Westinghouse KRD-4 Installation, Operation, & Maintenance Instruction Download Page 114

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Summary of Contents for KRD-4

Page 1: ...PERSEDES I L 41 l37 3C Denotes chan ge from superseded issue The cylinder unit consists of three basic assem blies an electromagnet assembly a moving element assembly and a stationary closing assembly The electromagnet assembly consists of an elec tromagnet an adjustable magnetic core two magnetic adjusting plugs lower bearing pin and a die casted aluminum frame The moving element assembly con sis...

Page 2: ...L OVERCURRENT GROUND RELAY DECOU PLER TRANSFORMER Fig 1 Type KRD 4 Relay Front View OVERCU RR ENT UNIT OVERCUR RENT TAP BLOCK Dl RECTIONAL UNIT INDICATING CONTACTO R SWI TCH w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 3: ...______________________________________________________ L 4 1 13 7 3 o Fig 2 Type KRD 4 Relay Rear View __ POLARIZING REACTOR SATURATING TRANSFORM ER 1 VARISTOR SATURABL E SHUNT DECOUPLER CAPACITOR 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 4: ...d to the pro tected transmission line as shown in Fig 4 In such a connection the relay operates to disconnect the line for ground faults of a definite magnitude that are flowing in a specified direction 4 The directional unit of the relay compares the phase angle between the fault current and the polari zing quantities of the system and either produces a contact closing torque for faults in the tr...

Page 5: ...les of pickup 3 6 0 5 Entering the curve in Fig 6 at multiples of pickup equal to 6 the closing tim e for the overcurrent is 14 ms However the total operating time for the overcurrent unit is 14 plus 4 ms which is the opening time of back contacts of the directional unit or 18 ms total operating time for the overcurrent unit The total operating time for the directional unit is 33 ms and since this...

Page 6: ...Ttl OIHCTIOIAL n U IT lEO IAIIIU TUT ITCI c l ll TUT IAa ff IIAL 629A509 Fig 3 Internal Schematic of the Type K RD 4 Relay in the Type FT3 1 Case 6 TABL E I I DIR ECTIONAL UNIT CALI B RATION I n t 1 Adjustment All Ranges ious torque in Right front view I tact closing direction Plug Screwed out left front view until spurious tor I que is reversed All Ranges 8 0 lspurious torqu in j Left front view ...

Page 7: ...ay at the opposite end of the line CAUTION Since the tap block connector screw car ries operating current be sure that the screw is turned tight In order to avoid opening the current transformer circuits when changing taps under load connect the spare tap screw in the desired tap position before removing the other tap screw from the original tap position ENERGY REQUIREMENTS BURDEN DATA OF OPERATIN...

Page 8: ...d then turning the proper nut with a wrench For detailed information refer to I L 4 1 076 A D J U S T M E N T S A N D M A I N T E N A N C E The proper adjustments to insure correct opera tion of this relay have been made at the factory Up on receipt of the relay no customer adjustments other than those covered under SETTINGS should be required Acceptance Check The following check is recommended to...

Page 9: ...KUP EpoL POLARIZING VOLTAGE IPOL PQLARI Z lNG CURRENT Iop OPERATING CUR ENT ANGLE B t WHI CH lop LlGS EPOL f ANGLE B t WH CH l qp L AGS lpQL UNIT CLOSING TIMES A l CURRENT VOLTAGE OR DUAL POLARIZED Bl VOLT VOLTAGE POL AR I ZED DIRECTIONAL U N I T OPENING TIMES r _ CURRENT VOLTAGE OR DUALPOLI RIZEO I I I I 4 5 6 1 1910 20 30 40 so eo ao 100 200 3oo 400 6oo aoo tooo tOOO 3000 MULTIPLES OF PRODUCT PI...

Page 10: ...contact in po sition 3 The sensitivity adjustment is made by vary ing the tension of the spiral spring attached to the moving element assembly The spring is adj usted by placing a screwdriver or similar tool into one of the notches loc ated on the periphery of the spring ad juster and rotating it The spring adjuster is located on the underside of the bridge and is held in place by a spring type cl...

Page 11: ... cylind er unit _EJ _ P I ug Adjustment Apply current to terminals 8 and 9 with all other terminals open circuited Plug adjustment is then made per Table II such that the KRD 4 RELAY TEST CIRCUIT A _ ______ B __ I PHASE SHIFTER c A I _ 6 PHASE ANGLE A METER VARIAC W M spurious torques are reversed The plugs are held in po sition by upp er and lower plug clips These clips need not be disturbed in a...

Page 12: ...IOLES 14 011 CUTOUT PAIIEL CUTOUT DRILLIIIG FOR SEMI FLUSM NT PAIIEL DRI L L I NG OR CUTOUT FOil PRO Jf CTIOII MTG FROIIT VIEW DI A HOLES FOil 190 32 MTG SCIEWS 1 1e DIA 2 MOLES TEJioiiiiAL IIUMBER 57 D 7902 Fig 1 Outline and Drilling Plan for the Type KRD 4 Relay in the F T3 1 Case WESTINGHOUSE ELECTRIC CORPORATION RIILAY INSTRUMIINT DIVISION NIIWARK N J Printed In u s A w w w E l e c t r i c a l...

Page 13: ...ode of each diode is connected to the cathode of N EW I NF ORMATION the followin g diode to droduce a m aximum outf ut voltage of 1 4 volts or two diodes forward voltage drop Amplifier The amplifier consist of the two NPN transistors 1 Q l and 1 Q3 The second stage of the amplifier is an emitter follower which provides an output to the next stage The turn on timer consists of a potentiometer 1R14 ...

Page 14: ...DUAL POLARI ZED GROUND DIR ECTIONAL RELAY __________________ _ Fig 1 R elay s Front Picture Fig 2 Relay s Rear Picture 2 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 15: ...o the relay case by two hinges and a slotted strap from the bottom and can be closed by two screws which are located at the top of the door The slotted straps in the bottom allows the door to be opened up to 90 degrees and stops the door from sliding to the left and right The door can be removed by unscrewing the slotted st ap from the door The front panel consists of 2 parts 1 The circuit boards ...

Page 16: ...ppear across resistor 2R7 Overcurrent Unit Operation The overcurrent unit is also a st atic device and produc es a de volt age output when t he input current 4 exceeds t he set value The component s of t he overc urrent unit are con nect ed as shown in Fig 3 with no input to t he relay transistors 3Q 1 and 3Q 2 are in t he nonconducting condition and no output is obt ained f rom t he relay Zener d...

Page 17: ... ms Current Reversal Reset Time When a fault current reversal occurs the relay is reversed and the directional unit resets in 1 2 ms or l ess Both the directional unit and overcurrent unit must operate before a trip output can be obtained Hence the unit which takes the longer time to op er ate determines when an output will occur The over current unit cannot operate until the short circuit in its ...

Page 18: ... to zero This angle should be 150 3 degrees Circulate 5 amperes into Terminal Block ter 6 minal 4 and ou t 3 into terminal 1 a nd out 2 in phase The voltage outpu t should be obta ined Apply 10 amperes into 4 out 3 into 1 out 2 Apply 100 volts to terminals 7 and 8 cu rrent la gs voltage by 60 Voltage output should be obtained Reverse terminal connections 7 a nd 8 the output should read zero Tak e ...

Page 19: ... Terminal Block terminals 1 and 2 1 is polarity The rel ay should pick up at maxi mum sensitivity current lags 60 16 Disconnect the voltage termi nal 7 and 8 and circulate 0 5 amperes through Terminal Block terminals 1 and 2 and through 4 and 3 The relay should op erate at 20 volts de which is obtained between Jack Terminal 2JR and 2JB Also check a 20 volts de out put between printed circuit bo ar...

Page 20: ...ondition Set the relay for voltage pol arizing apply 100 volt to the voltage terminal and 10 amp eres to the op erating current transformer terminal block 1 and 2 with the proper polarity Set the phase shifter on 0 check the test point number 1 by an oscillo scop e and comp are them with the given waveforms If the ring modul ator output is obtained but there is no final output the trouble would be...

Page 21: ...NIT OUT PUT 6 II DUAL DIRECTI ONAL CIRCUIT 80 I 5317020001 I IOH OVERCURRENT C I R C U I J BO 5309033G02 Fig 3 Internal Schematic 2 I L 41 137 4 D I R EC T IONALLY SUPERVISED OYERCURRENT OUTPUT 4 5317034 9 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 22: ...IJill SINSITlVITY POUNTIAL POLAJIIZATION NO OUTl UT Iop OUTPUT roo lPOL RE I RIENCE NO OUT T PHASOR DIAIRAII FOR IIIAXIIIUIII SENSITIVITY CURRENT POLAJIIZ ATION OUTPUT Fig 4 External Schematic lO SIU o Pil OT AUXILIAJIY r oo Plc5 202 C493 I c c r 0 r tD N m c C tD 0 c z c 2 tD m n 1 0 z r g m r E l e c t r i c a l P a r t M a n u a l s c ...

Page 23: ...H I PQ ARIIEO MPP poL I OP COS 8 60 IIPOL IOPCOS IJ 0 l1 t r I MAXIMUM OPENATIN8 TIME 2 0 k 1 MI NIMUM Ol f RATIN8 TIME r t 3 4 s a T I I IO 20 30 40 10 0 10 100 zoo 100 400 100 100 1000 MULTIPLE OF PRODUCT PICKUP Fig 5 Operating Timing Curve For Directional Unit 1 t MAXIMUM O P E R AT I NG TIMES M INIMUM O PERATING TIMES K _ r 2 4 6 8 1 0 1 2 14 16 18 20 M U LT I PLE S OF PIC K UP VALUE 876A3 50 ...

Page 24: ... 1 4 6 8 1 0 1 2 I 4 I 6 I 8 2 0 2 2 24 2 6 2 8 M ULTI PLES O F PICKUP C URRENT Fig 7 Reset Timing Curve For Overcurrent Unit 4 Ia Ic 4 4 VOLTAGE POLARIZED TEST CIRCUIT I R I 4 Fig 8 Testing Circuit 551 876A348 30 32 34 38 876A353 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 25: ... 41 C 2 rnJ e ufr F e o IDJJ l JI BJQ ITIJ il ill em D ciD e GD LQI 14 i c n_ F ig 9 Printed Circuit Board 88 3 0 ill 1IIT IH lllin ill J l 6 C2 ml I y 1 R I 8 rr m I um 1 1 0 J I I ill I lJ lliT il QliJ illt I I 53 1 7D20 5317D22 5309D33 c c r 0 r o N m c C o 0 c z c 52 o m n 1 0 z r o m r r w E l e c t r i c a l P a r t M a n u a l s c ...

Page 26: ... _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 14 Fig 10 Waveforms Sweep 2 msl em Voltage 1 1 R ing Modulator O utput 1 2 Transistor Output 1 3 C 1 Output 1 4 Filter Output 2 volt em 10 volt em 10 volt em 2 volt em w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 27: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 28: ...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 RE LAY I N STR U M ENT D IVI S I O N N EWAR K N J Printed in U S A w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 29: ...REW 1 1 lf FOR TH I CK I ANEL USE I 32 STUD _ I I I 1 1 I I t t T I 1 J I J I 1 V I 1 2 r si 1 PANEL CUTOUT DRI LLI NG FOR SEMI FLUSH MTG r r i6 s e I _ PANEL DRI LLI NG OR CUTOijT FOR PROJECT I014 MTG FRONT V I EW _J 32 DI A 2 HOLES 16 mu4 1 UL NUMBER 57 D 7902 Fig 1 1 Outline and Drilling Plan for the KRP KR C an d KRD R e lays in the FT3 1 Cbse 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 ...

Page 30: ...OUND R ELAYS I L 4 1 1 37K B c ss S l i H k V F P C t J I t I I I t p I I I rl k t I _ I I I d c c O b Figure 10 Test Connections lCRC 1 9 I t I _ c c KR l 9 I 9 I b A b d c 1 5 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 31: ...s Torque In Contact Closing Direction Left Front View 80 Spurious Torque In Contact Opening D irection Right Front View Contacts remain open PHASE ANGLE RE LAT IONSH I P I lagging V by 60 7r I in phase with V I lagging V by 60 Yr I in phase with V I 0 leading IP by 40 7r In phase Ia leading 1v by 40 7r In pnase ADJUSTMENT Right Front View Plug Screwed Out Until Spurious Torque is Re versed Left Fr...

Page 32: ...0 Close the main relay contacts and check to see that the relay picks up and the target drops between 1 and 1 2 amperes d e To increase the pickup current remove the molded cover and bend the springs out or away from the cover To decrease the pickup current bend the springs in toward the cover R E N E W A L P A R T S Repair work can be done most satisfactorily at the factory However interchangeabl...

Page 33: ...g can be adjusted when the phase angle relationship between the operating circuit and the polarizing circuit is at the maximum torque angle or when the circuit relationship has the operating and polarizing circuits in phase 12 STATUM IUS SATURUIIICi nusronu 1 2 l SfC DEVICE IIUNIER CIIA RJ I OS Ul 671t DIRECTIOUL OHIICUIIIIUH OM0 110 IUL U DC TIIP IUS I 1 0 TYf E KRP 1 I I II V DlllECTI IJfiiAL UM...

Page 34: ...by a neon lamp in the contact circuit when energized with the required current The pick up of the overcurrent unit with the tap screw in any other tap should be within 5 of tap value If adjustment of pick up current in between tap settings is desired insert the tap screw in the next lowest tap setting and adjust the spring as described It should be noted that this adjustment results in a slightly ...

Page 35: ...s may be dic tated by experience to be suitabl e to the particular application All contacts should be periodically cleaned A contact burnisher S1tl82A836H01 is recommended for this purpose The use of abrasive m aterial for clean ing contacts is not recommended because of the danger of embedding small particles in the face of the soft silver and thus impairing the contact Cal i brat i o n Use the f...

Page 36: ...y have been made at the factory Upon receipt of the relay no customer adjustments other than those covered under MSETTINGS should be required Acceptance Check The following check is recommended to insure that the relay is in proper working order Overcurrent Unit I 1 Contact Gap The gap between the stationary and moving contacts with the relay in th e de ener gized position should be approximately ...

Page 37: ...44 16 9 9 09 3 1 0 2 78 1 2 14 70 30 0 2 58 16 25 00 30 0 2 40 10 10 5 30 0 2 60 15 22 0 29 5 2 40 20 37 8 29 0 2 35 10 40 24 55 2 29 0 2 30 30 84 0 28 5 2 25 40 149 0 28 0 2 24 Degrees current lags voltage TT Voltages taken with Rectox type voltmeter OVERCU RRENT UNIT BU RDEN DATA AT H I GH CURRENTS TYP E K R D REL AY AMPE R E R A N G E Tap Value Current Multiples of 20 Tap Value Current VA TT 65...

Page 38: ...6 37 9 5 90 37 4 3 0 1 92 38 4 5 34 38 1 4 0 3 06 39 6 4 77 39 1 2 1 68 39 8 10 50 38 8 3 2 58 37 3 7 03 3 6 5 2 8 4 3 75 36 1 5 87 35 8 5 5 19 35 8 5 1 7 35 7 6 7 07 35 8 4 88 36 1 8 1 1 30 35 7 4 5 1 36 8 4 2 17 42 2 3 3 7 42 0 6 3 20 38 0 2 22 37 8 4 1 6 8 4 64 35 5 1 80 36 0 9 5 37 35 8 1 67 35 7 1 2 8 52 34 8 1 46 35 0 16 13 8 33 7 1 33 35 0 10 6 08 34 0 1 52 33 9 15 12 2 32 6 1 34 34 1 20 20...

Page 39: ...8 2 2 0 0 96 28 7 6 09 27 8 1 4 2 5 1 25 28 7 5 04 28 1 3 0 1 63 29 6 4 57 28 9 4 0 2 55 30 1 3 99 30 0 2 1 55 38 3 9 54 37 6 3 2 26 35 5 6 25 34 8 4 3 20 33 2 4 98 33 1 2 8 5 4 39 32 8 4 40 32 7 6 5 78 32 4 4 05 32 1 8 9 31 31 8 3 62 32 4 4 2 05 42 8 3 24 42 0 6 2 94 38 5 2 03 38 0 8 4 09 35 7 1 59 35 7 4 16 9 4 77 34 8 1 46 35 5 12 7 30 33 3 1 24 34 3 16 11 5 32 0 1 1 1 34 2 10 5 23 30 9 1 33 30...

Page 40: ... e and should not b e c hanged The set screw in eac h stationary c ontact has been shop adju sted for optimu m follow and this ad ju stment shou ld not b e disturb ed S E T T I N G S Overcurrent Uni t I The only setting required is the pic kup current setting whic h is made by m eans of the c onnector sc rew loc ated on the tap plate By pla c ing the c on nector screw in the desired tap the relay ...

Page 41: ... 4 to 16 and the 10 to 40 ampere range relays the minimum pick up is 1 ampere for the cur rent polarized directional unit and 1 volt and 4 4 amperes for the voltage polarized directional unit T I M E C U R V E S The time curves for the KRD relay are shown in Fig 5 and 6 Fig 5 consists of three curves which are 1 Directional Unit opening times for current and volt age polarized 2 Directional Unit c...

Page 42: ...ore upon energization of the switch When the switch clos es 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 of the case by a push rod located at the bottom of the J r W I CA...

Page 43: ...ECTIONAL UNIT DIRECTIONAL UNit PHASE SHIFTER INDICATING CONTACTOR SWITCH 1 p ICS I K R P OVERCURRENT TRIP CONTACT HIGH SPEED OVERCURRENT UNIT DIRECTIONAL TORQUE CONTROL CONTACT DIRECTIONAL TRIP CONTACT D VOLTAGE POLARIZED DIRECTIONAL UNIT DIRECTIONAL TRIP CONTACT D DIRECTIONAL TORQUE CONTROL CONTACT D CURRENT POLARIZED DIRECTIONAL UNIT i l INDICATING CONTACTOR r SWITCH ICS K R D 2 0 m n t 0 z r 0 ...

Page 44: ...ue The electromagnet has two s eries connected polarizing coils mounted diametrically opposite one another two series connected operating coils mounted diamEtrically opposite one another two magnetic adjusting plugs upper and lower adjustin g plug clips and two locating pins The locating pins are used to accurately position the lower pin bearing which is threaded into the bridge The electromagnet ...

Page 45: ...EDES I L 41 1 37 30 Denotes change from superseded 1 ssue The cylinder unit consists of thre e basic assem blies an electromagnet assembly a moving element assembly and a stationary closing assembly The electromagnet assembly consists of an elec tromagnet an adjustable magnetic core two magnetic adj usting plugs lower bearing pin and a die casted aluminum frame The moving element assembly con sist...

Page 46: ... RELAY DECOU P L E R TRANSFORMER Fig 1 Type KRD 4 R elay Front Vi ew DECOUPLER CALIBRATION R ESISTOR OYERCURR ENT UNIT OVERCURRENT TAP BLOCK DIR ECTIONAL UN I T INDICATING _ CONTACTO R SWI TCH w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 47: ...__ __ __ __ __ __ ____ __ ______ ________ __ __ ____ ____ ___ _ L _ _ 41 _ 1 3 7 3E Fig 2 Type KRD 4 Relay Rear View POLARIZING REACTOR SATU RATING TRANSFO RMER VARISTO R SATURABLE SHUNT DECOUPLER CAPACI TOR 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 48: ...lay is connected to the pro tected transmission line as shown in Fig 4 In such a connection the relay operates to disconnect the line for ground faults of a definite magnitude that are flowing in a specified direction 4 The directional unit of the relay compares the phase angle between the fault current and the polari zing quantities of the system and either produces a contact closing torque for f...

Page 49: ...ples o p1ckup 3 6 0 5 Entering the curve in Fig 6 at multiples of pickup equal to 6 the closing time for the overcurrent is 1 4 m s However the total operating time for the overcurrent unit is 14 plus 4 ms which is the opening time of back contacts of the directional unit or 18 ms total operating time for the overcurrent unit The total operating time for the directional unit is 33 ms and since thi...

Page 50: ...rnal Schemati c of the Type KRD 4 Relay in the Type FT3 1 Case 6 TABL E I I DIR ECTIONAL UNIT CALI BRATION Relay Cur rent eres Both Plugs In Condition Rating Amp Adj ustment All Ranges 8 All Ranges 8 0 Spurious torque in con Right front view tact closing direction Plug Screwed out left front view until spurious tor que is reversed 1 0 Spurious torque in Left front view contact opening di PIug scre...

Page 51: ... the typ e KA 4 relay at the oppo site end of the line CAUTION Since the tap block connector screw car ries operating current be sure that the screw is turned tight In order to avoid opening the current transformer circuits when changing taps under load connect the spare tap screw in the desired tap position before removing the other tap screw from the original tap position ENERGY REQUIREMENTS BUR...

Page 52: ...nuts on the studs and then turning the proper nut with a wrench For detailed information refer to I L 4 1 076 A D J U S T M E N T S A N D M A I N T E N A N C E The proper adjustments to insure correct opera tion of this relay have been made at the factory Up on receipt of the relay no customer adjustments other than those covered under SETTINGS should be required Acceptance Check The following che...

Page 53: ...PERAT I N G CURRENT 8 ANGLE BY W H I CH 1 oP LlGS EpoL ANGLE BY WHI CH l Q_P l AGS lpQ K DIRE CTIONAL UNIT CLOSING TIMES A l CURR E N T VOLTAGE OR D U AL POLARIZED B l V OLT VOLTAGE P OL AR IZED 1 r r DIRECT I ONAL UNIT OPENING TIMES r CURRENT VOLTAGE OR DUAL POLARIZED I I I I l l I l l 4 5 6 7 8 9 10 20 30 40 50 80 10 100 200 300 00 600 100 1000 2000 3000 MULTIPLES OF PRODUCT PICKU P Fig 5 Typ i ...

Page 54: ...tivity adjustment is made by vary ing the tension of the spiral spring attached to the moving element assembly The spring is adjusted by placing a screwdriver or similar tool into one of the notches located on the periphery of the spring ad juster and rotating it The spring adjuster is located on the underside of the bridge and is held in place by a spring type clamp that does not have to be loose...

Page 55: ...nit 6 Pl ug Adjustment Apply current to terminals 8 and 9 with all other terminals open circuited Plug adjustment is then made per Table II such that the KRD 4 RELAY TEST CIRCU IT ___ ______ ___ I v v PHASE I i v SHIFTER A I 0 PHASE ANGLE r METER VARIAC u j spurious torques are reversed The plugs are held in position by upper and lower plug clips These clips need not be disturbed in any manner whe...

Page 56: ...I 1t loo P EL CUTOUT DRI LL I NG FOR SEMI FlUstl MT 2 16 1 PANEL DRI LL I NG 0 CUTOUT FOR PIIOJf CTI011 MTG FROIIT V I EW DI A HOLES FOR 190 32 MTB SCREWS 1 I I DIA 2 NOLES TEIINIIIAL IIUMBEl 57 D 7902 Fig 1 Outline and Drilling Plan for the Type KRD 4 Relay in the FT3 1 Case WESTINGHOUSE ELECTRIC CORPORATION RKLAY INSTRUMKNT DIVISION NKWARK N J Printed In U S A w w w E l e c t r i c a l P a r t M...

Page 57: ...Denotes change from superseded 1 ssue The slectromagnet has two series connected polarizing coils mounted diametrically opposite one another two series connected operating coils mounted diametrically opposite one another two magnetic ad justing plugs upper and lower adjusting plug clips and two locating pins The locating pins are used to accurately position the lower pin bearing which is mounted o...

Page 58: ... _ RI DGE RECTIFIER CS 1 UNIT ICS UNIT Fig 1 Typ e KRV Relay Without Case Front Vi ew UNIT RESISTOR Fig 2 Type KRV Relay Without Case Rear View 1 tl m a a m r E l e c t r i c a l P a r t M a n u a l s c ...

Page 59: ... to insure coordination be tween the directional contact D and the I contact to prevent tripping on reversed faults where the directional contact was closed on load I nd i ca t i n g Con t a c to r S w i tc h I C S The d e indicating contactor switch is a small clapper type device A magnetic armature to which leaf spring mounted contacts are attached is at tracted to the magnetic core upon energiz...

Page 60: ... e KRV relay is intended for phase fault pro tection and the directional unit has its maximum torque wh en the current leads the voltage by approx imately 30 The directional unit minimum pickup at its maximum torque angle is shown in Table 1 4 TABLE 1 RELAY RANGE DIR UNIT PICKUP 0 5 to 2 Amps 1 2 Volts and 2 Amps 1 4 1 2 Volts and 2 Amps 2 8 1 2 Volts and 2 Amps 4 16 1 2 Volts and 4 Amps 10 40 1 2...

Page 61: ... 35 5 6 25 2 8 4 3 20 33 2 4 98 5 4 39 32 8 4 40 6 5 78 32 4 4 05 8 9 31 3 1 8 3 62 4 2 05 42 8 3 24 6 2 94 38 5 2 03 8 4 09 35 7 1 59 4 1 6 9 4 77 34 8 1 46 12 7 30 33 3 1 24 1 6 1 1 5 32 0 1 1 1 10 2 5 29 63 1 5 4 2 25 47 20 6 3 22 40 10 40 24 8 2 21 35 30 1 1 1 9 31 40 18 1 9 28 20 10 32 60 30 17 28 45 40 25 24 38 20 80 48 32 23 34 60 45 2 2 30 80 70 21 27 c J Degrees current lags voltage tt Vo...

Page 62: ...l tap pos ition D i re c t i o n al U n i t D No setting is required I n d i ca t i n g Cont o c ta r S w i t c h U n i t I C S No setting i s required A u x i l i a ry S w i tc h C S 1 N o setting required o n the CS 1 unit except for the selection of the required 24 48 1 25 or 250 volt age on the tapped resistor This connection can be made by referring to Fig 6 6 I N S T A L L A T I O N The rela...

Page 63: ...unit can be check ed by inserting the tap screw in the desired tap hole and applying rated tap value current The contact should close within 5 of tap value current Directional Unit D 1 Contact Gap The gap between the station ary contact and moving contact with the relay in the de energized position should be approximately 020 2 Sensitivity The directional unit should pick up at its maximum torque ...

Page 64: ...gap of ap proximately 020 The clamp holding the stationary contact housing need not be loosened for the adjust ment since the clamp utilizes a spring type action in holding the stationary contact in position 3 The sensitivity adjustment is made by vary ing the tension of the spiral spring attached to the moving element assembly The spring is adjusted by placing a screwdriver of similar tool into o...

Page 65: ...piral sp ring attached to the mov ing element assembly The spring is adjusted by plac ing a screwdriver or similar tool into one of the notches located on the periphery of the spring adjust er and rotating it The spring adjuster is located on the underside of the bridge and is held in place by a spring type clamp that does not have to be loosened prior to making the necessary adjustments The sprin...

Page 66: ...de of the Micarta disc Connect lead A to proper terminal per Fig 6 Block directional unit D and I contacts close and e nergize trip circuit with rated voltage Contacts of 1 0 auxiliary switch CS 1 should make as indicated by a neon lamp in the contact circuit I n d i cati n g Conta cto r S w i t th I C S Adjust the contact gap for approximate ly 5 64 1 64 0 Close the main relay contacts and check ...

Page 67: ...sed Then screw in for slight opening 10 40 150 6 torque 20 80 Plugs should be fully in prior to core adjustment t Slight re adjustment may be necessary of core or plugs if contact closes at these check points 6 150 Amps may be obtained by using a 1 0 5 CT as shown below connect CH ECK POINTS 80 50 and 20 Amps 120 7 5 and 30 Amp s 0J r PRI ____J T D Dir Unit operating c i rcuit on ly 1 20 OR 220 VA...

Page 68: ...A i OR CU 0 JT TE RM I NAL AN D MOUNT I N3 DE AI L O k DIA 4 1 0L n R 190 32 MIG u WS PANEL C UTDUT t DRILL IWQ FOR SEt 11 l LU H Ml PA Nt _ DI I LL G OR C JTOI J FOR PRO H CT I CN MTGr FP ONT VIEW 3 SR 57 D 7902 Fig 8 Outline and Drilling Plan for the Type KRV Relay in the Type FT3 1 Case W E S T I N G H O U S E E L E C T R I C R E LAY I N STR U M E NT D IVI S I O N C O R P O R A T I O N N EWAR K...

Page 69: ... 2A Denotes change from superseded i ssueo The slectromagnet has two series connected polarizing coils mounted diametrically opposite one another two series connected operating coils mounted diametrically opposite one another two magnetic ad justing plugs upper and lower adjusting plug clips and two locating pins The locating pins are used to accurately position the lower pin bearing which is moun...

Page 70: ...CTIFIER 1 UNIT TAP BLOCK D UNIT CS 1 UNIT ICS UNIT Fig 1 Type K R V Re lay Without Case Front View UNIT RESISTOR Fig 2 Type KRV Relay Without Case Rear View t m a a m r E l e c t r i c a l P a r t M a n u a l s c ...

Page 71: ...on is to insure coordination be tween the directional contact D and the I contact to prevent tripping on reversed faults where the directional contact was closed on load I n d i ca t i n g Conta c to r S w i tc h I CS The d e indicating contactor switch is a small clapper type device A magnetic armature to which leaf spring mounted contacts are attached is at tracted to the magnetic core upon ener...

Page 72: ...The KRV relay is intended for phase fault pro tection and the directional unit has its maximum torque when the current leads the voltage by approx imately 30 The directional unit minimum pickup at its maximum torque angle is shown in Table 1 4 TABLE 1 RELAY RANGE DIR UNIT PICKUP 0 5 to 2 Amps 1 2 Volts and 2 Amps 1 4 1 2 Volts and 2 Amps 2 8 1 2 Volts and 2 Amp s 4 16 1 2 Volts and 4 Amps 10 40 1 ...

Page 73: ...3 0 1 63 29 6 4 57 28 9 4 0 2 55 30 1 3 99 30 0 2 1 55 38 3 9 54 37 6 3 2 26 35 5 6 25 34 8 2 8 4 3 20 33 2 4 98 33 1 5 4 39 3 2 8 4 40 32 7 6 5 78 32 4 4 05 32 1 8 9 3 1 3 1 8 3 62 32 4 4 2 05 42 8 3 24 42 0 6 2 94 38 5 2 03 38 0 4 16 8 4 09 35 7 1 59 35 7 9 4 77 34 8 1 46 35 5 12 7 30 33 3 1 24 34 3 16 1 1 5 32 0 1 1 1 34 2 10 2 5 29 63 29 15 4 2 25 47 25 10 40 20 6 3 22 40 22 24 8 2 21 35 21 30...

Page 74: ... pos ition D i rec t i o n a l U n i t D No setting is required I n d i ca ti n g Contocto r S w i t c h U n i t I CS No setting is required A u x i l i a ry S wi tch C S 1 N o setting required o n the CS 1 unit except for the selection of the required 24 48 1 25 or 250 volt age on the tapped resistor This connection can be made by referring to Fig 6 6 I N S T A L L A T I O N The relays should be ...

Page 75: ...esired tap hole and applying rated tap value current The contact should close within 5 of tap value current Directional Unit D 1 Cont act Gap The gap between the station ary contact and moving contact with the relay in the de energized po sition should be approximately 020 2 Sen sitivity The directional unit should pick up at its m aximum torque angle current leading the voltage by 30 when energiz...

Page 76: ...ecommended for this purpose The use o f abrasive material for clean ing contacts is not recommended because of the danger of embedding small particles in the face of the soft silver and thu s impairing the contact C al i b ra t i o n 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 b...

Page 77: ...uster is located on the underside of the bridge and is held in place by a spring type clamp that does not have to be loosened prior to making the necessary adjustments The spring is to be adjusted such that the con tact will close when the unit is energized at its maximum torque angl e current l eading the voltage by 30 with the value of current and voltage shown in Table 1 4 The magnetic plugs an...

Page 78: ...just the contact clearance for 3 64 by m eans of the two small nuts on either side of the Micarta disc Connect lead A to proper terminal per Fig 6 Block directional unit D and I contacts clos e and energize trip circuit with rated voltage Contacts of 10 auxiliary switch CS 1 should make as indicated by a neon lamp in the contact circuit l nd i eati n g Ca n ta cto r S w i t th I C S Adjust the con...

Page 79: ...tact closing direction 2 8 Amp left front view screw out right magnetic plug until direction of spurious torque Magnetic is reversed Plugs If spurious torque is in the contact opening direction screw out left plug until spurious 4 16 Amp 100 Amp torque is slight contact opening 80 50 20 Amps 1 0 40 Amp 1 50 Amp 1 20 75 30 Amps 20 80 Amp t Short circuit the voltage polarizing circuit at the relay t...

Page 80: ..._ t jJF T RM INAL AN D MOUNT I N J DEIAI L i rAA 1 0 H i E S OR C U 0 JT PANEL C UTCUT DRILL WGr FOR SEMI FLUC H MTQ PANE _ D I LLI G OR C JTO J FOR PROJF CT I ON MTGr F ONT JIE N 57 D 7902 Fig 8 Outl ine and Drilling Plan for the Type KRV Relay in the Type FT3 1 Case W E S T I N G H O U S E E L E C T R I C R E LAY I N STR U M E N T D IVI S I O N C O R P O R A T I O N N EWAR K N J Printed in U S A...

Page 81: ...e e lectromagnet has two s eries connected polarizing coils mounted diametrically opposite one another two series connected operating coils mounted diametrically opposite one another two magnetic adjusting plugs upper and lower adjustin g plug clips and two locating pins The locating pins are used to accurately position the lower pin bearing which is threaded into the bridge The electromagnet is s...

Page 82: ...NETIC o o ADJUSTING PLUGS DIRECTIONAL UNIT DIRECTIONAL UNit PHASE SHIFTER INDICATING __ CONTACTOR SWITCH ICS K R P OVERCURRENT TRIP CONTACT HIGH SPEED OVERCURRENT UNIT r SPARE TAP SCREW l DIRECTIONAL TORQUE CONTROL CONTACT D DIRECTIONAL TRIP CONTACT D DIRECTIONAL TORQUE CONTROL CONTACT D CURRENT POLARIZED DIRECTIONAL UNIT i II DICATING CONTACTOR l t SWITCH ICS K R D 2 m n t 0 z r 0 m n c m z t 0 c...

Page 83: ...n 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 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 IIID ICATII I_ COtiTACTOR SWITC...

Page 84: ...ange relays the minimum pick up is 1 ampere for the cur rent polarized directional unit and 1 volt and 4 4 amperes for the voltage polarized directional unit T I M E C U R V E S The time curves for the KRD relay are shown in Fig 5 and 6 Fig 5 consists of three curves which are 1 Directional Unit opening times for current and volt age polarized 2 Directional Unit closing time for current and volt a...

Page 85: ...ct bounce performance and should not be changed The set screw in each stationary contact has been shop adjusted for optimum follow and this ad justment should not be disturbed S E T T I N G S Overcurrent U n i t I The only setting required i s the pickup current setting which is made by m eans of the connector screw located on the tap plate By placing the con nector screw in the desired tap the re...

Page 86: ... 28 2 1 4 2 0 0 96 28 7 6 09 2 7 8 2 5 1 25 28 7 5 04 28 1 3 0 1 63 29 6 4 57 28 9 4 0 2 55 30 1 3 99 30 0 2 1 55 38 3 9 54 37 ff 3 2 26 35 5 6 25 34 8 4 3 20 33 2 4 98 33 1 2 8 5 4 39 32 8 4 40 3 2 7 6 5 78 32 4 4 05 3 2 1 8 9 31 31 8 3 62 32 4 4 2 05 42 8 3 24 42 0 6 2 94 38 5 2 03 38 0 8 4 09 35 7 1 59 35 7 4 16 9 4 77 34 8 1 46 35 5 12 7 30 33 3 1 24 34 3 16 1 1 5 32 0 1 1 1 34 2 10 5 23 30 9 ...

Page 87: ...10 37 1 6 84 36 8 2 5 1 46 37 9 5 90 37 4 3 0 1 92 38 4 5 34 38 1 4 0 3 06 39 6 4 7 Z 39 1 2 1 68 39 8 10 50 38 8 3 2 58 37 3 7 03 36 5 2 8 4 3 75 36 1 5 87 35 8 5 5 19 35 8 5 17 35 7 6 7 07 35 8 4 88 36 1 8 11 30 35 7 4 51 36 8 4 2 17 42 2 3 37 42 0 6 3 20 38 0 2 22 37 8 4 16 8 4 64 35 5 1 80 36 0 9 5 37 35 8 1 67 35 7 12 8 52 34 8 1 46 35 0 16 13 8 33 7 1 33 35 0 10 6 08 34 0 1 52 33 9 15 12 2 3...

Page 88: ...75 42 0 6 10 7 1 42 0 7 45 42 0 8 18 40 42 0 7 15 4 2 86 40 0 4 45 40 0 6 4 8 3 34 0 3 34 34 0 8 7 58 32 0 2 90 31 0 44 16 9 9 09 3 1 0 2 78 3 1 0 12 14 70 30 0 2 58 30 0 16 25 00 30 0 2 40 30 0 10 10 5 30 0 2 60 30 0 15 22 0 29 5 2 40 29 5 20 37 8 29 0 2 35 29 5 10 40 24 55 2 29 0 2 30 29 5 30 84 0 28 5 2 25 29 5 40 149 0 28 0 2 24 29 5 Degrees current lags voltage 7T Voltages taken with Rectox t...

Page 89: ...pera tion 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 A cceptance Check The following check is recommended to insure that the relay is in proper working order Overcurrent Unit I 1 Contact Gap The gap between the stationary and moving contacts with the relay in the de ener gized position sho...

Page 90: ...d be periodically cleaned A contact burnisher S1tl82A836H01 is recommended for this purpose The use of abrasive material for clean ing contacts is not recommended because of the danger of embedding small particles in the face of the soft silver and thus impairing the contact C al i brat ion Use the following procedure for calibrating the relay if the relay has been taken apart for repairs or the a...

Page 91: ...ated Qy a neon lamp in the contact circuit when energized with the required current The pick up of the overcurrent unit with the tap screw in any other tap should be within 5 of tap value If adjustment of pick up current in between tap settings is desired insert the tap screw in the next lowest tap setting and adjust the spring as described It should be noted that this adjustment results in a slig...

Page 92: ... 1 This table in dicates that the spring can be adjusted when the phase angle relationship between the operating circuit and the polarizing circuit is at the maximum torque angle or when the circuit relationship has the operating and polarizing _circuits in phase 12 I i DEVICE MIIMI I CtWU 671 OIR ECTIOIAL O i ERCUlllElll liROIIIO REU Y TYPE KRP OVEICUII EMT UMIT GF TYP E UP p DIRECTIOIAL li l T O...

Page 93: ... 64 1 64 0 Close the main relay contacts and check to see that the relay picks up and the target drops between 1 and 1 2 amperes d e To increase the pickup current remove the molded cover and bend the springs out or away from the cover To decrease the pickup current bend the springs in toward the cover R E N E W A L P A R T S Repair work can be done most satisfactorily at the factory However inter...

Page 94: ...e In Contact Closing Direction Left Front View All Ranges 80 Spurious Torque In Contact Opening Direction Right Front View Contacts remain open PHASE ANGLE RELAT IONSH I P I lagging V by 60 TT I in phase with V I lagging V by 60 TT I in phase with V 1a leading by 40 TT In phase 1a leading 1u by 40 TT In pnase ADJUSTMENT Right Front View Plug Screwed Out Until Spurious Torque is Re versed Left Fron...

Page 95: ...Z SCREW FOR T H I CK w L US E 190 3 51UD OIA T RMII IAL AW D MOUHT I NCI DEIAI LC DIA 4 0LE S FOR 1 90 32 MT OCR EWS PANEL CUTOUT t DRILLIWGo FOR SEt 1 f L J C H MTQ PANEL DRILLING OR CUTOUT PROJ C T ON MTC r FRm lT 1 EW TERMINAL N UMeER 57 D 7902 Fig JO Outline anJ Drilling Plan for the KRP KRC anJ KRD Relays in the FTJ J Case 15 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 96: ...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 NT D IVI S I O N N EWAR K N J Printed in U S A w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 97: ...SEDES I L 4 1 1 37 3 Denotes change from superseded i ssue The cylinder unit consists of three basic assem blies an electromagnet assembly a moving element assembly and a stationary closing assembly The electromagnet assembly consists of an elec tromagnet an adjustable magnetic core two magnetic adjusting plugs lower bearing pin and a die casted aluminum frame The moving element assembly con sists...

Page 98: ... line as shown in Fig 4 In such a connection the relay operates to disconnect the line for ground faults of a definite magnitude that are flowing in a specified direction 4 The directional unit of the relay compares the phase angle between the fault current and the polari zing quantities of the system and either produces a contact closing torque for faults in the trip direction or produces a conta...

Page 99: ...f pickup P 3 6 0 5 Entering the curve in Fig 6 at multiples of pickup equal to 6 the closing time for the overcurrent is 14 ms However the total operating time for the overcurrent unit is 14 plus 4 ms which is the opening time of back contacts of the directional unit or 18 ms total operating time for the overcurrent unit The total operating time for the directional unit is 33 ms and since this is ...

Page 100: ...Rating Amperes Condition Crnccoc tOip loch PIog m Adjustment All Range r JO Sp ious rque in con Right front view 4 do iog dicwioo left front view All Ranges ISo Spuri que in Plug Screwed out until spurious tor que i s reversed Left front view 0 E a z t _ x _____ contact opening di PIug screwed out rection Right front until spurious tor view Contact que is in contact remain Open closing directions ...

Page 101: ...the line CAUTION Since the tap block connector screw car ries operating current be sure that the screw is turned tight In order to avoid opening the current transformer circuits when changing taps under load connect the spare tap screw in the desired tap position before removing the other tap screw from the original tap position ENERGY REQUIREMENTS BURDEN DATA OF OPERATING CURRENT CIRCUIT 60 CYCLE...

Page 102: ...nd then turning the proper nut with a wrench For detailed information refer to I L 4 1 076 A D J U S T M E N T S A N D M A I N T E N A N C E The proper adjustments to insure correct opera tion of this relay have been made at the factory Up on receipt of the relay no customer adjustments other than those covered under SETTINGS should be required Acceptance Check The following check is recommended t...

Page 103: ...POL POLAR I Z I NG CURRENT Iop OPERAT I N G CURIUNI 9 ANGLE BV W H I C H lop LA dS EpQL I ANGLE BY WHI CH l _OP L AGS Ipo r UNIT CLOSiNG TIMES A CURRENT 1 VOLTAG E OR DUAL POLARIZED K Bl VOLT V O LTAGE P O L AR I ZED r r 1 DIRECTIONAL UNIT OPENING TIMES ARENT VOLTAGE OR DUAL POLA RIZ ED I I I I I 4 5 6 1 1 9 10 20 30 40 so 10 10 100 200 300 400 100 100 1000 2000 sooo MULTIPLES OF PRODUCT PICKUP Fi...

Page 104: ...ationary 1 0 contact in position 3 The sensitivity adjustment is made by vary ing the tension of the spiral spring attached to the moving element assembly The spring is adj usted by placing a screwdriver or similar tool into one of the notches located on the periphery of the spring ad juster and rotating it The spring adjuster is located on the underside of the bridge and is held in place by a spr...

Page 105: ... in the slots in the bottom of the cylinder unit 6 P l ug Adj ustment Apply current to terminals 8 and 9 with all other terminals open circuited Plug adjustment is then made per Table II such that the spurious torques are reversed The plugs are held in position by upper and lower plug clips These clips need not be disturbed in any manner when making the necessary adj ustment I ndi cating Contact S...

Page 106: ...I LLIRG FOR SO ti FLUSII MT PAIIEL DRI LLING OR CUTOUT FOR PRO If CTIOR NTG FROIIT V I EW D I A HOLES FOR 190 32 MT SCIDS 1 II DIA 2 NOlES TE1141Ul IIUM8ER 57 D 7902 Fig 7 Outline and Drilling Plan for th e Type KRD 4 Relay in the FT3 1 Case WESTINGHOUSE ELECTRIC CORPORAT I ON RI LAY INSTRUMI NT DIVISION N I WAR K N J Printed In U S A w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 107: ...s S e ns i t j i t y with 2 v olt s l i n a t o l i n e for any t a p i s d e f i n e d by t h e fo l lowin equa t i o n I S S Amner e s 1 D _ C h _ VD I l 3 r I T l S 2 l C e j _ ct c t e l S v l C l c lf 1 e e tJ l G _ 1 6 S2fll as pe L L o i 1r 1 1 l T 8 I o r ra c ic rioi __ _ t _e u 1 C vE ric s fro 1 10 2 0 c c e ct o __ t _ 0 1lue for a T s et t i ng of 8 7 a nd 7 5 d ezre e s t o 1 1 5 per...

Page 108: ... w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 109: ... lld b 2 7 5 2 92 2 ITipS Rout ine Ma int ena n c e a s per I L 41 491 4A l i Jtot r2 r sfo r o C h s c a s p I L 41 49l l D exc e Jt t h e voJ t c g e drc o ro r 1A ir c r 1 rc___ ta s c o t sr i Jc l s s hould read 66 6 6s 6 71 0 6 le 6 volt s 1 volt I h i s volt a g e i s c or 1pu v e d 3 fol J c s lOO c 2j3 1 t h e sum of valu bet re en R le J d a nd t h e t p b e i r g l i lsured Ex a raple 1...

Page 110: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 111: ...per I L 4l 491 4A exc ept us e following pickup 1imitsi 0r r p ss un it v1TC 2 c L and v 2F3F 10 volt s I lin 30 volt s I 1ilax 1 2 2 a 1 5 8 f o r KD lr for KD J_ l 3 42 a KD 4 3 50 a KI 41 ___________ __ _ _ v___ __________ __ __ ____ _ _ _ _ __ ____ _ _ _ fi ____ c I 70 volt s 7 1 5 7 7 a both relays Limit s for P 3 s 6 t o Pha s s unit t i c F Q Lfo t z i E L __ 5 6 7 5 0 48 52 30 2 80 3 00 70...

Page 112: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 113: ... 6 __ L LII II_ 06 I I I 0 06 0 0 2__l I j I I i l I I I l I 1 i 1 l I I i l I 1 2 7 c c 2 1 1 2 o c t J 2 I 5 o J r f 1 1 1 nn 16 9 I 2 5 1 I t 1 0 1 1 1 f _ __ __ _ L U c t i__ 2_ t_ u _ _ 2U 0 v j l _ 1 _1_ __ __ _ 1 i i i I j i I I i i 1 I H I l I I i 1 r r r I t I r l r l l j l l 1 I I J L e Lu _2_ 0 _ 3 6 tO JLJ_J 12 1 7 1 1_ 1_ __l 26 1 _Q_ 0 0 J 0____1 i I 1 j l I l l l 1 I c l 1 j J I r I...

Page 114: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

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Westinghouse KRD-4, Installation, Operation, & Maintenance Instruction

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