Related Manuals for GE JBC51M
Summary of Contents for GE JBC51M
- Page 1 INSTRUCTIONS GEK-49848C PHASE DIRECTIONAL OVERCURRENT RELAYS TYPES JBC51M JBC51M(-)Y1A JBC51P JBC52M JBC52P JBC53M JBC53P JBC54M JBC77M JBC77P JBC78M GENERAL ELECTRIC...
- Page 3 GEK-49848A PHASE DIRECTIONAL OVERCURRENT RELAYS TYPES JBC51M JBC51M(-)Y1A JBC51P JBC52M JBC52P JBC53M JBC53P JBC54M JBC77M JBC77P JBC78M DESCRIPTION The Type JBC relays are phase directional overcurrent relays that are used primarily for the protection of feeders and transmission lines. They are available with inverse, very inverse, or extremely inverse time characteristics.
- Page 4 .e., t he 1 1 a 1 1 pha s e rel ay u s es 1 1 a1 1 pha s e c urrent a n d "b-e" vol ta ge, etc.
- Page 5 GEK-49848A The re ason for t h i s i s that rel ays mus t be al l u po n the sys tem generati ng s etu p. s et to be s el ecti ve wi th maxi mum faul t c u rrent fl owi ng. For faul t currents bel ow t h i s val ue, the o pe rati ng ti me becomes greater as the c urrent i s d e creased.
- Page 6 GEK-49848A The red jumpe r l ea ds between studs 1 8 a nd 1 9; 1 9 a n d 2 0 are l oc a ted i ns i de the ca s e on the c radl e bl ock and may be re moved to pro v i de e xternal to rque control o f the ti me o ve rc urrent u n i t ( TO C ) a nd the i ns ta n taneous o verc urrent u n i t ( I OC ) , res pecti vel y .
- Page 7 E to re ferenced i n Tabl e 1. For t he H ran ge, connect ead T to termi nal 1 5 and the a u xi l i a ry te rmi n al that i s mounted o n te rmi n al 1 5.
- Page 8 T he two a mpere t a p s ho u l d be u s ed wi th tri p co i l s t ha t take two amperes o r more at mi n i mum control vol ta ge, pro vi ded the c urrent do es not e xceed 3 0 amperes at the maxi mum con trol vol tage.
- Page 9 GEK-49848A RESET (TI ME OV ERCURRENT UN IT) I nvers e time overcu rrent units reset a t 90 percent of t he m1n1mum picku p c urrent, very in ve rse time u nits at 8 0 percent and e xtremel y in ve rse time units at 85 percent.
- Page 10 Burden O hm s (Z) M i n . P i ckup O hms T imes P i cku p I ns t . U n i t Hz Ran ge Ran ge P i ckup Amps Amps Amps 6-30 0.110...
- Page 11 I OC (i ns tantaneous o vercurrent ) un i t and two tar get s ea l - i n un i ts mounted i n a l ar ge doubl e-ended drawo ut ( L2 ) case .
- Page 12 . cha n ge the s ta t i onary contact moun t i ng spr i ng, remove the contact barrel a n d s l eeve as a compl ete un i t a fter l oosen i n g t h e s c rew at the front o f t h e contact bl ock .
- Page 13 2 5 - to one total ran ge o bt a i ned by us i n g a ta p ped co i l wh i ch has a fi ve- to-one l ow ran ge and a fi ve- to-one h i gh range;...
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Page 14: Rece I V I Ng, Handling And S Torage
I mmed i atel y upo n rece i pt o f a rel ay, exam i n e i t for any dama ge sus t a i ned i n tra n s i t . I f i njury o r d ama ge... -
Page 15: Mechanical Inspection
GEK-49848A MECHANI CAL I NSPECT I ON (roc) The rota t i n g s ha ft end pl ay s houl d be 0 . 015- 0 . 020 i nch . The contact ga p s houl d be 0 . 075- 0 . 085 i nch . There s houl d be no noti cea bl e fri cti o n i n the rota t i n g s t ructure . -
Page 16: Drawout Relays, General
0.2 ampere ta p. When the tri p co i l current ran ges from two to 30 amperes at the m i n i mum control vol ta ge, the ta p s crew s houl d be pl aced i n the 2.0 ampere t a p. - Page 17 Furt he r adjus tment o f thi s sett i ng i s sel dom requi red; i f i t i s requi red, because o f i n suffi c i ent ran ge of the va ri a bl e res i s tor, i t s houl d never be nece s s a ry to wi nd up the control s pr i n g adjus ter more than 30 d e grees ( o ne notch ) o r unw i nd i t more than 90 de grees ( t hree notches ) from the factory setti n g .
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Page 18: Installation
I f the s etti n g has not been c ha n ged, i t w i l l be n eces s a ry to cha n ge t h i s setti n g i n order to open the t i me overcurren t un i t co nta c ts . - Page 19 Whene v er pos s i bl e, a l ways s el ect the h i gher ran ge s i nce i t ha s a h i gher con t i nuous rat i n g .
- Page 20 AC v o l ta ge sup p l y a c ro s s termi n a l s 19 a nd 20 a �...
- Page 21 The 5 0 ohm fi xed res i s to r s houl d be re pl aced w i th a n adjusta bl e re s i s to r c a pa bl e o f prov i d i n g the curre n t ra n ge i s ted i n Tabl e 1 3 for the rel ay type and ra t i ng i n que s t i on .
- Page 22 C heck t h i s by i ns e rt i n g a 0 . 01 0 i nc h feel er ga ge between t he fron t hal f o f the s ha ded pol e w i t h the a rmature hel d c l o s ed .
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Page 23: Contact Clean Ing
GEK-49848A CONTACT CLEAN ING For cl ean i n g f i ne s i l ver contacts, a fl exi bl e burn i s h i n g tool s houl d be us ed . Th i s cons i s ts o f a fl e x i bl e stri p o f metal wi th an etched roughened surfa ce, resembl i n g i n e ffec t a s uper f i ne fi l e . -
Page 24: List Of Illustrations
GEK-49848A LI ST OF I LLUSTRAT I ONS Type JB C51M ( - ) Y 1 A Rel ay i n Case ( Fron t V i ew ) F i g . 1 ( 804346 6 ) F i g . 2 ( 8043467 ) Type JB C51M ( - ) Y1 A Rel ay Removed from Case ( Front V i ew ) F i g . - Page 26 GEK-49848A Fi g . 2 ( 8043467 ) Type JB C51M ( - ) Y 1 A Rel ay Removed from Case ( Front V i ew )
- Page 27 GEK- 49848A Fi g . 3 ( 8043468 ) Type JB C51M ( - ) Y I A Rel ay Removed from Case ( Rear V i ew )
- Page 28 GEK- 49848A F i g . 4 ( 8043469) Type JB C77M Rel ay Removed from Case ( Rear V i ew )
- Page 29 5 1 - S E A L-I N U N I T F i g . 5 ( 0257A6 1 74 ) I n te rnal Connec t i ons for JBC51M a nd JB C 5 3M Rel ays ( Fron t V i ew )
- Page 30 I O C - I N S TANT. OV E R C U R RE N T U N I T < T OP\ * = S H O R T F I N GE R T OC -T I M E OV E R CURRE NT U N I T < M I D )
- Page 31 GEK-49848A RED J UM P E R LE AD � TO C WOUND SHAD I N G C OILS R :S W H E N U S ED I O C P O T. O PE R. P O L . r o c I O C -I N STA N T.
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Page 32: Ove Rcu R Rent
GEK- 49848A R E D J U M P E R LEA DS WOU N D S HADING C O I L S S I. ro c OPER P O T. P O L. TO C OVE RCU R RENT IOC •... - Page 35 GEK-49848A R E O J U M P E R LEAD � � - T OC - S f P O T. O PE R P O L ro c I OC - I NSTANT. OVERCU RRENT U NI T CTOP > = SH ORT F l N G E R T O C - T I M E OVERCU RR E NT U N I T 0-4 J O.
- Page 38 G E K-49848A 67-1 67-1 � 67-1 S I M I LAR C I RCU I TS FOR OTH E R TWO RELAYS NOT E: RELAY OPERATES 67-1 � FOR FAU LTS I N D l RECT I ON O F ARROW .
- Page 39 AM P ER E S F i g . 12 ( K- 6 1 54284- 2 ) D i rect i onal Un i t T i me-cu rren t C ha racter i s t i c for Vol ta ge...
- Page 40 GEK- 49848A I I I U l l • I I 0 !10 IO lO IO IO g .t .7 • 1DDD FXTn! C £0 R/lt: C F ( BOG � f F- W ) • DO A DJ U STMEti T S RAT I N GS T i tl E UN I T T AP S T I M E UN I T...
- Page 41 GEK- 49848A I I 1 1 1 1 1 1 I I 1 1 1 1 1 70 10 10 1 • 1 1 11 I .7 .I .I 1 ..1000 r n m:. r c f i H I ( 2CG ' r � • F � � �...
- Page 42 G E K- 49848A I I 1 1 1 1 1 1 ... 40 10 • •• •• .I .7 .I .I I 1 10 1000 ICKI • tXTE�'CEC f'M ' H ( 80C � rF<I E:: ) ---- - - · ·...
- Page 43 G E K-49848A i : ; • I I . . ---�·-· ��-- --·--··· � : i ; : : I , I I i ..> : + I i ! ' . ' • " •...
- Page 45 GEK- 4 9848A � � iJS >< v � - � CL. � -- -- - - �� (I) - - � � >- -· L..J :j � ..1 � � >- ..1 � � � > � � � "...
- Page 48 GEK- 49848A A RMATU RE O Pf RATI NG ARM RES I DUAL SCR EW LOC K N U T POLE P I E C E Fi g . 21 ( 80 1 2 1 06 ) Typi cal Tel e phone Rel ay Type Aux i l i ary U n i t U sed i n JB C Rel ays...
- Page 49 GEK- 49848A C O N N EC T I N G P L U G M A I N B R U S H B LOC K A U X I L I A R Y T E R M I N A L B LO C K S H O R T I N G B A R E N G A G I N G A U X I L I A R Y B R U S H...
- Page 50 GEK-49848 P A N E L L O C A T I ON ( 4 ) 5 / 1 6 - 1 8 S T U D S SEM I - F L U S H S U R F A C E F O R S U R F A C E M T G .
- Page 52 Meter a n d Con trol Business Depa rtment General Electri c Com p a n y Protect1on a n d Control G reat V a l le y P a rkway 1 9 3 5 5 - 1 3 3 7 M a l ve rn, Pe n ns ylva n ia...