GE AK-4-75 Maintenance Manual Download | Manualshive

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Courtesy of NationalSwitchgear.com

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Summary of Contents for AK-4-75

Page 1: ...AK 50 75 100 frame breakers provides maintenance instructions on the breaker models and trip devices tabu lated below Breaker Type Mounting Trip Device Type Frame Size Amp ECS SST Stationary Drawout AK 4 75 75C AK 4A 75 75C X 3000 AK 5A 75 75C AK 5 75 75C X AK 4A 100 X AK 4 100 4000 AK 5A 100 X AK 5 100 m m vU A I v V AK 5A 75 Rear View GENERAL W ELECTRIC Courtesy of NationalSwitchgear com ...

Page 2: ...eristics Flux Shift Trip Device Troubleshooting SST Test Set TAK TS1 False Tripping Ground Fault Replacement of Current Sensors Cabling Diagrams Ground Fault Defeat Cable 3 6 7 10 10 11 1 1 12 13 14 Type ECS Overcurrent Trip Device Components Trip Characteristics Cabling Diagram 14 15 15 16 ECS SST Time Current Curves 2 Courtesy of NationalSwitchgear com ...

Page 3: ...breakers and their other accessory devices are identical to those equipped with Power Sensor or EC trip devices Accordingly the general operational and maintenance information contained in publication GEK 7303 is equally relevant to ECS or SST equipped breakers and is not duplicated here In the event that a programner set knob is Note left untightened the trip function reverts to operation at its ...

Page 4: ...add to zero unless ground current exists On SST s equipped with Ground Fault the ground trip signal is developed by connecting each phase sensor in se ries with a companion primary winding on a ground differential transformer mounted in the programmer unit Its secondary output is zero as long as there is no ground current When used the neutral sensor fig 6 is separately mounted in the bus or cable...

Page 5: ...connector Tap terminal board Shorting strap Fig 5 Neutral sensor secondary disconnect block equipment mounted Fig 6 SST neutral sensor equipment mounted 5 Courtesy of NationalSwitchgear com ...

Page 6: ...tiple of X of L of L of X 1200 1600 2000 3000 AK 75 3000 Maximum 3 4 5 6 8 10 L or 1 75 2 2 25 2 5 3 4 L Maximum 0 35 Intermed 0 21 Minimum 0 095 20 22 25 30 35 4 X Maximum 0 30 Intermed 0 165 Minimum 0 065 22 6 7 8 9 1 0 1 1 X Intermed 4 5 6 8 10 12 L 10 4000 1600 2000 3000 4000 AK 100 Minimum 18 20 22 25 27 30 X 4 X Sensor ampere tap trip rating Pickup tolerance is 10 Time delay at lower limit o...

Page 7: ...rectly from the female AMP connector on the end of the breaker harness How ever AMP extraction tool Cat No 305183 is re quired for this method As long as the actuator remains in the reset posi tion the breaker can be closed and opened normally at will However when a closed breaker receives a trip signal from the programmer unit the actuator is energized and its solenoid flux opposes the magnet all...

Page 8: ...hift trip device reset linkage attachment 1 Actuator 2 Actuator arm 3 Trip rod 4 Trip rod adjuster end 5 Reset linkage 6 Actuator bracket 7 Mounting base Flux shift trip device with operating linkages 8 Courtesy of NationalSwitchgear com ...

Page 9: ...VIEW 1 Trip rod length Adjust gap to 0 093 0 015 using 0 093 diam rod as shown 2 Actuator bracket As the crossbar travels between the breaker closed and breaker open positions the tang of the actuator bracket must clear the buffer stud If in sufficient clearance exists loosen it s two mounting screws and rotate the bracket clockwise to take up mounting hole slack Retighten screws i 9 Courtesy of N...

Page 10: ...ished that the circuit breaker can be opened and closed normally from the test position attention can be directed to the trip de vice proper Testing is performed by either of two methods The TAK TS1 Test Set is a portable instrument designed for field checking the time current charac teristics and pickup calibration of the SST s various trip elements It can verify the ability of the Flux Shift Tri...

Page 11: ...S WILL OPEN CUR CUIT THE CURRENT SENSORS ALLOW ING DANGEROUS AND DAMAGING VOLTAGES TO DEVELOP Test scope 1 Verify the time current characteristics and pickup calibration of the various trip elements 2 Verify operation of the SST target indicators on programmer units so equipped B Complete Trip Device System For these tests the programmer unit must be mounted on the breaker and connected to its wir...

Page 12: ...ECTOR AMP 201297 1 LOAD Fig 13 Cabling Diagram SST without Ground Fault A B J C PROGRAMMER UNIT A A A BREAKER _ BACK FRAME T 1 1 oA oAr FLUX SHIFT TRIP DEVICE B RED 48V dc TO SCR ANODE O BLACK o I E LEFT POLE CURRENT SENSOR COM WHITE o A I 3 c BLACK TAP WHITE A o D 3 BLACK I WHITE B H 3 K BLACK c L 7 o T T Y HARNESS CONNECTOR AMP 201298 1 N o V LOAD PROGRAMMER CONNECTOR AMP 201297 1 with Ground Fa...

Page 13: ...g 15 Cabling Diagram SST with Ground Fault on 4 wire load BREAKER HARNESS CONNECTOR PROGRAMMER UNIT I GROUND FAULT DEFEAT CABLE CAT NO TGFD 1 r i i i OH i r B i o 7 7 CURRENT SENSORS V A t B t cF 4 I a 0 0 I I o l o I 4 oJ 3 I I I Any SST Programmer Unit with Ground Fault Element C c o j n D o 4 o 3 a F H O j 0 o 3 I K I r oh o 4 o j 4 o H 4 o 4 4 L _ T 4 r I 3 i N I NEUTRAL SENSOR DISCONNECT 1 M ...

Page 14: ...s the ECS trip device system operates and can be treated identically to SST This includes circuitry size construction component lo cation programmer unit set points performance characteristics operating range quality reliability and the flux shift trip device Use the same trouble shooting and test procedures for single phase high current low voltage tests or those employing the TAK TS1 Test Set Th...

Page 15: ...Set Points Sensor Ampere Rating Long Time Short Time Frame Size Amperes Breaker Type Instantaneous Pickup Pickup L Pickup Time Delay Band Seconds Time Delay Band Seconds X Multiple of X Multiple Multiple of L of L AK 75 3000 1200 1600 2000 3000 Maximum 3 4 5 6 8 10 L or 1 75 2 2 25 2 5 3 4 L Maximum 0 35 Intermed 0 21 Minimum 0 095 22 6 7 8 9 1 0 1 1 X Intermed 4 5 6 8 10 12 L 10 AK 100 Minimum 40...

Page 16: ... 0 7 0 9 1 MULTIPLES OF LONG TIME PICKUP L NOTE Short timo delay is optional Instantaneous can be omitted AK AKR LOW VOLTAGE POWER CIRCUIT BREAKERS GENERAL ELECTRIC GES 6032A ECS SOLID STATE OVERCURRENT TRIP DEVICE Programmer Set Points X Current Sensor Rating Amperes PICKUP long tint 6 7 8 9 1 0 I 1 I multiples d current sensor rating X Settings higher thon 100 d the from size do not increase the...

Page 17: ...S N Breaker v Typ 02 02 r 7 S s 7 AK AKR 50 1200 1600 14 000 18 000 s 7 7 7 s s s Ns s 7 AKT AKRT 50 1600 16 000 20 000 z 7 s 2000 7 7 7 s 5 J 7 1 1 1 3 4 S I 7 1 1 1 0 20 40 50 M 70 8010 g 1 1 1 1 1 1 1 1i i i i mill MULTIPLES OF LONG TIME PICKUP L AK AKR LOW VOLTAGE POWER CIRCUIT BREAKERS GENERAL ELECTRIC GES 6033B SST SOLID STATE OVERCURRENT TRIP DEVICE X Current Sensor Taps Amperes Programmer ...

Page 18: ...S 7 7 N Ui s 1 u 1 7 7 T z z Minimum Minimum 09 08 z 7 7 Z 08 07 08 7 7 7 7 Z 7 y 07 5 08 08 05 05 04 03 03 02 02 01 01 5 6 7 8 Li 2 2 8 B I 3 4 4 6 2 3 4 5 6 7 6 2 8 1 4 1 MULTIPLES OF CURRENT SENSOR TAP X NOTE 4H wire Ground Minor tap mutt be Ml win ot pha Minor lop TYPE AKR LOW VOLTAGE POWER CIRCUIT BREAKERS GENERAL ELECTRIC GES 6034A SST SOLID STATE OVERCURRENTTRIP DEVICE Programmer Set Points...

Page 19: ...d Fault D lay Bands S s s X Minimum X X u X s s s UJ xi 1 1 U y 5 w 09 z h i i 08 07 U X c X 07 I 08 08 09 05 04 04 03 03 02 02 01 i T L T 2 A 1 1 8 2 4 1 4 6 8 1 Li 2 8 8 1 4 2 MULTIPLES OF CURRENT SENSOR TAP X NOT 4th wir Ground n or tap must be et same at phase sensor tap AK AKR LOW VOLTAGE POWER CIRCUIT BREAKERS GENERAL ELECTRIC GES 6035B SST SOLID STATE OVERCURRENT TRIP DEVICE Programmer Set ...

Page 20: ...V DISTRIBUTION EQUIPMENT DIVISION PLAINVILLE CONNECTICUT GENERAL ELECTRIC Printed in U S A Courtesy of NationalSwitchgear com ...

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