Westinghouse 1. L. 41-497. 2

INSTALLATION • OPERATION • MAINTENANCE

INSTRUCTIONS TYPE KDTG- DISTANCE AND TIMER RELAY

CAUTION: Before putting protective 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

Type KDTG relay is a polyphase compensator type distance relay with a static two Zone timer. The distance unit responds to phase-to-phase faults, two-phase­to-ground, and single phase to ground faults. This unit is identical in its response to the phase-to-phase unit of the KD-TYPE distance relays and does not operate on three-phase faults. The type KDTG-relay is used as a common relay with the KDXG-ground reactance relays to directionally supervise the trip circuit for high speed clearing of single phase-to-ground faults in the first Zone of protection and is used to provide accurate time delayed switching of the reactance units to second and third Zone settings. This relay is not subject to wrong directional sensing due to mutual induction on parallel lines where it may exsist under special conditions.

CONSTRUCTION AND APPLICATION

The KDTG relay consists of a single cylinder type unit, two single air gap compensators, two auto transformers, two timing circuits, three telephone relays, one voltage regulator, 3 blocking diodes, one pulsing transformer, three operat­ional Zone indicators, and one contactor switch.

Compensator

The compensators which are designated TAB and TBc are three-winding air-gap transformers. There are two primary current windings each current winding has seven taps which terminate at the tap block. They are marked 1.5, 2.0, 2.50, 3.50, 5.0, 7.0 and 10.0. Current flowing through the primary coil provides an MMF which produces magnetic lines of flux in the core.

A voltage is induced in the secondary winding which is proportional to the primary tap and current magnitude. This proportionality is established by the cross sectional area of the laminated steel core, the length of an air gap which is located in the center of the coil, and the tightness of the laminations. All of these factors which influence the secondary voltage proportionality have been precisely set at the factory. The clamps vThich hold the laminations should not be disturbed by either tightening or loosening the clamp screws.

The secondary winding is connected subtractively in series with the relay terminal voltage. Thus a voltage which is proportional to the phase current is subtracted vectorially from the relay terminal voltage. The secondary

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windimg loaded with an adjustable resistor and provides a means of adjustiag the phase aagle relation between primary current aad the iaduced secondary voltage. The factory setting is for maximum torque angle of 75° current laggiag the voltage.

Auto-Transformer

The auto-transformer has three taps on its main wiadiag, s, which are aumbered 1, 2, and 3 on the tap block.

The auto-transformer makes it possible to expand the basic range (T = 1. 5 to 10.0 ohms) by a multiplier of S • Therefore, aay relay ohm setting caa be made within +15 percent from 1.5 ohms to 30 ohms by combiaiag the compensator taps TAB, aad TBC with the auto-transformer taps, SA aad Sc•

Trippiag Unit

The device which acts to initiate tripping is a four-pole cylinder uait which is connected open delta and operates as a three-phase induction motor. Contact­closing torque is produced by the uait whea the voltage applied to its terminals has a negative-phase sequence. Closiag torque for the relay forces the moviag coatact to the left hand side as viewed from the front of the relay. Contact­opening torque is produced when positive-phase sequence voltages are applied. Hence, the cylinder unit has restraint or operatiag torque as determined by the phase sequence of the voltages applied to its terminals.

Mechanically, the cylinder unit is composed of three basic components: a die- � cast aluminum frame and electromagnet, a moving element assembly, and a molded bridge.

The frame serves as the mounting structure for the magnetic core. The magnetic core which houses the lower pin bearing is secured to the frame by a spring and snap ring. This is an adjustable core Which has a .020 inch flat on oae side and is held in its adjusted position by the clamping action of two compressed springs . The bearing can be replaced, if necessary, without having to remove the magnetic core from the frame.

The electromagnet has two series-connected coils mounted diametrically opposite one another to excite each set of poles. Locating pins oa the electromagnet are used to accurately position the lower pin bearing, which is mounted on the frame, with respect to the upper pin bearing, which is threaded into the bridge. The electromagnet is permanently secured to the frame and can not be separated from the frame.

The moving element assembly consists of a spiral spring, contact carrying member, and an aluminum cylinder assembled to a molded hub which holds the shaft. The hub to which the moving-contact arm is clamped has a wedge-and-cam coast�uction, to provide low-bounce contact action. A casual inspection of the assembly might lead one to think that the contact a�m bracket does not clamp oa the hub as tightly as it should. However, this adjustment is accurately made at the factory and is locked in place with a lock nut aad should not be changed.

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I. L. 41-497.2 Optimum contact action is obtained when a force of 7 to 9 grams pressure applied to the face of the moving contact will make the arm slip one-fourth of its total free travel. Free travel is the angle through which the hub will slip from the condition of reset to the point where the clamp projection begins to ride up oa the wedge. The free travel can vary between 150 to 20°.

The shaft has removable top and bottom jewel bearing. The shaft rides between the bottom pin bearing and the upper pin bearing which is adjusted to .025 inch from the top of the shaft bearing. The cylinder rotates in an air gap formed by the electromagnet and the magnetic core.

The bridge is secured to the electromagnet and the frame by two mounting screws. In addition to holding the upper pin bearing, the bridge is used for mounting the adjustable stationary contact housing. This stationary contact has .002 to .oo6 i�ch follow which is set at the factory by means of the adjusting screw. After the adjustment is made the screw is sealed in position with a material which flows around the threads and then solidifies. The stationary contact housing is held in position by a spring type clamp. The spring adjuster is located on the uaderside of the bridge and is attached to the moving contact arm by a spiral spring. The spring adjuster is also held in place by a spring type clamp.

When the contacts close, the electrical connection is made through the station­ary contact housing clamp, to the moving contact, through the spiral spring out to the spring adjuster clamp.

Timing Circuits

Bach of the two timing units is an encapsulated module that consists of aa R-c timing circuit, a zener diode for voltage sensing, and a transistorized ampli­fying circuit.

Voltage Regulator

Voltage regulator is a silicon zener type diode. It provides a constant voltage reference for timing circuits.

Telephone Relays

The telephone relay units TI, TA2, TA3, are fast operate types. In these relays an electromagnet attracts a right angle iron bracket which in turn operates a set of make and break contacts.

Pulsing Transformer

Pulsing transformer is designed to operate on the impulse from the initial build up of current in the tripping cirauit. The low resistance primary winding of the transformer is connected in series with tripping circuit. The secondary of transformer is connected to the operation indicators for Zone 1, 2, and 3. Selection of the proper operation indicator is controlled by timer contacts TA2, and TA3.

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Blocking Diodes

Diode Dl, is a medium power silicon type rectifer. Diode Dl is connected across the coil of the Tl relay. Its function is to provide a path for dissipation of the transi:nt energy released by the coil after any of the contacts controlling its operat1oa opens. Diodes D2 aad D3 function in a similar manner across the telephone relays T2X and T3X, located in the KD.XG-relays. Diodes D2 and D3 are zeaer type diodes.

Operation Iadicator Uait (OI)

Three operation indicator umite are used to indicate in which zone of protectioa the fault occurred. Zl iadicator is located in the upper left-hand corner, Z2 ia the upper right haad corner, and Z3 in the lower right hand coraer. The operatioa indicator unit is a small d-e operated clapper type device. A magnetic armature is attracted to the magnetic core upon energization of the uait. During this operation, two fiagers oa the armature deflect a spring located on the froat of the umit 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 cover.

Contact Switch Unit (cs) The d-e coatactor switch is a small clapper-type device similar in appearance to the operation indicators and is located in the upper right hand corner. A magaetic armature, to which leaf-spring mounted contacts are attached, is attracted to the magnetic core upon energization of the switch. When the switch clo•es, the moving contacts bridge two stationary contacts, completing the trip circuit to seal in around the contacts of the operating uaits in the system and to releave them from carrying all of the current. The front spring provides restraint for the armature and thus controls the pickup of the switch.

Operation

The relay is connected aad applied to the system as shown in Fig. 2. The distaace uait closes its contacts to permit tripping for ground faults in the direction of the protected line and opens its contacts to block tripping for grouad faults located behind the relay and for all phase faults not involving grouad. upoa occurrence of a single line to ground fault on the protected liae, the ratio discriminator in the KDOCG relay {RD) and the distance unit (Z ) close their contacts to operate the TI telephone relay which starts the timer operatioa. If the siagle phase to ground fault is located in Zone 1, the reactance uait operatioa completes the tripping circuit and the build up of trippiag current through the primary of the pulsing transformer will operate the operation indicator for Zoae 1. If the fault is located in the second or third zones, after preaet time delays, the telephone relays, TA2 and TA3 will switch the reach of the reactance unit to a Z2-reach aud later to a Z3-reach respectively. Simultaneously with switching the reach TA2 amd TA3 set up the Zone 2 and Zone 3 operation indicators for proper indication.

Time Uait Operation

There are two RC timing circuits, one for each zone.

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I. L. 41-49'7. 2 The RC timing circuit in Figure 3 delivers an iacreaaiag voltage to the seasiag zener diode {DZ2) . DZ2 breaks down at approximately 63% of the refereace voltage which is supplied by the voltage regulating zeaer diode DZ, the rate or voltage rise is determiaed by the resistance {RH2 or RH3) in series with timing capacitor. Therefore, the rheostat settiag of T2 or T3 directly determines the total time delay for Z2 and Z3 respectively.

When capacitor C charges to the voltage value E1 DZ2 breaks down to provide base drive for transistor TR2 causing it to conduct. Emitter current of TR2 provides base drive for transistor TRl. Transistor TRl conducts, energizing the outp•t relay. Resetting of the timer is initiated by the resetting of either the ratio discriminator or distance unit.

CHARACTERISTICS

The KDTG relay is available in 48, 1251 and 250 V. de. rating.

Distance Unit (Z)

The distance unit of the KDTG relay is:

1) Insensitive to line energizing transients and uaequal pole closing. The unit does not respond to Zero sequence quantities and is restrained by rated voltage during this non-tault period.

2) Inherently immune to incorrect polarization resulting from mutual inductioR.

3) Does not require Zero sequence current flow fo� operation and thus is appliqable for tr•nsformer terminations or taps Where the high side winding is delta connected.

4) Either open delta potential or low side voltage from the other aide of Wye-Delta bank can be utilized.

5) It responds to phase-to-phase, two�hase-to-ground and single phase-to­ground faults. The ratio discriminator is the KDXG relays prevents operation of the relay on phase-to-phase and two-phase-to-ground faults.

Tap Plate Markings

1.5 2.0 2. 5 3·5 5.0 7.0 10.0

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BURDEN DATA

Current Burden Table

Three Phase Current : 5 L:_75° Amperes

Potential Circuit Vln = 69L£0

TAP VA Sln'TING

1.5 .703

2.0 .833

2.5 .885

3.5 1.16

5.0 1.67

7.0 2.40

10.0 3.63 i

Potential Burden

PHASE A

s = 1 6.0 VA

s = 2 1.5 VA

s : 3 .70 VA

Timer Unit

Time Delay Range

PHASE 1 &

PHASE 3

VARS

.540

.640

.699

.983

1.48

2.18

3-30

WATTS

.451

·535

.547

.613

·758

1.01

1.53

PHASE B

9.7 VA

2.4 VA

1.2 VA

Zone 2: 0.1 sec. - 1.0 sec.

Zone 3: 0.5 sec. - 3.0 sec.

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PHASE 2

VA VARS

.882 .804

1.03 1.00

1.24 1.21

1.70 1.68

2.47 2.45

3.66 3.62

5·67 5.62

PHASE C

5.1 VA

1.25 VA

.65 VA

WATTS

-358

.249

.257

.207

·302

.446 .�·

·590

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Reset Time

TA2 aad TA3 Drop Out Time: 0.1 sec. or less TI - Drop Out Time: 0.06 sec. or less Timiug Capacitor: Discharges to less thaJL 1% of full voltage ia 0.015 sec.

Battery Drai:m.

48 125 V. D. C. V.D. C.

Noa-operatiag conditioa: 0 0 Operatiag Coadition

Timing Circuit a ad IJZl 53 MA 48 MA Tl 64 MA 64 MA

TXZ3 117 MA 117 MA

I. L. 41-497. 2

250 V.D.C.

0

35 MA 64 MA

117 Mit

Accuracy - Overall accuracy of the timer depeads upoa the repetitio• rate ot coJLsecutive timings, the supply voltage variatioa, and ambieJLt temperature chaages.

(1) Nominal Settiag

The first time delay, as measured with the test circuit showa ia Figure 4 takea at 25° c, and rated voltage (48, 125, or 250 V. D.C. ) , will be withia

!:. 3'/o. (2) Coasecutive Timiags

If coasecutive time checks are made at any give• settiag, the readiags decrease. This chaage of time delay is due to the "voltage recovery" of the timiag capacitor. Voltage recovery is a characteristic which all capacitors possess; it has been miJLimized by the selectioa of the timiJLg capacitor iJL the module. The amouat of chaage ia time delay depeads upo• the pause, or duratio• of capacitor discharge betweea timiags. If a pause of at least 3 secoads is observed betweea readiags, the tim.iag will repeat coasisteatly, so that the total spread between the highest aad lowest readings will be ao more thai � ot the settiag. If timiags are repeated, the decrease ia time delays will be betweea 3% aad 4% ia most cases. Ia ao case will this decrease be more thai 5% of the setting.

(3) Supply Voltage

Chaages oa supply voltage, between 80% aad llo% of JLomiJLal, cause time delay variatioas of no more thaa + 5 milliseconds for settings of .5 secoads or less, aad JLO more thai ! 1% for settiags above .5 SeCOJLds.

(4) Ambie•t Temperature

Chaages ia ambieat temperature cause chaJLges b. time del�. This variatioJL i• time delay is a direct fuactioa of capacitaace chaage with temperature. Typical variatioa of time delay with temperature is showa ia Figure 5·

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Characteristics

The characteristics of various elements of the timer are as follows:

TA 3 & TA2 Relay Units TI Relay Unit RT Resistor RTl Resistor DZl Zel!l.er Diode RH2 Rheostat RH3 Rheostat

48 Volts DC

125 Volts DC

2000 ohm 2000 ohm 750 ohm 750 ohm 350 ohm 2000 ohm

0 ohm 118o ohm 30 volts breakdown 10 watt

Adjustable 0-401000 ohms Adjustable 0-1001000 ohms

Blockiag Diodes Dl, D2, D3

250 Volts DC

2000 ohm 750 ohm

6300 ohm 3000 ohm

The diode Dl is type lN539· It is a low power silicoa rectifier. It has .75 amperes maximum curreat ratiag at 50°C, maximum reverse curreat at rated peak iaverse voltage of 300 volts is 10 microamperes at 50°C. Forward voltage drop at 1 amp instaataaeous at 25°C volts is less thaa 1 volt. The diodes D2 aad D3 are zeaer type 113051. 250 VDC relays have 2 1N305l Diodes coaaected ia series for every diode used oa 48 aad 125 V. D.C. rated relays.

Trippiag Circuit

The coatactor switch has a aomiul ratiag of 1 ampere. The burdea of the �, tripping circuit coasists of the d-e resistance of the coatactor switch aad the primary of the pulsiag traasfQrmer, aad is equal to .64 ohm de resistaace. Siace operatioa of the pulsiag traasformer depends oa the rate of change of curreat which depeads oa iaducta•ce of the trippillg path, it is recolllllleaded that the iaductaace of the trippiag path for circuits with 4 amperes of fiaal curreat should aot exceed 2.8 Hearys. For larger fiaal curreats, the iaductaace limitiag value ia much higher. Usually the inductaace of a typical trippiag coil varies betweea .028 aad .250 Hearya. The trippiag circuit of the KDTG relay should aot be shuated by le•s thaa 100 ohms of d.c. resistaace.

SETTINGS

Diataace Uait

The distaace uait requires settiag. For each compeasator (TAB, T]c) aad each auto traasformer (SA, Sc). All of these settings are made with taps oa the tap plate.

Compeasator (TA, TB, Tc)

�ach set of compeasator tapa termiaate ia iaserts which are grouped oa a socket aad form approximately three quarters of c circle arouad a ceater iasert which is the commoa conaectioa for all of the taps. Electrical coaaectioas betweea commoa iasert aad tap iaserts are made with a liak that is held ia place with two coaaector screws, one ia the commoa aad oae ia the tap. There are two Ta s�t+.i•ss to be made siJtce phase B curreat is passed through two compeasatora. A compeasator tap settiag is made by loose:m.iag the coaaector screw ia the ceater.

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I. L. 41-497. 2 Remove the coaaector screw in the tap end of the link, swi�g the link around until it is in position over the insert for the desired tap setting, replace the coaaector screw to bind the link to this insert, and retighten the coanector screw ia the center. Siace the link aad connector screws carry operating current, be sure that the screws are turned to bind snugly.

Auto-Transformer Primary (SA and Sc)

Primary tap connectioas are made through a single lead for each transformer. The lead comes out of the tap plate through a small bole located just below or above the taps and is held ia place on the tap by a connector screw.

Aa "S" settiag is made by removing the conector screw, placing the coan.ector is position over the insert of the desired setting, replacing and tightening the coaaector screw. The coaaector should never make electrical conta�+, with more than oae tap at a time.

Settiag CAlculatio�s

The recommended setting for the relay is 30 ohms for maximum sensitivity. To make this setting campeasators TA, TB (two settings), aad Tc are set for T = 10 aad SA aad Sc are set for S : 3. Make sure 30 ohms is larger thaa three times the Zone 3 reactance unit setting of the KDXG relay. If any other setting is desired it should be made equal to at least 3 times the positive sequence impedaace of the third Zone setting of the reactance uait in the KDXG relay. Oace the desired setting Z : 3Z1� is established where Z13 • positive sequence impeadaace of Zoae 3 setting of the KDXG relay.

Use the followiag procedure:

Step 1.

Step 2.

Select the lowest S which gives a product of lOS greater than Z as established above.

Select a T • settiag that is equal to Z or the next highest value. s

For Bxample:

Refer to KDXG I.L. 41-496 page 14 where Zoae 3 positive sequence aace X1 = 2. 58 ohms, beace for 75°-liae z13 • 2. 58 : 2. 66 ohms.

S:ia 75° desired distance uait setting Z : JZ13 = (3) (2. 66) = 7. 98 ohms iag the procedure outliaed above.

Choice A: Set relay for S = 3 T = 10 ohms for maximum sensitivity or

react­The

follow-

Choice B: This settiag is made if the Choice A is uaacceptable for special applicatioas. Use procedure as outlined above startiag with Step 1.

Step 1. Siace Z � 7.98 ohms S = l gives product lOS = 10 greater than 7.98 ohms.

Step :!. T-setting is selected as Z • 7.8: 7. 8 aad the aext higher setting is 10 s 1

beace, relay is set at SA = Sc • 1 and TA • TB : Tc : 10

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Timer

Proper time delay is selected by turning the knobs of rheostats RH2 and RH3 to the desired setting. Zone 2 time should always be set less than zone 3 time. An operation of Z3 prior to Z2 will result in the autotransformer and TXZ3 switching relay contacts in the KDXG relays being momentarily overloaded. This will shorten the life of both.

INSTALLATION

The relays should be mounted on switchboard panels or their equivalent ia a location free from moisture. 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 for steel 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.

ADJUSTMENT AND MAINTENANCE

The proper adjustments to insure correct operation of this relay has been made at the factory and should not be disturbed after receipt by the customer. Do not remove the knobs on the RH2 and RH3 rheostats unless the rheostats are to be replaced as this will upset the relay calibration.

A CCEPTANCE TESTS

Distance UJtits

Check the electrical response of the relay by using the test connections in Figure 6. Set TA, both TB, & Tc for 10.0 S, SA & Sc for 3·

A. Use connection for Test No. 5

B. Adjust the voltage between PH.l and lF and between PH�2 and 2F for 15 volts each so that the resultant voltage VlF2F equals 90 volts (120-15-15 : 90V)

C. The current required to make the contacts close for the phase to phase (top) unit should be between 1.45 and 1.55 amperes at an angle of 75° current lag.

D. Repeat C while using connections for Test No. 6 aad Test No. 7

Timer Unit

A timing check at various settings is recommended using test circuit of Figure 4.

Contactor Switch

Energize the contactor switch between termir�ls ll and 10 With sufficient

current to pick up the contactor switch. It should occur between the 1.0 aad 1.2 amp D.C.

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I. L. 41-497. 2 Operatioa Indicator Test

Emergize the pulsing transformer between terminals 11 and 10 through a switch with 0.7 amperes of D.C. current suddenly applied. The operation indicator marked "1" should operate after closing the switch. It will not operate whe:m current is iacreased gradually. Close armature of TA2 relay manually, and operate reclose switch, again operation indicator marked "2" should operate. Operate TA2 and TA3 relay closed - reclose switch again operation indicator marked "3" should operate.

ROUTINE MAINTENANCE

All contacts should be cleaned periodically. A contact burnisher S#l82A836H01 is recommemded for this purpose. The use of abrasive material for cleaning coatacts is not recommended, because of the danger of embedding small particles in the face of the soft silver and thus impairing the contact.

CALIBRATION

Use the followimg procedure for calibrating the relay if the relay has beea takea apart for repairs or the adjustments have been disturbed. This procedure should not be used unless it is apparent that the relay is not in proper work­ing order (See "Acceptaace Check").

I. Insulation Test

1. Place jumpers across all diodes.

2. Con:Rect ", erminals iR.to following groups.

Group 1 - 1, 10, 11, 20 Group 2 - 18, 19 Group 3 - 2, 3 Group 4 - 7, 8, 9 Group 5 - 12, 13, 14, 15, 16, 17 Group 6 - 6, 19

3. Apply 1000 volts, 60 cps for one second from Group 5 to Group 6. Apply 2000 volts a.c., 60 cps for one second from all groups, and from group to group, as noted above.

Distance Unit

Use the following procedure for calibrating the relay if the relay has been taken apart for repairs or the adjustments disturbed.

Connect the relay for testing as shown in Figure 6. The four-pole-double­throw switch shown in the test circuit selects the type of voltage condition, for a phase-to-phase or a three-phase fault, that will be applied to the relay voltage terminals. The rotary switch switches the fault voltage to various terminals and thereby simulates any combination of phase-to-phase faults without the tester having to change connections or readjust the phase shifter and variable auto-transformers.

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For best results in checking calibration, the relay should be allowed to warm up for approximately one hour at rated voltage. Ho�ever, a cold relay check to withia two percent of the warm relay.

Tripping Units

With the stationary contact open so that the moving contact cannot touch, set the moving contact spring adjuster so that the contact floats freely in the gap. Make sure that there is no friction which prevents free movement of the cyliader and coatact arm.

The upper pin bearing should be screwed down until there is approximately .025 inch (one complete turn of the screw) between it and the top of the shaft beariag. The upper pin bearing should then be securely locked in position with the lock nut. The lower bearing position is fixed and cannot be adjusted.

Autotransformer Check

Auto-transformers may be checked for turns ratio and polarity by using the No. 2 test connections of Figure 6, and the procedure outlined below. (No curreat applied).

Set SA, and Sc on tap aumber 3. Adjust the voltages v1F2F and V2F3F for 90 volts. Measure the voltage from terminal 8 to the #1 tap or-SA. It should be 30 volts. From 8 to the #2 tap of SA should be 60 volts. The voltage should read 30 volts from 8 to Sc • 1 and 60 volts from 8 to Sc • 2.

Distance Unit Settings

Check to see that the taps on front of the tap block are set as follows:

TA, TB, and Tc set on 7.0 (Tap TB is set twice)

SA, and Sc set on 1

A) Single Phase Test

1. Set RAe - Resistor (second from the bottom - rear view, next to subbase) so that the adjustable band is in the center of the resistor.

2. ��en circuit R2c - Resistor (bottom - rear view) by removing leads going to the adjustable band.

3. Repeat the same for R2A - resistor. (second from bottom - rear view)

4. Connect terminals "7" aad "8" together. Apply rated A-c voltage (120 volts) between termin,.ls "8" and "9"· Adjust core UD.ti1 contact floats in the middle of the contact gap.

5. Connect terminals 8 and 9 together and apply rated A-c voltage betweea terminals 7 and 8 and adjust core until the contact arm floats or is restrained only, slight core adjustment should be needed to do that. If this is not possible, rotate core 180° and adjust.

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I. L. 41-497. 2

6. Colil.n.ect terminals "7" and n9" together. Apply rated A...t:- voltage to terminals 7 a�d 8. Adjust RAe until contact just floats.

Maximum Torque Angle Adjustment (Fig. 6)

1. Use the No. 2 Test switch position and lead conJil.ections. This connection. is for checking and adjusting the maximum torque angle of �he TAB compea­sator.

2. Adjust the voltage V1F2F and v2F3F for 52 volts with Brush No. 1 and Brush No. 2 respectively.

3. Adjust the current to 8.5 amperes and rotate the phase shifter to find two angles, Ql and Q2, at which the top unit contacts just close. The maximum torque angle Q for the phase-to-phase unit then is (Ql + Q2 - 30)

2 degrees. Adjust R2A until maximum torque Q - is 750.

4. Use No. 4 Test Connections and repeat above procedure to check and adjust the angle of T compensator. For 75° maximum torque angle. This adjustment is �de with R2C - resistor (bottom resistor - rear view)

5. Recheck part 3, if necessary readjust R2A

6 . Recheck part 4 if part 5 required a readjustmeat.

Co•tact Adjustment

With moving-contact arm against right-hand backstop, screv the stationary coatact in until it just touches the moving contact. (Check for coatact by using aa indicator lamp.) Then back the left-hand contact out two-thirds (2/3) of oae turn to give 0.020-inch gap between contacts.

Impeda•ce Curve Check

Usiag the comaections for Tests the current lags voltage by Q0• phase uait should be within the Note that for distance unit the

Nos. 5, 6 and 7, set the phase shifter so that The current required to trip the phase-to­

limits specified for each of the voltages. impedance measured by the relay is � : vL ... L

where VL� is phase-to-phase fault voltage and IL is phase current. 2IL

Test Volts Amperes (Q = 75°)

No. VJ.F2F lmin �X 5.0 ·334 -375

5, 6 & 7 30.0 2.08 2.20

70.0 4.85 5.16

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Spring Restraint (Fig. 6)

1. Use Test No. 1 connections except reverse the voltage phase sequence by interchanging the Brush connections so that Brush 1 is connected to 3F and Brush 2 is connected to lF.

2. Adjust the voltage VlF2F and V2F3E for 4.5 volts each with Brush No. 2 and Brush No. 1 respectively. Position the moving-contact spring adjuster so that the contact just floats and then return the circuit connections to normal with Brush 1 to lF and Brush 2 to 3F.

CS Test (R.H. Top )

Check con.tact gap. It should be 5/64" + 0 - 1/64". Pick up must !lOt be less than 1.0 amp d.c. nor greater than 1.2 amperes suddenly applied. To increase pickup current, bend the springs out, or away from the cover. To decrease the pickup current, bend the springs toward the cover.

Operation Indicator Test

1. EDergize CS with 0.5 amp d.c. cur�ent through a S.P.S.T. switch. After switch is closed unit with target :marked "1" should operate. To incJ.·ease or decrease o.I. pickup, adjust the spring the same way as for c.s. described above. Repeat the pickup check of the indica­tor five times.

2. Block telephone relay TA2 closed. Energize CS again through the switch. The Wllit marked "2n should operate. Adjust spriJI.g if aecess­ary for correct pickup.

3. Block telephone relays TA2 and TA3 closed. Energize CS again through the switch. The unit marked "3" should operate. Adjust spring if' necessary f'or correct pickup.

It should be noted that if polarity of the d.c. supply has been reversed, oa the first try operation indicator may operate on much lower current. Hence, operate the operational indicators several times before making fimal adjustment. The same may be true if the operatiomal indicator has not been operated for a long time -- on the first try it may pickup at much lower current. Heace, try pickup several times.

Timer UB.its

Trouble Shooting Procedures

Use the following procedure to locate the source of trouble if the timer is not operating properly.

1. Apply rated voltage between reJ.ay termb.als 2 and 3 and check TI contact operation.

2. Check reference voltage circuit. This is done by measuring voltage across zener diode DZl mounted on a large metal bracket behind operation indicator marked "1". This voltage should be zero before Tl operates, and between 27 and 32 volts d.c. after Tl has operated.

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I. L. 41-:-497. 2 3. Check rheostats RHl and RH2, and TA2 and TA3 relays with an ohmeter.

The RH-2 should measure from 0 to 4o,ooo ohms and the RH-3 should measure 0-100,000 ohms.

4. If the above checks do not determine the cource of trouble, eithe� the wiring or the module, M, is faulty.

Calibration

Use the following procedure for calibrating the timer if the relay adjustments have been disturbed. This procedure should not be used until it is apparent that the timer is not in proper working order. Before calibrating, follow the Trouble Shooting Procedure to locate the source of trouble.

1. Telephone Relay Adjustme111.t

Adjust the armature gap on the three telephone type relays to be approximately .004" with the armature closed. This is done with the armature set-screw and lock-nut. Also, adjust contact leaf springs to obtaiR. at least .015" gap on all contacts and at least .010" follow Oll all aormally open co�a.tacts and at least .005" follow on all normally closed contacts.

2. Rheostat Knob Adjustment, Same Scale Plate

If it is necessary to replace the RH2 or RH3 rheostats the relay may be recalibrated with the same scale plate. This is done by rotatillg the shaft, without knob, until a 1.0 second delay is measured for RH2 or a .5 second delay is measured for RH3. Then, aligh the knob for this delay and tighten the knob set-screw securely. There should be a pause of several seconds between readings for all time delays above .5 seconds. See section under Accuracy for discussion of this.

3. Scale Plate Calibration, New Scale Plate

If it is necessary to replace the silicon power regulator (DZl) , or the modules (M) , the relay should be recalibrated with a new scale plate. The first step should be to insure that the knob is approximately vertical for the midscale time delay (.550 seconds for T2 and 1.75 for T3) . This will locate the calibration lines symmetrically around the scale plate. After centering and securely locking the knob on the rheostat shaft, new calibration lines may be marked on the scale plate. When scribing calibration. lines for delays above .5 seconds, there should be a pause of at least 3 seconds between readings. See section under Accuracy for discussion of this.

Breakdown Voltage for 48/125 v. D.C. Relays

Apply D.C. voltage source with 10,000 ohm resistor in series with terminals 4 and 6 with positive on 4. Measure the leakage current with a d-e milliammeter. Start with 100 volts d.c. and increase voltage until current exceeds 0.25 milliamps and starts to increase rapidly. Do not exceed 3 MA. The voltage at which current exceeds .25 MA should be between 60 a�i 240 volts. Repeat the same test for terminals 5 and 6, except connect positive to terminal 5.

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Leakage Current for 250 V. D.C. Relays

The same test o.s above except breakdo-vm voltage should be between 320 and 480 volts.

Rene-vm.l Parts

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

RESISTOR VALVES IN OHMS

VOLTS 0-C RT RTt

TWO IN SERIES FOR 2SOY;D.C.

INTERNAL SCHEMATIC r3 I2 r1

V2 V3

CHASSIS OPERATED --+--- SHORTING SWITCH

CURRENT TEST JACK

AIR GAP TRANSFORMER (PRIMARY)

OOOD

CONTACTOR SWITCH

OPERATION INDICATORS

Z3 LOWER R.H.

Dl S'UNCE 1M IT

AIR GAP TRANSFORMER (SECONDARY)

...,----+-RED HANDLE

TEST SWITCH

TERMINAL

836A716

Fig. 1 Internal Schematic of the Type KDTG Relay.

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"%j ....... CIQ

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ttj � ('0 ., � ..... en n ::r ('0 s � � ....... n 0 1-+> � ::r ('0 1-3

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00 c.o c.o (J ...... 1.\:l �-

STATION BUS PHASE ROTATION I, 2, 3

·{ PH. 2

PH. 3

OT ll 21 I SEC 19.--------------------,20

PHASE 2 SAME AS PHASE I

PHASE 3 SAME AS PHASE I

r

OT SEC

RATIO DISCRIMINATOR CONTROL 21 i3 21 i2 21 IT 21 TB

21 i3 21 i2 21 IT 21 iB

••c

V I V 2 V3 V N

}" }·: }·;

PHASE I � PHASE 2 � �� � TL X OT � ����--�---4� ���----------------------�

r1

¥.f PRI. PRL # rL x or �

ill PRi. PRi. � Ut 16 "

I 2 3

OON ---.-- ITH SON .--- 21X 2 21X T

Io•i � RESIDUAL CURRENT fROM

PARALLEL LINE FOR COito4PENSAT10N IF USED

CONTROL CIRCUIT

POS�i • 32T .JZI..

\9 18

ATI RT TA2rl TA3

c1 OZI

?3!T

NEG.

POS.

.- -'- _ _ _l_ __ l_l ' ' : TIMING 1 1 CIRCUIT 1 I Z2 I Lr�---r TIMING

CIRCUIT ' l3 LI� TRIP CIRCUIT

�3�T

NEG.--------<1�---------+-

�f��T

03 ID2

DEVICE NUMIERS DEVICE 1110

21 TYPE KoxG RELA-,----21X AUX. CURRENT TRANSFORMER 32T TYPE KOTG RELAY SON TYPE ITH RELAY 52 CIRCUIT BREAKER

Cl BREAKER AUX. CONTACT TC tiREAKER TRIP COIL

i" - OPTIONAL- fOR SUPLEMENTING RATIO 01 DISCRIMINATOR

tt �NOTE THESE EXTERNAL CONNECTIONS BETWEEN RELAYS

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TIMER CONTROL CIRCUIT POS.--

---------------------.-----------------

RH2

NEG.----_.-----------------------------------

Fig. 3 Module Schematic of the Type KDTG Relay

POS NEG.

@) 18 T+ @ @ ® @)

L�ZI �

TI

RT

RH2 e �H3 e I MODULE I I MODULE I ZONE 21 #ZONE 31 Tl Tl � "'1"'1"

@ @ ® KDTG RELAY

(FRONT VIEW)

8 ;. ·l J (• 0 0 ® ® I I I I I

D.RS.Tl ' I I I l_!_:

TI"'ER

STOP

qTART

J t • CONNECT TO TERMINAL 4 FOR TA2 TEST

CONNECT TO TERMINAL 5 FOR TA3 TEST

185A516

849Al93

Fig. 4 Timer Test Connection Circuit for the Type KDTG Relay

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w LLO o;i

(!) 1- ..... -z wz ow a::O Wo ll..lt)

C\1 z .....

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110

108

106

104

102

100 --

98 ---

96

94

92

90 _,

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UPPER LIMIT, TYPICAL A PPROXIMATE-h CURVE \ / v

_1 ---f-- / - - I--f.--

---� ::--:: - T f--- ' - ·-�·· I - - ----

r-- ---- ------ - - T

-LOWER LIMIT, u A�_PROXIMATE-

�- --

--

-i

l -10 0 10 20 30 40 50 60 70

AMBIENT TEMPERATURE, IN DEGREES CENTIGRADE

185A171

Fig. 5 Timing Variation with Temperature for the Type KDTG Relay.

PUll IOUTIOI 11- 21 - ,JI ,. ___________________ _ ··---+--+--.-----------­,·----j-+--+--+------------ .. '·==:;::=====+=

rt. I �· ' •..

1·1 Jl �

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IOTAIY •1 TCI

SUIJtAC T 10• flO.. THE 'HUE •AIIIL.E·Mf. TEl

IUOIIUi TO DETEIMI•t

THE IELU MAXIMUM TOI�E UGLl lfMEI TIE SELiC TOl

1$ Ui TME J- 1'051TIDI.

TUT mEt� 10. $I !Ttl

2 l •

• ] 4 +-_ ... �� .... 7 ...

AULT TEST S

-2

1-2 2-J -I

ll 1 $ 15

TO tMECI COllEtT flfiii/TO 01 .,.,UST

I 23/U �2/al ... '= �1./21

I:W£<1 2l ll 1/11 CH'CK 21 IS Z2/17

tii[CI 2ld7 U/t:

Fig. 6 Distance Unit Test Circuit for Type KDTG Relay.

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TEAM IIIAL. AMO MOUIITIIIG DETAil.S

TEAM I MAL N1148EI!

j 2� 2

-t-s! .... h, 16 - DIA.II HOLES FOI! II .19o-32 MTG. SCREWS 1-i- ......---32

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!::

! �t/ -t-6

7 - s�---.,. 8 PAMEL CUTOUT & DRILLiNG FOI! SEMI-FLUSH MTG.

PANEL-DRILLING OR CUTOUT FOR PROJECTION I-1TG.

lfBQ!L VIEW)

_,,. en •

I ;

3 - DU.20 HOLES II 01! CUT OUT

9 - DIA.2 HOLES 16

Fig. 7 Outline-Drilling Plan for the Type KDTG Relay in the FT -42 Case.

WESTINGHOUSE ELECTRIC CORPORATION RELAY·INSTRUMENT DIVISION NEWARK, N. J.

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'J'he movi.n::; ele;��c:n'L as;_·.c_:;,:':J}y co:1s:i.sts o: a spiral sprln[.;, n contact carr·y:i.ns meu':Jc:r, en-! an aJurdn�:_;l cylj_ndcr c.:..�scriiblcd to c.:: molded hub \'ihich hoJ.Js tl':: :._:fi'-.lt-:. The sl·uft hzts rc�110vable top :::.rtd bottom je·,·wl bcc:,rin[�', rlh·�- s!:z,S"'L ridef_; b2'L\·iCC'!l tlJ;; bot.to�.1 pin bcarine; and the up;� .. :::r p}l< bc-arln;:.c v:i tl1 the cylinder rotatinG in an air g:J p for:::•:"(: by t.};c e J•..:c t.r•or::az,t:c t ct nc1 the i;dcne VLc; core.

The bridg� is sec:�_rc�' to tll':' elec:tr·o:·n.:::;,cnct and frar;ie b:l' t:·:o mount lnG [_;are .-;;3 . - Ir. n-:<:J U ·o:, to ho lcJ.ln: the· upper ty:Ln Lcarint;, the br:Ldgc j_s used for r::ou�l'l.:.j_'<-� Flc c.�1jtcstc:':.11C stc-;t:i.on.::-,:cy contuct hous1ns. r:J.'hc· st.2.ti.:.·Y,�,;,:.:·�: c-:):��--�·.ct hou:;j:::�: is h·:::ld j_n posi t:i.on b:'.l a spring tvp2 c l<:·.rr.:J. 'l'Lc s t•J:':: r1:c- ad_i ur. te r :Ls loc.o. 'cc<l o:i the undcr:-:,5.6c O.r· the b·r··irirr-·:. ;i''l�-, is ::J+-�-<��.:- . .-:.-1�'to n�1e n'"\;l''lr·· CO''l�-.,ct "'""' by a co·i·�---1 J. _.�... 1.....'-(..) L <.: ... l u . c ... v .... �,. '· ... ...... .... . · u . d'-' 'Q " vc.;. c ...... •.l u� - ·' �--

spr:ln[;. Tile spr1ng <J.ci j u:::-.,:.2 is &lso hc?J.cl in place by a sprins t:,'p::: clari'lp. vJith the co:�,t�:.ct:-: clc.):::s-::-1, tLe elccti·ic-:::1 cormec:tion is c::-:.(:c thrcugh the st.3.tiNic.·':>' co:;',.·.:: .·�. hr_,usjns clc::::1p, to tl!c> movir.:� co;·,�:.:-:.c'..,, thJ'OU.i�.,...,. t•··c Sr)'r"-'1 �-,-. . ,·•v,:· c,··' to "'l·Jc S'!�'l' nr· """1'1L'<�tnr- Clc:.�·rr'.fl, �;-- ! J - j � t aJ- -- v. ....l. .:'I L I J ..1.. ... �,.:,... _, "' v.. t ..l I. � c.: .. \,.A.. � .(. ,_, • ...... ,..

'1·}-Je poJ.ariz:i.n:; :1et.�-:rJ::-·�-: 5.s d:;signcd r.o th:-:t a polal'izine; volt:;:.c<:..' ana, " pOl'•"�/.�J··�:- C"�v-_- --,->- r-:: -.- hot·\� l:J-:-. 'l�.,--,•-;�.-1 -'-o t�-JC' opel-'"''-jnr;· LP1�1 0. C.-. J . .1.. -J • .1. "V v . .J.. .I. � ... _, • .... . ,, L • .,.; t,:; C t-· � .... ..�o..-... � .... '....<. V v! c ... V ... • J C.'� ·• - ....,

eith•-::r inr.::_e(jcr;ckntly C:." [:::_r:�'Jt:lnc.:o�.i.::;ly v:ithoui.·, one &ffcctins; the othc::--. Encrg:- fror11 th·::: .,cL�-�'.f',:::r�t po12Ti'�jtJ.g source is intrN1t: .. .;ccl b�­m�a:;s of an a·: r g;-:;J t.:rc-�::: ;··c:o: :�·cr ·.-;hile th':: encrt_;;-� fro:n the volta[/-' p8la.rjztnr; ci!··cu.it is c.r.;r:<'_:_:c; .::Ec'.:::ctl/ to the: voltac�cj circu:..t. Ass oc ia te c 2..f: .1.(; ::. "[,(; �C"J r' l'C;-l � �o:r·s J C! �'"'l c! re s�i s � 0 l··s s e r\TS <:� f�� imt)ec!a nc (• bala.ncins elE:·mc.:n-;-.s o:� c. br5.:.::::::: t..ype: net\-.'o::-"::.

Tl..ITll·n..,. Cl'rcu-t•c· ---·-�_�(:) _ __ __L v-::_ . '

Each of the: b:o tir;;5 n2; uni t:s :!_s an �ncapsu.la ted module that - consL:.:t:,;· ··:)f an R-C tiJ:-lin(:; cil'CU�_ t,- a zener diocle for voltage sensing,

and a tra t1S is to::·i zed ;�::::) lify inc c i ::·cui t.

Volta[:.::: rcculc:�tol' is a s ilicon zener ty9.::: diode. a const::\nt voJt2.=;e r..:fs::-'c::.ce for t1.r.lin.::; circuils.

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The t e l e p h o ne re ls. y un i t :.> r.l' I , 'l1.C\ �� , TA 3 a re fa s t op e r ::l t e 1::,- r e s . In the .s 2 rc l s y s a n e lc c t ror.� -� C L •2 t a t. t :r ·r: c t s a r i·g,h t a ns l e i ron . b ra c ke t Vlh i. c h in t L: ni D["I Cc' r-E, ·L: c .::; a s e t o f m01ke and b re ak c on t a c t s .

P u l s i nr; t ra n :::: f o }··i.;e r" i s dc � d [: t 1 e d t o op c rc:. t e on the imp u J s e from t h e i n i t i2. l r m i lcl u : ' o i c u. r r e n t i n t h e t r :l p p i nr; c i rc u :i. t . The l ot.·: rc s i s L1. nc e p l'J r;•2.. ry ; : j_n c� i nc; o f' t h e t rct l1 G f' O l'l.i::? r i s c onne c t e d _i n s e rJ e s v; i th t 1 'l p p j r 1 � e :I I·c L�:-. t . '}'i·J c s e c: o :1 cla r�' o f t ra n s f o rme r i n c orll1f' C te d t o t!1 e o p 0 l\s. 'c :i. o n :Lnc1 i c a t c r :_; f o r Z o ne l , 2 , a nd 3 . Se l e e t i on o f t h : p r o;; e r o r· c r.:: t :l o n . j neU e a t o r i s c on t ro l lE: d by t ime r c o n t a c t s TA ? , a �d TA 3 . B l o c ld nz D i. o·��. c 5

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D i od e s Dl , D2 , a nd D3 c. rc 10.s d i u::1 p ot! c r s i l i c on type re c t i f i e rs . D i ode D l i s c o� m �: c t -: d c:, c ,-· o ;� �; t !1 c c e: 2- l D f. t h e TJ rc l:"; y , I t s f unc 'c :l. o n i n t o p c-:'ov :t d c a p.co, t h f o i e ll ;:; s i p o: t 1 o:1 o f t h e t ra n s l e n t e n c rc;J re l ea "-' e � r v tr. � �· o 1 l ::o -f' l- ,-.. -,-. " '1' . o f t ' J ' ' ,... on � ,.., ,... i _ ,., C Ol• t ��o l 1 "� 11 '" . � t <:; .... J \. .(. .... ) ,) J_ ' "·' v . �. p ......... .l. l> \.. � ... CJ.. I ..,.": ..... • • - - . . ..... �.I. v �- _l ... .l .1. -- "'J J_, • L.

op e r� t ion o p e ra s . D i od s L D2 2 n1 D3 f un 8 t i on in a s i�i la r m a n n a r a c r o s s tf1 e tsl e;� !-� o t1e rc: l0 �.r � T2):. 8. t1cl r�r3X , l oc a t e c1 1!1 t !"Je 1\.DJ:G - rc lr.:ty s .

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T:n'8 C op e l'0 '.: :i . on i c c1 :1 u, t o :r' u n l t :: c. rc u ::: e c'! t o i n d ic a te· i n \·: h ic h 'z o r i e o :' p :c- J 1... .;; c t 5 o :• t � 1 c� f z. •J J t c :: , ;_; : ' l t.:· •:' . Z J :Ln d i c a t o �' i s l o c a te d j_n t }l e l l� � (:- ):"' 1e f t -!'-J c·l c. :� C O J\· �� · ::. ·· : z =: i rt t ll (' lc),:,' c ::: · le f� t - [J �1. l.1Cl. C CI Y'i"1 C l� , & t":t :l '7 3 l. rl the 1 .... - . . c Y' . 0 ]' r } l- h - ' ' ( � (' 0 l"' . . -. ·r, 'I'n ,., 0- . ' ' . . t .• 0 ·,- l' l.., r} ]"' c :-, t 0 r u r� ·i t I..J � .... . ; � •• .!. - '-'' - 1 l' " -� • .. . ' . l • - - • . ,. i l L: .c .::: .• J. d 1' . . < . 1...

! s a � :-.1:J. l "J. 0. -c o l ; t: :· cd .. ·� c\.. c :l 2c [) �> C' l ' ty p e d :: .,- j c c . 1\ lrc. ��ne t j_ c a rm":'1 t u rc: l s ::. 1: t r& C' tc 1 t o t l-vo r' ,'. [: � : :� t 5. � c o ?' c u. p c n e n..: � ('; i � a t :'c. 0 : 1 o f' t h e· U l} 1. -'..; , Durl:--:[� t �i J. �� o r� c !· {-� t �_ o t � .� � . . -.� �. -�- � � : c��.c ::·s 0 �1 t- ! !e C i_"'i �: :l t L: r·c c1 e i· l o c t. a S p l-·ir,.[_� loc. 2. t. E· :': o;-� t. h :c f' r o: , t. o f t L r u :-: :: . t •:: !; �_ c h _ a J J o·;·�, the ct"l e rz, V L Oi': ind i ::; r.:. -::, o r t o. r;c� t, � o chc c' >' · r:r· r·· c � 2. ::.·t:;C' t i s :r ·: :� c t , f' rc�, t h e o u t s 1c1 e o : t he .: a :-; e t y a p:_1 .� �1 r · o ::1 :t o �; :� t •.c· �1 2 t t h :::· b o t t o�:1 o f t h e: c o v t:� r· .

Th� d - e c o� t � � t j r s � i t c h i s a s �a l l c l � p p e r - type · ct e v i c e s imi la r in a p p c .::. ::'�t�c e t o E• e o n c' l�'-� t i or: i nd i c 2: t o rs a nd i s l o c a t e d in t h e

. . . up p e r rl[,}!t; h x:1d c o rn(' r' . A m:::t r;n c t i c c. rL'a. t u r.::: , t o •,:h i c h l e a f - s p r lnt; moun�c d c c n t � 8 t s a rc a t t � c h c d , i s a t t ra c t e d to th2 ma gne t i c c o re u p o n ene ·cc:; l 7: a t .l. o ,1 o .f. t h e s ·.-; i t c h . 11! l 1 2 n t h e s ;•l i t c h c 1 o �: c :::; , t h e mov i nc c o �l t :'. ,� t .s b 1 : � .. dz,-::: \.,'. : :) s -'c ::. 'c i o :·,-:: ry c c r: -'c J c t s , c o:-np le t ing t h e t r i p c i rc u i t -'c o s c :1 l i n a :::' rx: : :'�l t h e c o�-1 L.:. c t s o f t h '? o p e r::.:. t i ns u n i t s i n t h e s :,· :; t e � . a nd t o ro le: a v c· t h: :.i f :co!.1 c z� r r :; l r.,c a 1 1 o f t h 2 c urre nt . '

'l'he f :c on t s p r i n ::::; p rov i d e: ;:; rE:: �: t l':·J. i n t f o r t h e a r: :-�a t ure a nd thus c o n t r o l s · t hc p i c k u� o f t h 2 s w i t c h . 1

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