GE IAC77A, Instructions Manual

Page 1: ...GEK 34055F INSTRUCTIONS TIME OVERCURRENT RELAYS TYPES IAC77A FORM 800 AND UP IAC77B FORM 800 AND UP IAC78A FORM 800 AND UP IAC78B FORM 800 AND UP GENERAL ELECTRIC Courtesy of NationalSwitchgear com...

Page 2: ...E TEST INSTANTANEOUS UNIT SETTING THE INSTANTANEOUS UNIT PICK UP TESTS TARGET AND SEAL IN UNIT PICK UP AND DROPOUT TEST 8 9 9 10 10 10 11 11 11 11 12 12 12 12 13 13 13 14 INSTALLATION TIME OVERCURRENT...

Page 3: ...ndard SI case is used to mount each relay mounting dimensions of this case are shown in Figures 11 and 12 The outline and The basic differences between the relays covered by these instructions are not...

Page 4: ...o coordinate with downstream relays a coordination time of from 0 25 to 40 second is generally allowed These coordination times include in addition to breaker clearing time 0 10 second for relay overt...

Page 5: ...ntacts of the time overcurrent unit and its coil is connected in series with the time overcurrent unit instantaneous unit picks up it raises a target which latches up and remains exposed until it is r...

Page 6: ...2 5 3 0 4 0 RATING 3 5 3 7 4 0 4 5 5 0 5 5 6 0 7 0 8 0 9 0 10 0 1 5 12 0 AMPRANGE TAP 1 5 2 0 2 5 3 0 4 0 5 0 6 0 7 0 8 0 10 0 12 0 RATING 9 5 10 5 11 5 12 5 14 0 15 5 17 0 18 0 19 0 20 0 20 0 2 0 15...

Page 7: ...0 2 500 2 0 16 0 2 0 130 0 260 0 16 900 67 600 8 0 S 16 0 P 3 0 4 0 6 0 10 0 80 0 10 0 40 0 S 20 0 80 0 P 15 0 160 000 360 000 400 0 600 0 25 0 20 0 160 0 20 0 80 0 S 40 0 160 0 P 25 0 600 0 600 0 360...

Page 8: ...P BURDENS IN OHMS Z V A AT 5 AMPS 3 10 20 0 CALCULATED FROM IMPEDANCE AT MIN PICKUP l2z RANGE HZ MIN R Jx Z TAP TIMES TIMES TIMES PICK PICK PICK UP UP UP 0 5 0 4 60 0 5 0 80 1 38 1 60 1 60 1 60 1 60 4...

Page 9: ...relays is defined as the current required to close the contacts from the 0 5 time dial position The pickup value of the IAC77 relays is within 3 of the tap value The setting of the time dial determin...

Page 10: ...ation or as acceptance tests at the discretion of the user operating companies use different procedures for acceptance and for installation tests the following section includes all applicable tests th...

Page 11: ...hough this requires C T since connections circuitry POWER REQUIREMENTS GENERAL All devices operating on alternating current AC are affected by frequency fundamental frequency plus harmonics of that fu...

Page 12: ...ickup Test Set the relay at the 0 5 time dial position and 2 0 amp tap Using the test connections of Figure 13 the main unit should close its contacts within 2 of tap value current 1 96 2 04 amp other...

Page 13: ...ationary setting and place it in the desired tap first The tap screw is the contact screw To change the tap first remove one screw from the left hand stationary contact Next remove the screw from the...

Page 14: ...AP The operating time should be the time 5 TARGET AND SEAL IN UNIT 1 Make sure that the tap screw is in the desired tap Perform pickup and dropout tests as outlined in the ACCEPTANCE TESTS section 2 I...

Page 15: ...erform the Time Test as described in the ACCEPTANCE TESTS section 2 INSTANTANEOUS UNIT Check that the Instantaneous Unit picks up at the desired current level as outlined in the ACCEPTANCE TESTS secti...

Page 16: ...securely in its 2 See test Set the tap plug in the 2 amp tap and the time dial where the contacts are just open Set the resistor at the midpoint of its range and check the current required to just cl...

Page 17: ...mp tap and the time dial at No 5 time setting apply five times 5X tap current to the relay Adjust the drag magnet to obtain a closing time as near as possible to 0 92 second but at least between 0 87...

Page 18: ...2 3 TARGET AND SEAL IN UNIT Check steps 1 and 2 as described under INSTANTANEOUS UNIT above To check the wipe of the seal in unit insert a 0 012 inch feeler gage between the plastic resid al of the a...

Page 19: ...rve of the Instantaneous Unit 27 8 Time Current Characteristics of 50 Hz Types IAC77 and IAC78 800 Series Relays 9 28 Time Current Characteristics of 60 Hz Types IAC77 and IAC78 800 Series Relays 10 2...

Page 20: ...TERMINAL BLOCK SHORTING BAR NOTE AFTER ENGAGING AUXILIARY BRUSH CONNECTING PLUG TRAVELS 4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL BLOCK Figure 1 8025039 Cross Section of Drawout Case Show...

Page 21: ...US 4 UNIT V HA SEAL IN TARGET TAP SELECTOR SCREW MAIN MOVING SHAFT T 1 M F CONTROL SPRING ADJUSTING RING MAIN STATIONARY BRUSH AND CONTACT ASSEMBLY DRAG MAGNET DISK GENERAL ELECTRIC TWt OVWH ftfiAY T...

Page 22: ...GEK 34055 CRADLE VARIABLE RESISTOR CAPACITOR INSTANTANEOUS UNIT RANGE SELECTOR LEADS Figure 3 8041297 Type IAC77 800 Series Relay Removed from Case Rear View 22 Courtesy of NationalSwitchgear com...

Page 23: ...GEK 34055 ZZT SI IND r T SI T SI V V y V V 1 5 o 2 6 SHORT FINGERS Figure 4 0165A7758 Type IAC77A 800 Series Relay Internal Connections Front View 23 Courtesy of NationalSwitchgear com...

Page 24: ..._ 7 Y V 1 NOTE INST UNIT CONNS SHOWN ARE FOR LOW RANGE OPERATION FOR HIGH RANGE OPERATION CONNECT B D TO O TERMINAL 5 A C 6 TO TERMINAL 7 O o o J o L D O 2 V SHORT FINGER TSI TARGET SEAL IN INST INST...

Page 25: ...GEK 34055 INDUCTION UNIT T S I M V V V V V v V l 3 5 O 2 6 SHORT FINGER Figure 6 0165A7781 Type IAC78A 800 Series Relay Internal Connections Front View 25 Courtesy of NationalSwitchgear com...

Page 26: ...I y V V V V V V V V V V V V V 7 O 5 9 3 O 10 2 6 SHORT FINGER T SI TARGET SEAL IN NOTE INSTANTANEOUS UNIT CONNECTIONS SHOWN ARE FOR LOW RANGE OPERATION FOR HIGH RANGE OPERATION CONNECT B D TO TERMINAL...

Page 27: ...o CNJ o 00 r CL o v U CO Q _ U_ o 5 oO UJ I m o o 4JU 1 5 ffi O 3 f t 00 CvJ m T i 6 o m tn o 8 o o o SQN003S Nl 3WI1 dfDOId Figure 8 0208A8695 1 Time Current Curve of the Instantaneous Unit 27 Court...

Page 28: ...GEK 34055 Types IAC77 28 Courtesy of NationalSwitchgear com...

Page 29: ...OUSLY ADJUSTABLE 200 200 100 1 00 M 10 BO 70 70 eo to 90 50 40 40 30 30 20 29 10 10 is e 32 7 7 V xw tn s 9 d a A V Z 2 X O 4 u Id l 1 t n 4 I 3 W 3 n n o P 2 L k 1 t 3 v i G 8 f w a X 7 T 7 r v YAv C...

Page 30: ...1 156 29MM 2 187 56MM r t 3 0 I t r CUTtlUT 76MM f i 4 375 1 1 1 MM 1 8 812 223MM I 3 9061 99MM 4 t JlGpOo O 4 281 1 08MM i I 1 468 37MM i l f 718 18MM 2 5C 2 843 72MM 6MM L 218 5MM PANEL 218 500 5 25...

Page 31: ...RILL B 2 HOLES 4 HOLES 4DRUL 75 HOLES NM K e 3 9 5 t PANEL afS t UJO I oer CM P j l8 STUD tr siisB L 1 o r PAftL DRLING FOR SEMCFLUSH MOUNTING FRONT V W lb 2 0 3 PANEL DRILLING FOR SURFACE MOUNTING FR...

Page 32: ...6 0 6 1 2 3 4 O O O O O O 7 8 9 10 XLA13 TEST PLUG A VARIABLE RESISTOR 1 TO TIMER START TO ACCURATELY REPRODUCE RELAY CHARACTERISTICS ALL TESTS SHOULD BE MADE WITH RELAY IN CASE 1 MIN RECOMMENDED VOL...

Page 33: ...2 51 1 51 N 51 3 1 T 5 5 5 52 A 51 3 r 51 2 51 1 r 6 6 52 TC 51 N Figure 14 0246A6966 1 External Connections of Four IAC77A Relays Used for Multi Phase and Phase to Ground Fault Protection of a 3 Phas...

Page 34: ...1 51N 51 2 SI SI 51 3 5J 3 SI 2 3 52B 52A A A 52A 52B TC TC Figure 15 0246A6967 External Connections of Four IAC78A Relays Protecting a 3 Phase Circuit Against Multi Phase and Phase to Ground Faults...

Page 35: ...Courtesy of NationalSwitchgear com...

Page 36: ...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...