GE GEK-7345, Instructions And Recommended Parts For Maintenance

Page 1: ... 750 5 1200 2000 AMPERE W ML 13 MECHANISM I INTRODUCTION 3 I RECEIVING HANDLING AND STORAGE 1 3 INSTALLATION A DESCRIPTION OF OPERATION 4 1 ADJUSTMENTS 10 I GENERAL MAINTENANCE 15 it SI W 28 RENEWAL PARTS I 1 1 s II I I SWITCHGEAR PRODUCTS DEPARTMENT ELECTRIC GENERAL I PHILADELPHIA PA ZJZIZ Courtesy of NationalSwitchgear com ...

Page 2: ...Trnr Tr 1 I I i i i Courtesy of NationalSwitchgear com ...

Page 3: ...bination has a very corrosive effect on many parts 3 Unfinished surfaces of rollers latches etc of the operating mechanism should be coated with grease to prevent rusting If the breaker is stored for any length of time it should be inspected periodically to see that rusting has not started and to insure good mechan ical condition Should the breaker be stored under unfavorable atmospheric condition...

Page 4: ...er and operate it electrically sev eral times Check the control voltage as described under CONTROL POWER CHECK Page 14 Disconnect the test coupler and replace box barrier If the breaker has been stored for a long period of time it is recommended that the insulation be checked with a standard 60 hertz high potential test Refer to Insulation Test Page17 I 3 4 5 NOTE If the breaker secondary wiring i...

Page 5: ...Left Side View ML 13 Operating Mechanism 2 3 i Secondary Coupler Interlock Switches Auxiliary Switch Latch Checking Switch Switch Cam Closing Roller Power Switches Closing Latch Closing Springs Motor 2 4 3 4 5 5 6 6 7 8 9 10 Figure 3 8038805 Spring Discharge Linkage 1 Link Adjusting Bolt Trip Latch Crank Discharge Crank Adjusting Clevis Spring Release Crank 2 3 4 5 6 5 V TWiTV Courtesy of National...

Page 6: ...enoid operated breakers in M 36 metal clad units fuses are mounted on the breaker for protection of the motor and closing circuit These breakers are identified by either a C F or J suffix in the breaker nomenclature In cases where breakers with type ML 13 mechanisms must match and line up with breakers having type ML 11 mechanisms the spring charging circuit for both mechanisms should be fused wit...

Page 7: ... the ratchet wheel continues to rotate the spring load will shift over center and attempt to discharge After a few degrees of rotation the closing roller 6 Figure 2 will engage the closing latch 8 and the compressed springs will be held by the latch until a closing operation is required During the last few degrees The closing springs may be charged manually if control voltage is lost A 5 8 ratchet...

Page 8: ...ler permitting the operating mechanismlinkage to collapse The energy stored in the opening springs is released to provide the required opening speed for successful interruption of the circuit As the breaker opens tointerrupt a current the arc first starts at the arcing contacts 5 21 Figure 8 transfers to the arc runner 3 8 and energizes the blow out coils 2 7 This action introduces a magnetic fiel...

Page 9: ...e willforce the trip latch 17 Figure 7 away from the trip roller 19 causing the mechanism linkage to collapse and the breaker to re open The closing cam 8 will complete its closing stroke and the springs will re charge as in a normal closing operation 2 10 II 12 13 2 O 14 3 15 1 i 16 4 17 5 18 6 19 7 20 8 21 22 9 23 24 1 I 1 y Figure 8 0152C5904 Cross Section of Breaker Pole Unit 17 Stationary Pri...

Page 10: ...REVENT ACCIDENTAL CLOSING OR TRIPPING Refer to Figure 9 when the breaker is closed the stationary primary contacts 1 should rise from 1 4 to 5 l6 Before checking this dimen sion be sure the mechanism is re set so that the prop pin 4 Figure 7 is resting on the prop To obtain the proper contact adjustment open the breaker and referring to Figure 10 loosen the check nut 4 and turn the adjusting nut 3...

Page 11: ...behind the trip arm screw must first be loosened Retighten locking screw after making adjustment Closing Latch Wipe WHEN WORKING ON THE MECHANISM IN THE CLOSED POSITION KEEP FINGERS CLEAR OF THE LINKAGE AS ACCIDENTAL TRIPPING CAN CAUSE SEVERE INJURY Refer to Figure 6 The wipe between the closing latch 8 and roller 6 should be 3 16 to 1 4 If re setting is required loosen set and retighten adjustmen...

Page 12: ...ent is required for either pawl the springs must first be fully charged and blocked Loosen seven motor support bolts 1 Figure 15 and move entire motor assembly to the rear if the clearance is under the minimum at the latching pawls and to the front if the clearance is under the minimum at the driving pawl Move the motor assembly approximately twice the dimensional increase required at the pawl Be ...

Page 13: ... are used in metal clad units designed for solenoid operated breakers Inspection and Test 1 For ease in reviewing the adjustments the following are recapitulated a Primary contact wipe 1 4 to 5 16 b Arcing contact wipe 5 16 or greater gap at primary contacts c d e f g Motor and relay switch clearance 1 32 Interlock switch maximum clearance 1 32 Driving and Latching Pawl minimum clearance to ratche...

Page 14: ...he mechanism adjustments are checked as described the operating voltages should be checked at the closing coil trip coil and motor terminals Control Power for electrical operation of the breaker may be from either an alternating or direct current source The operating ranges for the closing and tripping voltages asgivenonthe breaker nameplate are as follows Nominal Voltage Closing Range Tripping Ra...

Page 15: ...r to Figure 16 An arc chute lifter is normally furnished with the metal clad switchgear for use in removing and replacing the interrupters of the AM 13 8 750 breakers When the lifter is not available an overhead crane or portable hoist may be used The arc chute lifter is assembled to the top plate of the breaker as shown in the reference figure Before assembling the lifter on the breaker it is nec...

Page 16: ... to lift the interrupter To remove the interrupter loosen the two upper supporting bolts 9 and the one lower support bolt 11 using a standard 3 4 wrench Raise the assembly approximately 3 8 and continue to raise the interrupter and gently move it from side to side until both upper and lower supports are disconnected arc chute lifter towards the rear of the breaker and lower the interrupter to a re...

Page 17: ...lation Mechanism A careful inspection should be made to check for loose nuts bolts and loose or damaged set screws or other locking devices All cam roller and latch surfaces should be inspected for any evidence of damage or excessive wear Lubricate the mechanism as Outlined below then using the manual charging wrench open and close the breaker several times to make certain that the mechanism opera...

Page 18: ...ideration the frequency of operation of the breaker and local conditions It is recommended that lubrication of the breaker and its operating mechanism be a part of the periodic inspection and maintenance program with not more than a two year period between lubrications It is also recommended that all circuit breakers be operated at regular intervals at least once a year to insure the lubrication i...

Page 19: ...tom of the sta tionary contact support should be in spected for possible need of replace ment 2 Wipe all insulating parts clean of smoke deposit and dust with a clean dry cloth including the bushings and the inside of the box barriers 3 All flat parts in the throat area of the interrupters should be thoroughly cleaned by using sandpaper This cleaning should be performed any time the interrupter is...

Page 20: ...by arcproducts The blow out coils should be carefully examined and if the insulation has been cracked shrunk or eroded from arc action and heat so that the turns of the coils are not fully insulated from each other the coils should be re placed All connections should be checked for tightness The arc runners should be inspected and replaced when the arc resistant coating on the runner surface has b...

Page 21: ...as described for every 2 000 operations and properly adjusted before being put back into service 4 Remove the assembly bolts 2 6 9 11 15 17 and 19 Figure 18 Remove the side brace 7 and upper brace 3 the upper pole pieces 5 the lower pole pieces 8 and the rear muffler assembly 4 To remove the upper supports 12 and upper interrupter support 14 remove the assembly bolts 1 and 13 and the bolted connec...

Page 22: ...fins at the rear of the arc chute sides measured at least 1 in from the back end of the arc chute See Figure 21 should be 1 16 maximum 3 Check to insure that electrical connections to the blow out coils are tight0 4 When reassembling the arc runner as semblies check that the spacers 6 13 Figure 19 are correctly installed 5 Before bolting the upper supports in place make certain that the upper arc ...

Page 23: ...raidsfrom studplate remove one bolt 5 4 To disassemble stud plate from con tact support remove two bolts 6 5 Reassemble in the reverse order make sure locking plates areproperly reassembled with bolts 8 1 2 3 1 H li vtWvv J i ii mm H m k m s 2 ft 3 mi m mm m 5 m H i ii smi 6 P m 7 S A m 8 m m 9 m a mm fill 10 m R 11 iBSil lw vJS m 12 ffl mm it i 13 v 14 lili fti 11 Mi 1 15 v I mm iv y GL Figure 23...

Page 24: ...spring and spring compressor Figure 24A 1 noting 3 Turn nut 2 in clockwise direction to compress contact spring Figure 24B on spring compressor to prevent spring from slipping out of the compressor 4 Place washer not shown on guide on top of spring place top of guide into hole in spring retainer 4 and the round end of spring guide in cutout in primary finger Figure 24C 5 Hold spring assembly firml...

Page 25: ...34468 Figure 24C 8034469 i Figure 24 Method of Installing Primary Contact Springs Using a Spring Compressor 1 Spring Guide Compressor Nut Spring Compressor Spring Retainer Assembly Bolts 6 Spring 70 Contact Support 8 Stop Plate 90 Stationary Primary Finger 2 3 4 5 25 j a Courtesy of NationalSwitchgear com ...

Page 26: ...isassemble the contact support 2 and interrupter mount ing bracket 3 removing two bolts 4 7 Reassemble in the reverse order The interrupter mounting bracket 3 is not symmetrical and must be assembled cor rectly to orient the interrupter properly on the breaker The longest projection of the bracket should be toward the lower end of the bushing i 1 2 3 4 Remove the two mounting screws of the upper s...

Page 27: ... centered I 1 Remove two cotter pins at ends of trip latch roller shaft 8 Figure 13 2 Partially remove shaft out right side of frame until latch roller 6 is free 3 Reassemble in reverse order with proper spacing of washers Be sure latch roller rotates freely CLOSING LATCH 3 4 5 6 1 Remove cotter pins at both ends of closing latch shaft 9 Figure 6 2 Remove spring and paddle 12 3 Remove set screws f...

Page 28: ...ge the springs with the manual charging wrench and apply the spring blocking device as described in INSTAL LATION 4 2 Discharge springs by pushing manual close RENEWAL PARTS ORDERING INSTRUCTIONS It is recommended that sufficient renewalparts be carried in stock to enable the prompt replace ment of any worn broken or damaged parts A stock of such parts minimize service interruptions caused by brea...

Page 29: ...48 V DC 006174582G001 006174582G015 006174582G002 006174582G013 006174582G032 006275070G001 006275070G002 6 15 1 Closing Coil 110 125 V DC 220 V DC 250 V DC 115 V AC 60 Hz 230 V AC 60 Hz 48 V DC 006174582G001 006174582G015 006174582G002 006174582G010 006174582G014 006275070G002 0456A0866P005 0456A0866P006 0137A9192G011 0161A4231P001 0137A9252P001 0161A4241P001 0161A5909P001 006071231P001 7 Switch ...

Page 30: ...ector Right Long Flexible Connector Left Short Flexible Connector Right Short Throat Barrier Assembly Arcing Contact Assembly Primary Contact Finger Spring Primary Contact Finger Spring Primary Contact Finger Primary Contact Finger Movable Primary Contact Movable Primary Contact Movable Primary Contact Movable Arcing Contact Tube Piston Assembly Throat Cooler Assembly Right Throat Cooler Assembly ...

Page 31: ... AUX SW M MOTOR 52 TC RE T z 52 X 52Y REQUIRED FOR 220 ft 250V dc OPERATION ONLY A CONTACTS FURNISHED AS REQUIRED r i A 1 1 U 5 2 N SM LS N Y Y 1 1 1 1 0108B5599 OR Y DESCRIPTION REF NO FIG NO 52 AUXILIARY SWITCH 1 5 AUX SW CLOSING COIL 6 15 52X CONTROL RELAY 17 6 52Y 52 TRIP COIL 3 5 TC 52 INTERLOCK SWITCHES 2 2 T3 52 CLOSING LATCH MONITORING SWITCH 13 6 C L MS 52 S M LS POWER SWITCHES 7 6 LATCH ...

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