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Westinghouse I.L. 41-201M

INSTALLATION • OPERAT10N • MAINTENANCE · : : :

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TYPE CV VOLTAGE RELAY

CAUTION

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.

APPLICATION

The Type CV Relays are single-phase induction­disc type relays operating either on under or over­voltage 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 Time Overvoltage Relay CV-5 Short Time Overvoltage Relay CV-6 Long Time Over or Undervoltage Relay CV-7 Short Time Over or Undervoltage 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 location are shown in Figs. l, 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 pickup 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.

A. Voltage Unit (CV)

The overvoltage unit operates on the induction­disc principle. A main tapped coil 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-of-phase 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 switch. When the switch closes, the moving contacts bridge two stationary contacts, completing the trip circuit. Also, during

All possible contingencies which may arise during installation, operation, or maintenance, and all details and variations of this equipment do not purport to be co Fe red by these instructions. If further information is desired by purchaser regarding his particular installation, operation or maintenance of his equipment, the local Westinghouse Electric Corporation representatire should be contacted.

SUPERSEDES I.L. 41-201L DATED SEPTEMBER 1982 EFFECTIVE JANUARY 1984 www . El

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Fig. 1. Type CV-2 Relay Withou t Case. 1-Voltage Unit (CV). 2-lndicating Contactor Switch (ICS).

3-lndicating Contactor Switch Tap Block.

Fig. 2. Voltage Unit (CV). 1-Tap Block. 2-Tim e D ial. 3-Control Spring Assem bly. 4-D isc.

5-Stationary Contact Assem bly. 6-Permanent Magnet.

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Fig. 3. Indicating Contactor Switch (ICS).

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.

Type Relay

67 volts 199 volts

2 Minute Rating

140 volts 300 volts

The minimum voltage required to just close the CV-8 contacts is typically 8% of the continuous voltage. Typical operating times of the type CV-8 relay are shown on Fig. 10. 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. However, the operate times for the adjustable CV-8 relay will differ from Fig. 10 and will depend on the pickup setting.

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

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

Range Taps 55-140 55 64 70 82 93 105 120 140

110-280 110 128 140 164 186 210 240 280

A. CV-1 and CV-2 Undervoltage Relays­CV-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 Figs. 1 1 and 12 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 curves of Figs. 13 and 14 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

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Under or Overvoltage Relays in Type FT11 Case.

For th e Single Trip Relays the Circuits associated

with Terminal 2 are Omitted.

stationary back contact 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 contact 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 Figs. 15 or 16.

When the relay is used as an undervoltage re­lay, the moving contact is made with the station­ary front contact for values of applied voltage greater than tap value voltage. With the applica­tion of voltages less than tap value voltage, the moving contact moves to close the back contact in a time as shown on the left-hand curves of either Figs. 15 or 16.

Trip Circuit

The main contacts will close 30 amperes at 250 volts d-e and the seal-in contacts of the indi­cating contactor switch will 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.

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Fig. 5. Internal Sch ematic of the Type CV Over or

Undervoltage Relay in Type FT11 Case.

To change taps requires connecting the lead lo­cated in front of the tap block to the desired set­ting by means of a screw connection.

Trip Circuit Constants

Indicating Con tactor Switch . ... 0.2 amp. tap 6. 5 ohms d-e resistance

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

SETTINGS

A. CV Unit

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, 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

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various terminal plate holes, the relay will just close its contacts at the corresponding voltage of 55-64-70-82-93-105-120-140 volts or as marked on the terminal plate.

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

The CV-8 relay has no taps. Its minimum pickup of approximately 8% of continuous volt­age is set by adjusting the restraint spring. For this setting, the adjustable resistor, where used, should be shorted out.

Where the resistor is used, the pickup setting can be adjusted from approximately 8% to 30% of the continuous voltage rating. This setting is made by adjusting the resistor. Note, however, that the CV-8 time curves shown in Fig. 10 apply only when the resistor is shorted out. Timing tests should be conducted after the resistor is used to change the pickup. This will insure proper coordination time for the desired pickup setting.

Instantaneous Reclosing

The factory adjustment of the voltage unit contacts provides a contact follow. Where circuit breaker reclosing will be initiated immediately after a trip by the overvoltage contact, the time of the opening of the contacts should be a mini­mum. This condition is obtained by loosening the stationary contact mounting screw, removing the contact plate and then replacing the plate with the 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 backstop. 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 lo­cated in front of the tap block to the desired set­ting by means of the connecting screw.

I.L. 4 1-20 1 M

ENERGY REOUI REMENTS

The 60 Hz burdens of the CV-1, CV-2, CV-4, CV-5, CV-6, CV-7 relays at rated voltage are as follows: (For 50 Hz, multiply voltamperes by 1.18, multiply watts by 1.38.)

Taps tJ. Rated 120 Volt 240 Volt Volt· Power Voltage Relay Relay Amps. Factor Watts

55 110 10.0 .38 3.8 64 128 7.0 .35 2.5 70 140 5.8 .34 2.0

120 or 82 164 4.0 .33 1.3 240 Volts 93 186 3.1 .31 1.0

105 210 2.4 .29 . 7 120 240 1.8 .28 .5 140 280 1.3 .26 .3

The 50 Hz and 60 Hz burdens of the CV-8 re­lays at continuous voltage do not exceed the fol­lowing:

!::. Continuous

Voltage

199 67

Range

5.4 to 20V

16 to40V

Volt

Amps.

30 30

Power

Factor

.342 .342

CV -8 With Adjustable Pickup

Applied

Setting Voltage

5.4 67 20 67 16 199 40 199

Watts

10 10

VA

30 15 30 20

The short time ( 15 seconds) rating is 240V and 51 OV respectively for the 67 and 199V relay.

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

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 means of the four mounting 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 terminals by means of screws for steel panel mounting or to

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Relay in Type FT11 Case.

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Fig. 7. Internal Schematic of the Type CV-8 67 Volt

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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.

Performance Check

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

A. CV Unit

1. Contact

a) By turning the time dial, move the 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 dial. For double trip relays, the follow 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 movement 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 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 dial positions 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 contacts should be approximately 1/32".

I.L. 4 l -20 1 M

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 Overvol tage Relays, CV -6 and CV-7 Over or Undervoltage Relays

The moving contact 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 between 8.3% and 7. 7% of continuous voltage. Note that the resistor, where used, should be shorted when making these measurements.

Where the resistor is used, the pickup setting can be adjusted from approximately 8% to 30% of the continuous voltage rating. This setting is made by adjusting the resistor. Note, however, that the CV-8 time curves shown in Fig. 10 apply only when the resistor is shorted out. Timing tests should be conducted after the resistor is used to change the pickup. This will verify proper co­ordination time for the desired pickup setting.

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 operat­ing time of the relay. The operating time should equal those of Table 1 plus or minus 5%. Note that the resistor, where used in CV-8, should be shorted when making this measurement.

B. Indicating Contactor Switch (ICS)

Close the main relay contacts and pass suffi­cient d-e current through the trip circuit to close

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1e contacts of the ICS. This value of current should not be greater than the particular res set­ting being used. The intlicator target should drop freely.

The contact gap should be approximately .047" between the bridging moving contact and the adjustable stationary contacts. The bridging moving contact 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 inte.r.rals 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 which produces an error in timing.

All contacts should be periodically cleaned. A contact burnisher S# 182A836HO 1 is recom­mended for this purpose. The use of abrasive

'aterial for cleaning contacts s not recom­. ended. because of the danger of embedding

small particles in the face of the soft silver con-tact and thus impairing the con tact.

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 "Performance Check'').

A. CV Unit

1. Contact

a) By turning the time diaL move the moving contacts until they detlect 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 dial. For double trip relays, the follow 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 in-

8

dex mark on the movement 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 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 dial positions in line with the index mark will give operating times as shown on the respec­tive time-current cu.r.res. For double trip re­lays, the follow 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. CV-8 Low Pickup Overvoltage Relay

Adjust the control spring so that the moving contact will close at 8.2% or more of continuous voltage and return to the backstop at 7.8% or less of continuous voltage. The fixed, or adjusta­ble resistor. where used, should be shorted during these measurements and the short removed when completed.

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Where the resistor is used, the pickup setting can be adjusted from approximately 8% to 30% of the continuous voltage rating. This setting is made by adjusting the resistor. Note, however, that the CV-8 time curves shown in Fig. 10 apply only when the resistor is shorted out. Timing tests should be conducted after the resistor is used to change the pickup. This will verify proper coordi­nation time for the desired pickup setting.

3. Time Curve Calibration

Install the permanent magnet.

a. CV-1 and CV-2 Undervoltage Relay

Use test circuit of Fig. 18. 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. Open switch "S" and allow the moving contact to move to the back­stop of the time dial. Close switch "S" 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 I and measure the operating time. Adjust the perma­nent magnet keeper until the operating time cor­responds to the value given in Table 1.

l.L. 4 l-20 1 M

c. CV-6 and CV-7 Ov�r or Undervoltage 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.

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

Table 1

Percent Tap Time Type Value Voltage or Dial Relay Pickup Voltage Setting

CV1 50 6 CV2 50 6 CV4 140 6 CV5 140 6 CV6 140 6 CV7 140 6 CV8 800 6

Operating Time

in Sec.

68 8.6

37.5 6.8

33 5.9 3.0

Reset Time

in Sec.

32.5 5.7

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.

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Fig. 11. Typical Time Curves of the Type CV-1 Long Time Undervoltage Relay.

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TYPICAL TIME CURVES TYPE CV-2

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Fig. 12. Typical Tim e Curves of the Type CV-2 Sh ort Tim e Undervoltage Relay.

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P E R C E N T OF TAP VAL U E VOl TAGE

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Fig. 7 3. Typical Time Curves of the Type CV4 Long Time Overvoltage Relay.

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APPLIED FREQUENCY AS A MULTIPLE OF RATED FREQUENCY

Curve 619585

Fig. 1 7. Typical Sensitivity Curves of the Type CV-8 L ow Voltage Pickup Overvoltage Relay.

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( T J •U STOPS 1 TO � T I • E • �EM AUI. IHAT ) STOP co• ucT oPEJIS)

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Diagram of Test Connections of the Type CV

Undervoltage Relay.

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TEST SWI TCM

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183A024

Diagram of Test Connections of the Type CV

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(l��bl OIA. 2 HOLES

570 7900

Fig. 20. Outline and D rilling for FT 1 1 Case used for Projection and/or Semi-Flush Case.

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W E S T I N G H O U S E R E LAY - I N ST R U M E N T D I V I S I O N

E L E C T R I C C O R P O R A T I O N C O R A L S P R I N G S , FL 33065

Printed in U.S.A

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