GE Po werVac VL · 2020. 10. 12. · g GEH-6468A Instructions GE Po werVac ® VL Vacuum Circuit...

gg GEH-6468A InstructionsGE PowerVac® VLVacuum Circuit Breaker

TYPE

PV-VL 13.8-500-0 and -1PV-VL 13.8-750-0 and -1PV-VL 13.8-1000-0 and -1With ML-18VL Mechanism

www.nationalswitchgear.comCourtesy of NationalSwitchgear.com

GEH 6468A - Power/Vac VL Breaker


GEH 6468A - Power/Vac VL Breaker Page 3

CONTENTS

1. INTRODUCTION 5 11.3 CONTACT GAP 30 1.1 SAFETY 5 11.4 CLOSE COIL PLUNGER GAP 31

11.5 TRIP COIL PLUNGER GAP 312. DESCRIPTION 5 11.6 CONTROL SWITCH ADJUSTMENT 31

3. RECEIVING, HANDLING AND STORAGE 6 12. ELECTRICAL CHECKS 31 3.1 RECEIVING 6 12.1 ELECTRICAL OPERATION 31 3.2 HANDLING 6 12.2 HIGH-POTENTIAL TEST 31 3.3 STORAGE 6 12.2.1 PRIMARY CIRCUIT 31 3.4 PACKING LIST 6 12.2.2 SECONDARY CIRCUIT 32

12.3 PRIMARY CIRCUIT RESISTANCE 324. INITIAL INSTALLATION PROCEDURES 7 12.4 VACUUM INTEGRITY TEST 32 4.1 DOOR WIRING INTERFERENCE 7 12.5 INSULATION TESTS 33 4.2 POSITIVE INTERLOCK TEST PROCEDURES 7 13. CHECKING AND INSTALLATION 33 4.3 BY-PASS KIT INSTALLATION 7 4.4 CHECKING FOR PROPER INTER- 14. MAINTENANCE 33 LOCK AND TRIP FREE FUNCTIONS 14.1 GENERAL 33 BEFORE LOWERING THE BREAKER 14.2 SERVICE CONDITIONS 34 FROM THE ELEVATED POSITION 8 14.3 FAULT INTERRUPTION 34

14.4 CONTACT EROSION 345. ADJUSTMENTS TO BREAKERS / 14.5 TRANSFER FINGER WEAR 35 SWITCHGEAR INTERFACES 8 14.6 MECHANISM 35 5.1 STATIONARY AUXILIARY SWITCH 8 14.7 PRIMARY INSULATION PARTS 35 5.2 PRIMARY CONTACT PENETRATION 9 14.8 LUBRICATION 35 5.3 POSITIVE INTERLOCK 9 14.9 RECOMMENDED MAINTENANCE 35 5.4 SECONDARY COUPLER 10 5.5 SPRING DISCHARGE CAM 10 15. TIMING 36 5.6 STOPS 10 5.7 GROUND 10 16. OPENING AND CLOSING SPEED 36 5.8 POSITION SWITCH 10

17. REPAIR AND REPLACEMENT 366. TYPICAL WIRING DIAGRAMS 11 17.1 GENERAL 36

17.2 REPLACING INTERRUPTERS 367. FEATURES 27 17.3 PRIMARY DISCONNECTS 37 7.1 SAFETY PRECAUTIONS 27 17.4 MECHANISM 37 7.2 INTERLOCKS 27 17.5 CONTROL SWITCHES 37 7.2.1 RATING INTERFERENCE PLATE 27 17.6 TRIP COIL REPLACEMENT 37 7.2.2 POSITIVE INTERLOCK SYSTEM 27 17.7 CLOSING COIL REPLACEMENT 37 7.2.3 SPRING DISCHARGE SYSTEM 27 17.8 AUXILIARY SWITCH

REPLACEMENT37

17.9 MOTOR REPLACEMENT 388. OPERATION 28 17.10 “Y” RELAY REPLACEMENT 38 8.1 CLOSE SPRING CHARGING 28 8.2 CLOSING OPERATION 29 18. RENEWAL PARTS 38 8.3 OPENING OPERATION 29 18.1 ORDERING INSTRUCTIONS 38 8.4 TRIP-FREE OPERATION 29

19. MECHANICAL ADJUSTMENTS 389. CONTROL CIRCUIT 29 19.1 GENERAL 38

19.2 WIPE ADJUSTMENT 3810. MECHANICAL CHECK AND 19.3 CONTACT GAP ADJUSTMENT 39 SLOW CLOSE 29 19.4 TRIP COIL PLUNGER 39 10.1 VISUAL INSPECTION 29 19.5 CLOSE COIL PLUNGER 39 10.2 CLOSING SPRING CHARGING 29 19.6 CLOSE SPRING INTERLOCK 39 10.3 CLOSING SPRING GAG 30 19.7 POSITIVE INTERLOCK 39 10.4 SLOW CLOSING 30 10.5 GAG TOOL REMOVAL 30

11. DIMENSIONAL CHECKS 30 LIST OF ILLUSTRATIONS 4 11.1 PRIMARY CONTACT EROSION 30 INDEX 70 11.2 SPRING WIPE 30 STATIONARY CUBICLE INFORMATION 62



LIST OF ILLUSTRATIONS

FIGURE PAGE1 INTERIOR VIEW OF STATIONARY CUBICLE 122 INTERLOCK MODIFICATION 133 MOTOR OPERATOR SWITCH ACTUATOR 144 ELEVATING MOTOR TROUBLESHOOTING 155 SCHEMATIC DIAGRAM - VERTICAL LIFT DRIVE MECHANISM 166 STATIONARY STRUCTURE WIRING 177 BY-PASS KIT INSTALLATION 188 BREAKER WIRE DIAGRAM (typical) OLD MS MECHANISM 199 BREAKER WIRE DIAGRAM (typical) OLD ML MECHANISM 2010 ADJUSTMENT OF PLUNGER INTERLOCK 2111 PRIMARY CONTACT PENETRATION 2212 POSITIVE INTERLOCK ROLLER 2313 POSITIVE INTERLOCK 1000 MVA UNITS 2414 POSITIVE INTERLOCK M-26 UNITS 2515 POSITIVE INTERLOCK M-36 UNITS 2616 FRONT VIEW WITH FRONT COVER 4417 FRONT VIEW WITHOUT COVER 4518 MANUAL CHARGING HANDLE 4619 CLOSING SPRING GAG ACCESS 4720 TOGGLE LINKAGE POSITIONS 48-5021 CONTACT EROSION INDICATOR 5122 OPERATING ROD ASSEMBLY 5223 ML-18VL MECHANISM 53-5424 TRIP COIL LINKAGE 5525 CLOSE COIL AND LINKAGE 5626 FRONT VIEW OF ML-18VL MECHANISM 5727 CONTACT GAP 5827a CONTACT GAP ADJUSTMENT 5928 FLEX CABLE CONNECTION 6029 SAMPLE OPERATING SPEED GRAPHS 6130 CLOSE COIL PLUNGER GAP 6231 CONTROL SWITCHES 6332 TRIP COIL PLUNGER GAP 6433 SPRING WIPE 64

INDEX 70TROUBLE REPORTING FORM 68-69TABLE OF MEASUREMENTS AND ADJUSTMENTS 40ADDENDUM TO GEH-1802 (CUBICLE) 62



These instructions do not purport to cover all details or variations in equipment nor to provide for everypossible contingency to be met in connection with installation, operation or maintenance. Should furtherinformation be desired or should particular problems arise which are not covered sufficiently for thepurchaser's purposes, the matter should be referred to the Seller.

To the extent required, the products described herein meet applicable ANSI, IEEE and NEMA standards, but nosuch assurance is given with respect to local codes and ordinances because they vary greatly.

POWER/VAC® VLVACUUM CIRCUIT BREAKERWITH ML-18VL MECHANISM

1. INTRODUCTION

1.1. SAFETY

IT IS IMPERATIVE THAT ALL PERSONNELASSOCIATED WITH THIS EQUIPMENT READAND COMPLETELY UNDERSTAND THEWARNINGS LOCATED THROUGHOUT THISINSTRUCTION BOOK. FAILURE TO DO SOCAN RESULT IN DAMAGE TO PROPERTY,PERSONAL INJURY OR DEATH.

Each user must maintain a safety program for theprotection of personnel, as well as other equipment,from the potential hazards associated withelectrical equipment.

The following requirements are intended toaugment the user’s safety program but NOTsupplant the user’s responsibility for devising acomplete safety program. The following basicindustry practiced safety requirements areapplicable to all major electrical equipment such asswitchgear or switchboards. GE neither condonesnor assumes any responsibility for practices whichdeviate from the following:

1. ALL CONDUCTORS MUST BE ASSUMED TOBE ENERGIZED UNLESS THEIR POTENTIALHAS BEEN MEASURED AS GROUND ANDADEQUATE CAPACITY GROUNDING AS-SEMBLIES HAVE BEEN APPLIED TO PRE-VENT ENERGIZING. Many accidents havebeen caused by unplanned energization fromnon-recognized back feeds, equipmentmalfunc-tions, and from a wide variety ofsources.

2. It is strongly recommended that all equipmentbe completely de-energized, verified to be“dead”, then grounded with adequate capacitygrounding assemblies prior to anymaintenance. The rounding cable assembliesmust be able to withstand energizing faultlevels so that protective equipment may clearthe circuit safety. Additional discussion on thisconcept is covered in Chapter 20 of ANSI/NFPA 70B, Electrical Equipment Maintenance.

3. Although interlocks to reduce sone of the risksare provided, the individual’s actions whileperforming service of maintenance areessential to prevent accidents. Each person’sknow-ledge; mental awareness; and plannedand executed actions often determine if anaccident will occur. The most importantmethod of avoiding accidents is for allassociated personnel to carefully apply athorough understanding of the specificequipment from the viewpoints of its purpose,its construction, its operation and the situationswhich could be hazardous.

All personnel associated with installation, operationand maintenance al electrical equipment, such aspower circuit breakers and other power handlingequipment, must be thoroughly instructed, withperiodic retraining, regarding equipment in generalas well as the particular model of equipment whichthey are working.

Instruction books, actual devices and appropriatesafety and maintenance practices such as OSHApublications, National Electric Safety Code (ANSI)C2), National Electric Code, and National FireProtection Association (NFPA) 70B ElectricalEquipment Maintenance must be closely studiedand followed. During actual work, supervisionshould audit practices to assure conformance.

It is strongly recommended that all equipment becompletely de-energized, verified to be “dead”,then grounded with adequate capacity groundingassemblies prior to any maintenance.

2. DESCRIPTION

The PowerVac® VL vacuum circuit breaker is avertical lift, removable and interchangeable inter-rupting element, for use in metal-clad switchgear toprovide protection and control of electricalapparatus and power systems. The PowerVac® VLType PV-VL circuit breaker with ML-18VL mechan-



ism is available in continuous current ratings of1200, 2000 and 3000 amperes in accordance withindustry standards. In addition, extended ratings of3500, (not part of the original Magnablast offering)and 4000 amperes is available as well as a 5000ampere fan cooled option. Refer to the breakernameplate for complete rating information of anyparticular breaker. The nameplate also describesthe control power requirements for that breaker.The application of a breaker must be such that itsvoltage, current and interrupting ratings are neverexceeded. Since this book is written to include allratings of the breaker, as well as several designvariations, the instructions will be of a generalcharacter and all illustrations will be typical unlessotherwise specified.

3. RECEIVING, HANDLING AND STORAGE3.1. RECEIVING

Each breaker is carefully inspected beforeshipment. Immediately upon receipt of the circuitbreaker, an examination should be made for anydamage sustained in transit. If injury or roughhandling is evident, a claim should be filedimmediately with the transportation company, andthe nearest GE Sales Office should be notified.

3.2. HANDLING

It is expected that care will be exercised during theunpacking and installation of breakers so that nodamage will occur from careless or rough handling,or from exposure to moisture or dirt. Loose partsassociated with the breaker are sometimesincluded in the same crate. Check all parts againstthe packing list to be sure that no parts have beenoverlooked.

3.3. STORAGE

It is recommended that the breaker be put intoservice immediately in its permanent location. Ifthis is not possible, the following precautions mustbe taken to assure the proper storage of thebreaker.

The breaker should be stored in a clean location,free from corrosive gases or fumes. Particular careshould be taken to protect the equipment frommois- ture and cement dust, as this combinationhas a very corrosive effect on many parts.

Breakers should be carefully protected against con-densation, preferably by storing in a warm, dryroom of moderate temperature such as 40 to 100°F. High humidity may have an adverse effect onthe insulating parts and should be avoided.Circuit breakers for outdoor metal-clad switchgearshould be stored in the equipment only when poweris available and the heaters are in operation toprevent condensation.

Rollers, latches, etc. of the operating mechanismshould be coated with GE part No. 0282A2048P009(Mobil 28 red) grease to prevent rusting.

If the breaker is stored for any length of time, itshould be inspected periodically to see thatcorrosion has not started. Should the breaker bestored under unfavorable atmospheric conditions, itshould be serviced before being placed on line.

3.4 PACKING LISTWith your breaker, you should have received:1. Manual charging handle. (Part No.

0282A7227P001)2. Gag tool. (Part No. 0209B8043G003)3. Breaker Instruction Book - Contact your GE

office for additional copies or verification ofpresent revision.

4. (1) piece of edge protector (See section 4.1)5. (12) wire ties. (See section 4.1)6. Lower blocking plate and screws for lower

notch in positive interlock cam plate in existingbreaker cell units. (Kit # 254-089) NOTE: Thisassembly eliminates the test provision forclosing the breaker in the cabinet, except in the“connect” position, as has been recommendedto improve safety of the VL equipment.

7. Existing unit wiring and device WARNINGNOTICE sheet.

8. (1) GE tool parts kit (0282A3060G003) witheach breaker order of single or multiplebreakers.

9. A spring discharge interlock cam - to beinstalled if none exists in your switchgear cell.NOTE: Customer option to implement, ifrequired.

10. GE grease Part No. 0282A2048P009.

Contact your local GE office if you have notreceived the above materials.



4. INITIAL INSTALLATION PROCEDURES

Although GE has made every effort to assureinterchangability and satisfactory interface withexisting equipment, older equipment and fieldmodifications made over the years, may requireadditional procedures before the new vacuumbreaker can be installed in the cubicle.

4.1 DOOR WIRING INTERFERENCE

In some of the older GE Metal-Clad switchgearunits, the wiring from the door to the stationarystructure was run through a perforated steel wireassembly grill. (Figure 1.)

As the new replacement breaker is elevated, thefront cover MAY interfere with the subject wiringgrill, approximately 4” to 6” before the finalconnected position.

The front cover shield on the replacement breakeris wider than all previous AM breaker units. Due tothe large forces required to operate the existingstationary auxiliary switches, the operatingmechanism cannot be decreased in width.

If this condition exists, use the modification kitshipped with the breaker and make the followingmodifications to the switchgear cubicle.

1. Cut out the bottom section of the grill as shownin figure 1 on page 12.

2. Cover the sharp edges with the edge protectorfurnished with the breaker accessories.

3. Fold any wire back and re-tie with the furnishedwire ties.

4. Elevate the replacement breaker in accordancewith the instructions.

4.2 POSITIVE INTERLOCK TESTPROCEDURES

The positive interlock system functions to preventclosing the breaker contacts when the breaker isbeing raised or lowered and prevents raising orlowering the breaker when the breaker contacts areclosed. In most AM breaker Metal-Clad Switchgearunits, there is a breaker “Test Position” whichallows you to functionally test the breaker withoutconnecting to the bus. This position is usually about5” out from the breaker being fully inserted into thecubicle. When in the “test position”, a secondarycoupler cable must be used to connect thesecondary control circuits since the breaker isfully lowered position.

The lower “Vee” notch in the positive interlock camplate allows closing and opening the breakerelectrically.

FOR IMPROVED SAFETY, IT ISRECOMMENDED THAT THE ABILITY TOFUNCTIONALLY OPER-ATE THE BREAKER INTHE “TEST” POSITION BE ELIMINATED ANDTHAT BREAKER FUNC-TIONAL TESTING BEPERFORMED WITH THE BREAKERCOMPLETELY REMOVED FROM THE CUBICLE.

4.3 BY-PASS KIT INSTALLATION (See Figures 2 & 7).

The ability to electrically close and open thebreaker in the “Test Position” is eliminated bycovering the lower Vee notch in the positiveinterlock cam plate. Materials for accomplishingthis modification are provided in Kit #254-089furnished with the new vacuum breaker. This by-pass kit should be in-stalled on GE breaker cubiclesthat have a lower interlock roller Vee notch on thepositive interlock cam plate. Some GE breakercubicles do not have this lower Vee notch on theinterlock cam plate. In that case, the by-pass kit isnot required. If addi-tional by-pass kits are requiredfor the remainder of the switchgear line-up, orderKit #254-089.

WARNING: FAILURE TO FOLLOW THE INSTRUCTIONS BELOW COULD CAUSE A CLOSED BREAKER TO BE RAISED TOWARDS THE CONNECTED POSITION, CAUSING INJURY OR DEATH TO THE OPERATOR AND EXTENSIVE EQUIPMENT DAMAGE.

To make the modification proceed as follows:

1. Remove the existing clutch switch cover plateand discard (save the mounting hardware).

2. Measure and record the distance from thebottom of the cam plate to the bottom of the switchoperator bracket. See Figure 2.

3. Remove the existing switch operator bracket.

4. Install the new switch operator bracket suppliedwith the kit, using the two existing ¼ - 20 screws.Adjust the bracket in the exact same location as theremoved bracket, in relation to the motor activationswitch lever. Make sure that the lower notch in thepositive interlock cam plate is covered and that theedge is even with the front edge of the positiveinterlock cam plate. (Figures 2 and 7.)



5. Drill two #22 (.157) diameter holes in thepositive interlock cam plate from locations in newbracket supplied with kit. See Figure 2.

6. Install two #10-24 thread cutting screws(supplied with kit).

7. Install the new clutch switch cover platesupplied with the kit using the existing hardware.

8. All breaker cubicles that undergo this modi-fication to the positive interlock cam plate must bechecked according to the dimensions given inFigure 7. a. The 10-7/8” +1/16” -0” dimension from thebreaker to the front edge of the positive interlockcam plate must be verified and maintained prior toinserting a replacement PVVL vacuum breaker intothe cubicle. See Figure 7(C).

b. The 1/16” clearance between the stationaryflag, just behind the upper “Vee” notch and theinterlock roller must be maintained or reset ifrequired. The breaker should be in the fully raisedposition. See Figure 7(A).

4.4 CHECKING FOR PROPER INTERLOCKAND TRIP FREE FUNCTIONS BEFORE LOWER- ING THE BREAKER FROM THE ELEVATED POSITION.

When the breaker is in the fully elevated andconnected position, releasing the motor operatinghandle will return the positive interlock roller intothe upper notch in the interlock cam plate, closingthe interlock switches and energizing the circuitthat will charge the springs. The breaker may nowbe closed.

In order to lower the breaker from the connectedposition, the breaker must be open. If the breakeris not open, the operator can not, and should notbe able to engage the clutch or activate the motorcircuit. The positive interlock roller will remainlocked and will not allow the interlock cam plate tomove vertically far enough to activate theelevating motor.

To test the function of the positive interlock systemand trip free function, the following checks shouldbe made:

1. With the breaker closed and in the elevatedposition, the positive interlock roller on the breaker

must remain locked and not allow the motor handleto be moved far enough to engage the clutch andclose the clutch switch contacts that energizethe motor circuit. There should be 1/16” clearancebetween the clutch and motor coupler, when themotor handle is pulled forward. See Figure 7(A).

2. Disconnect the elevating motor plug from itssocket.

3. Trip the breaker to the open position.

4. Using the manual charging handle, charge theclosing springs in the breaker until the semaphoreshows “charged”.

5. Pull back the elevating handle on the motor sothat the interlock roller is at the dimension shown inFigure 7. (11/16” +0 -1/16) Hold it in this positionwhile pressing the manual close push button on thebreaker. The main power springs must dischargeand the breaker must remain open, as indicated bythe semaphores on the front of the breaker. Thisindicates that the breaker contacts will not closeduring raising or lowering the breaker.

5. ADJUSTMENTS TO BREAKER/SWITCH- GEAR INTERFACES.

The interfacing parts on all ratings of type AMbreakers and switchgear are functionally the same.

5.1 STATIONARY AUXILIARY SWITCH (MOC)

The Stationary Auxiliary Switch is an optionalswitch mounted in the switchgear cubicle. Whenthe breaker has been elevated to the fullyconnected position, the switach will be actuatedwhenever the breaker is closed. The switch isactuated by the plunger interlock (plunger)mounted on the top of the breaker mechanism.The switch has a number of “a” contacts (closedwhen the breaker is closed and open when thebreaker is open) and “b” contacts (open when thebreaker is closed and closed when the breaker isopen). The following paragraph defines theessential dimensions relating to the interfacingelements of the breaker and switchgear, to assurereliable performance.

The following elements are important factors whichcommonly affect the operation of the stationaryauxiliary switch.1. Plunger travel on the breaker.



2. The gap between the top of the plunger on thebreaker and the bottom of the rod on the stationaryauxiliary switch mechanism.3. Variations between breakers in the distancefrom the underside of the lift rail and the top of theplunger.4. Variations in the rotation requirements to“make” and “break” the stationary auxiliary switchcontacts.5. Condition of the plunger interlock componentson the breaker.6. Elevating mechanism limit switch consistency.7. Breaker elevating mechanism positive stops.8. Seismic events.

Some of these elements also affect the otherimportant interfaces required for reliable operationof the equipment, such as:1. Primary disconnect penetration.2. Secondary coupler penetration.3. The positive interlock mechanism.

A major goal in the design of switchgear hasalways been the interchangeabililty of breakers.GE Switchgear has been very successful inachieving that goal for many years. Analysis ofinstruction book adjustments, shop tolerances, andservice advice letters issued in recent years,however, has demonstrated that tolerances inswitchgear equipment installed and presentlyoperating can result in situations where it isimpossible to meet all adjustments or that anadjustment is brought into specification and itcauses a problem with another interface.

With specific reference to the plunger / stationaryauxiliary switch interface, the following instructionsand recommendations supersede all previousService Advice Letters and instructions. Refer toFigure 1 for details.

Nominal breaker plunger travel is 1-1/8”. Nominalauxiliary switch rod travel is 1-1/16”. It isimperative that a gap is present between the top ofthe plunger and the bottom of the rod, when thebreaker is in the fully connected position and thebreaker is open.

To assure the most reliable switch operation, it isrecommended that the plunger travel be measuredfor each breaker and recorded in maintenancerecords. It is further recommended that theauxiliary switch mechanism be adjusted, ifnecessary, to result in a gap that is in accordancewith the table given in Figure 10. It may require theroll pin which

secures the auxiliary switch mechanism plate to beremoved and a new hole drilled after loosening thetwo mounting bolts and moving the entire auxiliaryswitch mechanism up or down.

This action may mean future adjusting when and ifdifferent breakers are interchanged. Reliableswitch operation is critical and it may requirelimiting your interchangeability of breakers. At aminimum, the criticality requires adjustmentverification when swapping breakers.

Specifically, paragraph (f) on page 11 of ServiceAdvice Letter (S.A.L.) #073-323-1, dated 02-01-78is rescinded and the instruction in GEH-1802X ongap clearance is rescinded and both are replacedwith the gap dimension (“G”) given in the table ofFigure 10.

The plunger dimensions given in the breakerinstruction books are not rescinded because theyare correct nominal dimensions. It is permissible tolet the breaker adjustment be out of specification, ifit conflicts with the dimensions given in Figure 10.

5.2 PRIMARY CONTACT PENETRATION

The nominal contact penetration is 7/8” as shownin Figure 11. The tolerance on penetration is plus5/32”, minus 1/8” on non 1E equipment and plus1/16”, minus 1/8” on 1E equipment.

Reference Service Advice Letter # 073.323.1,which addresses methods to check both thepenetration and the contact wipe for 5kVequipment. The same methods and means ofadjustment also apply to 15kV equipment. GEH-1802X and the similar illustrations it containsshowing proper contact wipe patterns should alsobe consulted. It is essential to maintain propercontact penetration while maintaining thestationary auxiliary switch adjustment given inFigure 10.

5.3 POSITIVE INTERLOCK

The purpose of the positive interlock it to preventmoving the breaker to or from the connectedposition while the main contacts are closed, and toprevent closing the contacts unless the breaker isin the fully connected position. These importantsafety features are achieved by means of thepositive interlock roller on the right side of thebreaker and positive interlock cam and stationary“flag” on the switchgear, as shown in Figure 7.



The following adjustments are made at the factoryand verified for proper operation per Figure 7. Thedistance from the top of the stationary flag to thetop of the switchgear guide rails is set. Thismaintains the surface upon which the breakerwheels rest when the breaker is lowered. Theupper elevating motor limit switch is then adjustedto achieve a roller to flag clearance of 1/16” to 1/8”as shown in Figure 7. The limit switch de-energizesthe elevating motor circuit and should be activatedwhen the primary disconnects and secondarycoupler reach their nominal contact penetrationposition. If the timing of this sequence is off, thecubicle must be adjusted back to factoryspecifications.

Instructions for positive interlock adjustment aredetailed on Figures 13, (1000 MVA Equipment),Figure 14, (M-26 Equipment); and Figure 15, (M-36Equipment). These adjustments are also detailedin instruction book GEH-1802X.

5.4 SECONDARY COUPLER

On the top front of the breaker, there is a blackplastic block which holds male secondary couplerpins. This block should make contact with, andslightly raise a spring loaded black plastic blockwhich holds female secondary coupler sockets onthe switchgear. The contact depression should be1/8”. The stationary block is adjustable in thevertical direction as described in Service AdviceLetter 073-323-1. It is not always possible to havethe black plastic blocks in contact over their entireflat surface. Often, the rear of the blocks areengaged while a gap exists along the front edge.This is an acceptable condition. The contactingblock surfaces should touch and the female blockedge move upward between 1/32” to 1/8”.

5.5 SPRING DISCHARGE CAM

The purpose of the spring discharge interlock is todischarge all stored energy in the breakermechanism whenever the breaker is withdrawnfrom the cubicle. The discharge interlock is locatedon the left side of the breaker. The springdischarge cam mounted in the switchgear shoulddischarge the breaker closing spring when thebreaker is lowered.

The cam has minimal adjustment provision. Theholes may be slightly slotted to adjust the camvertically to allow discharge when the breakerwheels reach 1/8” to ¼” height above the floor.

Refer to GE drawing 0184B7344 for instructions oninstalling a spring discharge cam in the switchgearcubicle.

5.6 STOPS

The stop pins and stop bolts on the elevatingmechanism are emergency mechanical stopswhich would come into use only if the upperelevating motor switch is completely out ofadjustment or has failed. Elevating against thesestops may be quite audible and the operator shouldrelease the clutch handle, de-energizing theelevating motor circuit or, the elevating motorcircuit protective fuse will open to protect themotor. The stop bolts should be set to 3/32 to 1/8”clearance and only set after all other elevatingadjustments are made.

5.7 GROUND

A visual check should be made to observe theground connection. The ground shoe on themoveable breaker is designed to have a nominalengagement of 1-½” + ¼” vertically with the steeland copper spring loaded disconnects of theground device in the switchgear.

5.8 POSITION SWITCH (TOC)

The position switch is an optional device mountedin the rear left side of the switchgear cubicle. Theswitch contacts operate when the liftingmechanism is in either the fully raised or fullylowered position. Switch operation should bechecked with the breaker withdrawn manually andthe equipment de-energized, and again electrically,with the breaker in the cubicle. Refer to ServiceAdvise Letter 073-326.1, dated 5-23-78 for adescription of design changes made to improve theswitch operating mechanism in 1978.

6. TYPICAL WIRING DIAGRAMS



Figures 8 and 9 show typical wiring diagrams forPowerVac® VL breakers.

Replacement breakers for old units with solenoidmechanisms (AM breakers with MS type mech-anisms) are typically wired per the drawing inFigure 8.

Replacement breakers for old units with storedenergy mechanisms (AM breakers with ML typemechanisms). are typically wired per the drawing inFigure 9.

The wiring on your breakers may be different.Consult your nameplate for the correct drawingnumber and call your local GE office for additionalcopies of this drawing are required.



FIGURE 1INTERIOR VIEW OF STATIONARY CUBICLE

Stationary Aux Switch

SB Control Switch

GrillCutout

Front Door

Edge Protector

Wire Grill



FIGURE 2INTERLOCK MODIFICATION

Positive Interlock Cam Plate

Record this dimension beforeremoving old switch operatorbracket.New bracket should be adjustedto this dimension.

SWITCH OPERATOR BRACKET

New Switch Operator Bracket(Shown Blocking Lower Notch)



FIGURE 3MOTOR OPERATOR SWITCH ACTUATOR



FIGURE 4ELEVATING MOTOR TROUBLESHOOTING

TROUBLE SHOOTING

IF ELEVATING MOTOR DOES NOT OPERATE:

CORRECTIONS

1. Check power supply

2. Check fuses UL

3. Check and adjust mechanical clutch linkage to clutch switch LC

4. Check LC for proper performance

5. Check motor switch

6. Check motor

7. Adjust upper LE and lower LF limit switches for proper breaker position

8. Check and adjust leaf springs to provide proper tilt to operate limit switches

9. Check plug and receptacle for proper connections

10. Check clutch and mechanism



FIGURE 5SCHEMATIC DIAGRAM

VERTICAL LIFT ELEVATING MECHANISM

DO NOT USE RAISE/LOWER SWITCH TO STOP & START MOTOR.



FIGURE 6STATIONARY STRUCTURE WIRING



FIGURE 7BY-PASS KIT INSTALLATION



FIGURE 8TYPICAL BREAKER WIRING DIAGRAM

(REPLACEMENT FOR BREAKERS WITH MS MECHANISMS)



FIGURE 9TYPICAL BREAKER WIRING DIAGRAM

(REPLACEMENT FOR BREAKERS WITH ML MECHANISMS)



FIGURE 10ADJUSTMENT OF PLUNGER INTERLOCK

Adjustment of plunger interlock - Breaker raised to connect position. Gap adjustment as a functionof breaker plunger travel to assure proper switch operation.

P G RPlungerInterlockTravel

Gap between top of plunger interlock andbottom of aux. switch rod

Resulting travel of the aux. switch rod

(To bemeasured) Min. Max. Min. Max.

1-1/16 .001 1/16 1” 1-1/16



FIGURE 11PRIMARY CONTACT PENETRATION



FIGURE 12POSITIVE INTERLOCK ROLLER



FIGURE 13POSITIVE INTERLOCK 1000 MVA UNITS



7. FEATURES

7.1. SAFETY PRECAUTIONS.

This circuit breaker uses powerful springs forenergy storage. DO NOT WORK ON THEINTERRUPTERS OR THE MECHANISM UNLESSTHE CIRCUIT BREAKER IS IN THE "OPEN"POSITION AND BOTH THE CLOSING ANDOPENING SPRINGS ARE EITHER DISCHARGEDOR GAGGED AND ALL ELECTRICAL POWER ISREMOVED. These precautions are required toprevent accidental operation. Anyone working onthe circuit breaker should be familiar with thecontents of this instruction book.

The circuit breaker has been shipped in theCLOSED position. After removing packingmaterial, open the breaker by pushing in firmly onthe manual trip button (8, Fig. 16), while keepinghands away from moving parts. Verify that theoperation counter advances one count.

Closing and opening springs are now in theirdischarged positions. Check this by first pressingthe manual close button, then the manual tripbutton. The indicator flags on the front of thebreaker should show "OPEN" and "DISCHGD". Allmechanical and electrical checks should becompleted before putting breakers in service.

7.2. INTERLOCKS

Each PowerVac® VL vacuum circuit breaker isprovided with the following interlocks:

7.2.1. RATING INTERFERENCE PLATE

This interlock permits only a breaker with amatching continuous current, voltage andinterrupting rating to be inserted into a metal-cladcompartment of identical rating. The ratinginterference plate must be adjusted to match thecurrent rating of the compartment. This adjustmentis done by positioning a pin on the lower left side ofthe breaker truck to align with the proper cubicleinterference plate.

7.2.2. POSITIVE INTERLOCK SYSTEM

The positive interlock system prevents connectingor disconnecting the breaker when the breakervacuum contacts are closed.

This interlock feature is accomplished by a rollerand lever located on the interlock shaft, on theright side of the breaker (Fig. 16 & 17). When thebreaker is closed, this roller and lever are lockedin

their vertical positions, preventing the clutchhandle from being pulled forward and engaging theelevating motor in the cubicle. The closed breakermust be manually or electrically tripped openbefore the clutch handle can connect the elevatingmotor to the elevating mechanism, and allow thebreaker to be raised or lowered.

When the breaker is raised or lowered, the positiveinterlock roller and lever are forced forward by thepositive interlock plate on the right side of theframe and top plate. The interlock roller and leverare held in this forward position during raising andlowering operations, preventing the breaker frombeing closed in any intermediate position betweenthe connect and the fully lowered position. Anattempt to close the breaker will cause the storedenergy springs to discharge without the breakercontacts closing or moving. The breaker must befully connected (raised) and the clutch handle mustbe released before the breaker can be closed.Releasing the clutch handle allows the interlockplate in the cell to move downward allowing theinterlock roller and lever to return to their normalvertical positions. The breaker may then beclosed. When in the fully lowered position, thebreaker must be pulled forward 2-1/4” in thecubicle and the test coupler installed to allow thebreaker to be closed electrically.

7.2.3. SPRING DISCHARGE SYSTEM

The spring discharge lever and pin, (Fig. 17) areprovided as a safety feature for operatingpersonnel, and to prevent closing the breaker inthe lowered position in the cell.

The spring discharge pin and lever operate inconjunction with the spring discharge bracketmounted in the front left side of the vertical frameangle in the cubicle. The spring discharge pin rideson the cam edge surfaces of the spring dischargebracket, when the breaker is inserted into orwithdrawn horizontally from the cell.

If the breaker is outside the cell, and an operatorcharges the stored energy mechanism, the springdischarge bracket will lift the discharge pin anddischarge the stored energy springs, when thebreaker is pushed into the lowered position in thecell. When the breaker is fully inserted into thelowered position within the cell, the discharge pin isheld in an upward position by the spring dischargebracket, and prevents the breaker from beingclosed. Attempting to charge a breaker in this fullinward and lowered position will dischargethe



stored energy mechanism without closing thebreaker.

8. OPERATION

The PowerVac® VL vacuum circuit breaker uses asealed vacuum power interrupter to establish andinterrupt a primary circuit. Primary connections tothe associated metal-clad switchgear are made bypole assemblies, electrically and mechanicallyconnected to the vacuum interrupters. Moldedsupports, one per pole on a three pole breaker,provide interchangeable mountings for the primarypoles, interrupters, and heat dissipation fins (whereused). The operating mechanism provideshorizontal motion at each pole location in order tomove the lower contact of the vacuum interruptersfrom an open position to a spring-loaded closedposition and then back to the open position oncommand.

The ML-18VL mechanism (Figs. 17 & 23) is thestored-energy type and uses a gear motor tocharge a closing spring. During a closing operation,the energy stored in the closing spring is used toclose the vacuum interrupter contacts, charge thewipe springs which load the contacts, charge theopening springs, and overcome bearing and otherfrictional forces. The energy then stored in the wipeand opening springs will open the contacts duringan opening operation.

Closing and opening operations are controlledelectrically by the control switch on the metal-claddoor or remote relaying. Mechanical control isprovided by manual close and trip buttons on thecircuit breaker.

The closing spring may be manually charged, anda method for slow closing the primary contacts isavailable when the circuit breaker is withdrawnfrom the metal-clad cubicle. (See Section 10) Themechanism will operate at the ac or dc voltageindicated on the circuit breaker nameplate.

8.1. CLOSE SPRING CHARGING

Figure 23 shows a front view of the ML-18VL in aschematic form. The primary contacts are openand the closing spring is charged. The closingspring charging system consists of a closing spring(1, view B) mounted on the left side of the breakerand the electrical charging system mounted on theright side of the breaker. Both components arefastened

to the cam shaft (2, view B). A manual chargingsystem (3, view A) is provided so that themechanism can be slow closed and the closingspring can be charged if there is a loss of electricalcontrol power.

Spring charging is accomplished electrically by arotating eccentric on the output shaft of a gearmotor driving pivoted charging arms (4, view C).The charging arms oscillate about the centerline ofa ratchet wheel (5, view C). A driving pawl (6, viewC), mounted within the charging arms, oscillateswith the charging arms. Starting from its rear-mostposition, the charging arms rotate forward, whilespring forces engage the driving pawl with a toothon the ratchet wheel. The ratchet wheel isadvanced by the rotating charging arms and pawlassembly. Advancement of one tooth spacing isprovided for each oscillation of the system. Theratchet motion is restricted to one direction by aspring-loaded holding pawl that prevents theratchet wheel from going backwards as thecharging arms oscillate back to pick up the nexttooth. Thirteen complete cycles of the chargingarms are needed for a full charge of the closingspring.

The efficient, compact gear motor accomplishesthis action in about two seconds. When thecharging cycle is complete, the ratchet wheel ispositioned so that a missing tooth is adjacent to thedriving pawl and any motor overspin will not drivethe ratchet wheel, thus preventing damage to thesystem.

When the spring is completely charged, theassembly is retained in that position by the closelatch until it is desired to close the circuit breaker.

The closing coil cannot be electrically energizedunless the closing spring is completely charged.This action is prevented by the 52/CHG switch inthe closing circuit.

The manual charging system (3, view A) worksdirectly on the cam shaft where a one-way clutch(7, view A), driven by a manual handle, providesrotation of the ratchet wheel. Manual pumping ofthe handle advances the ratchet wheel and theholding pawl prevents counter-rotation while thehandle is returning for another stroke. Approxi-mately eight complete strokes of the manualhandle are required for one complete spring-charging operation. When the spring chargeindicator (8, Fig. 17) shows "CHARGED", MANUALCHARGING MUST BE DISCONTINUED TOAVOID MECH-ANISM DAMAGE.



8.2. CLOSING OPERATION. (REFER TO FIG.23)

By either energizing the close solenoid ordepressing the manual close button, the close latch(8, view C) is rotated, releasing the closing spring(1, view B). This action releases the energy in theclosing spring and transmits it to the closing cam(9, view D) and closing roller (10, view D) causingthe linkage to rise until the close prop (11, view D)can slip under the close roller (10, view D) andhold the linkage in place. As the linkage moves,the output crank (12, view D) rotates the crossshaft (13, view D) which in turn rotates the phasebell cranks (14, view E) on all three poles. Therotation of the phase bell cranks compresses thetwo opening springs (15, view E) on poles 1 and 3,closes the vacuum interrupters, and compressesthe wipe springs (16, view E) on each pole. Therotation of the cross shaft (13, view D) alsochanges the auxiliary switch (7, view D) position.The position flag on the front panel will thenindicate "CLOSED". After the breaker is closed, thecharging motor is again energized and the closingspring is charged as described under "CLOSESPRING CHARGING". Spring charging is possiblewhen the breaker is in the closed position becausethe linkage is held in place by the prop.

8.3. OPENING OPERATION. (REFER TO FIG.23)

By either energizing the trip solenoid (18, view B)or depressing the manual trip button (23, view B),the trip latch (19, view D) is rotated, permitting thelinkage to collapse. The vacuum interruptercontacts will then open under the force of the wipesprings (16, view E) and opening springs (15, viewE). At the end of the opening stroke, the centerphase wipe spring assembly hits a stop on theframe limiting overtravel and rebound. Rotation ofthe cross shaft from the closed to the open positionoperates the auxiliary switch (17, view D) openingthe trip coil circuit. When the closing spring hasbeen recharged, the linkage is reset allowing thetrip latch to rest in place on the trip roller, ready foranother closing operation.

If the closing spring has not been recharged, thetrip latch will be held out of position. A latch-checking switch (LCS) (21, view C) will not closeunless the latch is in its normal position. Thecontacts of the latch-checking switch are part ofthe closing circuit and will not allow for an electricalclose until the latch is reset.

8.4. TRIP FREE OPERATION.

The linkage is mechanically trip-free in anylocation

on the closing stroke. Electrically energizing thetrip coil while closing will, after the auxiliary switchcontacts change position, rotate the trip latch andpermit the circuit breaker to open fully. The linkagewill reset as in a normal open operation and theclosing spring will recharge as described under"CLOSE SPRING CHARGING".

9. CONTROL CIRCUIT

A typical PowerVac® VL circuit breaker ML-18VLmechanism wiring diagram is shown in Fig. 8 and9. Check the wiring diagram supplied with theactual circuit breaker for its wiring.

The close spring charging motor circuit isestablished through the Close Latch Monitor Switch(CL/MS) if the close latch is reset and the SpringMotor Limit Switch (SM/LS) if the closing spring isdischarged. When the closing spring is charged,the SM/LS interrupts the circuit.

The close coil circuit is established through twonormally closed 52Y relay contacts, and the LatchChecking Switch (LCS), if the trip latch is reset. Anauxiliary switch contact 52B is also in series withthe close coil and closes when the breaker is openand opens when the breaker is closed. During aclose operation, cam rotation closes the SM/LScontact allowing the 52Y relay to be energized. The52Y relay opens its contacts, in the close coilcircuit and seals itself in through one of its owncontacts. This seal-in action prevents reclosing ona sustained close command. The close signal mustbe removed to drop out the 52Y relay andreestablish the closing circuit. This provids an anti-pump feature.

Circuit breaker-mounted auxiliary switch contactsnot used in the control circuit are brought out forcontrol and indication functions. The metal-cladequipment may provide a breaker-operatedstationary auxiliary switch for additional contacts.

10. MECHANICAL CHECKING AND SLOW CLOSING

10.1. VISUAL INSPECTION

Visually inspect the circuit breaker for any signs ofdamage or loose hardware.

10.2. CLOSING SPRING CHARGING

Manually charge the breaker closing spring usingthe charging handle provided (1, Fig. 18). Theclosing spring is charged by a ratchetingmech-



anism that advances one ratchet tooth at a time.When the spring is fully charged, the spring load isheld by the closing latch. The spring indicator (6,Fig. 16) changes from "DISCHGD" to "CHARGED',and a positive snap is be heard as the springtravels over center.

CAUTION: AFTER THE SPRING IS COM-PLETELY CHARGED, AS INDICATED ABOVE,FURTHER FORCING THE CHARGING HANDLEMAY CAUSE DAMAGE TO THE CLOSINGLATCH AND ITS ASSOCIATED PARTS.

10.3. CLOSING SPRING GAGRemoving the mechanism cover and inserting thetip of the closing spring gag tool (3, Fig. 19)between the end of the spring and the spring guide,engaging the détentes on the gag tool into the slotsin the closing spring guide.

With the gag tool in position depress the manualclose button. This action will partially discharge theclosing spring and also partially close the vacuuminterrupter contacts. Do not energize the secondarycontrol circuit at this time.

CAUTION: USE OF THE GAG TOOL SHOULDONLY BE ATTEMPTED WHEN THE BREAKER ISOUT OF THE CUBICLE.

10.4. SLOW CLOSINGTo manually slow close the breaker contacts,install the closing spring gag, as described above.Put the manual charge handle on the manualcharge lever and move the handle up and down.The breaker will be fully closed when the springcharge indicator shows "CHARGED"

CAUTION: WITH THE GAG TOOL INSTALLED,THE BREAKER CLOSED, AND OPENINGSPRINGS CHARGED, THE BREAKER CAN BETRIPPED AT FULL SPEED.

10.5. GAG TOOL REMOVALTo remove the gag tool, the closing spring must befully charged. If the spring charge indicator doesnot show "CHARGED" in the window, manuallycharge the spring until it does. Lift up and push inon the gag tool to clear the détentes on the gagtool from the slots in the closing spring guide.While holding the gag tool up, remove it from theopening. Close the gag hole cover. For safety, firstclose the breaker by depressing the manual"CLOSE" button and then depress the manual"TRIP" button. All stored energy is now removedfrom the breaker.

11. DIMENSIONAL CHECKSWith the breaker closed and the gag tool installed,remove the front portion of the breaker top platebefore performing the following dimensionalchecks:

11.1. PRIMARY CONTACT EROSIONIn the closed position, the erosion disk (5, Fig. 21),located below the operating rod insulator, isaligned with a reference arm (4, Fig. 21) on newinterrupters. As contact erosion occurs, the erosiondisk will move upward from alignment with thatreference arm. When erosion reaches 1/8 inch, thePOWER/VAC VL interrupters should be replaced.DO NOT READJUST THE ALIGNMENT OF THEEROSION INDICATOR ARM EXCEPT WHENINSTALLING A NEW VACUUM INTERRUPTER.

11.2. SPRING WIPEWith the breaker closed and the closing springgagged, measure with a feeler gauge and recordthe distance between the top of the wipe indicatorand the bottom of the erosion disk for each phase(see Figure 33 Dimension W). Trip the breaker withthe closing spring gag tool still installed andmeasure and record the distance between the wipeindicator and erosion disk. Subtract the closedposition measurement from the open positionmeasurement. The result is the amount of wipe oneach individual pole. The wipe is to be greater than0.075 inch. Adjustment is not required until wipe is0.075 inch or less. If adjustment is required seeWIPE ADJUSTMENT in MECHANICAL ADJUST-MENTS section.

The ML-18VL mechanism is furnished with verylow gradient wipe springs so that adjustment is nota precision operation and considerable loss of wipecan be tolerated without affecting performance.

11.3. CONTACT GAPThe method of measuring the contact gap is asfollows: With the breaker in the open position, theclosing springs charged, and the closing spring gagtool installed, apply a piece of masking tape to thesurface of the operating rod insulator as shown inFigure 27. Using a reference block, make a markon the tape near the top on all three poles. It is alsoadvisable to put a reference mark on the tape toidentify to which pole the tape is applied. Removethe closing spring gag tool and close the breaker.Using the same procedure as above, re-mark thetape. This new mark will be near the bottom of thetape. Trip the breaker, remove the tapes and re-apply them to a flat surface. Measure the distancebetween the two lines. A caliper will give anaccurate reading of the contact gap, Dimension G.



The gaps must be between the 0.60 inchmaximum for the center phase and 0.54 inchminimum for all phases. It is not necessary that allreadings correspond. A properly adjusted breakeroften has more gap and wipe on the center polethan on the outside poles.

CAUTION: DO NOT ALLOW ANYTHING TOCOME IN CONTACT WITH THE INTERLOCKROLLER ON THE RIGHT SIDE OF THEMECHANISM, OR THE SPRING DISCHARGEPIN ON THE LEFT SIDE OF THE MECHANISM.

11.4. CLOSE COIL PLUNGER GAP

The close coil plunger gap is shown in Figure 30.With the closing spring discharged, operate theplunger to make certain that the plunger movesfreely over its full stroke in the coil. To check theclosing coil plunger gap the breaker should beopen and the closing spring charged and gagged.Dimension C is obtained by depressing the closeplunger button until resistance is felt. The gapbetween the plunger button and the coil housingshould be between 0.35 and 0.40 of an inch.

11.5. TRIP COIL PLUNGER GAP

The trip coil plunger gap is shown in Figure 32.With the breaker in the open position and theclosing spring in the charged position, make certainthat the trip linkage and trip shaft move freely overthe full plunger travel. To check the trip coilplunger gap adjustment, the breaker is to be closedwith the closing spring discharged. Dimension Tbetween the plunger button and the coil housingshould be between 0.20 and 0.25 inch. Thisdimension is obtained when the trip plunger buttonis depressed until resistance is felt. If the breaker isequipped with an optional second trip coil, usesame procedure.

11.6. CONTROL SWITCH ADJUSTMENT

The breaker is to be in the open position with theopening and closing springs discharged. Thisresults in the control switch plungers being in thedepressed position. The switches to be checkedare shown in Figure 31. On the LCS and stackedswitches (SM/LS & CHG), the plunger rod is to berecessed within the rear of the switch body. Therecess should measure between 0 and 1/32 inch.This is a visual check. The CL/MS switch withwiring terminals on the side is to be adjusted asdescribed above. For the CL/MS switch with wiringterminals on the rear, the plunger is set to 0.99 to1.01" from its mounting bracket.

12. ELECTRICAL CHECKS

12.1. ELECTRICAL OPERATION

To check the electrical operation, attach asecondary test coupler to the circuit breakerconnector. Check the control voltage on thenameplate and close and open the breaker severaltimes.

CAUTION: REPEATED OPERATIONS AT ARATE EXCEEDING TWO PER MINUTE MAYCAUSE CHARGING MOTOR OVERHEATINGAND FAILURE.

Leave the circuit breaker in an open and springdischarged condition after checks are completeand refer to metal-clad instruction book GEH-1802X before inserting the circuit breaker into ametal-clad unit. Reinstall the front cover if it hasbeen removed.

12.2. HIGH-POTENTIAL TEST

If high potential tests to check the integrity of theinsulation are required, the AC high potential testdescribed below is strongly recommended. DChigh potential testing is not recommended. Thefollowing procedure must be adhered to.

CAUTION: IF DC HIGH POTENTIAL TESTING ISREQUIRED, THE DC HIGH POTENTIALMACHINE MUST NOT PRODUCE PEAKVOLTAGES EXCEEDING 50 kV.

12.2.1. PRIMARY CIRCUIT

Electrical checking consists of electrical breakeroperation, primary and secondary wiring high-potential testing (if required), primary circuitresistance (if required), POWER/VAC interrupterhigh-potential testing, and insulation resistance toground.

The breaker should be hipotted in the closedbreaker mode. An AC hipot machine capable ofproducing the test voltages shown below may beused to hipot the breaker phase to phase andphase to ground. BREAKER VOLTAGE TEST VOLTAGE

4.16 kV 14 kV7.2 kV 27 kV

13.8 kV 27 kV

The machine should be connected with its outputpotential at zero and the voltage increased at500



vps to the test voltage and that voltage maintainedfor 60 seconds. The voltage should then be returnedto zero and the hipot machine removed from thecircuit. Do not exceed the test voltage indicated forthe applicable breaker voltage rating.

12.2.2. SECONDARY CIRCUIT

Prior to hipotting the breaker secondary circuit,disconnect the motor leads and thread a wireconnecting all secondary coupler pins. Increase thevoltage to 1125 volts (rms) 60 Hz and maintain for 60seconds. Reduce the voltage to zero and remove thehipot machine from the circuit. Remove the wireconnecting the secondary coupler pins and reconnectthe motor leads.

12.3. PRIMARY CIRCUIT RESISTANCE

A resistance check of the primary circuit may bemade with the breaker closed. Use a low resistancemeasuring instrument which measures micro-ohms.The 100 ampere reading should be 5 to 25 micro-ohms for a 3000 amp breaker, 25 to 50 micro-ohmsfor a 2000 amp breaker and 30 to 60 micro-ohms fora 1200 amp breaker when connected across theprimary and secondary stabs on the breaker.

12.4. VACUUM INTERRUPTER INTEGRITYTEST

CAUTION: X-RADIATION WILL BEPRODUCED IF AN ABNORMALLY HIGH VOLTAGEIS APPLIED ACROSS A PAIR OF ELECTRODES INA VACUUM. X-RADIATION WILL INCREASE ASVOLTAGE INCREASES AND/OR AS CONTACTSEPARATION DECREASES. ONLY TEST ACORRECTLY-AD-JUSTED CIRCUIT BREAKER.

DURING A HIGH POTENTIAL OR A VACUUMINTEGRITY TEST, ANY X-RADIATION WHICH MAYBE PRODUCED WILL NOT BE HAZARDOUS AT ADISTANCE SAFE FOR HIGH POTENTIALTESTING, IF THE TEST IS CONDUCTED AT THEREC-OMMENDED VOLTAGE AND WITH THENORMAL OPEN CIRCUIT BREAKER GAP.

DO NOT APPLY VOLTAGE THAT IS HIGHER THANTHE RECOMMENDED VALUE. DO NOT USECONTACT SEPARATION THAT IS LESS THANTHE RECOMMENDED OPEN-POSITION BREAKERCONTACT GAP.

This test of the vacuum interrupter will determine itsinternal dielectric condition and vacuum integrity.

A vacuum integrity test is performed using an AChigh potential tester. A vacuum integrity test of theinter-rupter is required to insure that no loss ofvacuum has occurred. With the breaker open,individually check each interrupter by connecting thehi-pot machine “Hot,” lead to the primary bushing andthe ground lead to the load side bushing. If themachine has a center point ground, the connectionscan be made either way. Apply 36 kV (rms) 60 Hz at500 vps and hold for 10 seconds. If no breakdownoccurs, the interrupter is in acceptable condition.After the high potential volt-age is removed,discharge any electrical charge that may be presentthrough the internal ground of the test machine or bya grounded cable to one of the phase bushing.

If a failure of a vacuum bottle should occur during theintegrity test, the test procedure should be reviewedand the pole piece cleaned. GE failure rate forvacuum bottles is 0.0007 per field unit. Note thevoltage level at failure on the first test, and retest thephase pole piece. If the pole piece passes test, thevacuum bottle is acceptable STOP.If the test fails again but at a higher voltage levelthan was observed in the first test, clean the polepiece and retest. If a failure of the integrity testoccurs a third time, consider the vacuum bottle tohave lost vacuum and replace the complete polepiece as described under Repair of InterrupterAssembly

Although a AC high potential test is recommended forChecking the vacuum integrity, a DC high potentialtest can also be conducted on the vacuuminterrupters at 50 kV and held for 10 seconds with therestrictions noted as follows.

No attempt should be made to try to compare the onevacuum interrupter with another nor to correlate thecondition of any interrupter to low values of DCleakage current. There is no significant correlation.

After the high potential voltage is removed, dischargeany electrical charge that may be retained.

CAUTION: MANY DC HIGH POTENTIAL MA-CHINES ARE HALFWAVE RECTIFIERS. THISTYPE OF HIPOT TESTER MUST NOT BE USEDTO TEST VACUUM INTERRUPTERS. THECAPAC-ITANCE OF THE POWER/VAC BOTTLESIS VERY LOW AND THE LEAKAGE IN THERECTIFIER AND ITS DC VOLTAGE MEASURINGEQUIPMENT IS SUCH THAT THE PULSE FROMTHE HALFWAVE RECTIFIER MAY BE IN THENEIGHBORHOOD OF 120 Kv WHEN THEMETER IS ACTUALLY READ-



ING 40 kV. IN THIS CASE, SOME PERFECTLYGOOD BOTTLES CAN SHOW A RELATIVELYHIGH LEAKAGE CUR-RENT SINCE IT IS THEPEAK VOLTAGE OF 120 kV THAT ISPRODUCING ERRONEOUS BOTTLE LEAKAGECURRENT. IN ADDITION, ABNORMAL X-RADIATION WILL BE PRODUCED.

An acceptable AC high potential machine is avail-able from: GE Company, Burlington, Iowa, CatalogNumber 282A2610P001. The following machinesare also acceptable.AC machines: Hipotronics Model 7BT 60A Hipotronics Model 60HVT Biddle Cat. 222060 Phoenix Model 7BT 60ADC machines: Hipotronics Model 860PL Hipotronics Model 880PL

12.5. INSULATION TESTS

The primary circuit insulation on the breaker maybe checked phase to phase and phase to groundusing a 2500 Volt or other suitable megohmeter.

Since definite limits cannot be given forsatisfactory insulation values, a record should bekept of the megohmeter readings as well astemperature and humidity readings. This recordshould be used to detect any weakening of theinsulation from one check period to the next.Generally, readings should equal or exceed 10,000megohms.

To measure the breaker secondary circuitinsulation resistance, disconnect the motor leadsand thread a wire connecting together allsecondary coupler pins. The measurement is madeby connecting a 500 Volt megohmeter from thewire to ground.

13. CHECKING AND INSTALLING BREAKERS

Roll the PV-VL breaker into the cell (frame & topplate). If the breaker stored energy springs werecharged, the spring discharge lever, located on theleft side of the breaker, will be actuated by thespring discharge bracket and discharge the storedenergy springs, (closing and opening springs). Theyellow semaphore on the front of the breaker willindicate “DISCHGD”.

The breaker cannot be closed when it is fullyinserted into the cell, in the lowered position.

The breaker may be operated electrically when inthe lowered position by completely removing itfrom

the cubicle and connecting the breaker test coupleraccessory set (optional). The breaker functionsmay now be checked electrically or manually viathe breaker control switch on the switchgear unit,or the manual push buttons on the breaker front.

14. MAINTENANCE

14.1. GENERAL

POWER/VAC VL circuit breakers have beendesigned to be as maintenance-free as practicable.They include features such as sealed vacuuminterrupters and long-life synthetic greases whichcontribute to many years of trouble-free per-formance with a minimum amount of maintenance.

If maintenance on the PowerVac® VL breaker isbeing performed to an extended schedule such asa 5-year or 10-year program, the vacuuminter-rupter integrity test should be performed if thebreaker is removed for reasons other thanscheduled breaker maintenance, and it has beenmore than one year since the last vacuum integritytest, a test should be performed.

Both long and short term maintenance of allelectrical equipment is essential for reliability andsafety. Maintenance programs MUST be custom-ized to the specific application, well planned, andcarried out consistent with both industry experienceand manufacturer’s recommendations. Local en-vironment must always be considered in suchprograms, including such variables as ambienttemperatures, extreme moisture, number ofoperations, corrosive atmosphere or major insectproblems and any other unusual or abusivecondition of the application.

One of the critical service activities, sometimesneglected, involves the servicing and calibration ofvarious control devices. These devices monitorconditions in the primary and secondary circuits,sometimes initiating emergency corrective actionsuch as opening or closing circuit breakers. In viewof the vital role of these devices, it is important thata periodic test program be followed. As wasoutlined above, it is recognized that the intervalbetween periodic checks will vary depending uponenvironment, the type of device and the user’sexperience. It is the General Electric recom-mendation that, until the user has accumulatedenough experience to select a test interval bettersuited to his individual requirements, all significantcalibrations should be checked at an interval ofone to two years.



To accomplish this, protective relays can beadequately tested using field test sets. Specificcalibration instructions on particular devicestypically are provided by supplied instructionbooks.

Instruction books supplied by manufacturersaddress components that would normally requireservice or maintenance during the useful life of theequipment. However, they can not include everypossible part that could require attention,particularly over a very long service period orunder adverse environments. Maintenancepersonnel must be alert to deterioration of any partof the supplied switchgear, taking actions, asnecessary, to restore it to serviceable status.

Industry publications of recommendedmaintenance practices such as ANSI/NFPA 70B,Electrical Equipment Maintenance, should becarefully studied and applied in each user’sformation of planned maintenance.

Some users may require additional assistance fromGE in the planning and performance ofmaintenance. GE can be contacted to eitherundertake maintenance or to provide technicalassistance such as the latest publications.

The performance and safety of this equipment maybe compromised by the modification of suppliedparts or their replacement by non-identicalsubstitutes. All such design changes should bequalified by GE factory engineering.

The user should methodically keep writtenmaintenance records as an aid in future serviceplanning and equipment reliability improvement.Unusual experiences should be promptly com-municated to GE.

POWER/VAC® INTERRUPTER

The POWER/VAC interrupter used in this breakeris a reliable, clean interrupting element. Since thecontacts are contained in a vacuum chamber, theyremain clean and require no maintenance at anytime. The metallic vapors eroded from the contactsurfaces during high current interruption remain inthe chamber and are deposited on metal shieldsthus insuring a high dielectric value of the vacuumand the walls of the interrupter.

TROUBLE REPORTING

Although all reputable manufacturers design theirproducts to perform satisfactorily with a minimumof problems, the IEEE Switchgear Committee, anorganization of both users and manufacturers, rec-

ognized the need for a common trouble reportingformat. A reproducible copy of this form is includedon pages 67 and 68 of this book and isrecommended for use with any manufacturer'scircuit breakers. Forward completed forms to GE atBurlington Iowa.

The intent is for each maintenance organization tokeep specific problem files with this informationdocumented. If the problem is serious or repetitive,a summary should be sent to the appropriatemanufacturer for action. The level of detailincluded on the form is considered very desirableso that the manufacturer's investigator may morethoroughly understand and solve the reportedproblem.

14.2. SERVICE CONDITIONSThe frequency of required maintenance dependson the severity of the service conditions of theswitch-gear application. If the service conditionsare mild, the interval between maintenanceoperations may be extended to 10 years or 10,000no load or 5000 for normal load switchingoperations.

Mild service conditions are defined as anenvironment in which the switchgear is protectedfrom the deleterious effects of conditions such as:

Salt spray.Changes in temperature that produce condensation, conductive and/or abrasivedust.Damaging chemicals and fumes.Vibration or mechanical shock.High relative humidity (90%).Temperature extremes (below -30º C or above +40º C).

WARNING: BEFORE ANY MAINTENANCEWORK IS PERFORMED, MAKE CERTAIN THATALL CONTROL CIRCUITS ARE DE-ENERGIZEDAND THAT THE BREAKER IS REMOVED FROMTHE METALCLAD UNIT. DO NOT WORK ONTHE BREAKER OR MECHANISM WHILE IT IS INTHE CLOSED POSITION WITHOUT TAKINGPRECAUTIONS TO PREVENT ACCIDENTALTRIPPING. DO NOT WORK ON THE BREAKERWHILE THE CLOSING SPRING IS CHARGEDUNLESS IT IS SECURED IN THAT POSITION BYTHE CLOSING-SPRING GAG.

14.3. FAULT INTERRUPTIONSThe erosion rate of the primary contacts in thevacuum interrupters is very low for no-load andnormal load switching operations. However, faultcurrent interruptions at or near the breaker ratingmay result in appreciable contact erosion. Withfrequent fault interruptions it is necessary to


GEH 6468A -Power/Vac VL Breaker Page 35

form maintenance based on the number ofinterruptions. After each 15 full fault interruptions thefollowing should be performed:

1. Contact erosion check.2. Wipe and gap check.3. Vacuum interrupter integrity test.

14.4. CONTACT EROSION

Check in the breaker-closed condition per PRIMARYCONTACT EROSION section 11.1. When erosionreaches 1/8 inch, the interrupter should be replaced.

14.5. TRANSFER FINGER WEAR

With breaker open, examine the moving contact rodprojecting below the transfer fingers (10, Fig. 22).Wipe off the lubricant in order to see the metalsurface condition. The finger locations should presenta burnished silver contact without copper appearanceat more than one location. If copper is visible at morethan one location per pole or the silver plating is torn,the interrupter assembly should be replaced.Relubricate with grease, part # 0282A2048P009(mobil 28 red grease).

14.6. MECHANISMCheck all items covered in INSTALLATION andreadjust or tighten hardware as required. Lubricate asrecommended under LUBRICATION.

14.7. PRIMARY INSULATION PARTSUsing dry, non-linting cloth or industrial-type wipers,clean accessible insulation surfaces on the interruptersupports and operating rod insulators. In servicelocations where contamination is heavy or externalflashovers, have occurred during interrupter high-potential testing, remove the interrupter assembliesper the procedure in REPAIR AND REPLACEMENTand clean the inside surfaces of the interruptersupports and the outer insulation surfaces of thePOWER/VAC interrupters.

Be sure to discharge the interrupter midband ringbefore removing the interrupter assemblies. Removaland reassembly of interrupter assemblies willnormally not require adjustment due to the design ofthe interrupter operating rod insulator connection.They should be returned to the same location fromwhich they were removed.

14.8. LUBRICATIONProper lubrication is important for maintaining reliablecircuit breaker performance. The ML-18VL mech-anism uses bearings which have a synthetic lining in

some locations. These bearings do not requirelubrication to maintain low friction, but lubricationdoes not harm them and oiling lightly isrecommended. Sleeve bearings are used in somelinkage locations and needle or roller bearings areused for low friction on trip shaft and close shaft.

Bearings are lubricated during factory assembly withgrease and oil, but all lubricants have a tendency todeteriorate with age. Providing a fresh lubricantsupply at periodic intervals is essential to properbreaker operation, especially where frequentoperation may have forced lubricant out of thebearing surfaces. Apply a few drops of lightsynthetic machine oil such as Mobil 1 at eachbearing. Apply a coat of 0282A2048P009 grease onthe four corners of the closing spring guide where itenters inside the spring. Metal-to-metal contactsurfaces should be cleaned and lubricated with0282A2048P009 grease to provide cleanliness andprevent oxidation.

Electrical primary contact surfaces also requireperiodic lubrication to inhibit oxidation and minimizefriction. At each inspection and maintenance interval,do the following:

1) Wipe clean and coat lightly with 0282A2048P009grease all silvered primary contact surfaces such asthe movable contact rod of the interrupter and theprimary disconnect fingers.

2) Clean and coat lightly with 0282A2048P009 greasethe pins of the secondary coupler.

14.9. RECOMMENDED MAINTENANCEThe following operations should be performed ateach maintenance check:

1. Perform a visual inspection of the breaker. Checkfor loose or damaged parts.

2. Perform slow closing operation described underMECHANICAL CHECKING AND SLOW CLOSING.

3. Check the erosion indicator and the wipe and gapas described under DIMENSIONAL CHECKS.

4. Perform the vacuum interrupter integrity test asdescribed under ELECTRICAL CHECKS.

5. Lubricate the breaker operating mechanism asdescribed under LUBRICATION.

6. Check the electrical operation using the testcabinet.



CAUTION: REPEATED OPERATIONS AT A RATEEXCEEDING TWO PER MINUTE MAY CAUSECHARGING MOTOR OVERHEATING ANDSUBSEQUENT MOTOR FAILURE.

7. Examine the movable contact rod of the vacuuminterrupter. With the breaker open, wipe the lubricantoff the rod and examine the silver surface. The rodshould have a burnished appearance without copperappearing through the silver. If copper is visible atmore than one location per pole, or if the silverplating is torn, the interrupter assembly should bereplaced. Relubricate breaker movable contact rodwith 0282A2048P009 grease.

8. If desired, perform the additional tests (Megger,Primary and Secondary High Potential, and PrimaryCircuit Resistance). See ELECTRICAL CHECKS.

15. TIMING

Timing and speed checks are optional and alsodepend on the level of maintenance performed.Generally these tests are not required for normalmaintenance. If a new mechanism has been installedor extensive repair, replacement or majordisassembly has been performed, it is recommendedthat these tests be performed.

To determine contact velocity, a travel recorder andoscillograph are required. Optional travel recorderscan be obtained through your local GE Sales Officeby ordering part number 0144Dl235G001. A typicaltravel trace and interpretation are shown in Fig. 29.

Timing may be checked by monitoring control circuitvoltage and using no more than six volts DC and oneampere through the vacuum interrupter contact toindicate closed or open condition. Typical timeranges vary with coil voltage, but nominal values are:

Initiation of trip signal to contact parting 32-45 Milliseconds

2 Milliseconds maximum pole spreadInitiation of close signal to contact closing 35-75 Milliseconds

2 Milliseconds maximum pole spread.

Trip-free operation may be checked by applying asimultaneous close and trip signal, and a minimumreclose operation may be checked by tripping acharged breaker open while maintaining a closesignal.

Instantaneous reclose time 85-150 Milliseconds. *Time from application of trip signal until breaker contacts reclose.

16. OPENING AND CLOSING SPEED

The opening speed is modified by moving the speedadjusting nuts on the opening spring assemblies. Achange in the opening speed affects the closingspeed Reference Figure 29.

The operating speeds for 5 cycle breakers are asfollows:Operation Feet Per SecondOpen 5.0 normal, 4.5 minimumClose 3.5 nominal, 4.0 maximum

17. REPAIR AND REPLACEMENT

17.1.GENERALThe following information covers in detail the propermethod of removing various parts of the breaker inorder to make any necessary repairs. This sectionincludes only those repairs that can be made at theinstallation site, or parts of the breaker that are mostsubject to damage.

Important: Upon completion of any kind of repairwork, all interrupter and mechanism adjustmentsmust be checked.

Refer as needed to sections on mechanical andelectrical adjustments.

17.2. REPLACEMENT OF INTERRUPTERASSEMBLIESInterrupter are supplied in complete interrupterassemblies which include the vacuum interruptermounted in the interrupter support, the primary studsand disconnect fingers.

CAUTION: DO NOT ATTEMPT TO REMOVE ORREINSERT THE VACUUM INTERRUPTER IN THEINTERRUPTER SUPPORT ASSEMBLY. SPECIALTOLLS AVAILABLE ONLY AT THE FACTORY AREREQUIRED.

1 . Remove the front portion of the breaker top plate.Close the breaker and remove the coupling clamp,(8, Fig. 22). Hold hex projection (6, Fig. 22) at thebottom of the operating rod insulator with a 1 inchwrench and loosen the adjacent lock nut with a 3/4inch wrench. Screw down the lock nut and theoperating rod insulator until clear of interrupter rod.Remove the four bolts holding the pole assembly tothe mechanism and remove the old pole assembly.

2. Set the new pole assembly in place and install thefour mounting bolts. Set the pole assembly so thatthe distance between the primary studs and the studson the adjacent pole are ten (10) inches center line tocenter line.



shaft, or loosen clamping bolt in operating link.Observe and make note of the direction of theindex mark on the end of the shaft and the positionof the operating link in relation to the stop screw.

Remove mounting hardware securing auxiliaryswitch to mechanism plate. Slide auxiliary switchand shaft out of operating link. Before removingany wires from switch terminals, make sure theyare properly tagged with switch terminal numbersto assure proper placement on new switch.Remove wires.

To install new switch, attach leads then installswitch, or install switch then attach leadsdepending upon type of switch and its terminalaccessibility. Install switch shaft in operating linkwith index mark aligned as noted above. Reverseabove procedure to complete installation.

17.9. MOTOR REPLACEMENTWith the breaker open and the closing springdischarged, remove auxiliary switch as describedabove but do not disconnect leads. Move switchtoward side of mechanism far enough to clearmotor and tie there temporarily. Disconnect motorleads. Remove the long bolt and spacer securingthe motor to the mechanism mid-plate. Removethe two socket head cap screws securing the motorto the mechanism top plate using a 5/16" Allensocket and a 24" extension. Disengage the motoroutput shaft from the charge linkage arms andwithdraw motor.

To install the new motor, reverse the aboveprocedure.

17.10. "Y" RELAY REPLACEMENTBefore removing the "Y" relay, make sure all leadsare marked with terminal locations. Next,disconnect all leads and remove the two fastenerssecuring the "Y" relay's shock absorbing mountingbracket to the mechanism rear plate. Withdrawrelay and bracket. Remove fasteners securingrelay to mounting bracket.

Reverse above procedure to install new relay.

18. RENEWAL PARTSIt is recommended that sufficient renewal parts becarried in stock to enable the prompt replacementof any worn, broken or damaged parts. A stock ofsuch parts minimizes service interruptions causedby breakdowns, and saves time and expense.When continuous operation is a primaryconsideration, more renewal parts should becarried, the amount depending upon the severity of

the service and the time required to securereplacements.

Renewal parts which are furnished may not beidentical to the original parts, but they will beinterchangeable.

A separate Renewal Parts Bulletin may beavailable from your local GE Sales office.

18.1. ORDERING INSTRUCTIONS

1. Always specify the complete nameplate date ofboth the breaker and the mechanism.

2. Specify the quantity, catalog number (if listed),reference number (if listed), and description ofeach part ordered, and the parts bulletin number.

3. Standard hardware, such as screws, bolts, nuts,washers, etc. are not listed in this bulletin. Suchitems should be purchased locally.

4. For prices or information on parts not listed inthe Renewal Parts Bulletin, refer to the nearest GEoffice.

19. MECHANICAL ADJUSTMENTS

19.1 GENERAL

The ML-18VL Mechanism has been designed forextended intervals between maintenance. In mostcases only the wipe and gap adjustments willrequire re-setting throughout the life of the circuitbreaker.

19.2. WIPE ADJUSTMENT

Wipe is the additional compression of a preloadedspring, used to apply force to the vacuuminterrupter contacts and to provide opening kick-offforce. Always adjust the contact wipe beforeadjusting the gap.

An indicator is provided on the wipe springassembly with graduations given in 0.05 inch onwhich the wipe is indicated directly. See Figure 22.

Improved accuracy of the wipe measurement maybe obtained by using a feeler gauge between thetop of the wipe indicator and the erosion disk. Thedifference in readings on each pole with thebreaker closed and open is the contact wipe.Adjustment not required if wipe is more than 0.075inch. After adjustment the wipe should be 0.15-0.18 inch.



To adjust the primary contact wipe, close thebreaker. Remove the front portion of the breakertop plate, (do not remove the entire top plateassembly) and proceed as follows:

1. Loosen, but do not remove, the two cap screws(9, Fig. 22) holding the interrupter clamp.

2. Check that the interrupter clamp is loose. A lightpry at the clamp half junction may be required toloosen the wedging action of the clamp.

3. Hold the hexagon projection (6, Fig. 22) at thebottom of the operating rod insulator (1 inchwrench) and loosen the adjacent locknut (4, Fig.22), with (3/4 inch wrench). Adjust by rotating theoperating rod insulator. The thread is 1/2-13 andeach turn will give about 0.078 inch change inprimary wipe. Screw the operating rod insulatortoward the interrupter to increase wipe.

4. After setting the contact wipe on each phase,torque the operating rod locknut (4, Fig. 22) to 40-50 foot pounds while holding the hex projection (6)to prevent the operating rod insulator (7) fromturning. Tighten the clamp screws (9) to 8-10 footpounds and trip the breaker open. This procedureprevents accidental twisting of the interrupter'soperating rod by loading the contacts with the wipesprings and forcing relative rotation to occur at theclamp interface. After adjustment, remeasure thewipe dimensions. If the wipe settings are within therequired limits, there is an adequate contactclosing relationship between the poles.

19.3. CONTACT GAP ADJUSTMENTTo adjust the contact gap, remove the front portionof the breaker top plate. The gap adjustment refersto the separation, or gap, between the primarycontacts within the vacuum interrupter. Beforeattempting to measure or set the gap adjustment,verify that the wipe settings are within acceptablelimits. Any change of the wipe settings will affectthe gap settings.

1. With the breaker in the open position and theclosing spring discharged, locate the gap adjustingnuts on the opening spring rods connected to theouter phase bell cranks (Fig. 27). Loosen the jamnut on both rods. Back off the adjusting bolt on thecenter phase VI stop (Fig. 27).

2. Advance or retard the adjusting nuts dependingon which way you want to change the gap. Moveboth nuts the same amount.

3. Lock the jam nuts after setting the adjustingnuts. Operate the breaker a few times andremeasure the gap following the proceduredescribed in DIMENSIONAL CHECKS, item 3.

Readjust the center phase VI stop (Figure 27). Setadjusting screw for no clearance between stop andwipe spring rod striker with the breaker open.

19.4. TRIP COIL PLUNGER

To adjust trip coil plunger gap (Figure 32), liftlocktab away from adjusting nut. Turn adjusting nutuntil trip pin makes contact with trip arm whilemaintaining dimension T. Bend locktab to securethe adjusting nut.

Reference DIMENSIONAL CHECKS for breakerposition and spring status.

19.5. CLOSE COIL PLUNGER

To adjust close coil plunger gap (Figure 30), liftlocktab away from adjusting nut. Turn adjusting nutuntil close latch actuator makes contact with closelatch while maintaining dimension C. Bend locktabto secure adjusting nut.

Reference DIMENSIONAL CHECKS for breakerposition and spring status.

19.6. CLOSE SPRING DISCHARGEINTERLOCK

THIS INTERLOCK IS FACTORY SET ANDSHOULD NOT BE ROUTINELY ADJUSTED INTHE FIELD. The adjustment for this interlock is asfollows. (See Fig. 25).

The breaker should be open with the closing springcharged.

1. Back off 1/4 inch linkage adjusting screw.

2. While holding roller at 0.995 inch dim., advanceadjusting screw to just touch interlock lever.

3. Close latch must reset as indicated.

19.7. POSITIVE INTERLOCK

THIS INTERLOCK IS FACTORY-SET ANDSHOULD NOT BE ROUTINELY ADJUSTED INTHE FIELD.



TABLE OF MEASUREMENTS

ITEM BREAKER CL SPRING OP SPRING MEASUREMENT

ContactWipe

OpenClosed

ChargedCharged

DischargedCharged

Measure between erosion diskand wipe indicator.

ContactGap

OpenClosed

ChargedCharged

DischargedCharged

Measure the travel of theoperating rod insulator.

ContactErosion

Closed Discharged Charged Measure between erosion diskand reference arm.

Trip Coil Closed Discharged Charged Measure between plungerbutton and coil housing.

Close Coil Open Charged Discharged Measure between plungerbutton and coil housing

ControlSwitches

Open Discharged Discharged Depends on switch typeSee Section 8.6.

Timing See Section 12.ContactSpeeds

See Section 13.

TABLE OF ADJUSTMENTS

ITEM BREAKER CL SPRING OP SPRING MEASUREMENT

ContactWipe

Closed Charged Charged Adjust operating rod to obtainrequired dimensions.

ContactGap

Open Charged Discharged Advance or retard gap adjustingnuts to set gap.

ContactErosion

Closed Discharged Charged Align Reference arm with disk onnew units only.

Trip Coil Closed Discharged Charged Turn adjusting nut to obtainrequired dimension.

Close Coil Open Charged Discharged Turn adjusting nut to obtainrequired dimensions.

ControlSwitches

Open Discharged Discharged Adjust mounting bracket toobtain required dimension.

OvertravelStop

Open Discharged Discharged See Section 16.3 for adjustment.



FIGURE 16FRONT VIEW OF POWER/VAC VL BREAKER

WITH FRONT COVER

1 - Nameplate 7 - Counter2 - Cover Counting Bolts 8 - Manual Trip Button3 - Front Cover 9 - Manual Close Button4 - Open/Close Indicator 10 - Manual Charge Slot5 - Close Spring Gag Access 11 - Secondary Coupler6 - Charge/Discharge Indicator 12 - Positive Interlock Roller



FIGURE 17FRONT VIEW OF POWER/VAC VL BREAKER

WITH FRONT COVER REMOVED

1 - Secondary Coupler 9 - Opening Spring2 - Plunger Interlock 10 - Positive Interlock Roller3 - Spring Discharge Lever 11 -

GE Po werVac VL · 2020. 10. 12. · g GEH-6468A Instructions GE Po werVac ® VL Vacuum Circuit...

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Transcript of GE Po werVac VL · 2020. 10. 12. · g GEH-6468A Instructions GE Po werVac ® VL Vacuum Circuit...