10

8

0 ,,

2

0 100

0 u \.LI U)

Cu...-ve 418250 F i g. 5 Typical 60- cycle Time curves of the type CV-22 Short T ime Undervo ltage R elay.

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TYPE CV RELAY ____________________________________________________ I

.L_._

41_

�_

o_L

_2 B

1 60

1 50

1 110

130

120

(/) a

1 10

100

90

z 80 8 .... (/)

70

60

50

110

30

20

1 0

0 0

::'\;

8

7

0 !5

II 3

2

IS 1 r "': . 1/!)

1 10 120 130 1 110

TYP I CA L T I M E C U R V ES

T Y P E C 'i

OVER VOL T AG E R E L A Y

60 CYCL ES

IS 1 1 T I E D I A L SET T I N G

10

g

1 50 160 170 180 1 90 200 210 220 230 2110 2!50 P E R C E N T OF TAP V A L U E VOL TAGE

4o6C881 Fig. 6 Typical 60- cyc/e time curves of the type CV- 24 Long Time Overvoltoge Relay.

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TYPE CV R ELAY ________________________________________________ __

10

en 1M ,.. > c ... � ::I ...

u ... en ... ... ... :Z: > UO � u c u .... .... ,..

... .... .., -' L O . ,.. .., .... -

L ,.. ....

>

c ... > 0

... ..

0 co

f !

l

;z -

t-t-... <J') ..... c -

0 ...

:z: ....

-- � a.

Q) r-

<() 10

� (')

"'

-

;I Gil - -

Fig. 7 Typ ical 60- cycle time curves of the type C V-25 Short Time Overvoltage Relay.

� � co 0 \0 0 ...::t ! 0

tQ 0 ,._ "'

0 C) "'

� "'

� � "'

0 "' "'

... <.5 o -c ... .... "' �

0 > ...

0 :::0 0 -' "' ..

>

L o c � ....

.... ;z ...

o u CD - a: ... L

0 r--

0 co -

0 tO

g -

0 M

"' ..... -

0 "' -

0 -

8 ...

0

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TYPE CV RELAY ______________________________________________________ I

._L

_.4_

1_-2

_o1

_.2

_B

..

� ... ... c ... ... > .. c c :::> ,_ u ... i :: ll > ... - u a:: u ,_ ... ... "' 0 U ..... ... .. <C >- ::J O 0 ,_ C>

0 .... .. ... .. .... "' ...

> 0

0 "'

0 0

0 <D

so Nons

0 ....

"'

,_ ....

"' ... ..

... % ....

<D

- sa

....

0 It)

"' .. ....

i! ...

0 � 0 ... "'

0 ... N

� N

8 N

0 � 0 !!! 0 � � 0 "'

:i ... _ .... .. ,_ "' ...

0 0 "' > - ... 3

c 0 > � "' - a.. ..

,_

0 ,_ - :;.!:!: _ ..,

0

a:

0 � o§� 0 "'

� 0 a>

"' 0 ....

0 <D

0 "'

0 :#

� 0 N

� 0

Fig. B Typ ical 60- cyc/e time curves of the type CV-26 Long Time Over and Undervoltage Relay.

C\1 co co 0 \.0 0 .=t

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-N

:!! '!l '()

-t '< "tl n 2.. 0. ? n '< n iD ... 3' .,. n c: ... '< .,. .. 0 ..... ;. .,.

� .,. I') ;::: N � "' � � -t 3 .,. 0 '< .,. ... Q ::J Q, c: ::J :} ... '< 2.. ii IQ .,. :0 .,. Q �

11

10

...

6

10 20 30 �0 50 60

T I NE D I AL SETT I NG '

11,

l!l ll l l�llrHJii1llF:}

1/2 H-EI::l-ttU lin ! I ! ! I ! I ! I I I II ! ! ! ! I I I ! I I 70 80 90 IOD 1 10 120 130 1�0 1 50 160 170 180 190 200 2 1 0 220 230

PER CENT OF TAP VALUE VOL UGE

TYPICAL T INE CURVES

TYPE CV

OVER AIID UNDER VOLTAGE RELAY

60 CYCLES

• 2� 250 250 270 280 290 300

4o6c883

-f -< "'tJ m n < ;;o m r­> -<

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TYPE CV R ELAY

, To :' T I MER

STOP

' TO I T I MER

) START

( T I MER STOPS WHEN AUX. RELAY CONTACT OPEN S )

( T I MER STARTS WHEN SWI TCH "S" CLOSES)

A. C. SUPPLY

183A023 Fig. 10 Diagram of test conn ections for Type CV Under­

voltage relays.

INTERNAL SCHEMATIC

I• ICATIM c•TM:TOI ---_._..! •nu

FRONT VIEW

187A998 Fig. 12 Internal Schemati c fo r type CV. ( S. P. S. T. ) with

instantan eous indicating vo ltage attachment in type FT- 1 1 case.

I . L . 41 -201 .28

ro ( T1 MER STOP S T I MER WHEN AUX. RELAY STOP CONTACT OPENS)

ro ( Tl MER STARTS T I MER WHEH SWI TCH START "S" CLOSES)

TEST Swl TCH

il'o�

"

-S

"

--A-. C-.-SU_P_P_L __ Y L--------+------------------+�� � 183A024

Fig. 1 1 Di agram of test co nnections for Type CV O ver­voltage relays.

I ID ICATII& CIIIOTM:TOI SWITell

COITAtT PII ITIOM U'-At ·K�IUGIZED Olft'>IILTA··OP'E• UIHI·VILTAII·CLISED

INTERNAL SCHEMATIC VOLTA&£ ADJUSTER: FOR I IV

I MSTAtiTUEtaS IIIDICATIMG VIllAGE

AITAC-IT

ED 'I&IIK.E

TEST ··ITCII

187A994 Fig. 1 3 In ternal Schematic fo r type CV ( D. P . S. T. ) with

in stantan eo us indicating voltage attachm ent in type FT- 1 1 case.

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TYPE CV RELAY

14

----------------

TE�INAL /lftO �UIITI IIG DETAI LS

• 190-32 SCREW

PAIIEL

SPACERS FOR TN Ill PANELS

5 j6 18 SCI!EW ( FOR THICK PANEL USE fr18 STUD)

• 1 90-32 SCI!EW

9 Ts

.. .... _{ 5 !I" -+jL. � l>I A.IJ IIOLES FO"

6 A � v _ I . l90-32 NTG; SCREWS

32 1- ' �

PAIIIEL CUTOUT & DR I LLING FOI! SEMI-FLUSH MTG •

s 1 8

����-1 !..+ 1 .!...-+ 1 ..!.. 32 32 32

�:��c�1��L���.

OI!

CUTOUT FOR

(FI!OIIT V I EW)

9 f& D I A. HOLE

3 - I! [l

TER�1 1 MAL NUMBER

57-D-7900 Fi g. 14 Outline and drilling plan f t or ype C V relays in the type F T- 1 1 case.

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W E S T I N G H O U S E E L E C T R I C C O R P O R A T I O N R E LAY - I N STR U M E N T D I V I S I 0 N N EWA R K , N . J.

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I N S T A L L A TI O N Westinghouse I . L . 41-2D l .2A

• O P E R A T I O N • M A I N TEN A N C E

INSTRUC T I ON S TYPE CV FREQUENCY

COMPENSATED VOLTAGE RELAY

C A U T I O N : Before putting rel ays into service, re­

move all blocking w hich m ay have been inserted for

the p urpo se of securing the parts during shipm ent,

m ake sure that all moving p arts op erate fr eely, in­

spect the contacts to s e e that t he y are cl ean and

op erate the relay to check the s ettings and elec­

trical connectio ns.

A P P L I C A T I O N

The type CV relays are single-p hase induction­

disc type relays operating either on under or over

voltage or both. These rel ays are frequency com­

p e nsated such that their pickup between 30 and 90

cycles is within 5 per c ent o f the 60 cycl e value.

C O N T E N T S

This instruction leaflet applies to the following

typ es of relay s .

CV- 2 1 L o n g Tim e Undervoltage Relay

CV- 2 2 Short Time Undervoltage Relay

CV- 24 Long Time Overvoltage Relay

CV- 25 Short Time O vervoltage Relay

CV- 26 Long Time Over or Und ervoltage Relay

CV- 2 7 Short Time O ver or Undervoltage Relay .

C O N S T R U C T I O N & O P E R A T I O N

* The typ e s CV- 2 1 , CV- 2 2 , CV- 24, CV- 2 5 , CV- 26,

and CV- 27 relays consist of a voltage unit and an

indicating cont actor s witch ( ICS). The comp on ent

parts of the relays are connected as shown in the

internal schematic diagram . Som e styl e relays con­

tain an inst antaneous indicating voltage switch

( IIV) w hich also op erates independ ent of frequency.

A. Vol tage Un i t (CV)

The o vervoltage unit is an "E" typ e laminated

structure with coil s on each leg. The coil on t he

center l e g of the structure is an autotransformer,

SUPERSEDES I . L . 4 1-20 1 . 2 * Denotes change from superseded i ssue.

winding w i t h a tapp ed p rimary. The se condary

winding of the autotransfo rm er is connected to

identical coils on the o uter legs of the "E" typ e

l aminated structure. The coil s are connected in

such a manner that the combination of all the fl uxes

p roduced result in out- o f-phase fl uxes in the air gap. The out- of-phase air gap fluxes produced cause a

contact closing torque.

The undervoltage unit op erates on the same

principle as the overvoltage unit except t he con­

nections to the l eg coils are reversed to cause the

o ut- o f-p hase fl uxes to produce a contact opening

torque.

The units are frequency comp en sated by means

of a resistor located in the outer l e g coil circuit.

The instantan eous trip unit is a s m all a- c oper-

* ated clapp er typ e device. A m agnetic arm atur e , to

w hich leaf-spring mounted cont act s are attached , is

attracted to the magnetic core upon energization of

t he s witch. When t he s witch closes, t he moving con­

tacts bridge two stati onary contacts c ompl eting the

trip circuit. Also during t he operation two fi ngers on

the armature defl ect a spring located on t he front of

the switch w hich allow s the op eration indicator

target to drop. The target is reset from the outside

of the case by a push rod lo cated at the bottom of

the cover.

The adjustable pickup range is accomplished by

m eans of an adj ustable resistor.

C. Indicat ing Contactor Switch ( ICS)

The indicating contactor switch i s a small d-e

op erated clapper typ e d evice. A m agnetic arm ature,

to which leaf- spring mo unted contacts are attached ,

is attracted to the magnetic core upon energization

of the switch. When the switch clo s e s , the moving

contacts bridge two s tationary contacts, compl eting

the trip circuit. Al so , during t his operation t wo

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TYP E CV R ELAY ________________________________________________ _

I I IICATING C ITACTOR SWI TCH

COIITACT POS I T I ON RELAY OE-EMERG IZED OYER·YOLTAG£ - OPEN UIIDER-VOL TAG£-CLOS£0

IIIOUCTION UN I T

INDUCTION UJI I T

LAG CO ILS

RED HANDLE

lEST SWITCH

TERMUIAL

185Al33 Fig. 7 Internal Schematic for the type C V (S. P . S. T. )

voltage relay in the F T- 1 7 case.

fingers on t he armature defl ect a spring l ocated on

front of the switc h , which allows the operation in­

dicator target to drop. The target is reset fro m t he

outside of t he case by a push rod located at the

bottom o f the case.

The front spring , in addition to holding the

target , p ro vides restraint for the armature and thus

controls the pickup value o f the s witch.

C H A R A C T E R I S T I C S * These relays are frequency co mp ensated such t hat

their pickup between 30 and 9 0 cycles is within 5%

of the 60 cycle value.

The CV-2 1 and CV- 22 undervoltage relays, CV- 24

and CV- 25 o vervoltage relay s , and CV- 26 and CV- 27

over or undervoltage rel ays are available in the

voltage ranges:

Range Tap s

5 5- 1 4 0 5 5 6 4 7 0 8 2 93 1 05

1 10- 280 1 10 1 2 8 1 40 1 6 4 1 8 6 2 1 0

A. CV-2 1 and CV-22 Undervo l tage Rel ays CV-24 and CV-25 Overvoltage Rel ays .

1 20 1 40

240 280

Tap value voltage i s the m inimum voltage r e­

quired to just clo s e the relay contact s . A t this

value o f voltage, the moving contacts will leave

the back stop of the time dial and move to clo s e the

2

*

UIOICATING ------.._______ COJITACTOR SWITCH -

Ci»>TACT POS I T IONS ­RELAY DE-ENERG IZED OYER-VOLTAGE - OPEN UNDER-VOLTAGE-CLOSED

ED HANDLE

TEST SWI TC'ft

TERMINAL

185Al34 Fig. 2 Internal Schematic for the type C V (D . P . S. T. )

voltage relay in the F T- 7 7 case.

front contacts. Normal op eration of the two relays

is such that the C V- 2 1 and CV- 2 2 undervoltag e

relays will open its contacts with app lication of

voltages greater than tap v alue voltag e , while the

CV- 24 and CV- 25 overvoltage relay clo ses its con­

tacts with voltages greater than t ap value voltage.

B. CV-26 and CV-27 Over or Undervol tage Relays

Tap value voltage i s the value o f voltage at

which t he stationary front contact clos e s . The

stationary b ack contact will close within 5% of this

value.

When the relay is used as an overvoltage relay ,

t h e moving contact i s m ade w i t h the stationary back

co ntact for values o f applied voltage l es s than tap

value v oltage. Wit h application of voltag e s great ei

t han tap value voltage, the moving c ontact moves t o

close the front cont act i n a t i m e as s hown by the

right hand curve o f either Fig. 8 or 9.

When the relay is used as an undervolt ag e r el ay,

t he moving cont act is m ade with the stationary front

contact for values of app l ied vo ltag e great er than t ap

value voltage. With the application of voltages l e s s

than tap value voltage, the moving contact m o v e s t o

close t h e b ack contact i n a t i m e a s s h o w n on t h e

l eft-hand curves of either fi gures 8 or 9.

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TYPE CV RELAY------------------------------------------------�'�-L�.4�1�-2�01�.2�A

Rat ed T A P S

-

Voltage 1 20 Volt Relay 240 Volt Relay

5 5 1 1 0

64 1 28

7 0 1 40

8 2 1 64 1 20 o r

2 4 0 Volts

93 1 86

1 0 5 2 1 0

1 20 240

1 40 280

* C. In stantaneou s Indi cati ng Vol tage Swi tch (I I V)

*

The range of operation is 1 20 to 200 volts ac. The

pickup is adj usted by means of an adj ustable resis­

tor.

Tri p C i rcu i t

T h e m ain contacts will s afely close 3 0 amp eres

at 250 volts d- e and the seal- in contacts of the

indicating contactor switch will safely carry this

curr ent long enough to trip a circuit breaker.

The indicating cont actor switch has two tap s

that provide a pickup setting of 0 . 2 or 2 amp eres. To

change tap s requires co nnecting the lead lo cated in

fro nt of the tap block to the de sired s etting by means

of a screw co nnection.

Tri p C i rcu i t Constants

Indic ating co ntactor - 0 . 2 Amp . tap 6 . 5 ohms d- e Switch resi stance

0 . 2 Amp . tap 0 . 1 5 o hms d- e

resi stance

E N E R G Y R E Q U I R E M E N T S

The burdens o f the CV-2 1 , CV- 2 2 , CV- 2 4 , CV- 2 5 ,

CV- 2 6 , CV- 2 7 relays at rated voltage are a s follows

The b urden of the 1 1 V ( when used) is in addition

to the above burdens and is as follow s :

setting - ----

1 20 Volts

200 Volts

Voltage App lied -- -- ----

1 20 Volts

200 Volts

Burden

2 . 0 VA.

3 . 0 VA.

Power Volt-Amp s . Watts

F actor

1 4 . 3 8 . 44 6. 3

1 0 . 3 8 . 4 1 4 . 23

8 . 3 5 . 3 9 3 . 26

6 . 00 . 3 7 2 . 23

4 . 6 6 . 35 1 . 63

3 . 64 . 34 1 . 25

2 . 7 7 . 3 3 . 9 2

2 . 0 4 . 3 1 . 63

S E T T I N G S

A. CV Un i t

T h e setting o f t h e CV unit can b e defined either

by tap setting and time dial po sition or by tap set­

ting and a specific time of op eration at some p er­

centage of tap value voltage ( e . g. o n CV- 24 1 20 tap

settin g , 2 time dial po sition or 1 20 tap setting, 1 2

seconds at 1 40 per cent o f tap value voltage ) .

T o p rovide sel ective circuit breaker op eration ,

a minimum coordinating time o f 0 . 3 seconds plus

circuit breaker time is r ecommended b etween the

relay b eing set and the relays with w hich coordina­

tion i s to be effected.

The connector screw on the terminal plate above

the time dial connects v arious turns of t he operating

coil. By placing t his screw in the various terminal

plate holes , the relay will just close its co ntacts at

the corresponding voltage of 5 5- 64- 7 0- 8 2- 9 3- 1 0 5- 1 20-

1 50 volts or as marked on the terminal plat e .

T he nylon screw o n the terminal plate holds the

tap plate in po sition when tap s are being c hanged.

To use the po sition o n the terminal plate in which

the nylon screw is used, remove the nylon screw and

place it in one of the unused holes. T hen remo ve the

tap screw and insert it in the terminal plate hol e .

I n stantaneous Rec los ing

T he factory adj ustment of the volt age unit con­

tacts provides a contact follow. Where circuit break­

er reclosing will be i nitiated immediately after a

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TYP E CV R ELAY ______________________________________________ ___

LEFT HAND CONTACT ( FRONT V I EW )

/ R I GHT HAJID CONTACT (FROMT YlfW)

IMDICATIIG COIHACTOR SWITCH

INTERNAL SCHEMATIC

ED HAIIDLE

TEST SWI TCH

TERMIIIAL

185Al35 Fig. 3 Intern a l Schematic for the type CV (S. P. D. T. )

voltage relay in the F T- 1 1 case.

trip by the o vervoltage contact , the time of the

op ening of the contacts should be a minimum. This

condition is obtained by loos ening the s tationary

contact mounting scr e w , removi n g the contact pl ate

and then r eplacing the plate with the bent end rest­

ing against the co ntact spring.

For double trip relay s , the upper statio nary con­

tact is adj usted such that the contact rests solidly

against the b ack stop . The lower stationary con­

tact is then adjusted such that both stationary con­

tacts m ak e contact sim ultaneously with their res­

pective moving cont act.

* B . In stantaneous Ind icat ing Voltage Switch ( I IV)

T h e adj ustabl e resistor m ust be adj usted for t h e

desired pickup voltag e .

C. I nd i cat ing Contactor Switc:� ( IC�

Only one setting i s required on the res unit;

that i s , the sel ection of the 0 . 2 to 2 . 0 amp ere tap

setting. This s el ection is m ad e by connecting the

l e ad located in front o f the tap block to the desired

setting by m eans of the connecting screw.

I N S T A L L A T I O N

The relays should be mo unted on switchboard

panels or their equivalent in a lo cation free from

dirt , moistur e , excessive vibration, and heat . Mount

4

the relay vertically by means o f the four mounting

holes on the flange for semi-flush mo unting or by

m eans o f the r e ar mo unting stud o r studs for pro­

j ection mountin g . Either a mounting s tud or the

mo unting screws m ay be utilized for grounding the

relay. The electrical connections may be m ade dir­

ectly to the terminal s by means o f screws for steel

panel mo unting or to the terminal studs furnished

with the relay for thick panel mounting . The ter­

minal studs may be e asily removed or ins erted by

locking two nuts on the stud and then turning the

the proper nut with a wrench.

For detailed FT Case information refer to I . L .

4 1- 0 7 6 .

A D J U S T M E N T S & M A I N T E N A N C E

The proper adj ustments to i nsure correct opera­

tion o f this relay h ave b een m ade at the factory.

Upon receipt o f the relay, no customer adjustment s ,

other than tho s e covered under "Settin g s , " should

be required.

Acceptance Check

The following c heck is recomm ended to insure

that the relay i s in prop er working o rder:

A. CV Un i t

1 . Contact

The index m ark on t he movement frame will

coincide with the "0" mark on the time dial

when the stationary contact has moved

through approximately one h alf of its normal

deflection. Therefore , w ith the stationary

contact re sting agai nst the back stop , the

index m ark is offset to the right of the "0" mark by approximately . 0 2 0 " . (For t h e typ e

CV- 2 6 and CV- 27 rel ays the b ack cont act has

no follow when the front contact is thro u gh

one-half of its follow). The p l acem ent of the

various time dial po sitio ns in line with the

index m ark will give op erating times as

s ho wn on the r e sp ective time- c urrent curves.

For double trip relay s , the follow o n the

stationary contacts s ho uld be approximately

1 / 3 2 " .

2 . Minimum Trip Voltage - s e t t h e time dial to

po sition 6. Alternately apply tap value volt­

age plus 3% and tap value voltage minus 3%.

a. CV-24 and CV- 25 Ov ervoltage Rel ays ,

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TYPE CV R ELAY----------------------------------------------------��·�L .�4�1 -�20�1�.2A

CV- 2 6 and CV- 27 Over or Undervoltage

Relays - The m oving c ontact should

l e av e the back stop at tap value voltage

plus 3% and should return t o the back­

stop at tap value voltage minus 3%

b. CV- 2 1 and CV- 2 2 Undervoltage Relays -

The moving cont act s ho uld leave t he

b ack stop at t ap value voltage minus 3%

and should return to the b ackstop at tap

value voltage plus 3%.

* 3. In stantaneous Indicating Voltage Switch (11V) ­Apply de sired pi ckup voltage and adj ust the

internal adj ustable resi stor until the con­

tacts j ust m ake. The t arget s hould drop

freely.

4 . Indic ating Contactor Switch ( ICS) - Clo se

the m ain relay c ontacts and p ass sufficient

d-e current t hrough the trip circuit to close

the contacts o f t he res . This v alue of cur­

rent should be not gr eater t han the particular

ICS tap setting being used. The op eration

indicator target should drop freely.

The contact gap should be approximately

. 047" b etween the bridging moving co ntact

and the adjustable stationary contacts. The

bridging moving could touch both stationary

contact s simultaneously.

Routing Maintenance

All relays should b e inspected periodically

and the time of op eration should be checked at

least once every year or at such other time interval s

a s may b e dictated by e xperience to be suitable to

the particular application. T he use of phantom load s,

in testing induction- typ e relay s , should b e avoided ,

since t h e resulting di storted current wave form will

produce an error in timing.

All contacts should be p eriodically cleaned. A

contact burnisher # 1 82A836H0 1 i s recomm ended for

this purp o s e . The use of abrasive material for clean­

ing contacts i s not recommended, b ecause of the

danger of embedding s mall p articl es in the face of

the soft filver and thu s , impairing the contact.

Cal ibration

U s e the following procedure for calibrating the

relay if t he relay has been taken apart for rep airs ,

or the adjustm ents have been distrubed. This proce­

dure should not be used until it is app arent that the

relay is not in proper working order (See "Accept­

anc e check " )

A. CV Un i t

1 . Contact

The index m ark on the movement frame will

coincide with the " 0 " m ark on the time dial

when the stationary contact h as moved

through approximately one h alf of its norm al

deflection. Therefore , with the stationary

contact resting against the b ackstop, the

index mark is offs et to the right of the " 0 " m ark by approximately . 0 20 " . ( F o r t h e type

cv- 26 and cv- 27 relays t h e b ack contact has

no follow w hen t he front contact is t hrough

o ne- half of its follow). T he placement of the

various time dial po sitions in line with the

index m ark will give operating times as

s hown on the respective time- current curves.

For double trip r elays, the follow on the

stationary contacts s hould b e approximately

1 / 3 2 " .

2 . Minimum Trip Voltage

The adjustment o f t he spring tension in

setting the minimum trip voltage v alue of the

relay is most conveniently made with the

damping m agnet removed .

Set the relay o n the minimum tap s etting.

Adjust the spring s uch that the s ame voltage

is required to j ust move the contact from the

back stop of the time dial to the Vz and 1 0%

position.

Set the relay on the 6 time po sitio n .

a. CV- 24 and CV- 25 Overvoltage, CV- 26

and cv- 27 Over or Undervoltage - Adjust

the r esistor in t he rear so that the moving

contact will l eave the b ack stop of the

time dial at t ap value v oltage + 1 . 0% and

will return to the backstop at tap value

voltage - 1 . 0%.

b. CV- 2 1 and CV- 2 2 Undervoltage Relays -

Adjust the resistor in the rear so that the

moving contact will leave the backstop of

the time dial at tap value voltage - 1 . 0%

and will return to the b ackstop at tap

value voltage + 1 . 0%.

3 . Install the perman ent m agnet.

a . CV- 2 1 and CV- 2 2 Undervoltage Relay -

U s e designated test circuit . With switch

"S" opened, adjust resistor " A " until

voltmeter reads tap value voltage or

higher . Close s witch " S " and adjust

re sistor "B" until the voltmeter read s

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TYPE CV RELAY ________________________________________________ _

6

T A B L E I

Typ e P ercent Tap

Relay Value Voltage Or

P i ck up Voltage

C V 2 1 50

CV- 22 50

CV- 24 140

CV- 25 140

CV- 26 140

CV- 27 1 4 0

40 p er c e n t o f t ap value voltage. Open

s witch "S" and allow the moving contact

to move to the back stop of the time di al .

Clo s e switch "S " and m easure op erating

time.

Adju st the p er m anent m agnet gap until

the operatin g time correspond s to the

value given in table 1 .

b . CV- 24 and CV- 25 Overvoltage Relay -

Apply the i ndicated voltage of table 1 and

measure the operating tim e . Adj ust the

p ermanent m agnet k e eper until the operat­

ing time corresponds to the value given in

table 1 .

c . CV- 26 and CV- 27 Over o r Undervolt age

Relay - Apply the i ndicated voltage of

table 1 and m easure the operating ti m e .

Adj ust the permanent m agnet keeper until

t he operating time corr e sponds to the

value given in table 1 .

Measure the reset time of the disc fro m

t h e stationary front contact t o the station­

ary b ack cont act. This time should be as

shown in table 1 .

Time Operating Reset Dial Time Time

Setting in Sec. in Sec.

6 68

6 8 . 6

6 3 7 . 5

6 6 . 8

6 3 3 3 2 . 5

6 * : 5 . 9 * 5 . 7

* B . I n stantaneous Ind i cati ng Vol tage Swi tch ( I IV )

T h e cont act gap should be 3 / 3 2 ± 1 / 64 between

the bridging contact and the adj ustable stationary

contacts. The bridging moving co ntact should touch

bo th stationery contacts s imultane ously. When the

arm ature is fully picked up there s hould b e some

wipe of the contact s.

The core s crew should b e all the way i n prior to

setting the pickup . Apply desired pickup voltage

and adjust the adj ustabl e resi stor until the c o ntacts

just mak e . The target should drop at t he same time.

C. Ind i cati ng Contactor Switch - Unit ( ICS)

Clo se the m ain relay contacts and pass suf­

fi cient d- e current through the trip circuit to close

the contacts of the res. This value of current should

not b e greater than the particular res setting being

used. The indicator target should drop fr eely.

R E N E W A L P A R T S

Rep air work can b e done most satisfactorily at

the factory. However, i nt erchan g eabl e parts can b e

furnished to t h e customers w h o a r e equipped for

doing repair work . When o rdering parts , al ways give

the complete name data.

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TYPE CV R ELAY --------------------------------------------------�I . L�·-4_1 -�20_l .�2A

I

11 1 11 1 11 11 I I I I I � TYP I CAl T t M£ CURVES � - TYPl CY � f-- UNDER VOlTAGE RELAY r- 60 CYCL ES f--

v T I ME

0

O I ·AL SEll i N (

10

_I I I I 1 1..,.. ....

"'

_ ... 1 0 .. g

....

...

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20

!." ""

� ,. �

8�

7 ...

...

... l..o

I,..

30 ltO

1..1'

/

6

,.

l..o

P ER CENT TAP

J

1.1' ljl 1/ WI' 1/ I�

[/

[,I

1/ � ., "

' � 5

�... ll ""

J...,. j,.o

"""

loool-'

50 VAL U E

r1 r 1 160

1 50

1 II 1 rT 1 ll0

I rT if 1 30

IJ II II l I I 1 20

7 II if 1 10 I ' II rT II

'T rJ rT IT 100

if IT go

/ J 7 IT I II) 0 80 �

IT rT <.,) , 1&1 1/ (J)

IT 70 � i

V' ., � I J , / 60

7' 'T 50

3 ljl lW """ r1

2 l J...,. IJ 30

J.,.. 1 20 J,;;;ii

,_, j,.o l/2 � ""' 1 0 '-""" L-0

60 70 80 go 1 00 VOLTAGE Curve

Fig. 4 Typical 60- cycle time curves or the type CV- 2 1 Long Time Undervoltage R elay.

'

418251

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TYPE CV R ELAY-------------------------

0

8

TY, I CAL T I ME CURVES

TYPE CY UNDER VOL TAGE REl AY

60 CYCL ES

'

.

II ILLl

II J

lL

llll II '# II

lL l1 11 11 II

II II J _1 ll_

II II II II I J If , If II II � L1 11 IJ v

1,; v lL u JL lL T l tot D IAL SETTIN G

,.,. � I..- , u I J..oo � IJ II I J II I

J..loo l l ,.. " J...- L..l !I I � v 1.' v II loorr"' 10 """ " l...- v L1 looo 9 ....

�-� 8 ... " J � 7 .,... 'I .... . 6 " 'L ll """ � .... ""' l..or 5 " II �-� � ""' IL ""' lJ � IL

""" 3 , � ,., . 2 io"" � 1

'r!JI� . I I

_l j_ I

10 20 30 lJO 50 60 70 80

P E R CEN t TAP VAL U E VOL TAGE

lJ

I I '1

I .

II ,

�

90

32

30

28

26

216

22

20

18

en

1 6 � 0

t lJ

1 2

10

8

0

2

0 1 00

u � en

Curv-e 418250 Fig. 5 Typical 60- cycle Time curves of the type C V- 22 Short Time Unclervoltage R elay.

""""""""

l!!l!fi�;JI'f�

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! :

TYP E C V RELAY ____________________________________________________ I . L_. _4 1_·2_o_L_2A

1 60

1 �0

1 140

130

120

1 10

1 0 0

90 VI a z 80 8 .... VI

70

60

50

140

30

20

10

0 0

B

7

6

� 14

3

2 IS

1 <;[ 9;�

110 120 130 1 140

9

TYP I CA L T I ME C U R V ES

TYPE C �

OVER VOL TAGE R E L AY

60 CYCL ES

.

1 1 T IME O I A L SETT I N G

10

.

1 50 1 60 1 70 180 1 90 200 210 220 230 2140 2�0 P E R C E N T OF TAP V A L U E VOL TAGE

4o6c881 Fig. 6 Typical 60- cycle time curves of the type CV- 24 Long Time Overvoltage Relay.

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-0

::!) '!l ...... -1 "< 1J n 2.. 0\ c;:> n "< n j) ... 3" ID n c: ., '( ID Ill 0 ..... ... :I" ID � ID () -::=: "' tl1 "' :I" 0 :::. -1 3" ID 0 '( ID ., '( 0 Q IQ ID ::0 � c ;<

)

1'6"

i )15

Jll I

li i

12 !

u I �· tO' i

<n Q � 8 ... <n ., i

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3 ' 1!

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0

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2

1

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I IV\ 1 t n t '> n t '!>n l im

T I ME D I AL SETT I H 11

10

II 8

7 6

!l

ll'in t An 170 IRQ IQO 200 2 10 220 PER CENT TAP VALUE VOLTA(iE

) ,.#'

TYP I

OV£11

230 2l&O 2!50 260 70

CAL T I M£ CURVES

TYI'£ CV

VOLTAii£ RELAY

60 CYCL£S

210 HO 304 4o6c884

)

-t -< -o m n < ;;o m r > -<

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., �-co

..... '< , n !!... 0.. � n '< !!. ID ... 3" ID n c: ., < ID .. 0 .... ;. ID � , ID I") ..;: t... 0.. r-0 :I IQ -t I 3" ID f l Q :I a.. I c: :I a.. ID �

f l "' ID Q �

--

II I I I·�· 1 1 1 1 1 1 I 1 1 1H1TI I I I I I IM1 1 1 1 1 e

1 1 1 1 1 1 1 1 1 1 1 1 tmrnmftiDUHl� . 3

I I I I I I fll I I I I I I I I I I I I I I U I'Offl I I I I I I l 2

II l l l l l l l l l l l l l l l l l l l l l l l l l l ll l l l l l l l l l l :'121 0 10 20 ao 110 !SO 60 70 eo so

I �

i 1 110

I! 130

m 120

m 1 10

m 100

I V) 0 3Hao ... V) ..-W-J 70

�0

0

10

Jo

3

2

/2

II

6 �

7

11 10 Q

8

T I ME D I A L SETT I N

TY P I CAL T I ME CURY£5 TYPE CY

OYER AND UNDER VOLTA&£ RELAY

00 CYCLES

100 1 10 120 130 1 110 1!10 l&p 170 180 ISO 200 210 220 230 2110 2!10 P E R CEtH TAP VALUE VOLTAGE

4o6c882

-i -< '"'IJ m n < :::0 m r > -<

r ""' ;, 0 ..., >

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-N

"11 '!l '() ..... "< "'J n 2.. a.. ? n "< n iD ... i f1) n !; < f1) Ill 0 ..... ... ::r-11)

� f1) (') -:::: N � "' ::r-0 :::. ..... 3" f1) 0 < � § 0.. c: " � .. < � Q IQ f1) :::0 f1) Q ':"

10 20 30 �0 �0 60 70

)

I �

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1/2� l

1112 I I I II I II II I II if I II I I I I I BO go 100 1 10 120 130 1�0 1 �0 160 170 180 190 200 210 220 230

PER CENT OF UP VALUE VOlTAGE

) 11'

TYPI CAL T l NE CUR YES

TYPE CY

OYER AIID UNDU YOL UGE RELAY 80 CYCLES

2� 280 260 270 2BO 2go 3oo

4o6c883

)

-f -< "tt m n < :::0 m r )>--<

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*

TYPE CV R ELAY J . L . 41 -2D1 .2A ------------------------------------------------------���

• TO ( T I MER STOPS I T i MER WHEH AUX, RElAY STOP CONTACT OPEN S )

' TO ( T I MER STARTS \ T I MER WHEN SWI TCH

) START "S" CLOSES )

A. C. SUPPLY 183A023

Fig. 10 Di agram of test connections for Type CV Un der­voltage relays.

INTERNAL SCHEMATIC

I., ICATIM ctiTACT. ----4->o./ •• Tell

FRONT VIEW

187A998 Fig. 12 Internal Schemati c fo r type CV. (S. P . S. T. ) with

in stantan eou s indi eating voltage attachment in type FT- 1 1 case.

*

ro ( Tl MER STOPS TI MER WHEH AUX, RELAY STOP CONTACT OPENS)

ro ( TIMER STARTS TIMER •HEH SWI TCH START "S" CLOSES)

TEST SWI TCri

�--------�-----------------4---o i:::�-· s_" __ A_.-c.--su-P-PL_Y_

183A024 Fig. 1 1 Diagram of test connections for Type CV O ver­

voltage relays.

I.ICATIII COIITKTOI SWITCII

COITACT ,.JTIOIII 11"' ·n•nuaozto 0111-IILTA··OPEI UIHI-WOLTAGI·CLISED

INTERNAL SCHEMATIC

IIISTANTAIEtiiS IJIDICATJIG VIllA&£ AITAC-IT

187A994 Fig. 1 3 Internal Schemati c fo r type C V (D. P . S. T. ) with

in stantan eo us indi cating voltage attachment in type F T- 1 1 case.

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TYPE CV R ELAY

14

--------

- I • ....

-f

�II

6 1 1 I I 6 i

�·

PANEL LOCATI 011 SEMI-FLUSH MTG· PROJECTION MTG.------_j

PANEL

SPACERS FOil THIN PAIIELS

5 j6 1 8 SCI!EW ( FOI! THICK PANEL USE L 1 s STUD) 1 6 . 1 90-32 SCitEW

9 Ts

3 'i 0 1 1 .. 1 0 HOLES 01! CUT OUT TERM INAL AIID MOUNTI NG DETA I LS

I -r 5 ! 1 r 'i .DI A.II MOLES FOR

7 �1- .f }'_ . 1 .... 32 MTG; SC"W!

+ t -I.,..

PANEL CUTOUT & DR I LLI•G FOR SEMI-FLUSH MTG.

�:��C��b�L��g,o�t

CUTOUT FOI!

( FRONT V I EW)

s l 8 3 - I! �

TE""' INAL NUMBER

57-D-7900 Fig. 14 O ut/ in e ancl cl ·tt · I rr rng p an for type CV I . re ays rn the type F T- 1 1 case.

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W E S T I N G H O U S E E L E C T R I C C O R P O R A T I O N R E LAY- I N ST R U M E N T D I VI S I O N N EWA R K , N . J.

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Westinghouse I . L. 41 -20 1 G INSTALLATION • OPERATION • MAINTENANCE

INSTRUCTIONS TYPE CV VOLTAGE RELAY

C AU T I O N Before putting relays into service , remove all blocking which may have been inserted for the pur­pose of securing the parts during shipment , make sure that all moving parts operate freely, inspect the con­tacts to see that they are clean and close properly, and operate the relay to check the settings and electrical connections.

APP LICATI ON

The type CV relays are single-phase induction­disc type relays operating either on under or over voltage or both. These relays are applied as a volt­age fault detector operating in conjunction with other protective relays. The relays are also used as timing devices for various automatic operations.

CONTENTS

This instruction leaflet applies to the following types of relays:

CV- 1 Long Time Undervoltage Relay CV-2 Short Time Undervoltage Relay CV-4 Long Till'e Overvoltage Relay CV-5 Short Time Overvoltage Relay CV-6 Long Time Over or Undervoltage Relay CV-7 Short Time Over or Under voltage Relay CV-8 Low Voltage Pickup Overvoltage Relay

CONSTR UCTION AND OPERATION

The types CV- 1 . CV-2, CV-4, CV-5, CV-6, and CV-7 relays consist of a voltage unit and an indicating contactor switch (ICS). The principal component parts of the relay and their loc ation are shown in figures 1 , 2, and 3.

The type CV-8 relay in addition to the above com­ponents also has a capacitor which is series tuned with the main coil of the electromagnet. This tuned circuit offers a low impedanc e to fundamental current and a high impedance to third harmonic currents. Hence, the relay has a low pick up value for funda­mental voltage and a much higher value of pickup for third harmonic voltage. At rated voltage the electro­magnet is saturated causing the circuit to be detuned. The impedance of the circuit is increased and limits the fundamental current to a safe value.

SUP ERSEDES I. L. 20 1 F *Denotes change from superseded i ssue.

A. Voltage Unit (CV) The overvoltage unit operates on the induction­

di sc principle. A main tapped coil located on the center leg of an "E" type laminated structure produces a flux which divides and returns tlrough the outer legs. A shading coil causes the flux through the left leg (front view) to lag the main pole flux. The out-of­phase fluxes thus produced in the air gap causes a contact closing torque.

The undervoltage unit operates on the same prin­ciple as the overvoltage unit except the shading coil is on the right leg (front view). This causes the out-of-phase fluxes to produce a contact opening torque.

B. Indicating Contactor Switch (ICS)

The indicating contact6r switch is a small d-e operated clapper type device. A magnetic armature, to which leaf-gpring mounted contacts are attached, is attracted to the magnetic core upon energization of the switch. When the switch closes, the moving con­tacts bridge two stationary contacts, completing the trip circuit. Also , during this operation two fingers on the armature deflect a spring located on the front of the swi tch, which allows the operation indicator target to drop. The target is reset from the outside of the case by a push rod located at the bottom of the case.

The front spring, in addition to holding the target, provides restraint for the armature and thus controls the pickup value of the switch.

CHARACTERISTICS

The low pickup CV-8 Overvoltage Relay is avail­able with the following continuous voltages.

67 volts 199 volts

* The minimum voltage required to just close the

CV-8 contacts is 8% of the continuous voltage. Typi­

cal operating times of the type CV-8 relay are shown

on figure 8. An adjustable 5 . 4 to 20 volt relay with

a 67 volt continuous and a 1 6 to 40 volt relay with a

continuous of 199 volts is al so available.

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TYPE CV RELAYS

1

Fig. 1. Type CV-2 Relay Without Case. 1-Voltage Unit (CV). 2-lndicating Contactor Switch (ICS). 3-lndicating Contactor

Switch Tap B lo ck.

2

3

5

6

4

Fig. 2. Voltage Unit (CV). 1- Tap Block. 2- Time Dial. 3- Control Spring A ssembly. 4-Disc. 5-Stationary Contact A ssembly. 6-Permanent Magnet.

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TYPECVRELAYS __________________________________________________________ �I . L�-�4�1 -�20�1 G

··�

-�f. ""''\ , ,, , ,

Fig. 3. Indicating Contactor Switch (ICS).

The CV- 1 and CV-2 Und�rvoltage Relays, CV-4 and CV-5 Overvoltage R elays, and CV-6 and CV- 7

Over or Undervoltage Relays are available in the following voltage ranges:

R a nge

55• 140 55 64 1 10-280 1 10 128

T o p s

70 82 140 164

93 1 05 186 210

120 140 240 280

A. CV-1 and CV-2 Undervoltage Relays -- CV-4 and CV-5. Overvoltage Relays

Tap value voltage is the minimum voltage re­quired to just close the relay contacts. At this value of voltage, the moving contacts will leave the back­stop of the time dial and move to close the front contacts. Normal operation of the two relays is such that the CV-1 and CV-2 undervoltage relays will open its contacts with application of voltages greater than tap value voltage, while the CV-4 and CV-5 overvolt­age relay closes its contacts with voltages greater than tap value voltage. Thus , the oper;:U;ing curves of figures 9 and 10 of the undervoltage relays apply when the voltage is originally higher than tap value voltage an d is suddenly reduc ed to a value shown on the curves. The operating curves of figures 1 1 and 12 of the overvoltage relays apply when the voltage is initially below tap value voltage and is suddenly raised to a value shown on the curves.

B. CV-6 and CV -7 Over or Undervoltage Relays

Tap value voltage is the value of voltage at which the stationary frort contact closes. The stationary back cortact will close within 5% of this value .

When the relay is 1Jsed as an overvoltage relay, the moving contact is made with the stationary back cortact for vallles of applied voltage less than tap

value voltage. With ap plication of voltages greater than tap value voltage, the moving contact moves to close the front contact in a time as show n by the right-hand curves of either figures 13 or 14.

When the relay is used as an undervoltage relay, the moving contact is ma de with the stationary front cortact for value s of applied voltage greater than tap value voltage. With the application of voltages les s than tap value voltage, the moving contact moves to close the back contact in a time as shown on the le ft-hand curves of either figures 13 or 14.

Trip Circuit

The main contacts will safely close 30 amperes at 250 volts d-e and the seal-in contacts of the indi­cating contactor switch will safely carry this current long enough to trip a circuit breaker.

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TYPECVRELAYS. ________________________________________________________ �

IIIOitATIIHo t•TACTOI SWITCH

fiiOIIT Ylh

RED IIAIIOLE

TEST SWITCM

TffiMIUl

1 82A72 5

Fig. 4. Internal Schematic of the Double Trip Type CV Un· der or Overvoltage Relays In Type FT l l Cas•. For the Single Trip Relays the Circuits Associated with T ermlnal 2 are Omitted.

The indicating contactor switch has two taps thll.t provide a pickup setting of 0. 2 or 2 amperes. To change taps req uires connecting the lead located in front of the tap block to the desired setting by means of a screw connection.

Trip Circuit Constants

Indicating contactor - 0 . 2 amp. tap 6 .5 ohms d-e switch resistance

2 . 0 amp. tap 0. 15 ohms d-e resistance

E NERGY REQU I REMENTS

The burdens of the CV- 1 , CV-2, CV-4, CV-5, CV-6, CV-7 relays at rated voltage are as follows:

R ated6 T a ps V o lt· P ow e r 120 Volt 240 Volt Amps. F a ctor

V olt a g e Relay Relay

55 1 10 64 128

120 or 70 140 82 164

240 Volts 93 1 86 105 210 1 20 240 140 280

10.0 . 38 7 . 0 . 3 5 5 .8 .34 4 . 0 . 3 3 3 . 1 . 3 1 2.4 . 29 1 . 8 . 28 1 . 3 . 26

Watts

3 . 8 2 . 5 2 .0 1 .3 1 .0

.7

. 5

. 3

6These relays will continuously stand either 110% of rated voltage or tap value voltage , whichever is higher.

4

IIIDICATIAil tOITACTOI SWITtM

FIIOIIT YIIV

Ell SWITCI

1 82A727

Fig. 5. Internal Schematic ol the type CV Over or Under­voltage Relay in Type FT l l case.

The burdens of the CV-8 relays at continuous voltage are as follows:

C o nt i n u o us Volt a g e

199 67

* Rang e

5 . 4 to 2 0 V

1 6 t o 4 0 V

A. CV Unit

V olt Amps.

30 30

P ower F actor

.342

. 342

SETTINGS Sett i n g A p pl i e d Volta g e

5 . 4 67

20 67 16 1 99 4 0 1 99

Watts

10 10

V A

30

1 5 30 20

The setting of the CV unit can be defined either by tap setting and time dial position or by tap setting and a spe c ific time of operation at some percentage of tap value voltage (e.g. on CV-4 120 tap setting, 2 time dial position or 120 tap setting, 12 seconds at 140 percent of tap value voltage).

To provide selective circuit breaker operation, a minimum coordinating time of 0.3 seconds plus circuit breaker time is recommended between the relay being set and the relays with which coordination is to be effected.

The connector screw on the terminal plate above the time dial connects various .turns of the operating coil . By placing this screw in the various terminal plate holes, the relay will just close its contacts at �, the corresponding voltage of 55-64-7Q-82-93- 105- 120-140 volts or as marked on the terminal plat e .

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TYPECV RELAYS----------------------------------------------------------��·=L�.4�1�-2�0l�G

IIIICATIII CIITAC'III ., Tal

fDT Willi

1 82A726

F ig. 6. Internal Schematic of the type CVB 1 99 volt relay In type FTJ J case,

tNTIItfiiAL ICHIIIIAT C

IIDUCTIOI lilT

IUI ITOI

CAPAG ITOI

llD IAIOLl TliT IWITCII

TliMIIAL

1 88A307

IIIICATIII CIITACTII WITCA

fDT Willi

1 82A743

Fig. 7. Internal Schematic of the type CVB 67 volt relay In type FT2 J case.

IIDICATIIHI

COITACTOI SWITCM

INTIItNAL SCHt:IIIAnC

I IDUCTIOI UIIT

lED IIAIDLE

- TEST SWI TCI1

TERMUIAL

1 85A038

* Fig. 8. lnte1n al Schematic o f the type CV 1 99 volt relay in * Fig. 9. Internal Schematic of the type CVB 67 volt relay in type F T 1 1 case with adjustable p i ckup. type F T2 1 case with adjustable p i ckup.

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TYPE CV R ELAYS __________________________________________________________ __

The nylon scre w on the terminal plate holds the tap plate in pos ition when taps are be ing changed. To

use the position on the terminal plate in which the nylon screw is used, remove the nylon screw and place it in one of the unused holes. Then remove the tap screw and insert it in the terminal plate hole,

Instantaneous Reclosing

The factory adjustment of th e voltage unit con­t acts p ro vides a contact foll o w. Where circuit breaker reclosing will be initiated imme di ately after a trip by th e over voltage contact . the time of the opening o f the contacts should b e a minimum . This condition i s obtained by loosening th e stationary contact mounting screw, removing the contact pl ate an d th en replacing th e plate with th e b ent en d resti n g against th e contact spring.

For double trip relays , the upper stationary con­tact is adjusted such that the contact rests solidly against the back stop . The lower stationary contact is then adjusted s uch that both stationary contacts make contact simultaneously with their respective moving contact .

B. Indicating Contactor Switch ( ICS)

No setting is required on the ICS unit except the selection of the 0 . 2 to 2 . 0 ampere tap setting. Thi s selection is made by connecting the lead located in front of the tap block to the desired setting by means of the conne cting scre w .

INSTAL LAT ION

The relay s should be mounted on switchboard panels or their equivalent in a location free from dirt, moisture, excessi ve vibration , and heat. Mount the relay vertically by means of the four mounting holes on the flange for semi-flush mounting or by means of the rear mounting stud or studs for proj ection mount­ing. Either a mounting stud or the mounting screws may be utilized for grounding the relay. The elec­trical connections may be made directly to the ter­w inals by means of screws for steel panel mounting or to the terminal studs furnished with the relay for thic k p an el mounting. The terminal stud s may be easily removed or inserted by locking two nuts on the stud and then turning the proper nut with a wrench.

For d etailed FT Case information refer to I .L. 4 1-076.

ADJUSTMENTS AND MAINT ENANCE

The proper adjustments to insure correct operation of this relay have been made at the factory. Upon receipt of the relay, no customer adj ustment s, other than those co vered und er "Settings", should be required .

Acceptance Check

The following check is recommended to insure that the relay is in proper working order:

6

A. CV Unit

1 . Contact

a) BY turnin g th e time dial , mo ve the moving contacts

until they d e fl ect th e stationary contact to a posi­

tion where the stationary contact is resting against

its backsto p . The index· mark located on the move­

ment frame shoul d coincide with the "0" wark on

the time di al . For doub l e trip relays, the foll ow o n

the stationary contacts shoul d be approximately

1/64" .

b) For relays identifi ed with a "T" , lo cated at lower

left of stationary cont act block , the inde x mark on

the movem ent fram e will coincide with the "0" mark on the time dial when the stationary contact

has move d through approximately one hal f o f its

normal defl ection. There fore , with the station ary

contact resting against th e backsto p , th e index

mart< i s off set to the right of the "0" mark by ap­

pro xim ately .0 20 " . (For th e typ e CV- 6 and CV-7

relays the back contact has no follo w wh en th e

front contact is through one-half of its follow). The

placem ent of th e various time dial p o sition s in line

with the index mark will give operatin g times as

shown on th e respecti ve time- current curves. For

doubl e trip relays, the follow on the stationary con­

tacts should be appro ximately 1/3 2".

2. Minimum Trip Voltage - Set the time dial to position 6. Alternately apply tap val ue voltage pl us 3% and tap value voltage minus 3%.

a. CV-4 and CV-5 Overvoltage Rela,ys, CV-6 and CV-7 Over or Und ervoltage Relays - The moving cont act should leave the backstop at tap val ue ·volt­age plus 3% and should return to the backstop at tap value voltage minus 3%.

b. CV- 1 and CV-2 Undervoltage Relay s - The moving cont act should leave the backstop at tap value voltage minus 3% and should return to the back­stop at tap value voltage plus 3%.

c. CV-8 Overvoltage Relays - The moving contact should leave the backstop at 8.5% of contin­uous voltage.

3. Time Curve - Table 1 shows the time curve calibration points for the various types of relays. With the time dial set to the indicated position, apply the voltages specified in table 1 ( e . g. for the CV-4, 140 percent of tap value voltage) and measure the ope rating time of the relay. The operating time should equal those of table 1 plus or minus 5%.

B . Indicating Contactor Switch (ICS) - Close the main relay contacts and pass sufficient d-e current through the trip circuit to close the contacts of the ICS. This value of current should not be gr eat er than the p articular ICS setting being used. The indi­cator target should drop freely.

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TYPECVRELAYS __________________________________________________________ �,·�L�. 4�1�-2�0�1 G

(/) a

16

14

12

1 0

�8 u Uol (/)

6

2

0 0

TIME

1 1

10

8 9 ·I-r-o ·

7 6

5 �

3 2

1 112

�00 800 1200

P ER CEN T P I CK-UP VOLTAGE

TYPICAL TIME CURVES TYPE CV-8

OVER VOLTAGE RELAY 60 CYCLES

DIAL SETTING

1 600

Curve 41 82 52

Fig. 10. T yp ical 60-cycle time c urves of the type CVB Low P ickup Overvoltage Relay.

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TYPECVRELAYS __________________________________________________________ __

0

8

I I I I I 11 1-1- TYP I CAl T t M£ CURVES - TYPl CY- 1 1/ ,_ � VNOER VOLTAGE RELAY I-

80 CYCL ES IJ 1- J

II II

II II

'J v

IJ v 1/ II

II' IJ 1/ II [.,; T I ME D I AL SETT I N (

.....

.....

1 0

I I I I 1 1 "'1 ,.... 1-- 1 0 .

.... -

20

1..,1 V' � v J [.,; � J 1/ II g !..-II" ,..,. v

a " v "" v 1/ v

7 ""' I'

6 .... ,.. � ,... _ ll L,..o � f-"'

3

1-- 2 ..... ,

..... j,..l""'

""' """"' i""'

30 1+0 50 60 70 PER CENT TAP VAL UE VOL TAGE

r

_l lL

l1 IL

lL II

1 1 I

IJ _j II I II II

II lL

v IJ

II l1 II

_j_

IJ

'( .1_ /

1 , ""'

80

j II

I J

1/

160

1 50

1110

1 30

1 20

1 10

I I 1 00

lJ go

V) 0 80 � 0 LLI V)

II 70

60

�0

lW I

30

20

/2

go 1 00

1 0

0

Curve 418251 Fig. 1 7 . Typical 60-cycle time curves or the type C V J Long Time Unclervoltage Relay.

,......,,

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TYPECV RELAYS --------------------------------------------------------���-L�-�41�-2�0�1G

0

32

TYP I CAL T I ME CURVES

TYPE CV-2

UNDER VOLTAGE REL AY 30 60 CYCL ES

28

' J 26

I

I 22

I 20

I '

18 I� II I I r r , I J " 7 !/ I 1

II � J IT 1 ""' 7 T l -41 D I AL SETTIN G

'f' � 1.) I � I� I� , I I I .. 1 1 ,.,.

1 � I I 2 ... 10 """ ,_, g ""

1,.. 8 � 1 ""' � .J J II 0

7 ..... Iii" 6 !iii' """ ""' 8 :.- 5 ...... J

14 1/ , 0

3 , I j;ii L... � ... 2

.... " 1 � �rt 2

I I I I I I 0 10 20 30 140 50 60 70 80 90 100

P E R CEN T T AP VAL U E VOL TAGE Curve 41 82 50

Fig. 7 2. Typical 60-cycle Time curves ol the type CV2 Short Time Undervoltage Relay.

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TYPECVRELAYS ________________________________________________________ __

1 0

1 60

1 !50

1 110

130

1 20

1 1 0

1 0 0

V) a z 80 8 .... V)

70

60

!50

110

30

20

1 0

0 0

I

9 8

7

6

!5 11

3

2

1 "!.. !/2.

1 10 1 20 1 30 1 110

TYP I CAL T I M E C U R V ES

TYPE C V-�

OVER VOLTAGE RELAY

60 CYCL ES

1 1 T I ME D I AL SETT I N G

10

1 !50 1 60 1 70 180 1 90 200 2 1 0 220 230 2110 2!50 P E R C E N T OF TAP V A L U E VOL TAGE

406C881

Fig. 13. Typical 60-c ycle time curves of the type CV4 Long Time Overvoltage Relay.

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TYPECV RELAYS--------------------------------------------------------��·�L�·�41�-2�0�1G

Ill ... ,.... > <!I • � � ... (,J •

., Ill ... . ... ... ::E > UI � - u•u ... ... ,....

... � (,J -' IL O

� � > � -

.. ,.. ...

• ... > 0

lA .. Sit - ... .,.. -

:z -... ... ... <J'I ... • -a ... % ...

..... .... 2

01

c;(l ,.. SON003S

(X) ....

<0

10

;t

M

N

.....

Fig. 14. Typical 60-cycle time c urves of the type CVS Short Time Overvoltage Relay.

N :::;

! 0

fJ 0 ....

'W

� N

� N

� � N

0 N N

0 -N

0 0 N

0 � 0 s

0 ....

0 10

0 -

8 -

0

406C884

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TYPECVRELAYS ________________________________________________________ __

1 2

"' ... > 0

0 "' 0 0 0 a 0 <D

SONOJ3S

0 ....

,_ ,_ "' ... oC

Q ... :1:

0 "'

<D

� "'

N

2 N

0 � 0 ... N

0 N N

� N

s .. 0 � 0 � 0 � � � :i ... - "'

oC ,_ ...

0 0 <'> > ...

N :: oC

0 > � N - a.. oC ,_ 0 1-- z - ...

u a: � 0 � �

0 "' � 0 "'

0

F i g. 1 5. Typ ical 60- cycle time c urves of the type CV6 Long T i me Over and Undervoltage Relay.

406C882

�

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TY PE CV RELAYS __________________________________________________________ �I. L�-�4�1 -�20�1�G

-� ,. 0

:::

::: 2

I

"'

SONO:l3S

s

8 ..,

0 � 0 ill 0 t;; 0 "' "'

� g "'

� 0 g: 0 N

0 � 0 s 0 � 0 ,_

0 ::! 0 �

0 =: g 0 "'

0

0 0

0 "'

0 "'

g g 0 .,

0 "'

0 ..,

� 2

Fig. 1 6. Typical 60·cycle time curves of the type CV7 Short Time Over and Unclervoltage Relay.

406C883

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TYPECVRELAYS ________________________________________________________ ___

r (TIMER STOPS TINER WHEN AUX. RELAY STOP CONTACT OPEIIS)

r (TI MER STARTS TI MER WHEN SOl TCH START 'S' CL OSES)

A. C. SUPPL Y

183A02 3 Fig. 1 7. Diagram ofTest Connections of the type CV Unc!er·

v6ltage Relay.

The contact gap should be approximately . 047" between the bridging moving contact and the adjust­able stationary contacts. The bridging moving con­

tact should touch both stationary contacts simultan­eously.

Routine Maintenance

All relays should be inspected periodically and the time of operation should be checked at least once every year or at such other time intervals as may be dictated by experience to be suitable to the particular application. Phantom loads should not be used in testing induction-type relays because of the resulting distorted current wave form wh ich produces an error in timing.

All contacts sh ould be periodically cleaned. A contact burnisher S1tl82A836H01 is recommended for this purpose. The use of abrasive material for clean­ing contacts is not recommended , because of the dan­ger of embedding small particles in the face of the soft silver contact and thus impairing the contact .

Calibration

Use the following procedure for calibrating the relay if the relay has been taken apart for repairs, or the adj ustments have been disturbed. This procedure should not be used until it is apparent that the relay is not in proper working order (See "Acceptance check").

1 4

ro TI NER STOP

ro TI MER START

( Tl MER STOPS WHEII AUX. RUAY CONTACT OPEIIS)

(TINER STARTS WHEII SOl TCH 'S' Cl OSES)

TEST SOl TCH

L-....___.....__,t: •s•

A. C. SUPPLY

183A024

Fig. 18. Diagram of Test Connections ol the type CV Over• voltage Relay.

A. CV Unit

1. Contact

a) BY turning th e time dial , move th e moving contacts until they defl ect the stationary contact to a posi­

tion where the stationary contact is resting against its back stop . The index mark located on the mo ve­ment fram e should coi ncide with the "0" mark on th e time dia L For double trip rel ays, the follow on the st ationary contacts should be app ro ximately

1/64 " . b) For rei ay s identified with a " T " , located at lower

left of stationary contact block, the index mark on the movement frame will coincide with the "o•• mark on the time dial when the stationary contact

has moved thro u gh approximately on e half of its

normal defl ection. Therefore, wi th the station ary

contact resting against the backstop, the index

mark is offset to the ri ght of the "0 " mark by ap­

pro ximately . O al" . (For the type CV-6 and CV- 7 relays the back contact has no follow when th e

front contact is through one-half of its follow). The

pl acement of the various tim e dial positions in l ine

wi th th e index m ark will give operating times as shown on th e respective time-current curves. For

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TYPE CV RELAYS __________________________________________________________ I_. L_. _41_·2�0�1 G

doubl e trip rel ay s, the follow on the stationary con­tacts should be approximately 1/32".

2. Minimum Trip-Voltage - The adj ustment of the spring tension in setting the minimum trip voltage value of the relay is most conveniently made with the damping magnet removed.

With the time dial set on "0", wind up the spiral spring by means of the spring adjuster until approxi­mately 6-3/4 convolutions show.

Set the relay on the minimum tap setting and the time dial to position 6.

a. CV-4 and CV-5 Overvoltage, CV-6 and CV-7 Over or Undervoltage - Adjust the control spring tension so that the moving contact will leave the backstop of the time dial at tap value voltage + 1 .0% and will return to the backstop at tap value voltage -1.0%.

b. CV-1 and CV-2 Undervoltage Relays - Ad­just the control spring tension so that the moving con­tact will leave the backstop of the time dial at tap

value voltage -1.0% and will return to the backstop at tap value voltage +1.0%.

c. Low Pickup Overvoltage Relay - Adjust the cortrol spring so that the moving contact will leave the backstop of the time dial at 8. 1% of continu­ous voltage and return at 7.9% of continuous voltage.

3 . Time Curve Calibration - Install the permanent magnet.

a. CV-1 and CV-2 Undervoltage Rela,y - use test circuit of figure 15. With switch "S" opened , ad­just resistor "A" until voltmeter reads tap value volt­age or higher. Close switch "S" and adjust resistor "B" until the voltmeter reads 50 percent of tap value voltage. Ope n switch "S" and allow the moving con­tact to move to the backstop of the time dial. Close switch "8" and measure operating time.

Adjust the permanent magnet gap until the oper­ating time corresponds to the value given in table 1 .

b . CV-4 and CV-5 Overvoltage Rel ay, CV-8 Low Pickup Overvoltage Relay - Apply the indicated voltage of table 1 and measure the operating time. Adjust the permanent magnet keeper until the oper­ating time corresponds to the value given in table 1 .

'

c. CV-6 and CV-7 Over or Undervoltage � - Apply the indicated voltage of table 1 artd meastre the operating time. Adjust the permanent magnet keeper until the operating time corresponds to the value given in table 1.

Measure the reset time of the disc from the station­ary front contact to the stationary back contact. This time should be as shown in table 1 .

TABLE I

P er c e nt T a p T i me Operat i n g R e set Type V a l ue V o l t a g e Or D i o l T i me T i me R e l a y P i c k u p Vo l t a g e Sett i n g i n Se c . i n Sec .

CV1 50 6 68 CV2 50 6 8. 6 CV4 140 6 37.5 CV5 140 6 6. 8 CV6 140 6 33 32.5 CV7 140 6 5 . 9 5 . 7 cvs 800 6 3.0

B. Indicating Contactor Switch - Unit (ICS) - Close the main relay contacts and pass sufficient d-e cur­rent throug h the trip circuit to close the contacts of the ICS. This value of current should not be greater than the particu lar ICS setting being used. The indi­cator target should drop freely.

RENEWAL PARTS

Repair work can be done most satisfactorily at the factory. However, interchangeable parts can be furnished to the customers who are equipped for doing repair work. When ordering parts, always give the complete nameplate data.

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1 6

!-l�o�c��fcK PANEL USE !._- 18 SlUD) 18

• 190-32 SCREW FOR TH I CK PAII EL USE • 1 90-32 STUD .._.,.,�---

TEIIMIIAL AIID MOUITI.G DETAILS

f

� I L OT Pl ATE SHAP} R�A�LAY ( TA� TO WHEH USED

�� DRILLIMG OR CUTOUT FOR .-.. �CTIOI MTG.

(FDT YIEW)

s ! 8

Fig. 1 9· Outline and drilling f FTJ l 57 -D-7900

or case d I use or projection and/or se . f/ h ml• us case.

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TYPE CV RELAYS --------------------------------------------------------�� -�L�- �41�·2�0l�G

.... �

a .!. r---I t

- e .L.,.. i

l _ _ , : :

I I II I I 1 1 1 1 1 1 1 1 I I I I I'AIIEL �TIOII __/ / SEMI FWS11 m.� .. O.ItCTI OII Nf'8,

. 1 80-32 SCI£W TOOT1t£D LOCIIASKEJ

�..-r-- I'AIIEL

.!_ ·18 SCIEW I I FOit THICK

TERMIIIAL AIID MOUIITIIIG DETA I LS

AIIEL USE �� - II ITID) , 1 80-32 SCREW

3 "i"DIA. I O NOW Olt CUT OUT

_[I �� ___, .!. DIA,, KOUS Fell

2 21 _ 1 ./' . r eo-at m.�e�aa 32 ¥-

I'AIIEL DI I UIIIG Olt CUTOUT FOR I'IOJtCTIOII Mra.

(FIDIO' VIEW)

57-D-7901

F ig . 20. O utline and drilling for F Tl l case used for p rojection and/or se mi-flush case. (For 67 volt CV-8 relay o nly)

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W ESTINGHOUSE ELE C T R I C C O R P O R A T I O N RELAY- I NSTRU MENT D IVI S I O N NEWARK, N. J.

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Westinghouse I .L.41-20 1 F

INSTALLATION • OPERATION • MAINTENANCE

INSTRUCTION S

TYPE CV VOLTAGE RELAY

C AU T I ON Before putting relays into servi ce , remove all blocking which may have been inserted for the pur· pose of securing the parts during shipment , make sure that all moving parts operate freely, insp ect the co n· tacts to see that they are cl ean and close properly, and operate the relay to check the settings and electrical connections.

APP LICATI ON

The type CV rel ays are single-phase induction­di sc type relays operating either on under or over voltage or both. These relays are applied as a volt­age fault detector operating in conjunction with other protective relays. The relays are also used as timing devices for various automatic operations.

CONTENTS

This instruction leaflet applies to the following types of relays:

CV-1 Long Time Undervoltage Relay CV-2 Short Time Undervoltage Relay CV-4 Long TilT'e Overvoltage Relay CV-5 Short Time Overvoltage Relay CV-6 Long Time Over or Undervoltage Relay CV-7 Short Time Over or Under voltage Relay CV-8 Low Voltage Pickup Overvoltage Relay

CONSTRUCTION AND OPERATION

The types CV- 1 , CV-2, CV-4, CV-5, CV-6, and CV-7 relays consist of a voltage unit and an indicating contactor switch (ICS). The principal component parts of the relay and their loc ation are shown in figures 1, 2, and 3.

The type CV-8 relay in addition to the above com­ponents also has a capacitor which is series tuned with the main coil of the electromagnet. This tuned circuit offers a low impedance to fundamental current and a high impedance to third harmonic currents. Hence, the relay has a low pick up value for funda­mental voltage and a much higher value of pickup for third harmonic voltage. At rated voltage the electro­magnet is saturated causing the circuit to be detuned. The impedance of the circuit is increased and limits the fundamental current to a safe value.

SU P E RSEDES I . L. 41-20 1 E * Denotes ch ange from superseded i ssue.

A. Voltage Unit (CV)

The overvoltage unit operates on the induction­disc principle. A main tapped co il located on the center leg of an "E" type laminated structure produces a flux which divides and returns through the outer legs. A shading coil causes the nux through the left leg (front view) to lag the main pole flux. The out-of­phase fluxes thus produced in the air gap causes a contact closing torque.

The undervoltage unit operates on the same prin­ciple as the overvoltage unit except the shading coil is on the right leg (front view). This causes the out-of-phase fluxes to produce a contact opening torque.

B. Indicating Contactor Switch (ICS)

The indicating contactor switch is a small d-e operated clapper type device . A magnetic armature, to which leaf-spring mounted contacts are attached , is attracted to the magnetic core upon energization of the swi tch. When the switch closes, the moving con­tacts bridge t wo stationary contacts, completing the trip circuit. Also, during this operation two fingers on the armature deflect a spring located on the front of the switch, which allows the operation indicator target to drop. The target is reset from the outside of the case by a push rod located at the bottom of the case.

The front spring, in addition to holding the target, provides restraint for the armature and thus controls the pickup value of the switch.

CHARACTERISTICS

The low pickup CV-8 Overvoltage Relay is avail­able with the following continuous voltages .

6 7 volts 199 volts

The m1rumum voltage required to just close the CV-8 contacts is 8% of the continuous voltage. TYPi· cal operating time s of the type CV-8 relay are shown on figure 8.

The CV-1 and CV-2 Undervoltage Relays, CV-4 and CV-5 Overvoltage Relays, and CV-6 and CV- 7

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TYPE CV R E LAYS

1

2

F ig. 1. Type CV-2 Relay Without Case. 1-Voltage Unit (CV}. 2-lndicating Contactor Switch (ICS}. 3-lndicating Contactor

Switch Tap B lock.

2

3

5

6

4

Fig. 2. Voltage Unit (CV}. 1- Tap B lock. 2- Time D ia l. 3- Control Spring A ssembly. 4-D isc, 5-Stationary Contact A ssembly. 6-Permanent Magnet.

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TYPECVRELAYS __________________________________________________________ �I�. L�· �41�-2�0�1 F

Fig. 3. Indicating Contactor Switch (ICS).

Over or Undervoltage Relays are available in the following voltage ranges:

R a nge

55-140 55 64 1 10-280 1 10 128

T a p s

70 82 140 164

93 1 05 120 140 186 210 240 280

A . CV- 1 and CV-2 Undervoltage Relays -- CV-4 and CV-5 Overvoltage Relays

Tap value voltage is the minimum voltage re­quired to just close the relay contacts. At this value of voltage , the moving contacts will leave the back­stop of the time dial and move to close the front contacts. Normal operation of the two relays is such that the CV-1 and CV-2 undervoltage relays will open its contacts with application of voltages greater than tap value voltage , while the CV-4 and CV-5 overvolt­age relay closes its contacts with voltages greater than tap value voltage. Thus, the operating curves of figures 9 and 10 of the undervoltage relays apply when the voltage is originally higher than tap value voltage and is suddenly reduced to a value shown on the curves. The operating c urves of figures 11 and 12 of the overvoltage relays apply when the voltage is initially below tap value voltage and is suddenly raised to a value shown on the curves.

B. CV-6 and CV-7 Over or Undervoltage Relays

Tap value voltage is the value of voltage at which the stationary front contact closes. The stationary

back co ntact will close within 5% of this value .

When the relay is used as an overvoltage relay, the moving contact is made with the stationary back cortact for values of applied voltage less than tap

value voltage. With application of voltages greater than tap value voltage, the moving contact moves to close the front contact in a time as shown by the right-hand curves of either figures 13 or 14.

When the relay is used as an undervoltage relay, the moving contact is made with the st ationary front cont act for value s of applied voltage greater than tap value voltage . With the application of voltages les s than tap value voltage, the moving contact moves to close the back cont act in a time as shown on the left-hand curves of either figures 13 or 14 .

Trip Circuit

The main contacts will safely close 30 amperes at 250 volts d-e and the seal-in contacts of the indi­cating contactor switch will safely carry this current long enough to trip a circuit breaker.

The indicating contactor switch has two taps that provide a pickup setting of 0. 2 or 2 amperes. To change taps req uire s connecting the lead located in front of the tap block to the desired setting by means of a screw connection.

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TYPECVRELAYS __________________________________________________________ __

IIDICATUIIO CCMTACI'OI SWITCM

IIIDUCTI OII UIIT

RED MAIIDLE

TEST IIITCII

TEJMIIIAL

182A725 Fig. 4. Internal Schematic of the Double Trip Type CV Un·

Jer or Overvoltage Relays In Type FT J J Case. For the Single Trip Relays the Circuits As-elated with Terminal 2 are OmiHeJ.

Trip Circuit Constants

Indicating contactor - 0.2 amp. tap 6.5 ohms d-e switch resistance

2.0 amp. tap 0. 15 ohms d-e resistance

ENERGY REQUIREMENTS

The burdens of the CV- 1 , CV-2, CV-4, CV-5 , CV-6, CV-7 relays a t rated voltage are a s follows :

R o te d6

V o lt a g e

120 or 240 Volts

T a p s 120 Volt 240 Volt

Relay Relay

55 1 10 64 128 70 140 82 164 93 1 86

105 2 10 1 20 240 140 280

Vo l t­Amp s .

10.0 7.0 5 . 8 4 . 0 3 . 1 2 . 4 1 . 8 1 . 3

P ower F a ctor

.38

.35

.34

.33

. 3 1

. 29

. 28

. 26

W a t t s

3 . 8 2 . 5 2.0 1.3 1 .0

.7

.5

. 3

6These relays will continuously stand either 1 1 0% of rated voltage or tap value voltage, whichever. is higher.

4

UIDICATIAU COtiTACTOI SWITttl

FROIIT YIEV

IIIDUCTIOI llll l

lED MAIIDI.E TEST SWITCM

182A727

Fig. 5. Internal Schematic of the type CV Over or Under­voltage Relay il! Type FTJ J case.

The burdens of the CV-8 relays at continuous voltage are as follows:

Cont i n u o u s V o l t a g e

199 67

A. CV Unit

V o l t A m p s .

30 30

P ower F a c tor

.342

. 34 2

SETTINGS

W a t t s

10 10

The setting of the CV unit can be defined either by tap setting and time dial position or by tap setting and a specific time of operation at some percentage of tap value voltage (e .g. on CV-4 120 tap setting , 2 time dial position or 120 tap setting, 1 2 seconds at 140 percent of tap value voltage).

To provide selective circuit breaker operation, a minimum coordinating time of 0.3 seconds plus circuit breaker time is recommended between the relay being set and the relays with which coordination is to be effected.

The connector screw on the terminal plate above the time dial connects various turns of the operating coil. By placing this screw in the various terminal plate holes, the relay will just close its contacts at the corresponding voltage of 55-64-7G-82-93- 105- 120-* 140 volts or as m arked on the terminal plat e .

The nylon screw on the terminal plate holds the tap plate in position when tap s are being c hanged. To

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TYPECVRELAYS ___________________________________________________________ 1 · L_•_4_1 -_

2o_l_F

IIDICATIII8 COIT&CTDI IWI TCH

fROIIT YllW

182A726

Fig. 6. Internal Schematic of the type CVB 199 volt relay in type F T 1 1 case.

use the position on the tenninal plate in which the nylon screw is used, remove the nylon screw and place it in one of the unused holes. Then remove the tap screw and insert it in the terminal plate hole.

Instantaneous Reclosing

The factory adjustment of th e voltage unit con­tacts provides a contact follow. Where circuit breaker reclosing will be initiated immediately after a trip by the over voltage contact, the time of the opening of the contacts shoul d be a minimum . This condition is obtain ed by loosening the stationary contact mounting screw, removing the contact pl ate and th en replacing the plate with th e bent end resting against the contact spring.

For double trip relays , the upper stationary con­tact is adjusted such that the contact rests solidly against the back stop . The lower stationary contact is then adj usted such that both stationary contacts make contact simultaneously with their respective moving contact.

B. Indicating Contactor Switch (ICS)

No setting is required on the ICS unit except the selection of the 0 . 2 to 2 . 0 ampere tap setting. This selection is made by connecting the lead located in front of the tap block to the desired setting by means of the ronnecting screw.

INSTAL LATION

The relays sh ould be mounted on switchboard panels or their equivalent in a location free from dirt, moisture, excessive vibration, and heat. Mount the

UID"ATIIUi COITACTOR SWITCH

182A743

Fig. 7. Internal Schematic o f the type CVB 6 7 volt relay In type F T2 1 case.

relay vertically by means of the four mounting holes on the flange for semi-flush rr.ounting or by means of the rear mounting stud or studs for proj ection mount­ing. Either a mounting stud or the mounting screws may be utilized for grounding the relay. The elec­trical connections may be made directly to the ter­minals by means of screws for steel panel mounting or to the terminal studs furnished with the relay for thic k panel mounting . The terminal studs may be easily removed or inserted by locking two nuts on the stud and then turning the proper nut with a wrench .

For detailed FT Case information refer to I .L. 41-076.

ADJUSTMENTS AND MAINTENANCE

The proper adjustments to insure correct operation of this relay have been made at the factory. Upon receipt of the relay, no customer adjustment s, other than those covered under "Settings" , should be required.

Acceptance CheC;k

The following check is recommended to insure that the relay is in proper working order:

A. CV Unit

1. Contact

a) By turnin g the time dial , move the movin g contacts

until th ey d efl ect the stationary contact to a posi­

tion where the stationary contact is resting against

its backstop . The index mark located on the move­ment frame should coincide with the "0" mark on

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TYPECVRELAYS __________________________________________________________ ___

6

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P ER CEN T P I CK-UP VOL T AGE

TY P I CAL T I ME CURVES TYP E CV-8

OVER VOLTAGE RELAY 60 CYCL ES

DIAL SETTING

1 600

Curve 418252 Fig. 8. Typical 60-cyde time curves of the type CVB Low P ickup Overvoltage Relay.

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TY PE CV RELAYS ___________________________________________________________ I ._L._4_1 -_2o_l_F

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Curve 418251 Fig. 9. Typical 60-cycle time curves or the type C V J Long Time Unclervoltage Relay.

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TYPECVRELAYS ________________________________________________________ ___

0

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lYr i CAL T I ME CURVES

TYPE CV-2

UNDER VOLTAGE REL AY

60 CYC L ES

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10

� 1 50 1 60 1 7 0 1 80 1 90 200 2 1 0 220 230 2�0 2!50

P E R C E N T OF TAP V A L U E VOLTAGE

4o6c88I Fig. J J. Typical 60-cycle time curves ol the type CV4 Long Time Overv.oltage Re lay.

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TYPE CV•5

OVER VOL TAG£ RELAY

60 CYCLES

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TYPE CV RELAYS

r (TIMER STOPS TIMER MIEN AUX. RElAY STOP CONTACT OPEIIS)

r ( TIMER STARTS TIMER MIEN S•l TCK START '$' CLOSES)

A. C. SUPPlY

l83A023

F ig. 15. Diagram of Test Connections ofthe type CV Uncler­v6ltage Relay.

the time dial . For double trip relays, the foll ow on

the stationary contacts shoul d be approximately

1/64" .

b) For relays identified with a "T .. , located at lower

left of stationary contact block , the index mark on the movement fram e will coincide with the "0 .. mark on the time dial when the stationary contact has moved through approximately one h al f of its normal defl ection. Therefore , with the station ary contact resting against the backstop , the index

ma!k is offset to the ri ght of the "0" mark by ap­pro xim ately .0 20". (For th e type CV· 6 and CV-7 relays the back contact has no fol lo w when th e front contact i s through one-half o f its follow) . Th e placem ent of the various time dial positions in line

with the index mark will give operatin g times as shown on the respective time- current curves. For

double trip rel ays, the follow on the stationary con­

tacts should be approximately 113 2••,

2. Minimum Trip Voltage - Set the time dial to position 6. Alternately apply tap value voltage plus 3% and tap value voltage minus 3%.

I .L. 41-201F

ro ( TIMER SlliPS TI MER MIEN AUX. RELAY SlliP CONTACT OPENS) } �MER

( TI MER STARTS MIEll S•l TCK

START 'S' CLOSES)

l83A024

TEST S•I TCK •s•

�----ol-------+--o 't::: A,C, SUPPlY

F ig. 1 6. Diagram of Test Connections of the type CV Over• voltage Relay.

a. CV-4 and CV-5 Overvoltage Relays, CV-6 and CV-7 Over or Undervoltage Relays - The moving cont act should leave the backstop at tap value volt­age plus 3% and should return to the backstop at tap value voltage minus 3%.

b. CV-1 and CV-2 Undervoltage Relays - The moving contact should leave the backstop at tap value voltage minus 3% and should return to the back­stop at tap value voltage plus 3%.

c. CV-8 Overvoltage Rela,ys - The moving contact should leave the backstop at 8.5% of contin­uous voltage.

3. Time Curve - Table 1 shows the time curve calibration points for the various types of relays. With the time dial set to the indicated position, apply the voltages specified in table 1 (e. g. for the CV-4, 140 percent of tap value voltage) and measure the ope rating time of the relay. The operating time should equal those of table 1 plus or minus 5%.

B. Indicating Contactor Switch (ICS) - Close the main relay contacts and pass sufficient d-e current throug h the trip circuit to close the contacts of the ICS. This value of current should not be greater than the particular ICS setting being used. The indi­cator target should drop freely.

The contact gap should be approximately .047" between the bridging moving contact and the adjust-

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TYPE CV RELAYS. ________________________________________________________ ___

able stationary contacts. The bridging moving con­

tact should touch both stationary contacts simultan­eously.

Routine Maintenance

All relays should be inspected periodically and the time of operation should be c hecked at least once every year or at such other time intervals as may be dictated by experience to be suitable to the particular application. Phantom loads should not be used in testing induction-type relays because of the resulting di storted current wave form which produces an error in timing.

All contacts should be periodically cleaned. A contact burnisher SI/:182A836H01 is recommended for this purpose. The use of abrasive material for clean­ing contacts is not recommended, because of the dan­ger of embedding small particles in the face of the soft silver contact and thus impairing the contact .

Calibration

Use the following procedure for calibrating the relay if the relay has been taken apart for repairs, or the adj ustments have been disturbed. This procedure should not be used until it is apparent that the relay is not in proper working order (See "Acceptance check").

A. CV Unit

1. Contact

a) By turning th e tim e dial, move th e moving contacts until th ey defl ect th e stationary contact to a posi­

tion where the stationary contact is restin g against its back stop . The index mark loc ated on the move­ment fram e should coincide with the "0" mark on

the time dial . For double trip rei ays, the foll o w on the stationary contacts should be app ro ximately

1/64 " .

b) For rel ays identified with a "T " , loc ated at lower left of stationary contact block, th e index mark on the moveme nt frame will coincide with the "0" mark on the time dial when the stationary contact

has moved throu gh approxi mately on e half of its

normal defl ection. Therefore, wi th th e station ary

contact resting against the backstop, the index

mark is offset to the ri ght of the "0 " mark by ap­

pro ximately . O :D ". (For the type CV-6 and CV- 7

relays the back contact has no follow when th e

front contact is through one-half of its follow). The

pl acement of the various tim e dial positions in lin e

with th e index m ark will give operating times as shown on th e respective time-current curves. For

14

doubl e trip rel ay s, the foll ow on the stationary con­tacts should be approximately 1/32".

2. Minimum Trip-Voltage - The adjustment of the spring tension in setting the minimum trip voltage value of the relay is most conveniently made with the damping magnet removed.

With the time dial set on "0", wind up the spiral spring by means of the spring adjuster until approxi­mately 6-3/4 convolutions show.

Set the relay on the minimum tap setting and the time dial to position 6.

a. CV-4 and CV-5 Overvoltage, CV-6 and CV-7 Over or Undervoltage - Adjust the control spring tension so that the moving contact will leave the backstop of the time dial at tap value voltage + 1 .0% and will return to the backstop at tap value voltage - 1 .0%.

b. CV-1 and CV-2 Undervoltage Relays - Ad­just the control spring tension so that the moving con­tact will leave the backstop of the time dial at tap value voltage - 1 . 0% and will return to the backstop at tap value voltage +1.0%.

c. Low Pickup Overvoltage Relay - Adjust the control spring so that the moving contact will leave the backstop of the time dial at 8. 1% of continu­ous voltage and return at 7 .9% of continuous voltage.

3. Time Curve Calibration - Install the permanent magnet.

a. CV-1 and CV-2 Undervoltage Relay - Use test circuit of figure 15. With switch "8" opened, ad­just resistor "A" until voltmeter reads tap value volt­age or higher. Close switch "8" and adjust resistor "B" until the voltmeter reads 50 percent of tap value voltage. Open switch "8" and allow the moving con­tact to move to the backstop of the time dial. Close switch "8" and measure operating time.

Adjust the permanent magnet gap until the oper­ating time corresponds to the value given in table 1 .

b. CV-4 and CV-5 Overvoltage Relay, CV-8 Low Pickup Overvoltage Relay - Apply the indicated voltage of table 1 and measure the operating time. Adjust the permanent magnet keeper until the oper­ating time corresponds to the value given in table 1 .

c. CV-6 and CV-7 Over or Undervoltage Relay - Apply the indicated voltage of table 1 artd meas\l'e the operating time. Adjust the permanent magnet keeper until the operating time corresponds to the value given in table 1.

Measure the reset time of the disc from the station­ary front contact to the stationary back contact. This time should be as shown in table 1 .

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TYPE CV R ELAYS I .L. 41-20 1 F

Type R e l a y

CV1 CV2 CV4 CV5 CV6 CV7 CV8

TABLE I

P er c e nt T o p T i m e Ope r o t i n g R e set V a l ue V o lta ge Or D ia l T i me T i me

P i c k up V o l t a g e Sett i n g i n Sec . i n Sec.

50 50

140 140 140 140 800

6 6 6 6 6 6 6

68 8. 6

37.5 6.8

33 5 . 9 3 . 0

t .. � \!1 �! ! PI>.N:L LOCA.TI()N '!>EMI -FLUS\4 MTGr. , PROJ'ECT I 0 \-.1 MTGr. ______]

w \ll

1 9 o-n sc.R.E.w PANEL

..( 5PAC.ER FOR. U /THI"' P..._NEL'O

/ � :i - 1e ':.CREW

32.5 5.7

9 T6

B. Indicating Contactor Switch - Unit (ICS) - Close the main relay contacts and pass sufficient d-e cur­rent through the trip circuit to close the contacts of the ICS. This value of current should not be greater than the particular ICS setting being used. The indi­cator target should drop freely.

RENEWAL PARTS

Repair work can be done most satisfactorily at the factory. However, interchangeable parts can be furnished to the customers who are equipped for doing repair work. When ordering parts, always give the complete nameplate data.

PANEL CUTOUT t DRILUNGr F'OR SEMI-FLU�\-\ MTG .

9 � 011>-.HOLE

16 ( f"OR THICK 1 f""NEL USE __ ----.jt-+--+---l---4 1,.,- ta !:.TUO) .190 -�z �CREW

TC:RMI "'AL AND M OUNT I NG- DETAIL!:.

N O T E : A LL D l M I=.N S I O NS. I N I N C H E S,,

FOR

F ig. 1 7. Outline and drilling for FT l l case used for projection and/or semi-flush case.

57-D-7900

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TYPECVRELAYS ______________________________________________________ ___

&..------- . tc;:,0-32. SC.RE.W � � PANEL ' w � SPACER FOR 0 T\-IIN PANELS

.fl -IB SCRE.W 16 (rOR. 11·\IC\o<.. �NEL USE 16- 18 O:.TUD) . ! CJ0 · '3'2. SCREW

TERMIN�L �N D 1-1\0\..lNTI N q Ot:'T,._I\ ... � N O T E : A L L D I M E N5 \ 0 N S I N I N C H E S

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PANEL CUTOUT 4 DR.ILL\ WG­�OR. SEMI-F \..U5\-I MTG.

I 'i"l.. ?AWE\.. CR\L\...\ NG- OR. CUTOUT PROJ"E.C.T\ON MTG.

(rRO)..lT V\E.W)

57 -D -7901

Fig. 78. Outline and drilling for FT2 1 case used for projection and/or semi-flush case. (For 67 volt CV-8 relay only)

W ESTINGHOUSE ELECTR I C R E LAY- I N STRU M E NT D IVI S I O N

COR P OR A T ION N E WARK, N. J.

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