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Courtesy of NationalSwitchgear.com

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Summary of Contents for IAC

Page 1: ...GEK 86054C INSTRUCTIONS TYPE IAC TIME OVERCURRENT RELAYS TYPES IAC66A IAC66B IAC66C u I i i h T 5 GENERAL ELECTRIC Courtesy of NationalSwitchgear com ...

Page 2: ...ANTANEOUS UNIT Setting the Instantaneous Unit Pickup Test TARGET AND SEAL IN UNIT Pickup and Dropout Test 4 5 6 6 8 8 9 9 9 10 10 10 10 11 11 11 12 12 12 12 12 13 13 INSTALLATION TIME OVERCURRENT UNIT TARGET AND SEAL IN UNIT INSTANTANEOUS UNIT PERIODIC CHECKS AND ROUTINE MAINTENANCE TIME OVERCURRENT UNIT INSTANTANEOUS UNIT TARGET AND SEAL IN UNIT CONTACT CLEANING SYSTEM TEST SERVICING TIME OVERCUR...

Page 3: ...equate margin such as 50 or more Typical pickup settings for the two overcurrent units are as below Application requires The TABLE I PICKUP SETTING MULTIPLES OF MOTOR FULL LOAD CURRENT UNIT 1 15 to 1 4 51 TOC Time overcurrent unit Normal Dropout Instanta neous Overcurrent Unit 8 to 15 50 I0C A The IAC66C relay is similar to the IAC66A and IAC66B relays except that the time unit and instantaneous u...

Page 4: ...y the tap selected on the target and seal 1n coll as Indicated 1n Table IV If the tripping current exceeds 30 amperes use an auxiliary relay that is connected such that the tripping current does not pass through either the contacts or the target and seal in coils of the protective relay TABLE III INDUCTION UNIT COIL RATINGS FORMS 51 AND UP SHORT TIME ONE SECOND RATING AMPS CONTINUOUS CURRENT AMPS ...

Page 5: ... impedance 50 hertz impedance 2 2 0 05 0 45 2 0 0 37 2 3 2 0 0 2 0 05 0 5 8 3 0 24 0 65 50 42 0 54 STANDARD INSTANTANEOUS UNIT Table V lists the The instantaneous unit is designed to use one of several coils pickup range continuous current ratings and short time rating of each of these coils for forms 1 through 50 TABLE V STANDARD INSTANTANEOUS UNIT COIL RATINGS CONTINUOUS CURRENT AMPS SHORT TIME ...

Page 6: ...to rotate with a vertically suspended shaft but is restrained in one direction by a spring When energized with an alternating current of proper magnitude set by the tap position the electromagnet produces out of phase fluxes at its pole faces These fluxes interact with induced currents in the disk to produce a torque on the disk When this torque exceeds the restraining force of the spring the disk...

Page 7: ...5 52 5 6 7 0 13 50 1 5 43 7 5 6 0 13 2 5 7 5 60 2 5 18 8 2 5 0 13 50 2 5 15 7 2 1 0 13 4 0 12 60 4 7 4 0 95 0 13 50 4 6 2 0 79 0 13 For forms 51 and up the burden of the induction unit is as shown in Table VIII TABLE VIII BURDENS OF INDUCTION UNIT COILS FORMS 51 AND UP PICKUP RANGE AMPS VOLT AMPS AT FIVE AMPS CALCULATED FROM INPUT AT MINIMUM PICKUP I Zl FREQ IMP POWER FACTOR Hz TAP OHMS 0 6 1 8 60...

Page 8: ...t is tabulated in Table IX TABLE IX BURDEN OF STANDARD INSTANTANEOUS UNIT IMPEDANCE OHMS POWER FACTOR VOLT AMPStt FREQ PICKUP RANGE AMPS HZ AMPS 12 4 310 0 84 0 5 2 50 5 13 2 0 78 330 60 5 0 77 94 3 75 1 50 5 4 0 71 100 4 0 60 5 0 77 23 0 94 8 50 5 2 0 71 1 0 25 60 5 0 23 0 77 16 5 5 8 50 4 0 71 6 2 0 25 5 60 0 77 0 9 0 04 10 5 50 40 0 71 1 0 0 04 5 60 0 01 0 77 0 23 50 5 20 80 0 71 0 01 0 25 60 5...

Page 9: ... pickup Relay construction is illustrated in Figures 1A and IB RECEIVING HANDLING AND STORAGE This relay when not included as part of a control panel will be shipped in a carton designed to protect it against damage Upon receipt immediately examine the relay for any damage sustained in transit evident file a damage claim at once with the transportation company and promptly notify the nearest Gener...

Page 10: ...gage the connecting plug or test plug before the main brushes do This will prevent Current Transformer CT secondary circuits from being opened See Figure 1 ELECTRICAL TESTS DRAWOUT RELAYS GENERAL Since all drawout relays in service operate in their cases it is recommended that they be tested in their cases or an equivalent steel case In this way any magnetic effects of the enclosure will be accura...

Page 11: ...t for any current tap is adjusted by means of a spring adjusting ring just above the control spring See Figure IB The ring may be turned by inserting a screw driver in the notches around the edge By turning the ring the operating current of the unit may be brought into agreement with the tap setting employed if for some reason this adjustment has been disturbed This adjustment also permits any des...

Page 12: ...he pickup Bring up the current slowly until the unit picks up It may be necessary to repeat this operation until the desired pickup value is obtained Once the desired pickup value is reached tighten the locknut CAUTION The instantaneous unit is rated 1 5 times minimum pick up test current on too long as it may damage the unit Do not leave the Pickup Test With the unit connected for high range oper...

Page 13: ...il the seal in unit drops out See Table XI 5 TABLE XI DROPOUT CURRENT PICK UP CURRENT TAP 0 15 0 195 1 50 1 95 050 OR MORE 55 OR MORE 0 2 2 0 INSTALLATION The following tests are to be performed at the time of installation TIME OVERCURRENT UNIT Using the test circuit in Figure 9 Reduce the This Set the tap screw in the desired tap apply approximately twice tap value until contacts just close curre...

Page 14: ... requirements it is suggested that the points listed below be checked at an interval of from one to two years These tests are intended to make sure that the relays have not deviated from their original setting If deviations are encountered the relay must be retested and serviced as described in this manual TIME OVERCURRENT UNIT 1 Perform Pickup Test as described in the ACCEPTANCE TESTS section for...

Page 15: ...just close The point at which the contacts just close can be adjusted by running the This screw stationary contact brush in or out by means of its adjusting screw should be held securely in its support With the contacts just closing at No 0 time dial setting there should be sufficient gap between the stationary contact brush and its metal backing strip to ensure approximately 1 32 wipe Connect the...

Page 16: ...tting check the contact closings at 2 and 10 times tap value These closing times must be within the limits shown on Table XII TABLE XII 60HZ MIN SEC MAX SEC 2 x Tap 42 6 49 0 12 3 10 x Tap 10 7 INSTANTANEOUS UNIT 1 Both contacts should close at the same time The backing strip should be so formed that the forked end front bears against the molded strip under the armature 2 With the armature against...

Page 17: ... When ordering renewal parts address the nearest Sales Office of the General Electric Company specify the quantity required and the name of the part wanted and the complete model number of the relay for which the part is required Since the last edition changes have been made 1n Table III and the Immediately following text and in Figure 3A 17 Courtesy of NationalSwitchgear com ...

Page 18: ...m Type IAC66B Forms 51 and up Internal Connections Diagram for Type IAC66C Relay Front View Internal Connections Diagram Type IAC66C Forms 51 and up Outline and Panel Drilling Diagram Type IAC66 Relays Time Current Curve for the Long time Overcurrent Unit Operating Time Versus Current for the Standard Instantaneous Unit Photograph Cross Section of Drawout Case Showing Position of Auxiliary Brushes...

Page 19: ... d i IIM1 i gpl il I h 1 I SrI i I M i li I iiillill id ilTiiliiijifil i PM l ciuki iJIICMi Figure 1A 8Q39J70 Photographs Type IAC66B Relay Quit of Case 3 4 Front VI r CONtiCL H PIlNB INDUCTION UNIT sv a CONliDL KJSr DitC U MlCh T Figure IB fl03Mfll Photograph rype IAC66Q Relgj Out of Case Rear Viev w T9 Courtesy of NationalSwitchgear com ...

Page 20: ...NDUCTION UNIT in SEAL IN UN I T LJ V V V V V V V V o 5 1 O 6 2 INTERNAL CONNECTIONS FRONT VIEW SHORT FINGER Figure 2A 6209658 10 Internal Connections Diagram Type IAC66A Relay 20 Courtesy of NationalSwitchgear com ...

Page 21: ...GEK 86054 INDUCTION UNIT TSTT TSI X V M v V V V V o o 6 2 o o I 5 SHORT FINGER Figure 2B 0257A8339 5 Internal Connections Diagram Type IAC66A Forms 51 and up 21 Courtesy of NationalSwitchgear com ...

Page 22: ...GEK 86054 INDUCTION UNIT SEAL IN UNIT INSTANT UNIT a jj T T y y x V V V 6 3 1 5 o 2 6 SHORT FINGER Figure 3A 6209661 11 Internal Connections Diagram Type IAC66B 22 Courtesy of NationalSwitchgear com ...

Page 23: ...ANGE OPERATION FOR HIGH RANGE OPERATION CONNECTION B D TO TERMINAL NO 6 A f C TO TERMINAL NO 4 A C S B D 6A O INSULATED STANDOFF v Jd v E V V v V 4 O O SHORT FINGER 5 3 I o o 6 2 Figure 3B 0285A6667 Internal Connections Diagram Type IAC66B Forms 51 and up 23 Courtesy of NationalSwitchgear com ...

Page 24: ...N UN I T SEAL I N UNIT X T J r v V V V V V V V V V V V o 9 5 1 O 10 6 2 INTERNAL CONNECTIONS FRONT VIEW SHORT FINGER Figure 4A K 6375694 1 Internal Connections Diagram for Type IAC66C Relay Front View 24 Courtesy of NationalSwitchgear com ...

Page 25: ...NECT TO TERMINAL NO 6 T C TO TERMINAL NO 4 INDUCTION UNIT SEAL IN UNIT INSTANTANOUS UNIT lc A B D 6A Qy v v F x V V 4 V V V I INSULATED STAND OFF o 5 9 O 10 6 2 SHORT FINGER Figure 4B 0285A6747 0 Internal Connections Diagram Type IAC66C Forms 51 and up 25 Courtesy of NationalSwitchgear com ...

Page 26: ...7 56MM r i t CUTtlUT 76MM f f 4 3 7 5 11 1MM i 1 8 8 1 2 223MM i 3 9 0 6 1 99MM 1 4 2 8 1 108MM i JL o 1 4 6 8 37MM i 3 I 1 7 1 8 18MM 2 5 0 2 843 72MM u 6MM L _ 218 5MM PANEL 218 500 5 2 5 5MM 12MM T Y P I C A L 133MM 5 6 8 7 144MM 3 4 DRILL 10 HOLES 19MM PANEL DRILLING FOR SEMI FLUSH MOUNTING FRDNT V I E W PANEL DRILLING FDR SURFACE MOUNTING FRONT VIEW 5 16 18 STUD 3 0 76MM V I E W SHOWING ASSEM...

Page 27: ...X X Y x Yo S s X x N X 9 to 10 X X 8 x V X X I X X X X 7 s v 7 X X X X 6 X X X X w n 5 o 5 5 Q x X X 2 z c Y O 4 4 m X u u z v X x m tn Z 3 3 X X m S n V U3 O N X X s Z X X p 2 2 O 2 o x X w X Q x x X X E 1 I l 7 7 8 5 5 4 4 J 1 1 09 01 08 08 07 07 01 M 05 05 4 04 03 03 02 02 01 01 5 8 7 8 I 1 4 9 7 I 8 10 20 10 40 SO ID 70 0t0g S I 1 S 528 M U L T I P L E S O F R E L A Y T A P S E T T I N G 8 N f...

Page 28: ...ANTANEOUS UNIT OPERATING TIME 0 2 0 8 A 8 6 9 5 025 H CQ C 5 fD O 020 rv ST n O i LU i w a 015 m i 3 00 r j PJ oo y co c r O Pi Q 3 pi o g 010 00 a 5 3 to c r r 005 C 5 fD 3 c h O 9 10 8 6 7 4 5 3 1 5 2 MULTIPLES OF PICKUP ...

Page 29: ...ERMINAL BLOCK SHORTING BAR AUXILIARY BRUSH NOTE AFTER ENGAGING AUXILIARY BRUSH CONNECTING PLUG TRAVELS 1 4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL BLOCK Figure 8 8025039 Photograph Cross Section of Drawout Case Showing Position of Auxiliary Brushes 29 Courtesy of NationalSwitchgear com ...

Page 30: ...6 6 6 0 6 1 2 3 4 0 O O O O 7 8 10 6 d XLA13 TEST PLUG A VARIABLE RESISTOR L TO T V E R START TO ACCURATELY REPRODUCE RELAY CHARACTERISTICS ALL TESTS SHOULD BE MADE WITH RELAY IN CASE J 1 WIN RECOMMENDED VOLTS 120 AT RATED FREQUENCY Figure 9 6154399 7 Test connections for Testing Pickup Time Curve of IAC Relays 30 Courtesy of NationalSwitchgear com ...

Page 31: ...Courtesy of NationalSwitchgear com ...

Page 32: ...å å å å 3RZHU 0DQDJHPHQW 215 Anderson Avenue Markham Ontario Canada L6E 1B3 Tel 905 294 6222 Fax 905 201 2098 www ge com indsys pm Courtesy of NationalSwitchgear com ...

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