GE IAC60T, Instructions Manual

Page 1: ...IN ST RU CT ION S GEK 65573 TIME OVERCURRENT RELAYS IAC6OT IAC8OT IAC9OT GENERAL ELECTRIC ...

Page 2: ...OUS OVERCURRENT UNIT 11 CAUTION 11 DRAWOUT RELAY TESTING 11 POWER REQUIREMENTS GENERAL 12 TIME OVERCURRENT UNIT 12 TIME SETTING 12 PICKUP TEST 13 TIME TEST 13 INSTANTANEOUS UNiT 13 PICKUP AND RESET 13 AUXILIARY UNIT 13 INSTALLATION 14 INSTALLATION TESTS 14 TIME OVERCURRENT UNIT 14 INSTANTANEOUS UNIT 14 AUXILIARY UNIT 14 PERIODIC CHECKS AND ROUTINE MAINTENANCE 15 TIME OVERCURRENT UNIT 15 INSTANTANE...

Page 3: ... distance relays operate the auxiliary unit which in turn completes the wound shading coil circuit Subsequent operation of the time overcurrent units provides the second zone time delay tripping This arrangement provides the means for obtaining close coordination between second zone tripping and overcurrent relays or fuses installed at tapped loads on the line At the same time the scheme provides ...

Page 4: ...inding which is connected in series with a resistor and capacitor on the extremely inverse units and the two coils on the lower legs of the magnetic circuit This floating circuit is connected to a contact of the auxiliary unit hA H In both types of time overcurrent units the disk and shaft assembly carry the moving contact which completes the trip circuit when it touches the stationary contact The...

Page 5: ...ble connection plugs Separate testing plugs can be inserted in place of the connection plugs to permit testing the relay in its case The cover is attached to the case from the front and includes an interlock arm which prevents the cover from being replaced until the connection plug has been inserted RATINGS TIME OVERCURRENT UNIT Ratings of the time overcurrent unit are given in Table I TABLE I PIC...

Page 6: ...rding to the formula I i where T is the time in seconds that the current flows T The continuous ratings for the various taps of each model and current range are given in Tables IV V and VI CONTINUOUS 0 5 4 0 AMP RANGE TABLE IV RATING OF 0 5 4 0 AMP TOC UNITS MODEL TAP 0 5 0 6 0 7 0 8 1 0 1 2 1 5 2 0 2 5 3 01 4 0 IAC6OT 1 6 1 8 2 0 2 1 2 3 2 7 3 0 3 5 4 0 4 5 5 0 IAC8OT 4 0 4 5 5 5 5 5 6 0 7 0 7 5 ...

Page 7: ...EL TAP 2 0 2 5 3 0 4 0 5 0 6 0 7 0 8 0 10 0 12 0 16 0 RATING IAC60 AMps 8 0 9 0 10 0 12 0 14 0 15 0 16 0 17 5 20 0 20 0 20 O INSTANTANEOUS OVERCURRENT UNIT These coils are suitable for dc and frequencies from 25 to 60 hertz The coils are rated for five amperes continuous and have a one second rating of 260 amperes The instantaneous unit has a range of 2 to 50 amperes Tap settings are made per Tabl...

Page 8: ...TIMES TIMES MINIMUM PICKUP RANGE HZ TAP R Z PICKUP PICKUP PICKUP 127 0 5 4 0 60 0 5 5 60 21 0 22 0 10 80 5 00 3 66 550 0 O 16 O 60 2 0 0 37 1 44 1 45 0 65 0 32 0 24 36 3 NOTE The impedance values given are those for the minimum tap of each relay The impedance for other taps at pickup current tap rating varies inversely approximately as the square of the tap rating For example for a relay with 0 5 ...

Page 9: ...CKUP 1 2 Z 0 5 4 0 60 0 5 0 80 1 38 1 60 1 60 1 60 1 60 40 1 5 12 0 60 1 5 0 085 0 147 0 17 0 17 0 17 0 17 4 25 The impedance values given are those for the minimum tap of each relay The impedance for other taps at pickup current tap rating varies inversely approximately as the square of the tap rating For example for a relay with 0 5 4 0 amp range the impedance of the 0 5 ohm tap is given as 1 60...

Page 10: ...T UNIT The instantaneous overcurrent unit is continuously adjustable over a 25 1 range Pickup is set by adjusting the vertical position of the armature relative to the markings on the calibration tube The instantaneous unit will reset to the de energized position between 85 and 95 percent of its pickup setting RECEIVING HANDLING AND STORAGE These relays when not included as part of a control panel...

Page 11: ...otated slowly clockwise The disk should return by itself to its rest position Make sure the control spring is not deformed nor its convolutions tangled or touching Instantaneous Overcurrent Unit The plunger assembly should exhibit no tendency to bind when operated by hand and the movable contact arms must be securely fastened to the molded contact support CAUTION EVERY CIRCUIT IN THE DRAWOUT CASE ...

Page 12: ...contacts just closing at No 0 time setting there should be sufficient gap between the stationary contact brush and its metal backing strip to ensure approximately 1 32 inch wipe The minimum current at which the contacts will just close is determined by the position of the tap screw in the tap block at the top of the relay When changing the current setting of the relay while in the case remove the ...

Page 13: ...iming should be within the limits in Table XII TABLE XII RELAY TIME IN SECONDS IAC6OT 1 73 1 83 IAC8OT 1 27 1 35 IAC9OT 0 89 0 95 INSTANTANEOUS UNIT Pickup and Reset The units are normally supplied from the factory with the bottom of the armature aligned with the top mark on the calibration tube This corresponds to the minimum pickup settinq on the nameplate It should be sufficient to check the pi...

Page 14: ...he tap value This multiple of tap value may be five times tap rating or the maximum fault current for which the relay must coordinate The value used is left to the discretion of the user Instantaneous Unit 1 Set the desired tap range 2 Set the pickup by turning the bottom of the knurled armature to the approximate position in the calibration tube corresponding to the desired pickup setting 3 Gradu...

Page 15: ...r the tap setting in service 2 Perform the time tests as described in the INSTALLATION section INSTANTANEOUS UNIT Check that the instantaneous unit picks up at the desired current level as outlined in the INSTALLATION section AUXILIARY UNIT Check that the auxiliary unit operates when voltage is applied as outlined in the INSTALLATION section CONTACT CLEANING For cleaning relay contacts a flexible ...

Page 16: ... the stop arm should be so formed that there is approximately 1 64 inch deflection The deflection can be increased if necessary by forcing a thin screwdriver blade between the leaf spring and the stop arm 2 Shaft End Play End play is determined by the relative positions of the lower jewel bearing and upper pivot Both bearing and pivot are held in position by means of set screws in the die cast sup...

Page 17: ...the unit may be brought into agrenent with the tap setting employed if for some reason this adjustment has been disturbed This adjustment also makes possible any desired setting between the various tap settings The unit is adjusted at the factory to close its contacts from any time dial position at a minimum current within five percent of the tap plug setting In making pickup checks use the connec...

Page 18: ... stock to enable the prompt replacement of any that are worn broken or damacjed When ordering renewal parts address the nearest Sales Office of the General Electric Company specify quantity required name of the part wanted and give complete model number of the relay for which the part is required 18 ...

Page 19: ...3 FiQ 6 Inverse 60 Hertz Time Curves 24 Fig 7 Very Inverse 60 Hertz Time Curves 25 Fig 8 Extremely Inverse 60 Hertz Time Curves 26 Fig 9 Instantaneous Unit Time Curves 27 Fig 10 External Connections 28 Fig 11 Auxiliary Unit 29 Fig 12 Cross Section of Drawout Case Connections 30 Fig 13 Test Connections Time Overcurrent Unit 31 Fig 14 Test Connections Instantaneous Unit 32 Fig 15 Outline and Panel D...

Page 20: ...GEK 65573 Fig 1 Later IAC6OT Relay Removed from Case Front View 20 ...

Page 21: ...GEK 65573 Fig Later IAC6OT Relay Removedfrom Case Rear View 21 ...

Page 22: ...GEK 65573 Fiq 3 Later Type IAC9OT Relay Removed from Case Rear View 22 ...

Page 23: ...UND SHADING COILS CONNECTIONS SHOWN RE FOR LOWER RATING FOR HIGHER RATING AIER HANGE THESE LEADS SHORT FINGER Fig 4 0275A4595 O Internal Connections for Relay Types IAC6OT and IAC8OT 17 Is II 13 15 i lOC 02 A 2 B ID 23 ...

Page 24: ...73 SHORT FINGER TOC WOUND SHADING COILS CO N NEC TI ON S SHOWN ARE FOR LOWER RATING FOP HIGHER RATING A INTERCHANGE THESE LEADS Fig 5 0275A4596 O Internal Connections for Relay Type IAC9OT 5 17 A R C4 TOC TOC 02 bC 8 I0 24 ...

Page 25: ... 6 m 0 Co Co 0 J 0 C 5 TC S r C Di S Di C CD S Li C Li 0 5 CD Di CD C a C 0 0 o o 0 00 0 Ni 0 0 i 0 0 0 0 i 0 0 0 000 0 O0Ni 00 0 0 0 0 Ni 0 a 0 0 C 4 0 Lfl 0 0 rn 1 0 a L7 C fl c i a 700 a 40 0 1 a cc 100 I00 000 loot 1I 8 3 88 V 00O 4000 0 00 0000 0000 0000 00 7 c 00 3 8 8 88888k uNO3 NI 31 IL ...

Page 26: ... I 2 I 1 to I O to cc C Lt o C C c to o to t_ t C L C LtJ cc 0 0 0 o c 0 to 0 0 o to 0 0 to to 0 C to tO 1 000 z Oto 0 toO 0 0 1 00 C I I I NI z sujsoIQeuIIj S EEE HEEE rE E EEEE EEEE EE EE E H H H c a ci 03 Q S C C z I III I I GNO3c NI U ...

Page 27: ... Characteristics for Relay Type IAC9OT III HI RAT I BOO TIME UNIT INST IJNIT 100 410 040 I04 00 IC 70 0 5 9 0 1 5 12 0 2 5 EXTE t CEID RM IC E 80C SERIES 0 Ll 0 2 16 I 0 661 20 60 TIME UNIT TAPS ADJ US ml F NT S INST UNIT CONT I NIJOUSLY ADJUSTABLE 100 z 0 C L 2 4 0 2 Lfl 0 2 10 C I I II 44 II 00 JO 1 I __ th r EEE EZEEEE I 7 0 4 1 I I I III 20 JO 40 00 IO7II0II g s 7 a 7 I III 20 JO 40 00 IO7IId4...

Page 28: ... iiI fltE 1 1 JUt JUL P I OPEN GAP I i I I 1 it ________ ID I j trr J W I I f tL UIt4I I 1 TjTBI1T 1i c j oI 5 CD 1 ID I 1 1 r i j I C I 4 E tfffft fl i44 tl Tt4I1 1 4t H rr utr BIN 1 L m II ii 15 2 3 4 56 78910 20 CI 30 40 50 ...

Page 29: ...j1 Il I I GEK 65573 Fig 10 014507101 0 Elementary Diagram for Two Zone Distance Protection II I1 29 ...

Page 30: ...GEK 65573 OPERATING ARM____ RESIDUAL SCREW LOCKNUT__ CONTACTS HEEL END Fig 11 O3O546 Typical Telephone Relay Unit Used in the IAC6OT TAC8OT and IAC9OT Relays COIL 30 ...

Page 31: ...0 F 0 m C 4 CONNECTING PLUG MAIN BRUSH CONNECTING BLOCK AUXILIARY BRUSH TERMINAL BLOCK SHORTING BAR NOTE AFTER ENGAGING AUXILIARY BRUSH CONNECTING PLUG TRAVELS 1 4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL BLOCK ...

Page 32: ...CE OP LOAP BOX 115 VOLTS 60 CYCLES 0 i I 125 250V D C SW TCH DOTTED CONNECTIONS APE FOR PHASE 2 UN T TEST Fig 13 0165A6029 O Test Connections for the Time Overcurrent Unit of the IAC6OT IC8OT and LLC9OT Rel ays L 7 8 j TOC 32 ...

Page 33: ...D BOX 0 11 L FIG 14 115 VOLTS 60 CT CLE Fig 14 0165A6028 O Test Connections for the Instantaneous Overcurrent Units of the IAC6OT IAC8OT and IAC9OT Relays 131 15 14 16 VARIABLE RESI STANCE OR GAB BOX TEST PLUG UPEP 0 19 20 0 21 L _I J 33 ...

Page 34: ...MBERING OF STUDS BACK VIEW I9 171513 II 00000 00000 20 IS IG 14 12 7 531 00000 00000 5 6 4 2 MM 7 5 502MM 19 75 VIEW SHOWING ASMBLY OF HARDWARE FOR SURFACE MTG ON STEEL PANELS 44MM 1 75 p9MM DRILL H0LE5 0TH ENDS DRILL MM GI 4OLES I2ML4j MM SOOTYPICL PANEL DRILLING FOR SEMI FLUSH PANEL DRILLING FOR S4JR MOUNTING FRONT VIEW RACE MOUNT4NG FRONT ViEW 34 ...

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Page 36: ...GE Power Management 215 Anderson Avenue Markham Ontario Canada L6E 1B3 Tel 905 294 6222 Fax 905 201 2098 www ge comlindsyslpm ...