VHK Model 05 {6-2-7-7-1I} vacuum power circuit breakers. ... transmitted light is usually required...

IB 6.2.7.7-1IRev. 0, Jan-99

I N S T A L L A T I O N / M A I N T E N A N C E I N S T R U C T I O N S

Medium VoltageVacuum Power Circuit Breakers

VHK Model 05

VHKR Model 81/82

VHKX Model 05

1200, 2000 and 3000 Amperes

Model 05C/05D/81/82

ABB Power T&D Company, Inc.Distribution Systems Division

MODEL 05D MODEL 05C

IB 6.2.7.7-1I2

TABLE OF CONTENTS

INTRODUCTION ........................................................................................................... 4

RECEIVING AND STORAGE........................................................................................ 4

INSTALLATION............................................................................................................. 4

GENERAL.................................................................................................................... 4GENERAL INSPECTION................................................................................................. 5VACUUM INTERRUPTER EXAMINATION .......................................................................... 5BARRIER AND INSULATION INSPECTION ........................................................................ 5INSTALLING FRONT BARRIER ....................................................................................... 5MANUAL OPERATION FOR INSPECTION......................................................................... 5PADLOCK PROVISION .................................................................................................. 6INTERLOCKS ............................................................................................................... 6INSTALLING CIRCUIT BREAKER INTO COMPARTMENT .................................................... 8

CIRCUIT BREAKER REMOVAL................................................................................... 9

REMOVAL FROM CONNECT POSITION ....................................................................... 9REMOVAL FROM TEST POSITION................................................................................ 9REMOVAL FROM DISCONNECT POSITION ................................................................. 9SAFE OPERATIONS RECOMMENDATIONS ...................................................................... 9

ADJUSTMENTS, TESTS AND PERIODIC MAINTENANCE........................................ 9

INSULATION CLEANING .............................................................................................. 10DC MILLIVOLT DROP TEST / MICRO-OHM TEST.......................................................... 10CONTACT WEAR AND CONTACT PRESSURE................................................................ 10CONTACT GAP .......................................................................................................... 11CONTACT GAP CHECK - MODEL 05D/81/82............................................................... 11CONTACT GAP CHECK - MODEL 05C......................................................................... 11CONTACT SEQUENCING............................................................................................. 12CLOSING AND OPENING TIMES .................................................................................. 12CLOSING AND OPENING SPEEDS................................................................................ 13LATCH CHECK SWITCH.............................................................................................. 13LUBRICATION ............................................................................................................ 13DIELECTRIC TESTS.................................................................................................... 14

ELECTRICAL CHARACTERISTICS OF CONTROL DEVICES ................................. 15

DC AND AC CLOSING OPERATING SEQUENCE ........................................................... 15AC CLOSING OPERATING SEQUENCE ........................................................................ 16

GROUND AND TEST DEVICES ................................................................................. 17

RENEWAL PARTS...................................................................................................... 17

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TABLE OF CONTENTS (CONTINUED)

APPENDIX

FIGURE A1 - CIRCUIT BREAKER ASSEMBLY WITH LIFTING YOKE INSTALLED.............. 18FIGURE A2 - FRONT CIRCUIT BREAKER PANEL ......................................................... 19FIGURE A3 - RACKING MECHANISM.......................................................................... 20FIGURE A4 - INTERLOCK SYSTEM............................................................................. 21FIGURE A5 - METHOD OF RACKING CIRCUIT BREAKER ............................................. 22FIGURE A6 - CONTACT WIPE & GAP MEASUREMENT (MODEL 05D/81/82) ................ 23FIGURE A7 - CONTACT WIPE & GAP MEASUREMENT (MODEL 05C) .......................... 24FIGURE A8 - TRIP LATCH CHECK SWITCH ADJUSTMENT............................................ 25FIGURE A9 - CONTROL RELAY ................................................................................. 26FIGURE A10 - TYPICAL DC SCHEMATIC OF CONTROL CIRCUIT ................................... 27FIGURE A11 - TYPICAL AC SCHEMATIC OF CONTROL CIRCUIT ................................... 28TABLE A1 - CONTROL CIRCUIT OPERATING VOLTAGE RANGE.................................. 29TABLE A2 - CONTROL CIRCUIT TYPICAL CURRENT VALUES ..................................... 29TABLE A3 - VHK OPERATING PARAMETERS ........................................................... 30

These instructions do not purport to cover all details or variations nor to provide for every possiblecontingency 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 purpose the matter should be referred to the nearest District Office.

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INTRODUCTION

This manual contains instructions for inspection,application, installation, operation, testing,adjustment and maintenance of all VHK Model05/81/82 vacuum power circuit breakers. Use ofthese instructions will facilitate proper applicationand maintenance of the circuit breaker, andprolong its life and usefulness.

Throughout this manual, there are three terms thatmust be heeded.

CAUTIONNot adhering to these instructions can result indamage to the breaker.

WARNINGNot adhering to these instructions can result inpersonal injury or DEATH, and damage to thebreaker.

DANGERNot adhering to these instructions will result inpersonal injury or DEATH, and permanent damageto the breaker and other equipment.

RECEIVING AND STORAGE

Immediately upon receipt of the circuit breaker,examine it to determine if any damage or loss wassustained during transit. If abuse or incorrecthandling is evident, file a damage claim at oncewith the carrier, and promptly notify the nearestDistrict Office. The company is not responsible fordamage of goods after delivery to the carrier. Wewill, however, lend assistance if notified of claims.

Unpack the circuit breaker as soon as possibleafter receipt. If unpacking is delayed, difficultymay be experienced in making a claim fordamages not evident upon receipt. Use careduring unpacking in order to avoid damaging anyof the circuit breaker parts. Check the contents ofeach device against the packing list beforediscarding any packing material. If any shortageof material is discovered, promptly notify thenearest District Office. Information specifying the

purchase order number, device serial numbersand part numbers of the damaged or missingparts should accompany the claim.

The circuit breaker should be installed in itspermanent location as soon as possible. If thebreaker is not to placed into service for some time,it is advisable to provide some means ofprotection. This may be done by keeping thebreaker in its original shipping crate, and storing ina warm, dry, uncontaminated atmosphere. If thebreaker cannot be stored properly due tocircumstances beyond your control, it must bethoroughly checked before being put into service.This is to insure that it has not absorbed anymoisture, or has become rusted or generallycontaminated in any way.

INSTALLATION

General

Prior to installation of the circuit breaker into thecompartment, certain preliminary inspectionsshould be made to insure proper operation. Thissection lists the recommended inspectionprocedures.

ABB VHK Vacuum Circuit Breakers are shippedwith the contacts closed, closing springsdischarged and opening springs charged. This isto protect against the possibility of the contactsstriking the inside of the vacuum interrupterenclosure and damaging themselves duringshipping.

WARNINGPrior to any disassembly or inspection of the circuitbreaker, the closing springs must be discharged,and the breaker should be open. Failing to do socould result in personal injury.

If the circuit breaker is equipped with anUndervoltage Trip Device (a.k.a. UVTD), theretaining strap applied to the UVTD at the factorymust be removed. The retaining strap wasapplied to hold the Armature of the UVTD in theenergized position so the breaker could be closed.If the Retaining Strap is not removed, the UVTDwill not be able to trip the breaker.

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Refer to Figure A1 in the Appendix. If it isnecessary to raise or move the breaker, attach alifting yoke (4) at points (3) on both sides of thetruck, or a fifth wheel accessory at point (5) totransport the breaker as required.

General Inspection

Inspect the condition of the circuit breaker vacuuminterrupters and electrical connections prior toinstalling the circuit breaker into the compartment.Even though each circuit breaker is completelyadjusted and tested at the factory, shipping andhandling conditions, and/or incorrect storage couldcause defects.

The Front Cover and Lexan Interphase Barrierassembly (2, Figure A1) must be removed foraccess to and inspection of the vacuuminterrupters and their associated adjustments.

Vacuum Interrupter Examination

WARNINGIf the circuit breaker has been energized, or it isunsure if the circuit breaker has ever beenenergized, the mid-band ring (on vacuuminterrupters so equipped) must first be dischargedbefore any work is performed on or near theinterrupters. A grounding stick must be used todischarge the ring by fastening the ground cable ofthe stick to a known ground and touching thegrounding tip of the stick to each mid-band ring.

The insulated vacuum container should beexamined carefully for cracks in the area of themetal-to-insulation interface seals on both endsand around the Mid-Band Ring. See Figure A6 inthe Appendix. Since a certain amount oftransmitted light is usually required to detectcracks, the inspection should be done in a welllighted area. If the mid-band ring, when soequipped, has been bent by accidental impact,that area should be specially scrutinized for sealdamage. Small external chips will not impair theuseful life of the interrupter.

Barrier and Insulation Inspection

All barriers and insulated parts should be checkedfor damage. Any dust or dirt should be removedby compressed air or with a clean, lint-free cloth.

If these parts have become contaminated with anyheavy dirt or grease, a clean, lintless clothsaturated with alcohol should be used.

The lead support moldings are polyester glass andoccasionally have some resin rich cracks orcrazing develop. These do not indicate defectivematerial and should not cause concern.

Installing Front Barrier

Install the assembly with eight mounting screws.Refer to Figure A1 in the Appendix.

Note: It is recommended that a dielectricwithstand test be performed prior to initially puttingthis or any type vacuum circuit breaker intoservice. Refer to "Dielectric Tests" in the"Adjustments, Tests and Periodic Maintenance"section for the correct test procedure.

Manual Operation For Inspection

The electrically operated circuit breakers can becharged manually with a removable ManualCharge Handle for bench tests or emergencyoperation. The removable Manual Charge Handleis an accessory, and is supplied only whenordered.

Position the Manual Charge Handle onto theManual Charging Lever. See Figure A2 in theAppendix. Push down on the manual closinghandle until it will not travel any further. Thispartially charges the closing springs. Repeat thisoperation until the charging mechanism is heard tosnap over center (approximately 10 operations),and the Spring Indicator clearly shows themessage SPRINGS CHARGED. The circuitbreaker can now be closed by pulling out on theManual Close Lever. The circuit breaker can thenbe opened by pressing the Manual Trip Button.

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Padlock Provision

Refer to Figure A3 in the Appendix.The Racking Mechanism Padlock Hasp provisionpermits the breaker to be padlocked in theDISCONNECT and TEST positions. Thisprovision is accomplished by the Padlock Haspblocking the Blocking Lever attached to theRacking Release Assembly, preventing the RackScrew from being rotated clockwise to the releaseposition. If not functioning properly, the AdjustableLink must be adjusted as follows. Remove thelower Front Panel of the breaker.

1. Remove the Retaining Ring from one of

the pins securing the Adjustable Link. 2. Rotate the free end of the Adjustable Link

to vary its length, so that whenreconnected to the pin, the padlockfunctions as noted above.

3. Replace the Retainer. 4. This adjustment might effect feature "D" of

the "Interlocks (Racking Mechanism)",below, and it should be checked also.

NOTE: As a special option, the breaker may beordered with Three-Position Padlocking, whichalso permits the breaker to be padlocked in theCONNECT position.

Interlocks (Racking Mechanism)

The four mechanical interlocks that work inconjunction with the Racking Mechanism toprotect both user and breaker should function asspecified below. If malfunction is identified andthe recommended adjustments do not correct theproblems, consult the factory before placing thebreaker in service.

Refer to the next sections, "Installing CircuitBreaker Into Compartment" and "Removing CircuitBreaker," for a complete description of theRacking Mechanism components and operation.

A. When in the WITHDRAW position, theClosing Springs will discharge automatically.If the Closing Springs have been previouslycharged, they will discharge when the rackingmechanism reaches this position. This isaccomplished with a linkage, activated by ashimmed adjusting screw on a tab at thecenter of the Rack Shaft, which pulls theClose Latch to its unlatched position. If theinterlock does not function as specified, adjustas follows:

1. Make sure Racking Mechanism is in theDISCONNECT position.

2. Following the instructions in "Removal

from DISCONNECT Position," rotate theRack Screw counterclockwise. TheManual Close Lever should begin movingafter one-half (1/2) turn from theDISCONNECT position.

3. If the Manual Close Lever requires more

than one-half (1/2) turn to begin moving,an extra shim washer needs to be added.If it begins to move before one-half (1/2)turn, a shim washer needs to be removed.

NOTE: See Figure A4 for the location of theAdjusting Srew to be shimmed referred to inStep 4 4. To add or remove shim washers, position

the Racking Mechanism in the CONNECTposition. Remove the nut securing thescrew and shim washers, add or subtractone shim washer, reassemble and retest.

B. The Rack Screw cannot be turned to move the

breaker from the DISCONNECT, TEST andCONNECT positions unless the ReleaseLever is first operated. A finger in the IndexLever engages one of three holes in the RackScrew corresponding to each of the previouslymentioned positions, preventing it fromrotating. Turning the Release Lever to the leftdisengages the finger from the hole, allowingthe Rack Screw to be rotated.

1. If the Rack Screw can be rotated withoutturning the Release Lever, check if theRelease Lever is jammed in the left

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(release) position. If so, see if it can befreed.

2. Visually inspect that the finger of the Index

Lever is engaging in the correspondinginterlock hole in the Rack Screw.

NOTE: If the Release Lever cannot be turned tothe left, make sure breaker is first in the Openposition.

C. The Release Lever cannot be operated whenthe breaker is in the closed position. Thisprevents connecting or disconnecting thebreaker from the Primary Stabs in thecompartment with the breaker closed. ARacking Lock Bracket, operated by thebreaker’s Jackshaft, blocks the Index Leverwhen the Jackshaft is in the closed position. Ifthe interlock is not functioning as noted,perform the following inspections. Refer toFigures A3 and A4 in the Appendix.

1. Check that the Racking Lock Bracket isconnected to the Jackshaft via a Link. Ifnot, reconnect.

NOTE: The Operations Counter and theOpen/Closed Indicator are also driven by thesame Racking Lock Bracket.

2. Check that nothing in the Racking

Mechanism is bent.

D. When the circuit breaker is between theWITHDRAW, DISCONNECT, TEST andCONNECT positions, any attempt to close thebreaker will discharge the Closing Springs,and the contacts will not close. This is referredto as "Trip Free" operation. The finger of theIndex Lever rides on the circumference of theRack Screw, holding the Release Lever in itsrelease position. A linkage between theRelease Lever and Trip Latch holds the TripLatch in its unlatched position. If this interlockis not functioning as noted, perform thefollowing:

1. Confirm that the Trip Latches are properlyadjusted and functioning. Position theRack Screw so the Rack Mechanism is inthe DISCONNECT, TEST or CONNECT

position. Charge and Close the breaker,and then press the Manual Trip Button.

NOTE: If the breaker does not trip, the TripLatch and/or linkage is at fault. Contact theCustomer Service Center for assistance. If the breaker does trip properly, theAdjustable Link must be readjusted per thefollowing steps: 2. Charge and close the breaker. The gap

between the L-shaped Blocking LeverExtension and the Trip Lever typically isbetween 0.03" - 0.09" (0.8 - 2.4mm). SeeFigure A3 in the Appendix.

3. Remove the Retaining Ring from one of

the two pins securing the Adjustable Link,and disconnect the Adjustable Link fromthat pin.

4. Rotate the free end of the Adjustable Link

one-half (½) turn to increase its length.This will advance the trip linkage.

5. Reconnect the Adjustable Link to the pin

and retest. 6. If the breaker does not trip when

reconnecting the Adjustable Link, repeatsteps (4), (5) and (6) above.

If the breaker does trip when connecting thetrip link, one final adjustment is necessary.Remove the link and rotate the free end of theAdjustable Link one (1) turn to decrease itslength. This will retard the trip linkage,allowing the breaker to close when theRacking Mechanism is in the DISCONNECT,TEST or CONNECT position. 7. The interlock should now be properly

adjusted. Confirm by retesting theinterlock.

8. If the interlock is now functioning properly,

replace the retainer removed in step 2.

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Installing Circuit Breaker IntoCompartment (See Figure A5 in theAppendix) NOTE: CLOCKWISE rotation of racking crankfor inserting breaker. COUNTERCLOCKWISErotation of racking crank for removal of breaker. 1. Turn Motor Disconnect Switch (if so equipped)

to the OFF position. Refer to Figure A2 in theAppendix.

NOTE: Step 2 is possible only if RackingMechanism is in CONNECT, TEST orDISCONNECT positions, and the breaker isOpen)

2. Make sure the Racking Mechanism is in theWITHDRAW position. This can be done byfirst turning the Release Lever to the left.While holding the Release Lever to the left,engage the Racking Crank (accessory) intothe Rack Screw and rotate crankcounterclockwise until a definite resistance isfelt (Do Not Force).

NOTE: If the Index Lever is observed (and/orheard, by a "click" sound) to instead engage inone of the holes of the Rack Screw, causing theRelease Lever to turn back counterclockwise, theRacking Mechanism is still not in theWITHDRAW position. Step 2 must be repeated.

NOTE: If the Closing Springs were previouslycharged, they will automatically discharge whenthe Racking Mechanism reaches theWITHDRAW position.

3. Engage the Fifth Wheel accessory into theHole Guide in the breaker’s truck. See FigureA2 in the Appendix. Push the circuit breakerinto the switchgear compartment until adefinite stop is felt. This stop is the rollers ofthe breaker’s Racking Arms hitting the backedge of the Racking Ports of thecompartment.

4. Turn the Release Lever to the left, engage

Racking Crank into the Rack Screw, androtate Crank clockwise until rackingmechanism automatically stops at theDISCONNECT position. The breaker is now

held captive in the compartment by the rollersof the Racking Arms and the Racking Ports ofthe compartment.

5. To rack the circuit breaker to TEST position,turn the Release Lever to the left, turn Crankclockwise ¼-turn, release the Release Lever;it will remain in the released position.Continue cranking clockwise until the rackingmechanism automatically stops at the TESTposition.

6. With the circuit breaker now in the TESTposition, turn the Motor Disconnect Switch tothe ON position to electrically charge theClosing Springs. If a Motor Disconnect Switchwas not provided, the Closing Springs willautomatically charge when the breakerapproaches the TEST position.

Check for proper operation by closing and opening(tripping) the circuit breaker both electrically andmechanically, by all possible means. Thisincludes control switches, relays, etc.

WARNINGFor safety, when racking the circuit breaker "to" or"from" the CONNECT position, the compartmentdoor must be closed, and the racking crankinserted through the opening provided in thecompartment door.

7. To rack circuit breaker to the CONNECTposition, close the compartment door, andreinsert the crank into the Rack Screw via theAccess Door in the compartment door. SeeFigure A5.

8. Turn the Release Lever to the left, rotate Crank

counter clockwise ¼-turn, and then release theRelease Lever. It will remain in the releasedposition. Continue cranking clockwise until theRacking Mechanism automatically stops at theCONNECT position.

CAUTIONDo not attempt to rack circuit breaker any further,damage to the racking mechanism may result.

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CIRCUIT BREAKER REMOVAL

WARNINGFor safety, when racking the circuit breaker "to" or"from" the CONNECT position, the compartmentdoor must be closed, and the racking crankinserted through the opening provided in thecompartment door.

Removal From CONNECT Position

1. Open Access Door in the front compartmentdoor, and engage Racking Crank into theRack Screw. See Figure A5.

2. Turn the Release Lever to the left, rotate

Crank counterclockwise ¼-turn, and thenrelease the Rack Release Lever. It will remainin the released position. Continue rotating thecrank counterclockwise until the RackingMechanism automatically stops at the TESTposition.

Removal From TEST Position

1. Turn the Release Lever to the left, rotateCrank counterclockwise ¼-turn, and thenrelease the Release Lever. It will remain inthe released position. Continue rotating thecrank counterclockwise until the RackingMechanism automatically stops at theDISCONNECT position.

Removal From DISCONNECT Position

1. Push the Rack Release Lever clockwise, andturn Crank counterclockwise ¼-turn, and thenrelease the Rack Release Lever. It will remainin the released position. Continue crankingcounterclockwise until a resistance is felt(approximately 2-3 turns) (Do Not Force) Thebreaker is now in the WITHDRAW position.

If the Closing Springs were previouslycharged, they will automatically discharge asthe Racking Mechanism reaches theWITHDRAW position.

2. The circuit breaker can now be removed from

the compartment by pulling on the handlelocated on the Front Barrier.

Safe Operations Recommendations

It is recommended that any circuit breaker bewithdrawn and stored in the withdrawn positionwhenever it is to be maintained in the Openposition with no planned switching.

It is recommended that a Ground & Test Device(a.k.a. G&T Device) be connected to the propercompartment when any work is to be done on anybus or feeder circuit. See section "Ground andTest Devices" for a description.

ADJUSTMENTS, TESTS ANDPERIODIC MAINTENANCE

The circuit breakers are designed and tested toinsure minimum maintenance. The fewadjustments that are noted are required only whenan operational check indicates a problem. Ofcourse, during the maintenance checks, allaccessible bolts, units and screws should beroutinely checked to insure that they are tight.

It is recommended that the circuit breaker beinspected after the first 1000 operations and on ayearly basis unless environmental considerationsand operating experience indicate that more orless frequent inspections are appropriate. Theseoperations can be no-load mechanical, loadcurrent switching, bulk capacitor, reactor switchingoperations, or motor starting applications.

Vacuum interrupters, as used on the VHK vacuumcircuit breakers, have an inherently long contactlife and will provide trouble-free service undervaried application conditions as long as the circuitbreaker is applied within its rating. Theinterrupters have been tested up to 2000% KSIminimum. It is unlikely that a circuit breaker willbe subjected to this much duty in its life, and it isnot expected that the interrupters will have to bereplaced due to excessive contact erosion.

The wear condition of the individual vacuuminterrupters will vary, however, depending oncircuit conditions and such variables as singlephase versus three-phase interruption, X/R ratio

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(asymmetry) and relay delay times. Therefore, theinterrupters in all three phases may not erodeequally. Additionally, interrupting high short-circuitcurrent will cause contact erosion to occur fasterthan load current interruptions.

There is, however, a check for Contact Wipe(Contact Spring over-travel), which is a measureof contact erosion. This check is covered underthe subsection "Contact Wear and ContactPressure (Contact Wipe) ". When contact wipe isless then the minimum specified and there is notany mechanical problem, the interrupter should bereplaced due to contact erosion.

If, after the first inspection period, there is noindication of any problems, actual operatingexperience with specific circuits will indicate thefuture amount of maintenance needed for thevarious circuit breakers, and the procedure can bemodified as required.

Where unusual service conditions exist, ascovered by ANSI Standard C37.04, it must bepresumed that these conditions were consideredat the time of order, the equipment supplied wasdesigned for special application, and anappropriate supplemental maintenance programhas been developed. These maintenanceinstructions only cover circuit breakers used underthe standard service conditions.

At the selected maintenance period, the followingmaintenance, tests and adjustments (if necessary)should be made:

Insulation Cleaning

WARNINGIf the circuit breaker has been energized, or it isunsure if the circuit breaker has ever beenenergized, the mid-band ring (on vacuuminterrupters so equipped) must first be dischargedbefore any work is performed on or near theinterrupters. A grounding stick must be used todischarge the ring by fastening the ground cable ofthe stick to a known ground, and touching thegrounding tip of the stick to each mid-band ring.

Any dirt, dust or grease should be removed fromthe surfaces of the entire current carrying structureand vacuum interrupter. Wiping the surface with a

clean, lint-free cloth is normally sufficient. If thereis heavy grease, alcohol should be used.

DC Millivolt Drop Test / Micro-ohm Test

During maintenance periods, the condition of thebreaker current circuit can easily be determined byperforming a Millivolt drop test or a micro-ohmtest. This test should be performed regardless ofwhether the circuit breaker had interrupted low orhigh currents, or has minimum operations.

NOTE: The values for resistance, given in TableA3, are for new breakers. It is normal andacceptable for a used breaker to have resistancevalues as much as 100% greater than thesevalues.

Refer to Table A3 in the Appendix for the Millivoltdrop and resistance values for the circuit breakerscovered, from lead to lead. If the PrimaryDisconnects (a.k.a., Tulips) are to be included inthe test path, a 2.000” ± 0.005" diameter smooth(62rms) copper conductor (2.750” ± 0.005” for3000A breakers) must be inserted into the openend of each Primary Disconnect to achieve theproper contact pressure.

Contact Wear and Contact Pressure(Contact Wipe)

The amount of contact wear, and subsequentlycontact pressure (force), can be determined bymeasuring what is referred to as contact wipe (orover-travel). This can be accomplished by closingthe breaker and carefully measuring the gapbetween the Nut and the Trunion Block of theContact Spring Assembly. See Figures A6 and A7located in the Appendix for the different breakers.See Figure A4 for the Wipe Measurement Portlocation.

WARNINGKeep hands clear of all moving parts. Seriousinjuries can result if a person comes in contact withbreaker parts when the breaker is being opened orclosed, or closing springs are being charged ordischarged. Use extension tools for manipulatingbreaker parts.

This adjustment is initially set at the factory to arange of 0.145" - 0.219" (3.7 - 5.6mm). As the

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breaker sees service and the contacts start toerode, this value will decrease. Asymmetrical andsingle phase interruption will cause contacterosion and wipe deterioration to occur differentlyfor all three poles. Once the Wipe has decreasedto 0.031", and it is determined that the breaker isoperating properly, the interrupter assembly willneed replacement.

Contact Gap

Upon opening the breaker, the resulting gapbetween the vacuum interrupter contacts isreferred to as Contact Gap. This gap is also thedistance the contacts travel upon closing. Thiscan range from a minimum of 0.315 " (8mm) on anew breaker, to a maximum of 0.540" (13.5mm)on a used breaker with an interrupter nearingreplacement. As the breaker sees service and thecontacts start to erode, this value will increase.

The following procedure describes how todetermine the Contact Gap. The necessary toolsare a pen or pencil, and one piece of maskingtape at least 1" long. Proceed with the circuitbreaker withdrawn from the compartment.

WARNINGIf the circuit breaker has been energized, or it isunsure if the circuit breaker has ever beenenergized, the mid-band ring (on vacuuminterrupters so equipped) must first be dischargedbefore any work is performed on or near theinterrupters. A grounding stick must be used todischarge the ring by fastening the ground cable ofthe stick to known ground, and touching thegrounding tip of the stick to each mid-band ring.

Contact Gap Check- Model 05D/81/82

1. Open the breaker and discharge the closingsprings. See Figure A6.

2. The Racking Mechanism must be in either the

DISCONNECT, TEST or CONNECT position. 3. Using a pencil, apply a mark on the Pushrod

Stem at the interface between the Stem andStem Guide.

4. Manually charge closing springs and close the

breaker.

5. Using a pencil, apply a second mark on thePushrod Stem at the interface between theStem and Stem Guide.

The distance measured between the two lines isthe contact gap. The acceptable limits are listedin Table A3, located in the appendix.

Contact Gap Check- Model 05C

1. Open the breaker and discharge the closingsprings.

2. The Racking Mechanism must be in either the

DISCONNECT, TEST or CONNECT position. 3. Apply a piece of masking tape to the inside

surface of the molded interrupter support.See Figure A7 in the Appendix.

4. Lay a pen or pencil flat upon the push rod skirt

and draw a horizontal line on the tape. 5. Manually charge closing springs and close the

breaker. 6. Lay the pen or pencil flat upon the pushrod

skirt, and draw a second horizontal line on thetape.

7. The distance measured between the two lines

is the contact gap. The acceptable limits arelisted in Table A3, located in the Appendix.

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Contact Sequencing (Synchronization)

Before checking contact sequence, verify that thecontact wipe and gap for each pole is correct.Refer to the subsections "Contact Wear andContact Pressure (Contact Wipe)" and "ContactGap". It is not expected that the contact sequenceshould exceed the 4 millisecond limit, therefore,before attempting to readjust, verify that the testequipment and procedure are correct. Alsoconsider, especially when testing with electronicequipment, that multiple 2 millisecond vacuuminterrupter contact bounces are permissible duringnormal closing, and these bounces can influencethe contact time measurements. If there are anyquestions, consult the factory.

If it is determined that the contact sequence is notwithin 4 milliseconds, adjustment is required.Usually, readjustment of one pole should besufficient so that all three poles touch within 4milliseconds. The gap of the pole to be changedshould be decreased if the contacts of that poleare touching after the other two poles, orincreased if the contacts are touching before theother two poles. The gap is decreased by turningthe Pushrod clockwise, and increased by turningthe Pushrod counterclockwise, as viewed from thetop of the breaker.


Before the Pushrod can be turned, the breakermust be in the Open position, Closing Springsdischarged and the Pushrod Pin removed. SeeFigure A6 in the Appendix. With the breakerOpen, the vacuum in the interrupter maintains aconstant upward force of approximately 25 poundson the moving contact and Pushrod. Therefore,before removing pin, the contact must be helddown in the open position by temporary spacers.After removing the Retaining Ring and PushrodPin, rotate Pushrod as required.

One quarter (¼)-turn of the Pushrod will changethe gap by approximately 0.019" (0.5mm). Afterrotating the pushrod, carefully reposition it

vertically to align the holes and the stud. Replacethe pin and retainer and remove the temporaryspacer. During the readjustment procedure, notethat the contact wipe and contact gap dimensionsmust be maintained. The contact gap and contactwipe are inversely related; increasing onedecreases the other, and vise-versa. Also, notethat no more than one half (½)-turn should berequired when readjusting for contact sequence.

After completing the contact sequence procedure,recheck the contact wipe and gap for each pole. Ifthe specified contact gap, contact wipe andcontact sequencing cannot all be obtained, and itis determined that the breaker is operatingproperly, the interrupter is in need of replacement.

The front cover and interphase barrier assemblycan now be reinstalled. Return the racking screwto its original position by turning itcounterclockwise approximately two to three turnsuntil it stops.

Closing and Opening Times

After the operation intervals, it is recommendedthat the closing and opening times be checked.This can be done by use of a cycle counter, travelrecorder or oscillograph to monitor the time fromcoil energizing to contact kiss (closing) or part(opening).

Note: Normally, the closing time is not critical.The breaker performance is satisfactory if theClosing Speed and Opening Speed and Time arein spec. See Table A3 in the Appendix for thenominal values for these parameters.

The circuit breaker closing and opening timesshould be within the time ranges for normaloperation. Note the following:

• Times are from signal initiation to primarycontact kiss (make) or break.

• Times for DC controls supplied by a rectified

unconditioned power source, and all ACcontrols, may wander by as much as ±4msdue to the "current-zeroes" associated withsuch currents.

IB 6.2.7.7-1I13

• Below 0°C, the closing times will increase(but with no reduction in closing force), andopening times will usually be within thelimits.

• Adjustments to correct times, if found to be

outside limits, are critical and the nearestDistrict Office should be contacted forrecommendations.

Closing and Opening Speeds

The closing and opening speeds of the PrimaryContacts can be determined by use of a travelrecorder which records their linear travel versustime. The output can be fed into a travel recorderor oscilloscope.

Before the closing and opening speeds arechecked, the Contact Wipe should first beinspected. This is because, in addition to theenergy provided by The Opening Springs, theContact Springs provide additional accelerationenergy through the wipe distance upon contactpart. As the Primary Contacts erode, the ContactWipe decreases, and the opening speed willdecrease. Speeds should still be withinacceptable limits if the wipe is still within limits.Refer to Table A3 in the Appendix.

WARNINGDo not attempt to increase the opening speed byreadjusting the push rod to gain more contact wipe.

If either of the speeds are too slow, and theContact Wipe is within the limits specified,examine the breaker for any moving parts thatappear to be binding. If none can be found,consult the factory for assistance.

Latch Check Switch (Refer to Figure A8 inthe Appendix)

The circuit breaker mechanism is adjusted at thefactory for correct operation and should not bedisturbed unless the breaker does not closeelectrically on reclosing duty. This condition isusually caused when the latch check switch (whenused) is not actuated. The circuit breaker shouldnot close before the trip latch has reset.

Adjustments should be made with the Trip Latch(4) against Reset Stop Pin (3). Turn in AdjustingScrew clockwise (1) until contacts of switch"break" (as indicated by an audible click or checkwith bell ringer). Turn adjusting screwcounterclockwise until Switch (2) contacts "make,"then rotate adjusting screw counterclockwise oneturn more. (Adjusting screw is self-locking.)


Lubrication

All mechanism parts, bearings, pins etc. of theVHK vacuum circuit breakers have beenlubricated with Anderol 757 during factoryassembly. While any adjustments, tests and/orperiodic maintenance is being performed, it isrecommended that the grease for those parts beexamined.

If the grease should become contaminated orunduly oxidized (hardened and darkened), or ifparts are replaced, any relubrication should bedone with the same lubricant, available from ABBas part number 712994-C00 (1 LB can).

Note the following:

• The mechanism should be periodically inspectedfor lubrication contamination. The frequency ofinspection is dependent upon experience withthe operating environment.

• Anderol is a Lithium soap based syntheticlubricant. Anderol is not compatible with manyother lubricants. Mixing with other incompatiblelubricants will cause caking and discolorationand will require complete purging andrelubrication of breaker parts.

• Do not apply grease to latch or roller surfaces. • Do not use light oil to lubricate any mechanism

parts. In emergency situations, Anderol 732 may

IB 6.2.7.7-1I14

be used as a temporary lubricant if adequatetime (several hours) is allowed for the solvents toevaporate prior to any mechanical operations. Itis mandatory that the breaker undergo thoroughlubrication with Anderol 757 as soon as possible.Note that bearing surfaces must be repacked,requiring disassembly of the mechanism. Do notoperate the circuit breaker without completingthis procedure.

• Use of solvents to free contaminated lubricant is

strictly forbidden without immediate relubricationusing Anderol 757.

• The new Ryobi Charging Motor assemblies have

an exposed Gear Assembly which should belubricated with Anderol 757 during regularmaintenance schedules.

Dielectric Tests

It is recommended that dielectric withstand testsbe made prior to use and at routine maintenanceperiods to verify the integrity of vacuum circuit thebreaker. If, during the dielectric withstand test, therequired test voltage cannot be sustained acrossthe open contacts of the vacuum interrupter, theinterrupter may be faulty and must be replaced.Always insure that the contact air gap is correctbefore conducting primary circuit dielectric tests.

WARNINGDo not run any primary circuit dielectric withstandtests on isolated interrupters with open contactsabove rated voltage, unless test personnel areadequately shielded or are no less than six feetfrom the test unit.

WARNINGIf the circuit breaker has been energized, or it isunsure if the circuit breaker has ever beenenergized, the mid-band ring (on vacuuminterrupters so equipped) must first be dischargedbefore any work is performed on or near theinterrupters. A grounding stick must be used todischarge the ring by fastening the ground cable ofthe stick to known ground, and touching thegrounding tip of the stick to each mid-band ring.

Note the following:

• Dielectric test voltages higher than rated voltage,

applied across open contacts, may cause avacuum interrupter to emit some X-radiationwhich could be a health hazard on prolongedexposure at close range. Accordingly, eventhough the emission is low exposure times areshort. It is still considered appropriate toexercise caution. Therefore, do not run anyprimary circuit dielectric withstand tests onisolated interrupters with open contacts aboverated voltage unless test personnel areadequately shielded or they are no less than sixfeet from the test unit.

It is to be noted that no hazardous X-radiation isproduced with closed contacts at any test voltage,nor with open contacts at rated voltage, and thereshould be no cause for concern. If the breaker istested in its compartment at the test voltagesrecommended below, the steel enclosure willprovide sufficient shielding to protect personnelfrom X-radiation at the normal distancesmaintained for electrical safety.

The following test values should be used fordielectric testing the new breaker, and are to beapplied for a one-minute period:

NOTE: Only AC Hi-Pot tests are recognized asvalid by ABB. DC Hi-Pot, Meggers, etc. are notaccepted methods for Dielectric Testing.

• Primary Circuit, new interrupters36kV for 7.5VHK and 15VHK19kV for 5VHK

• Secondary Circuit1100VAC (except motor)540VAC (motor)

Once in service, the different circuits should betested at 75% of these ratings.

If it is desired to make a dielectric test on thesecondary control wiring, turn the spring chargingMotor Disconnect Switch to the "OFF" position.Apply test voltage for one minute to each of thesecondary contacts of the circuit breaker.

IB 6.2.7.7-1I15

If it is desired to make a dielectric test on thespring charging motor, turn the Motor DisconnectSwitch to the "ON" position. Apply test voltage forone minute to the motor circuit.

ELECTRICAL CHARACTERISTICS OFCONTROL DEVICES – (REFER TOFIGURES A10 AND A11 IN THEAPPENDIX)

NOTE: The charging time of the breaker with thenew Ryobi motor assembly is approximately eightseconds.

For operating voltage ranges and normal currentdraw for various nominal control voltages, refer toTables A1 and A2 in the Appendix. The currentvalues given are average steady state values.Momentary inrush currents for all charging motorsand coils are approximately three times thesevalues.

Please refer to the specific schematic diagramsand other operational information furnished withyour order. Typical schematics for generalelectrical information can be found in theAppendix.

DC and AC Closing Operating Sequence

With the circuit breaker open, closing springsdischarged, control power source energized, andmotor disconnect switch in ON position, operationoccurs as follows:

1. Immediately upon the availability of controlpower across disconnects "5" and "02", thespring charging motor is energized, which inturn charges the closing springs. When theclosing springs are charged, limit switchcontact "LSb" is opened, and limit switchcontact "LSa" is closed.

2. Operation of the close control switch (with its

power source), connected to disconnects "03"or "7" and disconnect "6", energizes the latchrelease coil (X) through the circuit breakerauxiliary switch "b" contact, the normallyclosed lockout relay contact "Yb", limit switchcontact "LSa". The latch release coil (X)releases the closing latch. The springs thendischarge to close the circuit breaker.

3. When the springs discharge, limit switch

contact "LSb" closes and switch contact "LSa"opens.

4. When limit switch "LSb" in the motor circuit

closes, the spring charging motor isenergized, which in turn recharges the closingsprings.

5. When the circuit breaker closes, all auxiliaryswitch "b" contacts open and all auxiliaryswitch "a" contacts close.

6. When the limit switch contact "LSb" closes,

the lockout relay coil (Y) is energized andopens lockout relay contact "Yb", which de-energizes the latch release coil (X). Lockoutrelay contact "Ya" closes, which seals-in thelockout relay coil (Y) as long as the "close"contact is maintained. The purpose of thelockout relay coil (Y) is to prevent pumping ofthe closing mechanism when closing against afaulted circuit.

7. After the breaker has closed and the "close"

switch is released by the operator, the lockoutrelay coil (Y) is de-energized. This allows thenormally-closed lockout relay contact "Yb" toclose, and the normally-open lockout relaycontact "Ya" to open.

8. The circuit breaker can be tripped by

operation of the trip control switch, connectedto disconnects "3" or "04" and disconnect "10",which energizes the circuit breaker trip coil(TC) through the auxiliary switch "a" contact.

9. The Undervoltage Device, if furnished,

provides a direct acting lock-open andundervoltage tripping feature. This devicemust be energized to initially close thebreaker, and also to maintain the breaker in aclosed position.

10. The latch check switch, if furnished, insures

that the tripping mechanism must be resetprior to energizing the closing latch releasecoil (X).

IB 6.2.7.7-1I16

AC Closing Operating Sequence(Prior to January 1996)

With the circuit breaker open, the closing springsuncharged, the control power source energizedacross disconnects "5" & "02" and "01" & "6", andthe motor disconnect switch in ON position,operation occurs as follows:

1. Immediately upon the availability of controlpower at terminals "05" and "02", the springcharging motor is energized, which in turncharges the closing springs. When theclosing springs are charged, limit switchcontact "LSa" is closed. Also, upon availabilityof control power at disconnects "01" and "6"through auxiliary switch "b" contact, and afterthe closing springs have been charged, thelockout relay coil (Y) will be energized throughthe circuit breaker auxiliary switch "b" contactand the parallel resistors R1 and R2. Thelockout relay will pick up and close contact"Ya".

2. Connecting wires "03" or "7" to control power

via operation of the close control switchenergizes the latch release coil (X) throughthe circuit breaker auxiliary switch "b" contact,the normally open lockout relay contact "Ya",and the limit switch contact "LSa". The latchrelease coil (X) releases the closing latch.The springs then discharge to close the circuitbreaker.

3. When the springs discharge, limit switch

contact "LSb" closes and limit switch contact"LSa" opens.

4. When limit switch contact "LSb" in the motor

circuit closes, the spring charging motor isenergized, which in turn recharges the closingsprings.

5. When the circuit breaker closes, all auxiliary

switch "b" contacts open and all auxiliaryswitch "a" contacts close.

6. When the limit switch contact "LSb" closes,the lockout relay coil (Y) is de-energized andopens lockout relay contact "Ya", which de-energizes the latch release coil (X). Lockoutcoil (Y) is locked out as long as the Closesignal is maintained. This is because the

maintained control power on disconnects "03"or "7" puts resistor R1 in parallel with lockoutcoil (Y). The additional current flow throughparallel resistors R2 & R3, and the associatedincreased voltage drop leaves insufficientvoltage to pick up the lockout relay. Thepurpose of the lockout relay is to preventpumping of the circuit breaker’s mechanismwhen closing against a faulted circuit.

7. After the breaker has closed and when the

closing control switch is released by theoperator, the lockout relay coil (Y) remains de-energized due to the auxiliary switch "b"contact in the closing circuit being open.

8. The circuit breaker can be tripped by

operation of the "Remote Trip" switch,connected to disconnects "3" or "04" anddisconnect "10", which energizes the circuitbreaker trip coil (TC) through the auxiliaryswitch "a" contact.

9. The Undervoltage Device, if furnished,

provides a direct acting lock-open andundervoltage tripping feature. This devicemust be energized to initially close thebreaker, and to maintain the breaker in aclosed position.

10. The latch check switch (LCS), if furnished,

insures that the operating mechanism must bereset prior to energizing the closing latchrelease coil (X).

11. The remote mounted capacitor trip feature

(recommended for AC trip), if furnished,provides an electrical energy storage network.Should a loss of control power occur at theinstant of a tripping signal, sufficient energywill be furnished to insure an electrical trippingoperation.

12. The stopping device switch, if applicable,

prevents electrical reclosing of the CircuitBreaker after a manual trip until the stoppingdevice switch has been manually reset.

IB 6.2.7.7-1I17

GROUND AND TEST DEVICES

These devices are supplied when ordered withcertain component variations such as Test Portsand Interlocks. The three basic types are:

• Simple, three- or six- terminal.

• Simple, three- or six- terminal, electrically(remote) operated.

• Complex, six-terminal, electrically (remote)operated, with manual selector switch.

These devices are basically maintenance free fortheir normal operating life. Racking proceduresare similar to the standard breaker as outlined(except that they only have a WITHDRAW andCONNECT position), and all detailed operationalinstructions are attached to the devices.

RENEWAL PARTS

Only those renewal parts that will be required toinsure proper and timely maintenance for normaloperation of the VHK vacuum circuit breakers arerecommended to be stocked. Copies of theapplicable Renewal Parts Bulletin for specificcircuit breakers will be furnished on request fromthe Component Sales Department (407-323-8220).

The minimum quantity of assemblies and itemsrecommended in these bulletins are predicted oninfrequent replacement of parts based onaccumulated tests and operating experience.Total assemblies are recommended forconvenient replacement, when it is necessary toreturn the breaker to service as quickly aspossible. The bulletins contain specific partordering instructions.

IB 6.2.7.7-1I A P P E N D I X18

CIRCUIT BREAKER ASSEMBLY WITH LIFTING YOKE INSTALLEDFIGURE A1

5

4

3

2

1

1 - FRONT COVER MOUNTING HARDWARE2 - FRONT COVER3 - LIFTING YOKE MOUNTING TEE HANDLES4 - LIFTING YOKE5 - FIFTH WHEEL HOLE

A P P E N D I X IB 6.2.7.7-1I19

FRONT CIRCUIT BREAKER PANELFIGURE A2

MOTORDISCONNECTSWITCH

MANUAL CHARGELEVER

MANUAL TRIP BUTTON

HOLE FOR FIFTHWHEEL

OPERATIONSCOUNTER

SPRINGINDICATOR

MANUAL CLOSE LEVER

IB 6.2.7.7-1I A P P E N D I X20

RACKING MECHANISMFIGURE A3

TYPICAL GAP0.030” - 0.090"

BLOCKINGLEVEREXTENSION

BLOCKING LEVER

PADLOCK HASP

RETAININGRING

ADJUSTABLELINK

INDEX LEVER

RELEASE LEVER

TRIP LEVER

RACK SCREW

A P P E N D I X IB 6.2.7.7-1I21

RACKING ARM

MANUAL CLOSELEVER

SHIMMEDADJUSTINGSCREW RACKING LOCK

BRACKET

CLOSINGSPRINGS

RACKING ARM

BLOCKINGARM LOCATEDBEHIND PLATE

WIPE MEASUREMENTPORT

JACKSHAFT

INTERLOCK SYSTEMFIGURE A4

IB 6.2.7.7-1I A P P E N D I X22

METHOD OF RACKING CIRCUIT BREAKERFIGURE A5

1 - BREAKER CELL DOOR2 - ACCESS DOOR TO RACKING MECHANISM3 - RACK RELEASE LEVER4 - RACKING CRANK

A P P E N D I X IB 6.2.7.7-1I23

CONTACT WIPE AND GAP MEASUREMENT - MODEL 05D/81/82FIGURE A6

SCRIBE MARKHERE FOR GAPMEASUREMENT

OPENINGSPRINGS

WIPE (CONTACT)SPRINGS

PRIMARY DISCONNECTS(A.K.A. TULIPS)

MID -BANDRING

METAL TOIINSULATIONINTERFACESEAL

NUT AND TRUNION BLOCK

IB 6.2.7.7-1I A P P E N D I X24

CONTACT WIPE AND GAP MEASUREMENT - MODEL 05CFIGURE A7

MID-BAND RING

METALTO INSULATIONINTERFACESEAL

A P P E N D I X IB 6.2.7.7-1I25

TRIP LATCH CHECK SWITCH ADJUSTMENTFIGURE A8

1 - ADJUSTING SCREW2 - SWITCH3 – RESET STOP PIN4 - TRIP LATCH

IB 6.2.7.7-1I A P P E N D I X26

CONTROL RELAYFIGURE A9

LIMIT SWITCH CRANK LEVER ADJ. SCREWAND LOCK NUT

CONTROL DEVICE

SECONDARYDISCONNECTS

AUXILARYSWITCH

A P P E N D I X IB 6.2.7.7-1I27

a- Auxiliary Switch Contact Closed When Breaker is Closed.b- Auxiliary Switch Contact Open When Breaker is Closed.LCb - Latch Check Switch Contact Closed When Breaker Operating Mechanism is Reset.LSa - Limit Switch Contact Open When Springs are Discharged. Closed When Springs arecharged.LSb - Limit Switch Contact Closed When Springs Are Discharged. Open When Springs areCharged.TC - Shunt Trip Coil.X - Closing Latch Release Coil.Y - Contol Relay Lockout Coil.Ya - Normally Open Relay Contact.Yb - Normally Closed Control Relay Contact.TB - Terminal Block Point.ML - Motor Lead.CE - Coil Lead End.C1,C2 - Terminal Jumper (Control Device).--< - Female Secondary Disconnect Contact.

TYPICAL DC SCHEMATIC OF CONTROL CIRCUITFIGURE A10

IB 6.2.7.7-1I A P P E N D I X28

TYPICAL AC SCHEMATIC OF CONTROL CIRCUITFIGURE A11

c- Auxiliary Switch Contact Closed When Breaker is Closed.d- Auxiliary Switch Contact Open When Breaker is Closed.LCb - Latch Check Switch Contact Closed When BreakerOperating Mechanism is Reset.LSa - Limit Switch Contact Open When Springs areDischarged. Closed When Springs are charged.LSb - Limit Switch Contact Closed When Springs AreDischarged. Open When Springs are Charged.TC - Shunt Trip Coil.X - Closing Latch Release Coil.Y - Contol Relay Lockout Coil.Ya - Normally Open Relay Contact.Yb - Normally Closed Control Relay Contact.TB - Terminal Block Point.ML - Motor Lead.CE - Coil Lead End.C1,C2 - Terminal Jumper (Control Device).--< - Female Secondary Disconnect Contact.

A P P E N D I X IB 6.2.7.7-1I29

Table A1 – Control Circuit Operating Voltage Range

UNDERVOLTAGENominalControlVoltage

SpringCharging

Motor

CloseCoil

TripCoil

Pick-upRange

Drop OutRange

24 VDC - 19 - 28 VDC 14 - 28 VDC 14 – 19 VDC 7 –14 VDC

48 VDC 38 – 56 VDC 38 – 56 VDC 28 – 56 VDC 29 – 38 VDC 15 – 29 VDC



120 VAC 104 – 127 VAC 104 – 127 VAC 104 – 127 VAC 69 – 92 VAC 35 – 69 VAC

240 VAC 208 – 254 VAC 208 – 254 VAC 208 – 254 VAC 140 –180 VAC 69 – 140 VAC

Table A2 – Control Circuit Typical Current Values

NOMINALCONTROLVOLTAGE

SPRINGCHARGING

MOTOR*(AMPS)

CLOSECOIL

(AMPS)

TRIPCOIL

(AMPS)

LOCKOUTCOIL

(AMPS)

UNDERVOLTAGE

(AMPS)

N.E.C. FUSE(AMPS)

24 VDC - 22.0 22.0 0.30 0.9 30

48 VDC 10.0 10.7 3.1 0.15 0.3 15

125 VDC 5.0 5.0 1.3 0.06 0.2 10

250 VDC 3.0 2.2 0.6 0.03 0.1 10

120 VAC 5.0 4.5 6.5 0.40 0.5 10

240 VAC 3.0 2.3 1.2 0.20 0.2 10

* SPRING CHARGING MOTOR VALUES ARE FOR RYOBI MOTORS ONLY

IB 6.2.7.7-1I A P P E N D I X30

TABLE A3 - VHK OPERATING PARAMETERS

5VHK250MVA

15VHK500MVA

15VHK750MVA

15VHK1000MVA

15VHK1600MVA

♠CLOSING TIME (MS) 40 - 60 40 - 60 40 - 60 40 - 60 40 - 60

OPENING TIME (MS) 25 - 35 25 - 35 25 - 35 25 - 35 25 - 35

CLOSING SPEED(FT/SEC)

1.9 - 5.0 1.9 - 5.0 1.9 - 5.0 1.9 - 5.0 1.9 - 5.0

OPENING SPEED(FT/SEC)

3.9 - 7.0 3.9 - 7.0 3.9 - 7.0 3.9 - 7.0 3.9 - 7.0

GAP (INCHES) 0.310 MIN 0.310 MIN 0.310 MIN 0.310 MIN 0.375 MIN

♣WIPE (INCHES)(NEW BREAKER)

0.145 - 0.219 0.145 - 0.219 0.145 - 0.219 0.145 - 0.219 0.145 – 0.219

♥MAXIMUMMILLIVOLT DROP

8 MAX (1200)7 MAX (2000)

8 MAX (1200)7 MAX (2000)

8 MAX (1200)7 MAX (2000)

6.5 MAX (1200)5.5 MAX (2000)5.0 MAX (3000)

5.0 MAX (3000)

♥MAXIMUM MICRO-OHMS

40 MAX (1200)35 MAX (2000)

40 MAX (1200)35 MAX (2000)

40 MAX (1200)35 MAX (2000)

32.5 MAX (1200)27.5 MAX (2000)25 MAX (3000)

25 MAX (3000)

♠ IF CLOSING TIME IS OUT OF RANGE, CLOSING SPEED IS TO BE USED TO DETERMINEIF BREAKER PERFORMANCE IS ACCEPTABLE.

♣ WIPE RANGES ARE FOR NEW BREAKERS ONLY. WIPE IS ALLOWED TO DECREASE TO 0.031”.

♥ WITH 200 AMPS DC FLOWING FOR NEW BREAKERS. CIRCUIT BREAKER RESISTANCEIS ALLOWED TO INCREASE BY 100% FOR USED BREAKERS.

.

A P P E N D I X IB 6.2.7.7-1I31

IB 6.2.7.7-1I A P P E N D I X32

A P P E N D I X IB 6.2.7.7-1I33

IB 6.2.7.7-1I A P P E N D I X34

ABB Power T&D Company, Inc.Distribution Systems Division

Division HeadquartersSwitchgear Systems Circuit Breaker OperationsIEC Products & Systems OEM ComponentsAfter-market Components KIRKTM Interlock Systems

201 Hickman Drive 2300 Mechanicsville HighwaySanford, FL 32771 Florence, SC 29501(407) 323-8220 (843) 665-4144(407) 322-8934 (Fax) (843) 667-5109 (Fax)

VHK Model 05 {6-2-7-7-1I} vacuum power circuit breakers. ... transmitted light is usually required...

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Transcript of VHK Model 05 {6-2-7-7-1I} vacuum power circuit breakers. ... transmitted light is usually required...