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GE IFC66A, Instructions Manual

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GE�-45376 

RENEWAL  PARTS 

It  is  recommended  that  sufficient  quantities  of  renewal  parts  be  carried  in  stock  to  enab l e   the  prompt 

.p l acement  of  any  that  are  worn,  broken  or  damaged . 

When  ordering  renewa l  parts,  address  the  nearest  Sales  Office  of  the  Genera l  El ectric  Company,  specify 

quantity  required,  name  of  the  part  wanted,  and  the  comp l ete  mode l  number  of  the  relay  for  which  the  part 

is  required . 

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I 

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www . ElectricalPartManuals 

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www 

. ElectricalPartManuals 

. com 

Summary of Contents for IFC66A

Page 1: ...6A IFC66B IFC66K INSTRUCTIONS TIME OVERCURRENT RELAYS GENERAL f j ELECTRIC GEK 45376B Supersedes GEK 45376A 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 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: ... 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 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: ...MENTS G ENERAL 10 T IME OVERCURRENT UNI T 10 HI SEISM IC INSTANTANEOUS UN IT 11 H IGH D ROPOUT INSTANTANEOUS UNIT 11 H I SE I SM IC TARGET AND SEAL IN UNI T 11 INSTALLATI ON 12 INSTALLATI ON TESTS 12 PER IODIC CHECKS AND ROUTINE MAINTENANCE 13 T IME OVERCURRENT UNI T 13 HI SEISMIC INSTANTANEOUS UNIT 13 H IGH DROPOUT INSTANTANEOUS UN IT 13 HI SEISMIC TARGET AND SEAL IN UN IT 13 CONTACT CLEANING 13 ...

Page 4: ... 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 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 5: ... made by using the transient overreach curves in Figure 11 The IFC66A and IFC66B rel ays are also useful for application on the primary of a smal l l ow vol tage l oad center transformer when the secondary main protective device is an insul ated case circuit breaker In such cases the l ong time capabil ity permits the rel ay to be set sel ectivel y with the non adjustabl e l ong time thermal el em...

Page 6: ...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 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Page 7: ...or 14 connection points and a visible CT shorting bar located up front As the connection plug is withdrawn it clears the shorter contact fingers in the output contact circuits first Thus the trip circuit is opened before any other circuits are disconnected Next current circuit fingers on the case connection block engage the short ing bar located at the lower front of the case to short circuit exte...

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Page 9: ...atings are listed in Tab l e 3 TABLE 3 Model Time Overcurrent Unit One Second Ratin Any Tap K Amperes Amperes IFC66A B K 2 5 7 5 350 122500 Ratings less than one second may be cal cu l ated according to the formu la I v K T where T is the time in seconds that the current flows The continuous ratings for the time overcurrent unit ar e shown in Table 4 TABLE 4 2 5 7 5 Ampere Range Ratings Mode l I F...

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Page 11: ...movable lead located in the rear of the relay TABLE 6 Unit Tap Range Continuous One K Position Rating Second Amps Ratin J Amps L 2 4 3 7 2 8 130 16900 H 4 8 4 8 The range is approximate which means that the 2 4 4 8 may be 2 5 4 8 ampere overlap between the maximum L setting and the minimum H setting range since it has the higher continuous rating There will always be at least one Whenever possible...

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Page 13: ...seal in unit BURDENS Burdens for the time overcurrent unit are given in Table 8 TABLE 8 Min Burdens at Min Burdens in Ohms Z Model Hz Range Tap Pickup Min Tap Times Pickup Amps Ohms R Jx z 3 10 20 IFC66 so 085 307 318 153 081 063 2 5 7 5 2 5 60 102 368 382 183 097 076 Note The impedance values given are those for minimum tap of each range the impedance for other taps at pickup current tap rating v...

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Page 15: ... 0 25 0 18 0 31 0 21 0 18 0 17 CHARACTERIST ICS Pickup in these relays is defined as the current required to close the contacts from the 0 5 time dial position Current settings are made by means of two movable leads which connect to the tap block at the top of the support structure see Figure 1 The tap block is marked A through M See the nameplate on the relay for tap settings Example The 5 amp ta...

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Page 17: ...m moisture dust and metallic chips Foreign matter collected en the outside may find its way inside when the cover is removed and cause trouble in the operation of the relay ACCEPTANCE TESTS Immediately upon receipt of the relay an inspection and acceptance test should be made to insure that no damage has been sustained in shipment and that the relay calibrations have not been disturbed If the exam...

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Page 19: ...imum current at which the contacts wil l just close is determined by the tap setting in the tap bl ock at the top of the support structure See CHARACTERISTIC section The pickup of the time overcurrent unit for any current tap setting is adjusted by means of a spring adjusting ring See Figure 1 The spring adjusting ring either winds or unwinds the spiral control spring By t rning the ring the opera...

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Page 21: ...e test circuit of Figure 1 6 Setting The High Dropout Instantaneous Unit The high dropout instantaneous unit has an adjustable core l ocated at the top of the unit as shown in Figure 2 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 increas s the pickup Bring up the current...

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Page 23: ... 8 and 1 0 INSTALLAT ION TESTS The fol lowing tests are to be performed at the time of instal l ation Time Overcurrcr t Unit Set the tap block to the desired tap setting and the time dial to the 0 5 position Using the test circuit in Figure 15 gradual l y apply current until the contacts just cl ose This value of current is defined as pickup and shoul d be within three percent of tap value Check t...

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Page 25: ...ngs If deviations are encountered the rel ay must be retested and serviced as describe9 in this manual TIME OVERCURRENT UNil l Perform pickup test as described in the I NSTALLATION section for the tap setting in service 2 Perform the time tests as described in the I NSTALLATI ON section H I SE I SMIC INSTANTANEOUS UNIT l Check that the instantaneous unit picks up at the desired current level as ou...

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Page 27: ...requency and good waveform having a voltage of 1 1 0 or more with resistance l oad boxes for setting the current See TEST C I RCU IT Figure 1 5 With the tap bl ock set for the l owest tap and the time dial set where contacts are just open adjust the control spring to just close the contacts within the l imits given bel ow which are plus and minus 1 percent of the tao amps See Tab le 1 3 TABLE 1 3 ...

Page 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 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: ...hould be replaced 10 Reinstall the drag magnet assembly and check that the disk has at least 0 0 10 inch clearance from the drag magnet assembly surfaces 11 Tighten the drag magnet assembly mounting screws with 7 10 inch pounds of torque after securely seating thL assembly and positioning it according to the TIME TEST above HI SEISMIC INSTANTANEOUS UNIT AND HIGH DROPOUT INSTANTANEOUS UN IT 1 Both ...

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Page 31: ...e worn broken or damaged When ordering renewal parts address the nearest Sales Office of the General Electric Company specify quantity required name of the part wanted and the complete model number of the relay for which the part is required i6 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 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: ...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 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: ... STICS OF THE HI SE I SMIC I NSTANTANEOUS UNIT TIME CURRENT CHARACTER I STICS OF THE H I SE I SMIC I NSTANEOUS UNIT TEST CONNECTIONS FOR TESTI NG CT SECONDARY USED WITH THE I FC RELAY TEST CONNECT IONS FOR TEST I NG P I C KUP AND OPERAT ING TIMES OF THE I FC RELAY TIME OVERCURRENT UNIT TEST CONNECTIONS FOR TESTI NG P I C KUP AND OPERAT ING TIMES OF THE IFC R ELAY H I SE I SMIC I NSTANTANEOUS UNIT ...

Page 34: ...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 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: ...G RING GEK 45376 INSTANTANEOUS UNIT TIME DIAL MAIN MOVING CONTACT DRAG MAGNET A SSEMBLY FIG 1 8043007 TYPE I FC66K RELAY REMOVED FROM CASE FRONT V I EW 1 8 I 6 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 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: ...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 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 37: ...GNET AND TAP BLOCK ASSEMBLY TIME OVERCURRENT UNIT esJJ SUPPORT STRUCTURE F IG 2 80430 1 1 TYPE IFC 66K RELAY REMOVED FROM CASE REAR VIEW 19 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 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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Page 39: ..._ UNIT TSI TSI t y 0 0 2 G 5 SHORT FINGER F I G 3 0257A8339 2 I NTERNAL CONNECTI ONS FOR RELAY TYPE IFC66A FRONT V I EW 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 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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Page 41: ...GS SET Ll HI TO W FOR HIGH RAHGE AND TO L FOR LOW RANGE LINK SHOWN IN H I GH RANGE POSITION FIG 4 0257A8340 4 INTERNAL CONNECT IONS FOR RELAY TYPE I FC66B FRONT VIEW M4 W ji1 4 C QC P 21 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 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 42: ...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 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 43: ...UNIT GEK 45376 STANDARD JNST UNIT L 4 l 3 5 HI QROPOUT I _ ST SETTlNGS SHOWN IN THE HIGH RANGE CONNECT TERMINAL 6 TO E FOR LOW RANGE 6 1 r 7 10 9 FIG 5 0257A9644 l INTERNAL CONNECT I ONS FOR R ELAY TYPE I FC66K FRONT V I EW 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 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: ...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 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 45: ... z r r r 2 r w lf J I 0 w I r T I M E U N I T 4 I I 1 I I 1 0 Zl 5I 71 1111 M U LT I P L ES OF P I C K U P SETTI N G I I f 1 1 1 11 I 1 1 1 1 1 11 I 1 Ito 1 Ill 01 to 70 so 30 1 1 I I u 1 07 oo 04 11 I I I Ul F I G 6 01 0888969 1 6 0 HERTZ TIME CURRENT CHARACTER I STICS FOR R ELAY TYPE IFC66 23 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 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 ...

Page 46: ...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 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: ...6 t 5 4 z 3 t 1 f 2 l I J If _J r T I M E U N I T I 4 5 I J I I ID I 0 l U I 1 2 ll 41 Sl II 70 liN 1 U LTI PLES O F P I C K U P S E TT I N G I i l FIG 7 01 0888970 1 50 HERTZ T IME CURRENT CHARACTERI STICS FOR RELAY TYPE TFC66 24 I 000 100 100 700 100 00 200 Iao 10 70 10 so o 20 I I I I 7 I J I I l 01 z 01 07 1 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 w w w E l e c t r i c a l P a ...

Page 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 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: ... O W E R C I R C U I T B R E A K E R l J O C T R I P 8 U S a 5 2 T C 5 0 1 5 1 2 5 1 3 5 0 2 s o S A l E A S P H A S E I F I G 8 0269A301 4 0 TYP ICAL EXTERNAL CONNECT IONS FOR RELAY TYPES I FC66A AND I FC668 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 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: ...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 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: ...R O P O U T w 0 lL i N ST U N I T G a a 50 0 0 8 _J u t 0 0 0 5 t 0 C U R R E N T N O R M A L D R O P O U T J NST U N I T 5 0 A F I G 9 0269A305 5 0 MOTOR PROTECTION CHARACTER I ST I C CURVE 26 i 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 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: ...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 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 53: ... I L I A RY R E L A Y N O R M A L D R O P O U T I N S TA N TA N E O U S OV E R C U R R E N T U N I T l P O W E R C I RC U I T B R E A K E R H iGH D R O P O U T I N S TA N TA N E O U S O V E RC U R R E N T U N I T AUXI L I A RY CO N TAC T CLOSED W H E N C I R CU I T B R E A KE R I S C _O S E D T R I P C O I L F I G 1 0 0269A301 3 l TYP I CAL EXTERNAL CONNECTIONS FOR RELAY TYPE I F 66K 27 w w w E l ...

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Page 55: ... O 2 i v I I I l I I v i v I I v l I I _i 1 l I T 0 4 1 I I I I I i I I I ___ i 1 I V i I I v J I t i T D 3 T O 5 1 0 I 4 6 8 1 0 1 2 1 4 1 6 1 8 20 M U LT I P L E S O F P I C K U P F I G 1 1 0269A 1 869 0 OVERTRAV EL CURVES FOR RELAY TYPE I FC66 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 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: ...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 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 57: ...J J 8 CL CL II J t i fj ffi c UJ Q Q ij 1 0 a ffi t Q Q a II It CL CD t _ r _ 0 0 lN3J 3d N l HOV3 3AO F IG 1 2 0208A8694 l TRANS I ENT OV ERREACH C HARACTER IST ICS OF THE H I SE I SMIC INSTANTANEOUS UNIT 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 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 58: ...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 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 59: ...0 10 y I I I I v v 1 u 0 tn 0 0 8 SON003S N l 3 11 d l d FIG 1 3 0208A8695 0 TH E CURR ENT CHARACTER I ST I CS O F THE H I S E I SMIC I NSTANTANEOUS UN l 1 30 a u a u 0 w J a 1 J l t ll 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 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 60: ...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 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 61: ...O R 1 2 X C A I I A 2 R E L A Y C C I L N O T I N C I R C U I T 0 0 R E L A Y S I D E C A S E S I D E 1 2 X C A I I A I 5 6 F I G 1 4 0269A 1 787 0 TEST CONNECTIONS FOR TEST I NG CT SECONDARY USED WITH THE I FC RELAY 31 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 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 62: ...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 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 63: ...N G _ L I G H T W H E N C H EC K I N G P I C K U P R E L AY I 2 T E R M I N A L S t t 1 2 XCA I I A I REL AY SIDE i C A SE S IDE 0 0 5 5 C T J U M P E R F I G 1 5 0269Al 789 0 TEST CONNECT IONS FOR TESTING P I C KUP AND OPERAT I NG T IMES OF THE IFC RELAY T IME OVERCURRENT UNIT 32 f 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 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 64: ...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 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 65: ...K U P RELAY 2 3 4 T E R M I N A LS 0 R ELAY R ELAY S I DE S I D E CAS E C ASE S I D E S IDE 1 2 X C A I I A I 0 0 0 0 5 0 R E L AY S I D E C AS E S I D E I 5 C T J U M P E R F I G 1 6 0269Al 788 l TEST CONNECTI ONS FOR TESTING P I C KUP AND OPERAT ING T IMES OF THE I FC R ELAY H I SE I SM IC INSTANTANEOUS UNIT 33 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 w w w E l e c t r i c a l P a r...

Page 66: ...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 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 67: ... E S I S T O R 8 O r TO S T O P T I M E R 9 10 R E LA Y i R E L A Y S I D E S I D E C A SE S I D E 0 o l C A SE S I D E 0 TO I N D I C A T I N G L I G H T W H E N C H E C K I N G P I C K U P F I G 1 7 0269Al 865 0 TEST CONNECT IONS P IC KUP AND DROPOUT OF THE HIGH DROPOUT I NSTANTANEOUS UNIT 34 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 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 ...

Page 68: ...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 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 69: ...N ALS REL A Y S I D E C A SE S IDE 1 2 X C A I IA I 0 2 0 F I G 1 8 0269Al 790 0 TEST CONNECTIONS FOR TEST I NG THE HI SEISMIC TARGET AND SEAL IN UNIT USED WITH THE I FC RELAY 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 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 70: ...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 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 71: ... L EM E N T S U PP O R T STR U C T U R E CAS E C O N N E C T I O N B L O C K F I G 1 9 804271 5 CROSS SECT ION OF I FC DRAWOUT CASE SHOWING SHORTING BAR 36 __ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ 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 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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Page 73: ...L C O N N EC T I O NS 1 0 32 SC R EW S I G L _ I _2 844_ i 73MM I L 5 6 88 1 4 6 _ M I r 3 94 79t 1M I T I E Sl 0_ _ _y L EW S E I F LU S H MOU N T I NG P A N E L DB L l JJ lli 1 F tJ L l L_ OI _ I fTI NG PA N E l ___ __ ___ WA 3H E R LOC KWA S H E R 8 32 SC F EW 5U P P O RT O R T I E A N C H O R M AX 1 2 5 TH K 3HH F NU T V l E W A I O X I 2 TY P E B T T H E A D CU T T I N G C A B L ES If I I HD ...

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Page 75: ...M O U N T I NG H AX l88 P A N E L 5 N H 1 5 3 44 668 I 212 H N 94MNf S E E VIEW C I E X T E R NAL C O N N E C n ONS 10 32 SC R EWS MOU N TI NG S U R FACE S I C E I E W REC SL RFA C E M T G F O R h THK PAN E L S A N D AEO V E PAN EL D R I L LI NG E N L A R G E D V I E w e H 0 W 0 2 57A8 5 4 9 G 2 T r 7 4 E 9 2 3 7 1 2M H 6 1 MH It_ 750 j _ ___ ___ __L9NtD _ 4 7so 0 0 0 qoo T 12 0 0 5_ E 2 5 1 6 M M...

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