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INSTRUCTIONS

TIME OVERCURRENT RELAYS

TYPES

IFC95AD AND IFC95BD

GEK-49950A

Su persedes GEK -49950

GENERAL

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ELECTRIC

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Summary of Contents for IFC95AD

Page 1: ...INSTRUCTIONS TIME OVERCURRENT RELAYS TYPES IFC95AD AND IFC95BD GEK 49950A SupersedesGEK 49950 GENERAL f ELECTRIC 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: ... 1 2 H IGH SE ISMI C INSTANTANEOUSUN IT 1 2 Setti ng the High Seismic I nstanta neous U nit 1 2 H IGH SE I SMIC TARGET AND SEA L IN 1 2 Pick up a nd DropoutTest 1 3 INSTALLATION 1 3 INSTA L LATION TESTS 1 3 Time Overcurre ntU nit 1 3 High SeismicTargeta nd Seal I n U nit 1 4 Hi gh Seismic I nsta nta neous U nit 1 4 PERIOD IC CHECKSAND ROUT INE MA INTENANCE 1 4 T I ME OVERCU RRENT UN IT 1 4 H IGH S...

Page 3: ...iters Laboratories I nc APPLICATION T he Type IFC95AD and IFC95 B D relays are designed for appl ication w he re a fast i nve rse time characteristic in comb ination w ith a relatively low b u rden is req u i red A typical appl ication is illustrated by F igure 7 w here the relay is used to provide sensitive ground fau ltp rotection for eq u ipment downstream from a grounded transformer CONSTRUCTI...

Page 4: ...ed o n the upp er left side of t he cover The I FC II BD11 model relays co ntain in additio n to the above a H igh Seismic instantaneo us unit see Figure 1 The instantaneo us unit is a smal l hinged type unit w it h electrical ly separate co ntacts and is mo unted o n the f ro nt to the right of the shaft of the time overcurrent unit One of its co ntacts is no rmally co nnected in paral lel w ith ...

Page 5: ...Tab le Ill Model I FC95 Ti me OvercurrentU nit A mperes 0 5 4 0 1 0 1 2 0 TABLE Ill One Second Rati ng A ny Tap A mperes 82 1 64 K 6724 1 6896 Rati ngs less than one second may be calculated according to the formu la I v Klf w here T is the ti me i n seconds that the currentflows The conti nuous rati ngsfor the time overcurrent unit are show n i n Tables IV and V TABLE IV 0 5 4 0AMPE RE RANGE RAT ...

Page 6: ...eres t Amp eres Rating AmQeres tt L 2 10 3 7 2 so 130 16 900 H 10 so 7 S L 6 30 10 2 6 1SO 260 67 600 H 30 1SO 19 6 tTh e ra nge is approx i mate w hich mea ns t hat the 2 10 10 SO may b e 2 8 8 SO T her e wi ll always b e at least one a mpere overlap between t he max imum L sett ing a nd t he minimu m H s ett ing Whenever possible b e sure to select the higher ra nge since it has t h e higher con...

Page 7: ...r the target and seal in coils of the protective relay CONTACTS The cu rrent closing rating of the contacts is 30 amperes for voltages not exceed ing 25 0 volts The current carrying rating is limited by the rating of the seal i n u nit BURDENS Bu rdens for the time overcu rrent unit are given in Table V I I I NOTE T he impedance values g iven in Table V I I I are those for the minimum tap of each ...

Page 8: ...O 0 992 0 634 0 480 0 4S7 2 50 60 H 10 50 10 0 070 0 024 0 074 0 072 0 071 0 070 L 6 30 6 0 110 0 078 0 135 0 095 0 081 0 079 6 1SO 60 H 30 150 30 0 022 0 005 0 023 0 022 0 022 0 022 L 2 10 2 0 62S O S42 0 827 O S28 0 400 0 380 2 50 so H 10 50 10 0 058 0 020 0 062 0 060 0 059 0 058 l 6 30 6 0 092 0 065 0 112 0 079 0 068 0 066 6 1SO 50 H 30 150 30 0 018 0 004 0 019 0 018 0 018 0 018 CHARACTERISTICS...

Page 9: ...SE ISMIC INSTANTANEOUS UN IT The i nstantaneous u n it h as a 25 to 1 range w ith a tapped coil There are h i gh and low ranges selected by means of a l i nk located on the top of the support structu re see Figu re 1 The time cu rrent curve for the i nstantaneousu nit is show n i n Figu re 9 H IGH SE ISMIC TARGET AND SEAL IN UN IT The target and seal in u n ith as two tap selections located on the...

Page 10: ...olutions tangled or touching each other 3 The armature and contacts of the seal i n u nit as w ell as the a rmatu re and contacts of the instantaneous unit should move freely w hen operated b y hand there should b e at least 1 64 inch w i pe on the seal in and the instantaneous contacts 4 The targets i n the seal in u nit and in the i nstantaneous u n it must come i nto view and latch w hen the ar...

Page 11: ...p of the time overcurrent unit for any current tap setting is adj usted by means of a spring adj usti ng ring see Figure 1 The spring adj usting ring either w inds or unwinds the spiral control spring By turning the ring the operating cu rrent of the unit may b e b roug ht i nto agreement w ith the tap setting employed i f this adjustment has b een d istu rbed This adjustment also permits any desi...

Page 12: ...to repeat this operation until the desired picku p valu e is obtai ned Once the desired pickup value is reached tighten the lock nut CAUTION Refer to Table VI for the continuous and one second ratings of the instantaneous unit Do not exceed these ratings when applying current to the instantaneous unit T he range of the i nstantaneous u n it see Tab le V I must be obtained b etween a core position ...

Page 13: ...ted on a vertical surface The outl ine and panel d rillings are show n in Fig ures 1 5 and 1 6 Fig ure 1 5 shows the semi flush mounting and Figure 1 6 show s various methods of surface mounting The internal connections diagrams for the relays are show n in Figures 3 and 4 Typical external connections are show n in Figure 7 INSTALLATION TESTS The fol low ing tests are to be performed at the time o...

Page 14: ...t that a period ic test prog ram be followed It is recognized that the interval b etween periodic checks w ill vary depending u pon environment type of relay and the user s experience w ith testing U ntil the user has accumulated enou g h ex perience to select the test interval best su ited to his individual requ irements it is suggested that the pointsl isted b elow be checked at an interval of f...

Page 15: ...tacts j ust close can be adjusted by runn ing t he stat ionary contact brush in or out by means of its adjusting screw W ith t he contacts j ust clos in g at t he zero 0 t ime dial setting ther e should b e suff icient gap b etween the station ary contact brush and its met al ba ck ing str ip t o ensur e a pprox i mately 1 3 2 inch w ipe The pick up of the un it for any current tap setting is adju...

Page 16: ...ting ti me as l isted in Table X III TABLE X I II Time Seconds Relay Hz Minimum Max i mum 50 0 578 0 61 2 IFC95 60 0 5 1 0 0 540 Although a time between the l isted Minimum and Maximum w ill be acceptable it would be preferable to adj ust the operating time asnear as possible to 0 525 secondsfor 60 hertz relays and 0 595 seconds for 50 hertz rel ays The d rag magn et assembly should b e approx ima...

Page 17: ...d play Tig hten the jewel bearing set screw to 2 5 3 5 inch pounds of torq ue Rotate the disk through the electromagnet gap The disk should clear the gap surfaces by 0 0 1 0 inch and be within 0 005 inch flatness If the disk is n ot within 0 005 inch flatness the disk should be replaced 1 0 Reinstal l the drag assemb ly an d check that the disk has at least 0 0 1 0 in ch clearance from the drag ma...

Page 18: ...ments may affect the Seismic Fragility Level it is advised t h at no mechanical adjustmentsbe made if seismic capab il ity is of concern RENEWAL PARTS It is r ecommended t hat sufficient q uant it ies of renewal partsbe carr ied in stock to enable t h e prompt replacement of anythat are worn brok en or damaged W hen order ing r enewal parts address t he nearest Sales Office of t he Gen er al Elect...

Page 19: ...3 24 2 5 InstantaneousUn it 26 9 Time C urrentCharacteristics of the H igh Seismic InstantaneousUn it 1 0 TestConnections for Testing CT Secondary used w ith the IFC Relay 1 1 TestConnections for Testing P ick u p and Operating Times of the Time OvercurrentUn it 1 2 TestConnections for Testing Pickup and Operating Times 27 28 29 of the H igh Seismic InstantaneousUn it 3 0 13 TestConnections for Te...

Page 20: ...L SPRING ADJUSTING RING GEK 49950 TIME OVERCU RENT TAP SELECTORS INSTANTANEOUS UNIT ADJUSTABLE CORE IN STANTANEOUS UNIT TIME DI A L MAIN MOVING CONTACT DR AG MAGNET ASSEMBLY Figure 1 8043006 Type IFC95B D Relay Removed From Case FrontV iew 20 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 21: ...CTURE BOTTOM JEWEl BEARING GEK 49950 U MAGNET AND TAP BlOCK ASSEMBlY TIME OVERCURRENT UNIT Figure 2 804301 0 Type IFC95B D Relay Removed From Case RearV iew 2 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 22: ...TA TANE J SETTINGS SET LINK TO H FOR HI H RANGE ANDTC L FOR LOW RANGE LINK SHOWN IN HIGH RANGE POSITI N SHORT FINGER TE SI I l l t 12 11 INST r 1 I I I I I II I I t 14 6 13 Figure 4 0208A85 15 1 Internal Connections for Relay Type IFC95BD Front V iew Revised s in ce last issue 22 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 23: ...lJ ___J 2 a LU I 1 I 2 TIME UNIT 4 5 I 7 I I 10 20 H 40 50 10 70 IDM MULTIPLES OF PICK UP SETTING I I I 11 111 I i I i i i i I I I I I IIIIUII I I I I I I U IIi Figure 5 0 1 0888966 1 60 Hertz T ime C urrentCharacter istics for RelayTypes IFC95AD and IFC95B D 23 1 1 000 101 100 100 100 400 zoo 00 IO 10 00 40 10 20 1 1 I I J I I I 2 01 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 24: ... f 5 f r f 4 UJ f I 1 f 3 _j 2 C __1 Cl I w __ I 1 2 f _ I II T I M E U N I T f I I 1 l I I I i 4 6 7 8 9 10 20 38 4 1 50 10 70 toto M U LT I P L ES O F P I C K U P SETTI NG Figure 6 0 1 0888965 1 50 H ertz Time C urrentC haracteristics for Relay Types IFC95AD and IFC95B D 24 I I 1 1 1 000 100 100 700 100 500 400 300 200 00 70 10 1 I I 7 I 3 2 I 1 l 07 oo 03 02 w w w E l e c t r i c a l P a r t M ...

Page 25: ... S I I 5 1 T SI 1 2 t 1 3 1 15 0 N A L A R M OR R E MOTE I N DI CAT I O N N OT E 5 0 DEV I C E P R F S E N T O N LY I N B O MO D E L Fig ure 7 0275A3836 Typical External Connections for Relay Types IFC95AD and I FC95BD 25 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 26: ...8 a 0 0 t t _ I a i ffi c LU 0 f 0 ij 1 0 Q ffi I 0 as 0 a fg a f II 0 t OJ 0 1N3J 3d N l HOY3H 3AO Figure 8 0208A8694 2 T ransient Overreach Characteristics of the H igh Seismic Instantan eousUn it 26 1f f 0 _ I w LU 0 z g 0 rl 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: ... o v 7 v v u 0 0 0 SON003S N l 3W il dn 8 1 d I r I I I I 1 J I J ti l 8 Figure 9 0208A8695 Time CurrentCharacteristics of the High Seismic InstantaneousUnit 27 0 f 0 c o u fl l L 0 V w j 10 J t C 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 28: ...E C A S E S I D E 6 1 2 X C A I I A I O R 1 2 X C A I I A 2 1 2 XG A I I A I L_ _ G A S E S I D E 5 6 TE S T C O N N E C T I O N S F O R T E S T I N G G T S E C O N D A R Y U S E D W I T H T H E I F G R E L A Y Figure 1 0 0269A 1 787 1 TestConnections for Testing C T Secondary used w ith the IFC Relay 28 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: ...E R M I N A LS r 1 2 X CA I I A I u REL AY SIDE 1 G A S E S IDE 0 0 5 G R E L A Y S I D E C A SE S ID E 0 5 G T J U M P E R T E S T G O N NECTIC N S F O R T E STI NG P I C K U P A N D O P E R AT I NG T I ME S O F T H E l F G_ R E L AY T I M E O V E R C U RRE N T U NI T Figure 1 1 0269A1 789 TestConnections for Testing Pick u p and Operatin g Times of the Time OvercurrentUn it 29 w w w E l e c t r ...

Page 30: ...DE 0 2 0 3 4 R E LAY SI D E C ASE SIDE 0 0 5 0 I I I o I R EL AY I S ID E eASE l S DE 5 C T J U M P E R TEST CO NNECT IO NS FO R TESTING P IG K U P A N D O PERAT I N G TIMES O F T HE F G R E LAY I N STA N TA N EO U S U N I T Figure 1 2 0269A 1 788 1 TestConnections for Testing Pickup and Operatin g Times of the H igh Seismic InstantaneousUn it 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...

Page 31: ...I D E C A SE S IDE 1 2 X C A I IA I 0 2 o TES T C O NNEC TIO NS FOR TE STING T H E T A R G E T A N D S E A L I N U N IT USED W IT H T HE I FC R E l AY Figure 1 3 0269A1 790 TestConnections for Testin g theH igh Seis micT arget and Seal In Unit 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: ...NECTION PL U G CONTACT FING ERS DRAWOUT ELEMENT SUPPORT STRUCTURE NECTION BLOCK Figur e 14 80427 1 5 Cross Section of I FC Draw Out Case Show ing Shorting Bar 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: ...75 86MM CL TOUT 1 6 75 0 1 7 1 t 1M E X T E RNAL C O N N EC T I ONS 1 0 32 SC R EWS I 1 4 5 686 I SJPE VIEW SEMI FLUSH MOU N T I NG 1 44MM PANEL DHI LLING _ S E MI F LUSH MOU N TI NG WASH E R LOC KWAS H E R a 32 SC F EW t T I O X I Z TY P E 6 T T H R E A D CU T T I N G T I E 5U P P O R T O F T I E A N C H O R C AB L E T I E C A B LES tl I I V l E W A HO W 02 57A 8 549 G t SC R E W V I E W 0 Fig ur...

Page 34: ...__f__ o r I 6 124 5 6 H M I _1 I ST U D NUMBE R I NG OVE R S ic E WAS H E R S WAS H E R 8 3 6 SC R E W NUT MOU N TI NG S U R FAC E L 0 s oo o 128HH PAN EL QRI_L LI NG L R E HOV E K NO C KOUT MOU N ll NG SURFACE S I D E VI EW REC SURFA C E M T G FOR MT H K PAN ELS A N 0 ABOV E_ E N L A R G E 0 V I E W B I H 0 W 0 2 5 7A8 5 4 9 G 2 RE M OVE K N OC K O U T E N LA RG E D VI EW c H O W 0 2 5 7A 8 54 9 ...

Page 35: ...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: ...5 89 Meter and Control Business Department General Electric Company 205 Great Valley Parkway Malvern PA 19355 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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