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GE AK-2A-15 User Maintenance Manual

Power circuit breaker
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  • Page 2: Table Of Contents

    C O N T E N TS INTRODUCTION. • • • • OPERATION • • • • • • • • • Electrical Operation Manual Operation · • • • • • • · · • • • • • •...

  • Page 3: Operation 3

    P0\1\/ER CIRCUIT BREAKERS AK·2·1S AK·2/3·25 Types I NTROOUCT ION the receiving, handling, storage and installation The instructions contained herein provide in­ of these breakers, refer to GEK-7302 furnished formation for performing maintenance procedures with all AK breakers. and for replacing AK-2/3-15 nents and accessories.

  • Page 4: Electrical With Manual Operation

    GEI-50299 Power Circuit Breakers Types AK-2-15 and AK-2/3-25 against trip paddle of trip shaft, • solenoid connecting link and manual cam connecting rotating it, and causing the mechanism trip latch link are both connected to the closing spring pin displaced. This allows the mechanism the top of...

  • Page 5: Maintenance 5

    MAINTENANCE INSPECTION front frame and mechanism of the breaker from the back frame or base, which consists of the B E F ORE INSPECTION OR ANY MAINTE­ current carr ying parts of the breaker and their supporting struc ture. The p rocedure for this NANCE W ORK IS D ONE, BE SURE T HAT T HE operation is as follows : BREAKER IS IN T HE OPEN P OSITION.

  • Page 6: Disconnects

    AK-2-15 and AK-2/3-25 GEI-50299 Power Circuit Breakers Types TROUBLES HOOTING ALL E XCESS LUBRICANT S HOULD BE REMOVED WITH A CLEAN CLOT H ORDER TO A V OID The following table l ists several typ ical s ymp­ ANY ACCUMULATION OF DIRT OR DUST. toms of breaker malfunct ion, together with the ir causes and remedies.
  • Page 7 Power Circuit Breakers Types AK-2-15 and AK-2/3-25 GEI-50299 BASIC B REAK ER COMPONENTS DISCONNECTS The movable part of the secondary disconnect consists of an insulating body which holds a con­ ducting spring loaded plunger to which a flexible PRIMARY DISCONNECTS lead is attached.
  • Page 8 surfaces mates with the concave pivot surface on When all wires have been connected, refasten • 1 1. the rear side of the stationary contacts. Each the body of the assembly to the breaker back the stationary contacts pivot in a horizontal plane frame.
  • Page 9 • GENERAL PREPARATION shaped section which is easily accessible to a small, open end, 1/4 inch wrench. Two cantilever Remove arc quencher retainer (1 ) Fig\lre 5 springs, which bear on each end against a portion bY. loosening the two captured nuts with a of the hexagon section of the pin, lock the ad­...
  • Page 10 GEI-50299 Power Cir cuit Bre akers T ypes AK-2-15 and A K-2/3-25 • REP LACE MENT OF MOVAB LE C ONTACTS stationary contacts and be sure to locate them ( 1 8 ) Figure 3. in the breaker with the upper and lower contacts having their stop projecting surfaces as shown Coat the pivot area only of the new movable in the section...

  • Page 11: Mechanism

    Power Cir cuit Bre akers Types AK-2-15 and AK-2/3-25 GEI-50299 (15) on the center pole into position. ment pin sure the stationary insulation barriers are correctly located. A lign the cross bar with the left and right pole pivot supports and install the left and right pole movable contacts.
  • Page 12 • listed i s that of proper mechanism latch engage­ CONTACT SPRINGS ment, the amount of engagement be . t ween the latch Figure 3 ( 1 9) and latch roller (5), Figure 6. This is the only A minimum force of 5 lbs and a maximum adjustment that is require d on the breaker mech­...
  • Page 13 where the latch and latch roller begin to engage. the breaker will not close. Use the maintenance In some cases, it may be necessary to turn closing handle whenever closing or attempting the adjusting screw less than 1 /4 turn to to close the breaker during this entire opera­...
  • Page 14 GEI-50299 Power Circuit Breakers Types AK-2 -15 and AK-2/3-25 • manually operated breakers, see procedure Should the mechanism continue to function improperly after the proper latch engagement described below.) has been set and the corrective measures listed Remove arc quenchers (See "Arc Quencher"). in the "Trouble Shooting"...

  • Page 15: Auxiliary Switch

    Power Circuit Breakers Types AK-2-15 and AK-2/3-25 GEI-50299 If the breaker is manually operated, and has AUXILIARY SWITCH no auxiliary switch, it is now free to be lifted If it has an auxiliary clear of the breaker. The auxiliary switch is mounted on the left switch, this may be disconnected from the side of the operating mechanism frame.

  • Page 16: Closing Solenoid

    • CLOSING SOLENOID need not be removed from the old bracket. This can be taken off the breaker simply by removing The closing solenoid consists of a magnet, the two screws which fasten it to the breaker frame. armature and coil. This assembly is located the breaker is a drawout type, the supporting bracket...

  • Page 17: Closing Switch

    Rotate the retaining spring clips to the locked After the old relay has been removed, the wire leads to the relay should be stripped of position, making sure that each clip is insulation to about 1/4 of an inch from the ends. proper recess, and replace the device cover.
  • Page 18 GEI-50299 Power Circuit Breakers Types AK-2 -15 and AK-2/3 -25 • CUT-OFF SWITCH Mount the replacement switch by reversing the order procedure. Figure 7. CLOSING SWITCH As explained under "Operation", the function of the cut-off switch is to de-energize the "X"...
  • Page 19 Power Circuit Breakers Types AK-2 -15 AK-2/3-25 GEI-5029 9 Figure 8. (805B 905) Closing Switch (Top View ) Insulation Movable Contact Speed Nut Stationary Contact Spring Screw Front Escutcheon Hinge Push Button Closing Solenoid TRIP AUX. SW. � T.C. Figure 9. ( 695C 1 61 ) Shunt Trip Device 1 1 .

  • Page 20: Overcurrent Trip Device

    Connect coil leads. • may be replaced without removing the device from the breaker by proceeding as follows : ADJUSTMENT Disconnect leads of coil (8). The only adjustment required on the shunt trip device is that which ensures positively that Remove two screws (6) which fasten magnet the breaker will trip when the device is activated.
  • Page 21 Figure 1 1. (8024843) EC-2 Overcurrent Trip With Cover Removed. Instantaneous Calibration Spring Movable Nut (Index Pointer) Time-Delay Calibration Spring Instantaneous Pickup Adjustment S crew Time-Delay Adjustment Screw Oil Dashpot Dashpot Arm Connecting Link Instantaneous Pickup Calibration Marks counter-clockwise motion decreases it. The dash­ pot arm (7), Figure 1 1 is indexed at four points, Figure 1 0.
  • Page 22 GEI-50299 Power Circuit Breakers Types AK-2 -15 AK-2/3-25 S e ries Coil Magnet Pallet Pinion Escape Wheel D riving Segment S. T .D. Armature S. T .D. Calibration Spring Trip Arm T rip Paddle 1 1. T rip Paddle Adjusting Screw L.T .D .

  • Page 23: Reverse Current Trip Devices

    Power Circuit Breakers Types AK-2 -15 AK-2/3-25 GEI-50299 E C- 1 OVERCURRENT TRIP DEVICE breaker mechanism or the overcurrent trip devices have been replaced. The EC-1 device can be provided with the Positive tripping is achieved when adjustment following tripping combination s crew (2), Figure 1 0, is in such a position that it will always carry the trip paddle on the trip Long time delay, short time delay and in-...
  • Page 25 POWER S E N S OR TR IP GENERAL DESCRIPTION The Ground Sensing Device works on the principle that the instantaneous value of current flowing in AK-3 Type Air Circuit B reakers contain the three conductors (or; in four conductors on Power Sensor Overcurrent Trip Devices.
  • Page 26 GEI-50299 Power Circuit Breakers Types AK-2 -15 AK-2/3-25 NOTE : No adjustment to the taps controlling the breaker to trip as a proper response to pick-up or timing should be made with the breaker these abnormal circuit conditions. carrying current. The possibility of the breaker being trip In the event the Power Sensor Device must free by mechanical interferences along the...
  • Page 27 Power Circuit Breakers Types AK-2 -15 and AK-2/3-25 GEI-50299 Check to be sure no continuity exists between between them. See drawing 138B2454 (Figure R and or between R and C . 2 2 ) with the breaker restored to service with the ground fault detector deactivated, establish Temporarily connect jumper from shield to whether there is false tripping due to over­...
  • Page 29 50 U R C E • OF .P oW.!iR T '!' P I C -"' L "'f-0\JtJD F A ' J LT Co•.i ,.;E:,TiON-:; 11i11 7 i',4L / ,-,tS7i'U.L.4T7�N ,:;E:N60;;e t#V'/ 7:>1<.5 CONNE 2 T S ENSO� ttlC.T !:R N Al.. O i S C O t4 ''-I E ::: i A NC Gi �OUN O C�ECI<.
  • Page 30 GEI-50299 Power Circuit Breakers Types AK-2 -15 and AK-2/3-25 1 1:0 110 i.ONI T I ME D E L. AY PI C K U P I ETTI N I A D .IUITAIL.E 80 - 1 00 - 120 - 140- 160 1 00 °...
  • Page 32 - - - - -, _ _ _ _ J C u s T e> ME R S T � ll N 5 FORMH< T (' t .: C o N N E c T tr. o Z. 3o v'. iO o � s E c . !:' { c •...
  • Page 33 R a - 2756A 2ow t 5 ,. . A· 25tJ 1/.0C REt.. A. 'I ltJ-v!' tttJ% R JI- o -25K C,,C4,C5., Ct.,C7 - �00 wvoc R9 - -'oo.n. .3 W "t 5 1' ., 1(10,1?, 1 - C2 - S!Ia-"f 35a WVIJC sa -"- ;:sw.
  • Page 34 GEI-50299 Power Circuit Breakers Types AK-2 -15 and AK-2/3-25 1 . Mounting Screw 2 . Frame 3 . Armature 4 . Spring 5 . Shading Ring 6 . Adjusting Screw 7. Locking Nut 8. Bushing 9. Clamp 1 0 . Magnet 1 1 .
  • Page 35 Power Circuit Breakers Types AK-2 -15 and AK-2/3-25 GEI -50299 • OPERATION alternate breaker presents a convenient method of mechanically interlocking two or more breakers Lever (2) is connected to the breaker mech­ to assure that no two breakers may be closed at anism so that when the breaker opens lever (2) the same time.
  • Page 36 Check that each armature holds the breaker OPEN FUSE LOCK OUT DEVI CE trip free when the armature position is limited (Figure 3 1 ) in reset by the lower latch surface on the indicator. The Open Fuse Lockout Device consists of two or three separately operated devices (one per With the breaker in the closed position, the phase).
  • Page 37 AK -2 - 1 5 and Power Circuit Breakers Types AK-2/3-25 GEI-50299 • M I S C E L L A N E O U S MAINTENANCE TOOLS C hanges in breaker requirements may oc­ casionally bring about the nec essity of adding or The following tools are recommended for changing breaker components or accessories in proper maintenance of AK-2 - 1 5 and AK- 2/3- 2 5...
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  • Page 40 For further information Distribution Equipment call or write your local Division 41 Woodford Avenue General Electric Plainville, CT 06062, USA Sales Off i ce or . . . GENERAL ELECTRIC GEI-50299E 1 2-81 PA-E...

This manual is also suitable for:

Ak-2-15Ak-2-25Ak-3-25Ak-2a-25Ak-3a-25Aku-2-25 ... Show all

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