GE JBCG51M, Instructions Manual

Page 1: ...IRECTIONAL OVERCURRENT RELAYS TYPES JBCG51M JBCG52M JBCG51M Y1A JBCG53M JBCG54M JBCG53M Y1A JBCG77M JBCG78M GE Protection and Control 205 Great Valley Parkway Malvern PA 19355 1337 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 2: ...IAL POLARIZATION 20 INSTANTANEOUS OVERCURR ENT UNIT DIRECTIONALLY CONTROLLED 21 GEK 49849 CONTENTS PICKUP SETTING 21 INSTANTANEOUS UNIT NON DIRECTIONALLY CONTROLLED 21 INSTALLATION 21 LOCATION 21 MOUNTING 21 CONNECTIONS 22 INSPECTION 22 CAUTION 22 OPERATION 22 TARGET AND SEAL IN UNIT 22 TIME OVERCURRENT UNIT 22 DIRECTIONAL UNIT 22 INSTANTANEOUS OVERCURRENT UNIT DIRECTIONALLY CONTROLLED 23 INSTANTA...

Page 3: ...ely i s connected i n seri es wi th the contacts of the t i me overcurrent uni t and the i nstantaneous overcurrent uni t The contacts of each seal i n uni t respect i vely are connected i n parallel wi th the contacts of the t i me overcurrent uni t and the i nstantaneous overcurrent uni t to provi de protecti on for them and the associated control spri ng All the JBCG relays are mounted in stand...

Page 4: ...i l l ustrates the effect of usi ng dual pol ari zat i on as compared to pol ar i zati on from a source of vol tage or current a l one The di fferences between the var i ous mode l s covered by thi s i nstruct i on book are shown i n Tabl e 1 Inverse time rel ays shoul d be used on systems where the fau l t current f l owi ng through a gi ven rel ay i s i nf l uenced l argely by the system generat...

Page 5: ...s Al l owance must be made for the time i nvol ved i n openi ng each breaker after the rel ay contacts c l ose The i nstantaneous cup uni t i s torque control l ed by the di rect i onal uni t When it is used for d irect tri ppi ng i t wi l l only be necessary when determi n i ng a setti ng to consi der the maximum current that the i nstantaneous uni t wi l l see for a fau l t at the remote termi n...

Page 6: ... the operat i ng coi l rat i ngs of al l three units shoul d be cons i dered i n determi n i ng the rat i ng of the ent i re operati ng ci rcu i t TIME OVERCURRENT UNIT The one second rati ngs of the TOC u n i ts are gi ven i n Tab1e 2 The canti nuous rat i ngs for the vari ous taps of each model and current range are gi ven i n Tables 3 4 and 5 TABLE 2 ONE SECOND RATING OF TOC UNITS RELAY RANGE O...

Page 7: ...g 8 0 9 0 10 0 12 0 14 0 15 0 16 0 17 5 20 0 20 0 20 0 JBCG52 Amps INSTANTANEOUS OVERCURRENT UNIT DIRECTIONALLY CONTROLLED Ranges and rati ngs of the IOC uni ts rel ay termin a l s 2 and 3 are shown i n Tabl e 6 The operat i ng coi l s have dual rati ngs obtai ned by ser i es or paral lel connections TABLE 6 CONTINUOUS AND ONE SECOND RATINGS OF DIRECTIONALLY CONTROLLED IOC UNIT TOTAL PICKUP CONTIN...

Page 8: ...east one ampere overl ap between the maximum L setti ng and the minimum H sett i ng Whenever poss i bl e always sel ect the h i gher range si nce i t has the hi gher cont i nuous rat i n g TARGET AND SEAL IN UNITS The rat i ng and impedance of the seal i n uni t for the 0 2 0 6 and two ampere taps are gi ven i n Tabl e 8 The tap sett i ng used wi l l depend on the current drawn by the tri p coi 1 ...

Page 9: ...nt and potenti al pol ari zat i on i s typi f i ed i n F i g 10 The current requ i red to c l ose the time overcurrent unit contacts wi l l be withi n f i ve percent of the tap screw sett i n g The pi ckup of the di recti onal ly control l ed i nstantaneous overcurrent uni t can be adjusted over an ei ght to one range as i ndi cated i n Tabl e 6 RESET TIME OVERCURRENT UNIT Inverse time overcurrent...

Page 10: ... uni t Table 10 g i ves the total burden of the time overcurrent uni t plus the i nstantaneous overcurrent uni t Table 11 g i ves the burden of the non di rect i onally controlled i nstantaneous overcurrent uni t Ordi narily the potenti al c i rcui t i s i n the open corner of broken delta potent i al transformers and the current ci rcu i ts are i n the res i dual circuits of current transformers ...

Page 11: ... 660 0 39 Paral l el 20 80 0 38 1 16 1 22 4 88 0 311 0 545 0 276 BURDENS OF OVERCURRENT UNI TS TIME AND I NSTANTANEOUS AT 60 CYCLES BURDEN OHMS Z THREE TEN RANGE BURDENS AT MI NIMUM P I CKUP TIMES TIMES TOC I OC roc UNI T MINIMUM TAP OF TOC UNIT MIN MIN UNI T UNI T CONNECTIONS R J x Z VA PF P U P U 2 16 Seri es 2 8 5 84 21 57 22 3 5 6 0 26 11 38 6 90 P aral l el 4 16 5 65 21 10 21 8 5 5 0 26 10 88...

Page 12: ...8 0 33 0 72 0 79 1 8 0 42 0 79 0 70 Paral l el 4 16 0 13 0 25 0 28 0 6 0 46 0 28 0 28 1 5 12 10 80 Seri es 10 40 0 16 0 29 0 33 0 7 0 49 0 33 0 33 Paral lel 20 80 0 10 0 16 0 19 0 4 0 53 0 19 0 19 The impedance values gi ven are those for the minimum tap of each rel ay The impedance for other taps at pi ckup current tap rati ng vari es i nversely approximately as the square of the current rat i ng...

Page 13: ...central core The cupl i ke alumi num i nducti on rotor i s free to operate i n the annul ar air gap between the pol es and the core The pol es are fi tted al ternatel y wi th current operat i ng coi l s and potenti al pol ar i z i ng coi l s The princi ple by whi ch torque i s devel oped i s the same as that of an i nduct i on d i sk rel ay wi th a wattmetri c e l ement a l though i n arrangement ...

Page 14: ...ntacts the shad i ng coi l s act to produce a spl i t phase fi el d whi ch i n turn devel ops torque on the operat i ng di sk The extremely i nverse time overcurrent uni t i s of the wattmetri c type s imi l ar to that used i n watthour meters except as fo11 ows the upper porti on of the i ron structure has two concentr i c wi ndi ngs on the m i dd l e l eg of the magnet i c ci rcui t One of these...

Page 15: ... ne wire and an outer wi ndi ng havi ng a few turns of heavy wire The outer wi ndi ngs of the corner coi l s are connected e ither i n seri es or i n paral l el wi th the s i de coi l s by tap l i nks provi ded on the rel ay these ser i es or paral l e l comb i nat i ons are connected i n seri es wi th the operati ng coi l of the TOC uni t The i n ner wi ndi ngs of the corner coi l s are al l conn...

Page 16: ...s have not been di sturbed If the exami nat i on or the test i nd i cates that readjustment i s necessary refer to the sect i on on SERVICING These tests may be performed as part of the i nstallati on or acceptance tests at the di scret i on of the user S i nce most operati ng compani es use di fferent procedures for acceptance and i nstallat i on tests the followi ng sect i on i ncludes all appli...

Page 17: ...ases or an equ i val ent steel case In thi s way any magneti c effects of the enc l osure wi l l be accurately dupl i cated duri ng testi ng A rel ay may be tested wi thout removi ng i t from the panel by us i ng two 12XLA13A test p l ugs Thi s pl ug makes connect i ons only with the rel ay and does not di sturb any shorti ng bars i n the case The 12XLA12A test p l ug may al so be used Al though t...

Page 18: ...ft i n both taps at the same time P i ckup and Dropout Test 1 Connect rel ay studs 1 and 1 1 or 1 and 1 2 see i nternal connect i ons di agram to a DC source ammeter and l oad box so that the current can be control l ed over a range of 0 1 to 2 0 amperes 2 C l ose or jumper the contact s that paral lel the seal i n uni t contact 3 Increase the current sl owly unti l the seal i n uni t p i cks up S...

Page 19: ...he JBCG51 and JBCG53 rel ays A different procedure appl ies to the JBCG77 rel ays For the JBCG77 rel ays the pi ckup of the uni t for any current tap sett i ng i s adjusted by means of the var i abl e res i stor i n the phase shifti ng c i rcu i t Thi s adjustment al so permits any desi red setti ng i ntermedi ately between the vari ous tap setti ngs to be obtai ned The control spr i ng i s prewou...

Page 20: ...he relay at No 5 time dial setting and the 2 0 amp tap Using the test connections in Fig 21 apply five times tap current 10 0 amp to the relay The relay should operate within the limits given in Table 13 TABLE 13 TOC UNIT OPERATING TIME LIMITS RELAY TYPE JBCG51 JBCG53 JBCG77 DIRECTIONAL UNIT Current Polarization a Connect per Fig 22 TIME IN SECONDS MIN MIDPOINT 1 66 1 78 1 22 1 31 0 86 0 92 MAX 1 ...

Page 21: ...See the internal connections diagram and Tabl e 7 Whenever possibl e use the higher range since the higher range has a higher continuous rating The instantaneous unit has an adjustabl e core l ocated at the top of the unit To set the instantaneous unit to a desired pickup l oosen the l ocknut and adjust the core Turning the core cl ockwise decreases the pickup turning the core counterclockwise inc...

Page 22: ...ill be set at zero before the relay leaves the factory If the setting has not been changed it will be necessary to change this setting in order to open the time overcurrent unit contacts The following tests are suggested TARGET AND SEAL IN UNIT 1 Make sure that the tap screw is in the desired tap 2 Perform pickup and dropout tests as outlined in the ACCEPTANCE TESTS section TIME OVERCURRENT UNIT 1...

Page 23: ...el ect the test i nterval best sui ted to hi s i nd i vi dual requi rements i t i s suggested that the poi nts l i sted bel ow be checked at an i nterval of from one to two years These tests are i ntended to ensure that the rel ays have not devi ated from thei r ori g i nal sett i ngs I f devi ati ons are encountered the rel ay must be retested and servi ced as descri bed i n thi s manual TARGET A...

Page 24: ...def l ected about 1 32 i nch when the d i sk compl etes i ts travel Wi pe i s adjusted by turni ng the wipe adjustment screw thereby adjusti n g the pos i ti on of the brush rel at i ve to the brush stop When the t ime d i al i s moved to the posi ti on where i t hol ds the contacts just c l osed it shoul d i nd i cate zero on the time d i al scale I f i t does not and the brushes are correctly ad...

Page 25: ...ved On some model s it may be necessary to remove a resi stor or capacitor to expose thi s screw The four corner screws cl ampi ng the unit together shoul d next be removed and the ent i re top structure l ifted off Thi s g i ves access to the cup assembly and exposes the stator assembly whi ch shoul d be protected to keep i t free from dust and metal l i c parti c l es unt i l the unit i s reasse...

Page 26: ...ustments are compl ete be sure to repl ace the two red jumper l eads B i as Torque Adjustment Connect the current operat i ng and current pol ari zi ng coi l s i n ser i es by connect i ng a jumper across termi nal s 6 and 7 Apply current to termi nal s 5 and 8 and adjust the di recti onal uni t spi ral spri ng so that the unit pi cks up at 0 5 ampere The core of the di rect i onal unit has a smal...

Page 27: ...t touches the movi ng contact Next back it away two and a hal f turns to obtai n approximately 0 080 i nch gap Last ti ghten the screw whi ch secures the barrel The movi ng contact may be removed by 1 ooseni ng the screw whi ch secures i t to the contact arm and sl i di ng i t from under the screw head CLUTCH ADJUSTMENT The cl utch on the i nstantaneous overcurrent uni t can be adjusted by means o...

Page 28: ... the tool ensures the cleaning of the actual points of contact Fine silver contacts should not be cleaned with knives files or abrasive paper or cloth Knives or files may leave scratches which increase arcing and deterioration of the contacts Abrasive paper or cloth may leave minute particles of insulating abrasive material in the contacts thus preventing contact closing The burnishing tool descri...

Page 29: ...GEK 49849 F i g 1 8043474 Type JBCG51M Y1A Rel ay i n Case F ront Vi ew 29 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 30: ...GEK 49849 F i g 2 8043475 Type JBCG51M Y1A Rel ay Out of Case F ront Vi ew 30 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: ...GEK 49849 F i g 3 8043476 Type JBCG51M Y1A Rel ay Out of Case Rear View 3 1 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 32: ...GEK 49849 I I LATE R F i g 4 Type JBCG77M Rel ay Out of Case Rear View 32 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 33: ...CURREN T UNI T CTOP TOC TI M E OVE R CU RRENT UNIT M I OJ D D I R ECTIO NAL UNI T B OT S l S EAL I N UNI T 6 C 3 P 3 p 7 8 1 0 S HORT F I NG E R F ig 5 0257A6195 0 I nternal Connecti ons for JBCG51M and JBCG53M Rel ays Front Vi ew 33 D P O T PO L 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 34: ... U NI T C TQ P TOC TI M E OVE R C URREN T U N I T C M I OJ S H ORT F I NGER D D I R E CTIONAL UNI T B OT S l SEAL I N U N I T I OC ND I N S TA N T OV ERC U R R E N T U NI T NO N DI R EC T C M I D F i g 6 0257A6196 l I nternal Connecti ons for JBCG51M YlA JBCG53M Y1A and JBCG99H Y1A Rel ays Front Vi ew 34 I OC c r D P O T P O L 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 35: ...IT TOP T OC TI ME O V E R C U RR E N T U NI T M ID 0 D I R EC T I O N A L U N I T B O T S I S E AL I N U Nl T R ED J U M PER L E ADS 1 9 I O C C l C3 7 9 P3 0 p4 P O T P O L 1 0 S HO RT F I N G E R F i g 7 0257A6197 0 I nternal Connecti ons for JBCG77M Rel ay F ront Vi ew 3 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 36: ...rs NOT USED DO NOT CONN ECT TO STUD 7 8 67N J BCG51 53 OR 77 I OC I NSTANTANEOUS OVERCURRENT UN I T TOC T I ME OV ERCURRENT UN I T D D I RECT I ONAL UN I T T S I TARGET S EA L I N UN I T 5 I Q_ A 67N B D f 7 N u C t t V 1 0 0 1 TO TRANS FO RMER N E U TRAL 1 67N 52 l i 67N S l F i g 8 0148A4012 3 Typi cal External Connecti ons D i agram for Rel ay Types JBCG51M JBCG53M or JBCG77M 36 w w w E l e c t...

Page 37: ... CURRENl POLA IZATION rs NOT USED 00 NOT CONNECT TO STUD 7 8 LEGEND 1 _ _ _ _ _ 67N JOCG51 53 OR 77 l I OC I NSTANTANEOUS OVERCURREMT lM I T TOC TIME OVERCURRENT UNtT 1 6 6 7 N D D I RECT I ONAL UN I T T SI TARGET SEAL IM UN IT 1 7 IO C N Dh 11 __ J F i g 9 0273A9058 0 Typ ical External Connecti on Di agram for Rel ay Types JBCG51M Y1A and JBCG53M YlA 37 I t 67N ST w w w E l e c t r i c a l P a r ...

Page 38: ...Rel ay I I P L A R Z E DI I I F P O T E N T I AL MU LT I P L ES O F P R O DU C T P I C K U P Ep l 0c o s 6 0 J J 6 I F C U R R E N T P O LAR I Z E D 1 0 1 p c o s M U L T I P LE S O F P R O DU CT P I C K U P o 25 I f D U A L P O L AR I Z ED M U LT I P LE S O F P RO D U C T P I C K U P E I c o s 6 0 p 0 f 1 cos 0 r I 3 6 AN G L E B Y WH I CH 1 0 LAGS Ep AN G LE BY WH I CH I 0 LAG S l p Ep P O LA R ...

Page 39: ... oJ s o 1 0 1 2 1 0 80 2 o 2 5 3 o 4 o 5 o 6 o o s o t o o 1 2 1 6 20 1 6 0 _ I 10 r 9 r 8 7 VI r 01 c 4 _ 3 Q _ en 2 0 _ t 1 t 0 t I Q E 1 _ g 8 1 8 8 1 I _ADJ U Tt _EHlL I N ST UN I T CON T I NUOU S LY ADJUSTABLE 1000 800 100 700 100 500 400 300 200 100 80 10 10 50 40 30 20 10 8 1 1 01 01 07 01 05 04 03 H 01 I I 7 I 8 1 4 5 1 10 20 30 40 10 80 70 80 90 I I I I Ul MULT I PLES OF R E L AY TAP S ET...

Page 40: ...1 3 o 4 O 5 0 6 a 7 a 8 o_ 1 0 1 2 2 0 2 5 3 0 4 0 5 01 6 0 7 Q 8 0 1 0 0 1 2 1 6 f f 0 r K 1 r 10 9 I 8 f 7 Ill f f 6 co 5 c 4 1 4D rn 3 r _ 0 2 0 I r 4D E I t h 1 2 I I I I I I III I IT ADJU STI ENTS I N ST U N I T CON T I NUOU SLY A UJ U STABLE I 7 110 I 7 I II 10 1I I I f 1 I I I I iJ 41 II I I 7 I I 1 4 I I 7 I I ll 10 41 II 10 70 1010 I I I I I Ill I I I r l lllf MULT I P L E S OF REL AY TAP...

Page 41: ... 5 2 O 2 5 3 O 4 O 5 O 6 O 7 0 8 0 I 0 1 2 2 o 2 5 3 o 4 o 5 0 6 o o s o 1 o o 1 2 1 5 1 1 I 1 0 I 10 r f 9 8 __ r f 7 6 en r 5 E 4 1 t 3 Q __ 1 2 c b 0 l Q t I E 2 1 I 8 8 0 0 n i i L ADJ USTMENTS I H ST U N I T CON T I NUOU SLY DJU ST ASL E 5 7 8 1 4 5 1 10 20 30 40 50 80 70 8010 il i II I I I U UI M ULTI PLE S O F R E L AY T AP S E T T I N G F i g 14 088880274 5 Time current Characteri stic of ...

Page 42: ... j__ _ t I I C 6roo l I I I I I l I I i I I I I I I I I I I 1 j I I t 1 I I I I I 1 II l 1 i il l J I i i 1 i 4 x__ ____ I I l I I I I I I I I I I I I I I l 3Y1 1 I I i I i I i I r t I i t I 1 I t I I I I i I I I j l I r I I J I l l I I I l j r I I N I i t I I I l I I r 1 t I I J I I I I l n v _ I Q IL l c I J j n lr J J I i l i I I CD I I F i g 15 0285A6663 Representati ve Time current Characteri...

Page 43: ...I J I en I II I UJ C J _____ t i I I I I a z ttS I i I 1 I I 1 l i l i 1 ___ T _ ffi t _J 1 u UJ en I i f y 1 1 1 v 0 0 0 SON003S N l 3W il dO I d J tn 8 1 J I F i g 16 0208A8695 l Time current Character i sti c of the Non directi onal ly Control l ed I n stantaneous Overcurrent U n i t 43 t 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 44: ...I I I I I I I PERCENT OVERREACH 100 YJ i t t i r i A PftkUP lJRRENT GRAWALLY APPLI ED __ 1 50 I I 8 CURRENT SJDOENLY APPLI ED I t I _j II I I li I i 1 t 1 __ I tn t _ _ _ 1 I j LU I I 1 11 30 i t I r CHIMr c 1 t I 0 LU 0 t I 20 t t PICK UP 1 t I I 10 L t llv I I I l MAXIM t1 iI t t 1 0 I 2Q 30 ij I 50 ANGLE IN CEffi EES LAG r 60 7tt PICK UP CHI SEISMIC I I Ell 1 91 c I TI I j lo 1 0 co w E l e c t...

Page 45: ...Contact T i p H Brush Reta i ner L F E F Bu tton Contact T i p G Mov i ng Con ta c t Brush Re ta i ner A B _ _ _ _ _ c K Stati onary Con tact Support L Mo un t i ng S crew M Locknuts F ig 18 8023399 and 8027689 Low Gradi ent Contact Assembly for the Direct i onal Uni t 45 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 46: ... B STA J N L ESS ST E E L B A L L C D I A PH RAM F FLA T S P I RA L SPRI N G G C O N TA C T F i g 19 K 6077069 4 1 Barrel Contact Assembly for the D i recti onal and the I nstantaneous Overcurrent Uni t 46 F G 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: ... B A R NOT E A F T E R E N G A G I N G AU X I L I ARY B R U S H CO N N ECTIN G PL U G T R AV E LS Y4 I N C H B E FO R E E N G A G I NG T H E M A I N B R U SH O N T H E T E R M I N AL B LO C K F i g 20 8025039 Cross Secti on of Drawout Case Showing Pos i ti on of Auxi l i ary Brush 47 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: ...12 14 16 18 20 TYPE XLA13 TEST PLUG 1 3 2 4 ADJ RES 5 7 9 6 8 10 TYPE XLA13 TEST PLUG TO T I MER START 120V RATED FREQ F i g 21 Ol78A9036 0 Test Connecti ons for Check i ng the TOC Uni t 48 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 49: ...13 TEST PLUG 3 4 CD 5 6 TYPE XLA13 TEST PLUG 7 8 19 20 9 10 F ig 22 0178A9037 0 Test Connecti ons for Check i ng P i ckup of Directi onal Uni t U s i ng Current Pol arizat i on 49 120V RATED FREQ 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 50: ... 2 3 4 L TYPE XLA13 TEST PLUG 5 6 GEK 49849 17 18 7 8 19 20 RES 9 10 F ig 23 0178A9038 0 Test Connecti ons for Check i ng P i ckup of Di recti onal Un i t Us i ng Potential Pol arizat i on 50 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 51: ...ST PLUG RELAY TYPE CONNECT A J BCG 51 12 53 12 77 12 52 13 54 13 78 13 BLOCK D I RECT UN I T CONTACTS CLOSED I o B 19 _ 19 19 19 19 19 F i g 24 Ol78A9035 0 Test Connecti ons for Check i ng P i ckup of Direct i onal ly Control led IOC Uni t 51 120V RATED FREQ 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 52: ...9 1 7 1 5 1 3 1 1 0 0 0 0 0 0 0 0 0 0 1 9 8 7 5 2 0 1 8 1 6 1 4 1 2 5 05 MM S T U D NUMBER I NG 9 7 5 3 1 0 0 0 0 0 0 0 0 0 0 1 0 8 6 4 2 BACK V I EW C U TO U T S MAY REPLACE DR I L L E D HOLES P A r JE L D R I L L I NG FOR SURFACE MOUNT I NG F R O N T V I EW 5 1 6 1 8 S T U D I NC H E S MM V I EW SHOW I NG ASSEM B L Y OF HARDWARE FOR SURFACE M T G ON S T E EL PANELS F i g 25 K 6209276 5 Out l i n...

Page 53: ... r 1 r 1 r 2 4 IOC INSTANT OV E R C U R R ENT U N IT TOP TOC T I M E O V E R CU R RENT U N I T M I DDLE 0 DIR ECT O NAL U N IT BOTTOM Sf SEAL I N U N IT d 8 1 0 S H ORT FI N GER F i g 26 0273A9548 l I nternal Connections Di agram for the JBCG52M and the JBCG54M Rel ays 53 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 54: ...z t I a t 1 D P 3 P 4 r 9 8 1 0 I O C I N STANT OVERCU R RENT U N IT TOP I O C c l D POT PO L TOC TIME OV ERCU R RE NT UNI T M IDDLE D D I RECT I O NA L UN I T BOTTOM S I S E A L I N U N IT SH ORT F I N GE R F i g 27 0273A9550 I l l I nternal Connect i ons Di agram for the JBCG78M A Rel ay 54 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 55: ...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 56: ... 5 94 1100 4 93 4 92 7 89 6 85 11 81 Protection and Control GE Technology Center 205 Great Valley Parkway Malvern Pennsylvania 1 9355 1 337 I I 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 ...