Figure 1.Type KFE recloser combines vacuum interruption with hydraulic counting andelectronic fault sensing and trip timing.

These instructions do not claim to cover all details or variations in the equipment, procedure, or process described, nor to provide directionfor meeting every possible contingency during installation, operation, or maintenance. When additional information is desired to satisfy aproblem not covered sufficiently for the user’s purpose, please contact your Cooper Power Systems sales engineer.

December 1992 • Supersedes 7/86

ReclosersService Information

KFE10002-EType KFE and KFVE Electronically ControlledVacuum Recloser Installation Instructions

1

Before performing electrical tests ontypes KFE and KFVE Reclosers, referto Service Information S280-90-1,"Vacuum Interrupters RadiationWarning".

RADIATIONWARNINGN

82049KMA

CONTENTSShipment and Acceptance ............. 2Handling and Storage ..................... 2Description ...................................... 2

Recloser .......................................... 2Vacuum Interruption ........................ 2Electronic Control ............................ 3Ratings and Specifications .............. 3Dimensions and Weights ................. 4Operating Levers and Indicators. . . 4

Manual Operating Handle ............ 4Non-Reclosing Lever .................... 4Contact-Position Indicator ............ 4Operations Counter ...................... 4Ground-Trip Disabling Switch........ 5

Closing Solenoid ............................. 6 Closing Solenoid Operation ......... 6Low Energy Tripper ...................... 7

Adjustments ..................................... 8Operations to Lockout ..................... 8Number of Fast Operations ............. 8Sequencing Mechanism................... 8

Phase-Trip Sequence ................... 8Ground-Trip Sequence ................. 8

Reclosing Time ................................ 9Reset Time....................................... 9

Electronic Control ........................... 9Current Sensing ..............................10Minimum-Trip Selection ...................10Time-Current Trip

Characteristics .............................10Phase-Trip Timing Cards ..............10Ground-Trip Timing Cards.............10

Control Power ..................................12Installation .......................................12

Preliminary Checks .........................12Oil Level .......................................12Recloser .......................................12Electronic Control .........................12Vacuum Interrupters......................12

Lifting ..............................................13Mounting .........................................14

Direct Mounting ............................14Pole Mounting ..............................15Substation Elevating

Structure ....................................16Main Wiring Connections ForInstallation .......................................17

Bypass Switches .............................17Surge Protection .............................18Grounding .......................................18High Voltage ....................................18

Placing Recloser in Service ...........18Manual Operation of Energized

Recloser .......................................18Manual Operation of De-energized

Recloser .......................................18Non-Reclosing Operation ................19

In-Service Recloser Operation ........19Testing ..............................................19

Test Equipment Required ................20Test Procedures—Electrical

Closing ........................................20Operation of Closing

Solenoid ...................................20Phase Minimum-Trip Current........21

“A” Phase .................................21“B” Phase ..................................21“C” Phase ..................................21

Ground Minimum-TripCurrent .....................................21

Operating Sequence andReclosing Time—Phase ...........21

Operating Sequence andReclosing Time—Ground .........21

Operation of Non-ReclosingLever ........................................21

Test Procedures—ManualClosing ........................................22Phase Minimum-Trip Current .......22

“A” Phase ..................................22“B” Phase .................................22“C” Phase .................................22

Ground Minimum-TripCurrent .....................................22

Recloser Accessories ......................22Extra Creepage Bushings ................22Bushing Type Multi-Ratio

Current Transformers ....................22Bushing Current Transformer

Connections ..................................23Accessory-Connection

Junction Box ..................................23Auxiliary Switch ...............................24Lockout-lndicating Switch ................24Remote-Trip .....................................25Remote-Lockout ..............................25Remote-Close ..................................25Low-Voltage Closing ........................26

Control Accessories ........................26Instantaneous Trip ...........................26Fault-lndicator Target .......................27

Figure 2.KFE electronic control.

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83490KMA

CAUTIONDo not energize this equipment out of oil.

SHIPMENTAND ACCEPTANCEEach KFE or KFVE recloser is complete-ly assembled, tested, and inspected atthe factory. It is carefully calibrated,adjusted and filled to the correct levelwith insulating oil. It is in good conditionwhen accepted by the carrier for ship-ment.1. Upon receipt, inspect the recloser

thoroughly for damage and loss ofparts or oil incurred during shipment.If damage or loss is discovered, file aclaim with the carrier immediately.

2. Check for oil leakage and tighten allbolts that may have loosened duringshipment, especially the bolts whichattach the head to the tank.

HANDLING AND STORAGEIf the recloser is to be stored for sometime before installation, provide a clean,dry storage area. Take precautions dur-ing handling and storage to minimize thepossibility of mechanical damage; in par-ticular, protect the bushings and controlequipment.

DESCRIPTIONA complete Type KFE or KFVE Recloserassembly consists of a KFE or KFVErecloser and a separate control cabinetconnected to the recloser with a 6-foot-long control cable. The control cabinet isdesigned to be mounted to the reclosertank, however it can be mounted to thepole or other mounting structure at a dis-tance equal to the cable length. The con-trol cable is hard-wired to the recloserand attached to the control with a thread-ed, separable weatherproof connector.

RecloserThe Type KFE Recloser is a self-contained,three-phase current interrupting device.KFE reclosers protect systems rated 2.4through 14.4 kV, KFVE reclosers 2.4through 24.9kV, both are rated at 400 ampsmaximum continuous and 8000 amps sym-metrical interrupting. The KFE and KFVEReclosers sense both line current and zero-sequence ground (earth) current and auto-matically interrupts all three phases of thedistribution circuit to which it is connectedwhen any current exceeds the minimum-trip level. It automatically recloses to restoreservice if the fault is temporary. If the fault ispermanent the recloser locks out after two,three or four preset trip operations. Oncelocked-out, the recloser must be manuallyreset to restore service. Should the faultclear before lockout, the recloser will resetautomatically for another sequence of oper-ations.

The recloser can be also set for nonre-closing operation (lockout after the first tripoperation) with a manually operated exter-nal non-reclosing lever.

The trip operations of the recloser can beall fast, all delayed, or any combination offast operations followed by delayed opera-tions up to a maximum total of four. Fastoperations clear temporary faults beforebranch line fuses are damaged. Delayedoperations allow time for fuses or otherdownline protective devices to clear to limitpermanent faults to the smallest section ofline.

The KFE and KFVE Reclosers employ asimple time-proven hydraulic mechanism tocount operations, program the operatingsequence, and determine reclosing time.Solid state electronics provide the accuracy,reliability, and flexibility for overcurrent sens-ing and trip timing. The electronic circuitsare housed in a separate cabinet attachedto the recloser tank and connected to therecloser with a six-foot cable.

Vacuum InterruptionArc interruption takes place within the threesealed vacuum interrupters. Oil is used forelectrical insulation, but is not involved in arcinterruption. The insulating oil is also used inthe counting and sequencing mechanismand in reclose timing.

The moving contacts in the vacuum inter-rupters are driven by the release of openingsprings. A low energy tripper actuated by theelectronic circuitry releases the openingspring when line current is sensed above thepreset minimum-trip level. Closing energy,as well as energy to charge the openingspring, is supplied by a high-voltage closingsolenoid momentarily connected phase-to-phase through a high-voltage contactor.

KFE10002-E

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Electronic ControlThe electronic circuits and the plug-inunits for programming minimum-trip andtrip timing are located in a separate cabi-net mounted to the recloser tank asshown in Figure 2. No external powersource or battery is required to operatethe electronics. Power is obtained fromthe line by means of bushing currenttransformers. A minimum of 5 amperesof primary current flow is sufficient topower the electronics and charge the tripcapacitors which actuate the low energytripper. In addition, a pickup coil woundon one leg of the closing solenoid, pro-vides additional charge to the trip capaci-tors during each reclosing operation toinsure that the electronic circuits areenergized at the instant of contact make.

Electronic control circuitry is central-ized on a single printed circuit boardwhich is easily field-replaceable. Plug-intr ip resistors and tr ip-timing curvesincrease application flexibility and areeasily installed. Instantaneous phase-and ground-tripping and fault-indicatingaccessories are available to fur therenhance the application capabilities ofthe control.

RATINGS ANDSPECIFICATIONSThe recloser will operate effectively onlywhen applied within its specified ratings.Consult the following ratings tables andcompare to system characteristics atpoint of application prior to installation.

Table 1Voltage Ratings

Table 2Current Ratings

Table 3Interrupting Ratings

Table 7Duty Cycle

Table 5Closing Coil Impedance Ratings

Table 6Mechanical Specifications

Table 4Operating Times

KFE KFVENominal operating

(kV) . . . . . . . . . . . . . . 2.4-14.4 2.4-24.9Maximum design (kV). . 15.5 27.0Impulse withstand

(BIL)* 1.2 x 50microsecond wave,crest (kV) . . . . . . . . . 110 125

60-Hz withstand (rms)Dry, 1 min (kV) . . . . . 50 60Wet, 10 sec (kV) . . . . 45 50

RIV at 1000 kHz, at9.41 kV (microvoltsmax) . . . . . . . . . . . . . 100 100

Operating frequency(Hz) . . . . . . . . . . . . . . 50-60 50-60

*In accordance with ANSI standard C37.60-1981.

Maximum continuous current(amps) ............................................ 400

Overload capability (4 hr) (amps)....... 500*(2 hr) (amps). . .... 600*

Interrupting current (amps) ............... 8000Magnetizing interrupting current

(amps) ............................................ 14KFE cable charging current at 8.94 kV

(Ø to gnd) (amps) ........................... 2KFE cable charging current at 15.5 kV

(Ø to gnd) (amps) ........................... 5Three-second current

(rms sym amps) ............................. 8000Momentary currnet (rms sym amps) .. 12800Surge current (amps).......................... 65000

*After level-off rated continuous current.

*A four-second reclosing time is available.

Normal reclosing time (sec) .................. 2*Resetting time at 25o C

(minutes per recloser operation)......... 1.5

Minimum Trip Maximum interruptingCurrent Current(amps) (rms symmetrical amps)

Phase Ground10 5 800020 10 800030 20 800050 30 800070 50 8000100 70 8000140 100 8000200 140 8000280 200 8000320 280 8000400 320 8000450 400 8000560 — 8000800 — 8000

% of MaxNumber of Interrupting CircuitOperations Rating X/R Ratio

KFE KFVE96 15—20 3 4

120 45—55 7 832 90—100 14 15

248 Total Operations

Nominal Impedance ac Reactance dcac Voltage Z Resistance X Power Resistance

(kV) (ohms) (ohms) (ohms) Factor (ohms)

2.4 41.83 16.01 38.65 38.3 8.224.164.8 149.43 62.09 135.92 41.5 31.527.27.62 408.49 145.86 381.56 35.7 84.128.08.32 504.02 172.05 473.74 34.1 95.9911.5 978.14 316.03 925.68 32.3 211.412.012.47 1163.5 384.6 1098.1 33.1 226.913.214.4 1551.89 511.64 1465.12 33.0 550.820.0 3034.32 967.32 2875.0 31.9 647.8

125 (Vdc) - - - - 1.289250 (Vdc) - - - - 4.77

Operating temperature (o C):Minimum ..................................................................................................... -20Maximum ................................................................................................... 40

Close mechanism .......................................................................................... Solenoid closeOpen mechanism........................................................................................... Spring operatedContact close time (cycles)............................................................................ 0.75Contact gap (cm) (in.) .................................................................................... 0,95 (0.375)Contact open time (cycles) ............................................................................ 0.50Interrupting time (cycles) .............................................................................. 1.50Allowable contact erosion (cm) (in.)............................................................... 0,32 (0.125)Resetting time, integrator, minutes at 25o C; per trip operation.

Quick reset after lockout ............................................................................. 1.5 (approx.)Resistance, Nominal (micro-ohms):

Bushings, terminal-to-terminal .................................................................... 400Across the interrupter.................................................................................. 25

Reclosing time (see at 25o C) ........................................................................ 1.5—2.5Mechanical life (minimum operations) ........................................................... 2500

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Operating Levers andIndicatorsThe operating levers and indicators for theType KFE and KFVE Reclosers are locatedunder the sleet hood (Figures 4 and 5).

MANUAL OPERATING HANDLEThe manual operating handle (yellow) per-mits manual opening and closing of anenergized recloser. Pulling down the handletrips and locks open the main contacts ofthe recloser. Lifting up the handle closes theclosing-coil contactor, and if high-voltagepower is supplied to recloser bushing termi-nals 1 and 5, the closing coil will close themain contacts. The handle can be operatedwith a hookstick.

The handle is trip free, meaning that it willnot impart a blow to the operator if therecloser trips on a fault while the handle isbeing held closed. However, the recloser willcontinue to reclose and trip (in excess of itsprogrammed number of operations to lock-out) until the handle is allowed to drop tothe open position.

When the recloser operates to lockout,the yellow handle drops down from underthe sleet hood. It must be reset manuallyfrom the lockout position before the reclosercan close.

NON-RECLOSING LEVERThe non-reclosing lever provides the reclos-er with the capability of locking out on thefirst trip operation regardless of the opera-tions to lockout setting inside the recloser.This feature provides added safety duringdownline, hotline work.

The non-reclosing lever can be operatedwith a hookstick. For nonreclosing operationit is pulled from under the sleet hood to itsdown position. It must be manually returnedto the up position in order to return therecloser to its pre-programmed number ofoperations to lockout.

The recloser can be opened or closedmanually regardless of the position of thenon-reclosing lever.

CONTACT-POSITION INDICATORLocated on the outboard side of the sleethood, this indicator shows the word “OPEN”when the main recloser contacts are openand “CLOSED” when the recloser contactsare closed.

OPERATIONS COUNTERA three-digit mechanical counter, locatedunder the sleet hood, cumulatively recordseach time the recloser opens.

Table 8Dimensions and Weights

Figure 3.KFE and KFVE top and front view dimensions.

KFE KFVERecloser weight with oil, kg (lb.) . . . . . . . . . . . . . . . . . . . . . . . . . . 172 (380) 189 (416)Recloser weight with pole-top frame, kg (lb.) . . . . . . . . . . . . . . . . 181 (400) 198 (436)Recloser weight with substation frame, kg (lb.) . . . . . . . . . . . . . . . 240 (530) 257 (566)Recloser oil capacity, liters (gal.) . . . . . . . . . . . . . . . . . . . . . . . . . . 71,9 ( 19) 71,9 ( 19)Standard bushing creepage, cm (in.) . . . . . . . . . . . . . . . . . . . . . . .. 29,53 (115/8) 67,3 (26.5)

KFE10002-E

Figure 4.Untanked Type KFE recloser viewed from interrupter side.

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GROUND-TRIP DISABLINGSWITCHLocated on the recloser head, oppositethe sleet hood (Figure 5), this manuallyoperated switch disables the groundtripoperation when pulled to its “blocked”position. It can be hookstick operatedand will remain in the down position untilmanually returned.

82051KMA

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Figure 6.Head mechanism of Type KFE recloser (head removed).

82061KMA

Closing SolenoidEnergy to operate the recloser mecha-nism to close the vacuum interrupter con-tacts, compress the contact pressuresprings and charge the opening spring isobtained from the system through a high-voltage closing solenoid. As shown inFigure 7, this solenoid is connectedphase-to-phase on the recloser’s sourceside through a high-voltage contactor(switch). Selection of the closing solenoidvoltage rating is based on the phase-to-phase voltage of the system on which therecloser is to be used.

Low-voltage dc closing coils (125 or250 Volts) are available for the closingsolenoid. Rectifier kits to operate the dccoils from a 120- or 240-Vac source, asapplicable, are also available. Electricalpower for low-voltage closing is suppliedthrough a junction box mounted on therecloser head.

CLOSING SOLENOlD OPERATIONThe closing operation is illustrated by con-sidering the recloser to be connected tothe line but locked-out (yellow manualoperating handle in downward position).To close from lockout, the manual operat-ing handle is raised to the closed position.This allows the closing solenoid contactorto close the phase-to-phase connection,thereby energizing the closing solenoidand imparting a downward acceleration tothe solenoid plunger. Downward move-ment of the plunger causes the recloseroperating mechanism to effect the follow-ing actions:

· Contact operating rods move down-ward to close vacuum interruptercontacts and compress contactpressure springs.

· Closing solenoid contactor opens.· Opening spr ing is charged and

recloser mechanism sets up for atripping operation.

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Figure 8.Low energy tripper.

Figure 7.Schematic diagram of recloser's major electrical and mechanical components.

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Low Energy TripperThe low energy tripping mechanism, oper-ated from the electronic control, initiatesthe overcurrent tripping operation. Themechanism consists of a permanent mag-net, and an armature and coil assemblywhich operate a trip lever (Figure 7).

During the closing operation, an electro-magnetic charging coil instantaneouslycharges the trip capacitors in the electronictrip control—assuring that the recloser isarmed and ready for an immediate tripoperation if necessary. When the recloseris closed, the tripper armature plunger isheld in by the magnetic force of the perma-nent magnet. In this position, the armaturespring is compressed and energized—ready to withdraw the armature when mag-netically released.

During a trip operation, the stored ener-gy in the trip capacitors energizes thesolenoid coil in the low energy tripper. Thiscreates a counter-magnetic field whichmomentarily neutralizes the field of the per-manent magnet—thus allowing the springdriven armature movement to instanta-neously operate the trip lever which in turnopens the recloser contacts. As the reclos-er contacts open, the pre-charged resetspring is released and returns the solenoidplunger to its de-energized position. Thislow energy trip assembly is thus recockedand able to perform another trip operationas soon as a closing operation is completed.

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Figure 9.Simplified diagram showing operations to lockout settings on counting mechanismrachet rod.

ADJUSTMENTSThe operating characteristics of the TypeKFE and KFVE Reclosers are preset andtested at the factory to operate as speci-fied on the data plates attached to thesleet hood. However, if the recloser is relo-cated or the coordination scheme is modi-fied, these characteristics can be easilychanged in the field. The adjustments areaccessible under the head casting afterthe tank has been lowered.

Operations to LockoutThe recloser can be set for 2, 3, or 4 oper-ations to lockout. The number of trip oper-ations to lockout is counted by the lockoutintegrator which trips the lockout mecha-nism when the preset number of phase,ground, or any combination of phase andground operations is reached. Reclosercan be set for one operation to lockoutwith the non-reclosing lever as describedin the “Operating Levers and Indicators”section.

The number of operations to lockout isdetermined by the position of a cylindricalspacer, held in place by an “E” ring in oneof the three grooves on the upper end ofthe integrator ratchet rod. Figure 9 showsthe mechanism set for 4 operations tolockout. The recloser mechanism must beuntanked to gain access to the lockoutintegrator which is mounted on one end ofthe mechanism frame.To change the operations to lockout setting:1. Remove the “E” ring from the rod.2. Position the spacer above the groove

for the desired number of operations tolockout as indicated in Figure 9 andsnap the “E” ring into the groove.

3. Make sure the spacer seats properly onthe “E” ring.

Number of Fast OperationsThe phase- and ground-trip cams of thesequencing mechanism are used to pro-gram the number of fast trip operationsrequired in the recloser’s operatingsequence. As seen in Figure 10, the camplates contain an indexing number (0, 1, 2,3) for both phase and ground. The operat-ing sequence is set by simply lifting thelocking tab on either the phase- or ground-trip cam and rotating it until it aligns withthe desired number of operations on thefast curve. The number of slow operationswill be automatically established — it willbe the difference between the number offast operations and the number of opera-tions to lockout. In all cases, the total num-ber of operations on both phase and

Sequencing MechanismThe sequencing mechanism consists ofa cam rod, a phase- and ground-tripcam, and a phase- and ground-sequencing switch connected to theelectronic control. It determines onwhich characteristic the recloser willtime its opening operations. The mech-anism is actuated by movement of theratchet rod as shown in Figure 10.

When the recloser operates, therachet rod moves upward as previouslydescribed and causes a similar upwardmovement of the cam rod. This causesa counterclockwise rotation of the camassembly.

As the recloser operates through itspreset program, the sequencing switchrollers r ide along the phase-andground-trip cam edges. When the fastoperations have been completed, thecam assembly will have rotated suffi-ciently to cause the sequencing roller toengage the sequencing switch. Thisswitches the electronic control to itsslow timing characteristic.

The sequencing mechanism willreturn to its reset position as the count-ing mechanism resets.

PHASE-TRIP SEQUENCETo change the phase-trip sequencesetting refer to Figure 10:1. Lift the locking tab on the spring-loaded

phase-trip cam, (the front cam, stamped“PHASE”) to disengage the locking pinfrom the indexing plate.

2. Rotate the cam to align the locking pinwith the slot for the desired number ofoperations on the fast curve.

3. Release the tab making sure the pin isengaged in the proper slot of the index-ing plate.

GROUND-TRIP SEQUENCETo change the ground-trip sequence settingrefer to Figure 10:1. Lift the locking tab of the spring-loaded

ground-trip sequence cam (the rear cam)to disengage the locking pin from theindexing plate.

2. Rotate the cam to align the locking pinwith the slot for the desired number ofoperations on the faster curve.

3. Release the tab making sure the pin isengaged in the proper slot of the index-ing plate.

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Figure 10.Sequencing mechanism and number of fast operations settings.

Figure 11.Type KFE and KFVE electronic contrrol.

KFE10002-E

83490KMA

Reclosing TimeThe reclosing time is a fixed 2-seconddelay controlled by an orifice on the bot-tom of the closing coil. Reclosing time isnot adjustable.

Reset TimeThe KFE and KFVE Reclosers include aquick-reset feature which resets the lock-out integrator whenever lockout occurs.

For faults cleared before lockout, theintegrator resets at a rate of approxi-mately 1.5 minutes per operation at25oC.

ELECTRONIC CONTROLThe Type KFE and KFVE ElectronicControls utilize solid-state circuitry andprovides the intelligence for currentsensing and trip timing. All the controlelectronics and electronic accessoriesare located in an external cabinet con-nected to the recloser with a 6 foot-longcable. No battery or external powersource is required to operate the elec-tronics. Power is obtained from the lineby means of bushing current transform-ers. The separate control cabinet isintended to be mounted to the reclosertank, although it can be mounted to thepole or other mounting structure at a dis-tance equal to the cable length.

Figure 12.Functional block diagram of the Type KFE and KFVE electronic control. Figure 13.

Typical time-current curve plug-in circuitcard (phase-trip "B" curve shown).

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Current SensingThe KFE and KFVE Reclosers have six1000:1-ratio sensing-current transformersmounted on the bushings under thehead— which provide both phase andground (zero-sequence) current sensing.The CT’s are connected to the electroniccontrol cabinet through the 6-foot controlcable. A solid-state CT protector is con-nected to the current transformers insidethe recloser, ahead of the cable discon-nect, to permit disconnection of the con-trol cable.

Minimum-Trip SelectionThe minimum-trip current ratings (Table9), for both phase (10-800 amps) andground (5-400 amps) are established byplug-in resistor cartridges mounted in thelower left corner of the electronic controlcabinet (Figure 11). The cartridges arelabeled with their minimum-trip currentvalues and are identified for PHASE-TRIP(3 required) and GROUND-TRIP (1required). All three phase-trip cartridgesmust have the same current rating. Theminimum-trip setting of the recloser canbe changed by merely changing the tripresistors. A 1 amp ground minimum-triprating is also available by jumping tabs Xand Y on the main circuit board andinstalling a 5 amp ground minimum-tripresistor.

Table 9Minimum-Trip Current Ratings

Minimum-Trip Current Ratings* (Amps)Phase Ground

10 520 1030 2050 3070 50

100 70140 100200 140280 200320 280400 320450 400560800

* Minimum-trip levels are within ± 10% of the publish-ed value at 25oC, except for the 5 amp ground-triplevel which is within ± 15% of the published value aat 25oC.

Time-Current TripCharacteristicsThe complete set of KFE and KFVE time-current characteristic (TCC) curves forboth phase- and ground-tripping is pub-lished in “Reference Data KFE10004-E”.Typical sets of curves are illustrated inFigures 14 and 15. They are establishedby individual circuit cards (Figure 13) thatplug into the circuit board of the control.

The large number of plug-in time-cur-rent characteristic curves available forthe electronic control enable the KFE andKFVE to meet a wide variety of applica-tion requirements and simplify coordina-tion with other protective devices in thedistribution system. All timing starts at ini-tiation of a fault, or when closing into afault. Phase and ground TCC circuitcards are not interchangeable.

PHASE-TRIP TIMING CARDSPhase-trip TCC curves are “A” (fast), “B”(delayed), and “C” (extra-delayed). The “A”curve is permanently wired on the controlcircuit board. The “B” and “C” curves areavailable on individual printed circuit cards(Figure 13) which plug into the 2nd PHASE-TIMING socket at the top of the control cir-cuit board.

GROUND-TRIP TIMING CARDSGround-trip inverse time TCC curves are “1”(fast), “2” (delayed) and “3” (extra-delayed).Also available are nine constant-time TCCcurves: #1-0.1 sec, #2-0.2 sec, #3-0.5 sec,#4-1.0 sec, #5-2.0 sec, #6-3.0 sec, #7-5.0sec, #8-10.0 sec, and #9-15.0 sec.

All ground-trip timing curves are generat-ed by individual printed circuit cards whichplug into the 1st GROUND-TIMING or 2ndGROUND-TIMING sockets at the top of thecontrol circuit board as shown in Figure 11.

When dual timing operation is pro-grammed the TCC curve in the 1stGROUND-TIMING socket always precedesthe curve in the 2nd GROUND-TIMINGsocket. Therefore, the faster of the two timesselected should be installed in the 1stGROUND-TIMING socket. When single tim-ing operation is programmed the timing cardis installed in the 2nd GROUND-TIMINGsocket and the ground-trip sequence cam isset for 0 fast operations.

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Figure 14.Typical set of time-current curves for phase-trip operations.

KFE10002-E

Figure 15.Inverse time-current curves for ground-trip operation.

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Control PowerThe KFE and KFVE reclosers are com-pletely self-contained and require noexternal power source or battery to oper-ate the electronics. The electronic circuit-ry is powered from the line by means ofbushing current transformers mountedunder the recloser head. A minimum of 5amperes of primary current flow is suffi-cient to power the electronics and chargethe trip capacitors which actuate the low-energy tripper. In addition, a pickup coilwound on one leg of the closing solenoidframe provides additional charge to thetrip capacitors during each reclosingoperation. This insures that sufficient trip-ping power is available immediately fol-lowing a closing operation—thus elimi-nating the necessity of a time delay tocharge trip capacitors from load or faultcurrent.

INSTALLATIONPreliminary ChecksOIL LEVEL1. Using the dipstick located on the top of

the recloser head, make sure the oil inthe recloser tank is between the limitsspecified on the dipstick.

2. Perform a dielectric test on the oil inaccordance with ASTM-approved test-ing procedures (see R280-90-1 fordetailed oil specifications and tests).A. The oil must have a minimum

dielectric strength of 26 kV.B. If the dielectric strength of the oil is

less than 26 kV, filter the oil torestore the dielectric strength tothe acceptable minimum level.

RECLOSERMake sure that the ratings and settings list-ed on the recloser data plates are correctfor the planned installation.

CAUTIONClosing coil voltage rating of the reclosermust equal system voltage.

At voltages up to the specified test volt-ages, the radiation emitted by the vac-uum interrupter is negligible. Howeverat higher test voltages radiation injuri-ous to personnel may be emitted. SeeRadiation Warning Service InformationBulletin S280-90-1, Vacuum InterrupterRadiation Warning, for further details.

RADIATIONWARNINGN

All reclosers are carefully tested andadjusted at the factory to operate accord-ing to published data. Well equipped testfa-cilities,a detailed testing procedure, andthoroughly trained personnel assure accu-rately calibrated equipment. Each recloserleaves the factory ready for installation.Pre-installation testing is not necessary.

ELECTRONIC CONTROLAll electronic controls are carefully testedat the factory and shipped with plug-incomponents connected and ready for oper-ation. Before installation, inspect controland make sure that all plug-in componentsare correct for the planned installation andthat the control cable is connected betweenrecloser and control.

VACUUM INTERRUPTERS

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KFE10002-E

Radiation InformationIt is possible for X-radiation to resultwhen voltage in excess of the 27-kVrated maximum voltage is appliedacross the open-contact gap of a vacu-um interrupter. Such radiation canbecome a health hazard upon longexposure at close range. When perform-ing high-voltage tests on vacuumreclosers, personnel safety can beinsured by noting the following informa-tion and taking the necessary precau-tions.1. American National Standard C37.09-

1964 "A-C High-Voltage circuitBreakers" allows tests after deliverywhich include applicatin of 75 per-cent of rated low-frequency with-stand voltage across open contactsof the interrupters.NOTE: To prevent possible interrupterdamage, dc test source should be limitedto 100 milliamps maximum. (A dc arc,once struck, will not extinguish sincethere is no current zero as in ac.)

2. At these voltages, radiation is negligiblewhen interrupters are mounted in therecloser operating structure, installed inthe oil-filled recloser tank, and have con-tacts open to the recommended ,953 cm(3/8 in.) open-contact gap.

3. Testing at voltages higher than those list-ed in Item 1 may cause radiation emis-sion injurious to personnel. If testing is tobe performed at voltages above thoselisted in item 1, additional radiationshielding is required.

4. Vacuum interruper testing above 50 kV acrms is not recommended.

To check the vacuum integrity of theinterrupter assemblies, the following pro-cedure can be used:

With the recloser in the open position,perform a high-pot test across each openvacuum interrupter assembly at 37.5 kVrrns, 60 Hz KFE, 45 kV rms, 60 Hz KFVE;or 53 kV dc KFE, 63.5 kV dc KFVE; forone minute. To prevent possible damageto the vacuum interrupters, the dc testsource should be limited to a maximum of100 milliamps. The interrupter shouldwithstand the test voltage and should notload down the source.

Lifting

CAUTIONFollow all approved safety practices forlifting methods and equipment when lift-ing the recloser.

The KFE and KFVE reclosers areequipped with a single lifting lug intendedfor vertical lifting. When lifting the recloserfor mounting or any other purpose, followapproved safety practices, lift the loadsmoothly and do not allow it to shift.

14

Figure 16.Mounting dimensions for KFE and KFVE reclosers.

MountingDIRECT MOUNTINGType KFE and KFVE reclosers can bemounted directly to a substation struc-ture or frame if adequate electrical andphysical clearances can be allowed(Figure 16). The recloser should bemounted using 1,59 cm (5/8 in.) diame-ter mounting hardware which must befurnished by the customer. Whenmounting the recloser on a flat surface,be sure to use adapter plates (shippedwith recloser) between the tank lugsand the flat surface.

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KFE10002-E

Figure 17.Mounting and clearance dimensions for pole mounting extension hanger.

POLE MOUNTINGKFE and KFVE reclosers can be polemounted by using the pole-mountingextension hanger shown in Figure 17.Hardware to attach the extension hangerto the recloser is included with the hang-er. Be sure to use flat-surface adapterplates between recloser tank lugs andextension hanger lugs. Hardware tomount on the pole must be furnished bythe customer.

16

Figure 18.Mounting and clearance dimensions for KFE/KFVE recloser with KRK942F Substation Elevating Structure.

SUBSTATION ELEVATING STRUCTUREKFE and KFVE reclosers can be substa-tion mounted by using the KRK942FSubstation Elevating Structure shown inFigure 18. Hardware to attach the recloserto the elevating structure is furnished withthe structure. Hardware to anchor thestructure must be furnished by the cus-tomer.

A series of mounting holes, spaced 7,6cm (3 in.) apart at the upper end of eachidentical extension leg permits varying therecloser height.

17

Figure 19.Typical recloser installation with cross-arm mounted bypass switches.

Figure 20.Typical recloser installation with inlinebypass switches.

KFE10002-E

MAIN WIRING CONNECTIONSFOR INSTALLATION

Bypass SwitchesIt is suggested that KFE and KFVEreclosers installation be provided withbypass and disconnect switches for mainte-nance ease. Figure 19 illustrates a typicalinstallation with crossarm mounted by-passswitches and Figure 20 illustrates an instal-lation with inline bypass switches.

18

Figure 21.Typical recloser connections with bypass and disconnect switches and surge protec-tion on source and load sides.

Surge ProtectionReclosers operate best when protectedwith surge arresters. on line applications,surge protection is recommended on bothsides of the recloser. If protection is to beprovided on one side only, install thearresters on the source side. In substa-tions, arresters are located on the loadside. Figure 21 illustrates a protectionscheme for reclosers, including surgearresters.

GroundingThe recloser ground connector, located onthe recloser tank near the bottom (Figure17) will accommodate two no.10 solidthrough no. 2 stranded conductors.

Another ground connector is provided atthe bottom of the electronic control cabinet(Figure 17) for connecting a no. 14 throughno. 4 stranded grounding cable to the sub-station elevating structure or to other suit-able ground if the control is remotelymounted.

Connect the ground in accordance withutility standards.

High VoltageBushing terminals are universal clamptype connectors which accept no. 6through 350 MCM conductors. Highvoltage line connections must be madeto recloser bushing terminals in accor-dance with “SOURCE” and “LOAD”markings on the head casting.

CAUTIONForcing the closing tool beyond themechanism stop may shear the pin onthe closing shaft.

CAUTIONSource leads MUST be connected toterminals 1,3 and 5 marked"SOURCE" on the head casting toprovide operating energy for the highvoltage closing solenoid. The closingsolenoid is connected between termi-nals 1 and 5 during a closing opera-tion.

PLACING RECLOSERIN SERVICEAlways follow approved local practice whenplacing recloser in service. With the reclos-er connected as shown in Figure 21 andsource side high voltage lines energized,the recloser can be placed in service. Movethe yellow manual operating handle underthe sleet hood to the “CLOSE” position asindicated by the Contact-Position Indicatoron the sleet hood. The recloser shouldimmediately close. Block ground by meansof the ground-trip disabling switch. Closethe load side disconnect switch and openthe bypass switch. Then, open the ground-trip disabling switch. The recloser is now inservice. To remove from service, blockground and then close the bypass switchand open the disconnect switches. To pre-vent a trip operation, always block groundwhen bypassing the recloser when phasesare temporarily unbalanced.

Manual Operation ofEnergized RecloserTo manually operate an energized recloserinvolves only a hookstick engagement ofthe yellow operating handle located underthe sleet hood. When the handle is pulleddown, the mechanism is tripped to openthe main contacts. When the handle ispushed up, the closing solenoid is ener-gized to latch the main contacts in theclosed position.

Manual Operation ofDe-energized Recloser

A manual closing tool (KA90R) is used forclosing a de-energized recloser. Removethe pipe plug on the side of the covercasting to provide access for the closingtool to engage the main operating shaft ofthe recloser mechanism. A de-energizedrecloser is tripped open merely by pullingdown the yellow operating handle.

Use the following procedure for manualslow closing of a de-energized recloser:1. Make sure yellow handle is in the

closed position.2. Remove pipe plug in side of recloser

head and insert closing tool.

WARNINGNever use a manual closing tool to closean energized recloser.

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KFE10002-E

CAUTIONBe sure to replace the pipe plug in thehead casting before placing the recloserin service.

CAUTIONSolidly ground recloser to a suitableearth ground.

CAUTIONDo not energize the recloser out of oil.

CAUTIONDo not attempt to trip a recloser usinga dc source such as a storage battery.The vacuum interrupters may beseverely damaged if interruption of thedc arc is attempted.

IMPORTANT:When testing phase minimum-trip cur-rent, be sure to disable ground-tripfunction. Testing on individual phaseswithout disabling ground-trip will causethe ground-trip function to operate.

Figure 22.Using a KA90R manual reclosing tool to operate the recloser.

82059KMA

3. Engage the main operating shaft, androtate the tool about 1/4 turn clockwiseto close the recloser contacts. Avoidforcing the closing tool beyond thestop; doing so may shear the pin onthe closing shaft.

4. A de-energized recloser can be trippedopen merely by pulling the yellow oper-ating handle down.

Non-Reclosing OperationWhen the non-reclosing lever has beenmanually pulled down into the nonreclos-ing position, any current over minimum-trip rating will cause a mechanical linkageto automatically lock open the recloser onthe first trip operation instead of cyclingthrough the normal operating sequence.This immediate lockout protection isespecially important for hotline work.

The non-reclosing lever does not inter-fere with manual recloser operation. Therecloser can be opened or closed manu-ally regardless of the position of the non-reclosing lever.

In-Service RecloserOperationWhen the recloser is closed and in ser-vice, it operates automatically as overcur-rent conditions demand. However, oncelocked-out it must be manually closed byreturning the yellow handle to its up(closed) position.

TESTINGType KFE and KFVE reclosers are care-fully tested and adjusted at the factory tooperate according to the published data.Well equipped test facilities, a detailedtesting procedure, and trained personnelassure accurate calibration. Permanentrecords are kept of each recloser’s testperformance. Thus, each recloser leavesthe factory ready for installation, and pre-installation testing is not necessary.

However, should verification of recloseroperation be desired prior to installation,the following characteristics can bechecked:1. Number of operations to lockout.2. Number of fast openings.3. Satisfactory operation of closing

solenoid.4. Minimum-trip current.5. Reclosing time.6. Operation of the non-reclosing

feature.

The test findings should agree with theinformation shown on the data plateslocated on the sleet hood of the recloser.The recloser can be test tripped with alow-voltage ac source, however for auto-matic closing a high-voltage ac source isrequired. For personnel safety the reclos-er and high-voltage transformer shouldbe enclosed in a test cage to preventaccidental contact and all grounding pre-cautions should be observed. All meter-ing and measuring equipment should belocated outside of the test cage.

20

Figure 23.Suggested test diagram for low-voltage tripping, high-voltage closing.

Test Equipment RequiredA suggested test circuit is shown inFigure 23. The following equipment isrequired for this circuit:

1. Variable autotransformer — 240 Volts,20 amps.

2. Low-voltage transformer T2—Ratioand kVa size depend upon size ofrecloser trip coil and maximum currentto be used.

3. Ammeter — Full scale deflection shouldbe at least 300% of reclosing rating. Useof current transformer may be required.

4. Cycle counter — or other timing device.5. High-voltage transformer T1—Used to

operate high-voltage closing solenoid. Ingeneral, a 50-kVa transformer having animpedance of about three percent willbe satisfactory if the source impedanceis reasonably low. Low-side ratingshould equal voltage of available testsource. High-side should equal voltageof recloser’s closing solenoid. Be sureminimum allowable voltage shown inTable 10 is maintained at recloser termi-nals during the two- to three-cycle inter-val the closing solenoid is energized.

Test Procedures—ElectricalClosing

WARNINGSolidly ground leads X and Z and inter-connect to the recloser tank. DO NOTconnect leads W and Y to the SAMEPHASE. Dangerous voltages to groundexist on the phase connected to Y.

OPERATION OF CLOSINGSOLENOIDAssemble and connect the equipment asshown in Figure 23.1. Trip the recloser manually by moving

manual operating (yellow) handle downto “LOCKOUT” position, then move theyellow handle up to its “CLOSED” posi-tion.

2. Energize the high-voltage transformerT1. The recloser should close immedi-ately, indicating correct operation of theclosing solenoid.

Table 10Closing Solenoid Electrical Constants and Minimum Voltage

Closing Closing Minimum AllowableSolenoid Solenoid Voltage at Recloser

Rating Code When Solenoid is(kV) Number Energized-(Volts)

50-Hz6.0 51 510011.0 52 935013.2 53 1122014.4 54 12240

60-Hz2.4 21 2040

4.16-4.8 22 35406.0 31 5100

12.0-13.2 30 1020014.4 27 1224020 29 17000

23-24.9 33 19550

21

KFE10002-E

PHASE MINIMUM-TRIP CURRENTWhen testing phase minimum-trip level,block ground by lowering ground disablehandle.

“A” Phase (Bushings 1 and 2)Connect leads X and W from low-voltagetransformer T2 to bushing terminals 1and 2 respectively, and proceed as fol-lows:1. Program one or more “A” trip charac-

teristics.2. With manual operating handle in its

“CLOSED” position, energize high-voltage transformer T1 to close therecloser.

3. De-energize transformer T1.4. Energize variable autotransformer and

slowly raise the voltage from zero,noting the ammeter reading. If currentis raised gradually when tripping onan “A” trip characteristic, the mini-mum-trip is essentially that current atwhich the trip occurs.

5. Lower the yellow handle to lockoutthe recloser. This will cancel countaccumulation so that subsequentoperation will be on first “A” curvecharacteristic.

“B” Phase (Bushings 3 and 4)Connect leads X and W from low-voltagetransformer T2 to bushing terminals 3and 4 respectively, and repeat Steps 1,2, 3, 4 and 5 above.

“C” Phase (Bushings 5 and 6)Before applying any voltage to “C” Phasereverse the high-voltage transformerleads; connect grounded lead Z toBushing 5 and hot lead Y to Bushing 1.Then connect the low-voltage trans-former test leads X and W to Bushings 5and 6 respectively, and repeat Steps 1,2, 3, 4 and 5 above.

GROUND MINIMUM-TRIP CURRENTAccurate minimum-trip is best obtained ifthe first ground-trip characteristic is #1inverse, or #1, 2, or 3 constant time.Slower tripping characteristics requirevery gradual increase in current. Usefastest time available. Connect leads Xand W on low-voltage transformer T2 toone pair of bushing terminals (1 and 2,or 3 and 4, or 5 and 6) and use the fol-lowing procedure:1. Set the Ground-Trip Disabling Switch

to "NORMAL" (up) position.2. Move the yellow manual operating

handle to its closed position and usethe manual closing tool to close therecloser.

3. Energize the variable autotransformerand slowly raise the voltage fromzero. Note the ammeter reading whenthe recloser trips and compare toplug-in trip resistor value.

OPERATING SEQUENCE ANDRECLOSING TIME—PHASEWith the test circuit connected as shownin Figure 23 and ground blocked by low-ering the Ground Disable Handle, pro-ceed as follows:1. Move the yellow manual operating

handle to its “CLOSED” position andenergize the high-voltage transformerT1 to close the recloser. Leave T1

energized.2. Set the variable autotransformer high

enough to cause the recloser to tripreadily (suggest 150 to 300 percentminimum-trip resistor current rating).

3. Energize the low-voltage transformerT2. The recloser should trip, reclose,and continue tripping and reclosingthrough its programmed sequence tolockout.

4. Observe the following:A. Count the number of fast opera-

tions by watching the ContactPosition Indicator on the sleethood.

B. Read reclosing time from the tim-ing device arranged to record theperiod during which the current isnot flowing.

C. Count the number of operations tolockout by counting the trip opera-tions until the yellow handle drops.

OPERATING SEQUENCE ANDRECLOSING TIME—GROUNDThe verification of ground operatingsequence is similar to phase except thatthe Ground Disable switch must beopened and the preset fault must bebelow phase minimum-trip.

With the test circuit connected asshown in Figure 23, proceed as follows:1. Move the yellow manual operating han-

dle to its “CLOSED” position and energ-ize the high-voltage transformer T1 toclose the recloser. Leave T energized.

2. Set the variable autotransformer highenough to cause the recloser to tripreadily (make sure the setting is belowphase minimum-trip resistor currentrating).

3. Energize the low-voltage transformerT2. The recloser should trip, reclose,and continue tripping and reclosingthrough its programmed sequence tolockout.

4. Observe the following:A. Count the number of fast operations

by watching the Contact-PositionIndicator on the sleet hood.

B. Read closing time from the timingdevice arranged to record the peri-od during which the current is notflowing.

C. Count the number of operations tolockout by counting the trip opera-tions until the yellow handle drops.

OPERATION OF NON-RECLOSINGLEVERWhile testing on any phase as previouslydescribed, operation of the nonreclosingfeature can be checked, as follows:1. Pull down the non-reclosing lever.2. Repeat test steps 1, 2 and 3 in the

“Operating Sequence and ReclosingTime-Phase” section.

3. The recloser should not reclose afterthe first trip operation and the yellowhandle should drop indicating recloserlockout.

IMPORTANT:When repeating tests, be sure to allowenough time for the lockout integratorpiston to reset. Time required isappromimately 1.5 minutes per reclos-er trip operation. Fast resetting of inte-grator occurs immediately followinglockout. Yellow handle can be raisedafter approximately 5 seconds (atroom temperature).

Figure 24.Bushing Current Transformer accessorymounted on recloser bushings.

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IMPORTANT:After each recloser trip, approximatelytwo seconds elapse (reclosing time)while the closing solenoid plunger ismoving upward. Near the end of thistime period two metallic clicks will beheard. The first is the main toggle latchresetting; the second is the closingsolenoid contactor closing. As soon asthese clicks are heard, the closing toolcan be turned to close the recloser.

CAUTIONThe recloser is shipped with each BCTsecondary shorted with a jumper wirebetween terminals X1 and X5. Do notremove the jumper wire until externalconnections to the CT's have been com-pleted. Energizing the recloser with thejumper wire removed and the CT's notconnected may generate dangerous volt-ages in the CT secondaries.

Test Procedures—Manual ClosingThe manual closing tool (Figure 22) per-mits manual closing of the main contactsof the recloser for test purposes, when ahigh voltage source for closing is notavailable. Minimum-trip current and oper-ating sequence can be tested in thismanner.

Refer to instructions covering “ManualOperation of De-energized Recloser” forclosing procedure when using the manu-al closing tool. The best procedure is tohave one person operate the closing toolwhile another regulates the tripping cir-cuit and observes test results.

PHASE MINIMUM-TRIP CURRENTWhen testing phase minimum-trip level,block ground by lowering Ground Disablehandle.

“A” Phase (Bushings 1 and 2)Connect leads X and W from low-voltagetransformer T2 to bushing terminals 1and 2 respectively, and proceed as fol-lows:1. With manual operating handle in its

“CLOSED” position, manually closethe recloser.

2. Energize the variable autotransformerand slowly raise the voltage fromzero, noting the ammeter reading atwhich tripping occurs.

“B” Phase (Bushings 3 and 4)Connect leads X and W from low-voltagetransformer T2 to bushing terminals 3and 4 respectively, and repeat Steps 1and 2 above.

“C” Phase (Bushings 5 and 6)Connect leads X and W from low-voltagetransformer T2 to bushing terminals 5and 6 respectively, and repeat Steps 1and 2 above.

GROUND MINIMUM-TRIP CURRENTAccurate minimum-trip is best obtained ifthe first ground-trip characteristic is #1inverse or #1, 2, or 3 constant time.Slower tripping characteristics requirevery gradual increase in current. Usefastest trip available.

Connect leads X and W on low-voltagetransformer T2 to one pair of bushing ter-minals (1 and 2, or 3 and 4, or 5 and 6)and use the following procedure:1. Set the Ground-Trip Disabling Switch

to”NORMAL” (up) position.2. Move the yellow manual operating

handle to its closed position and usethe manual closing tool to close therecloser.

3. Energize the variable autotransformerand slowly raise the voltage fromzero. Note the ammeter reading whenthe recloser trips and compare toplug-in trip resistor value.

RECLOSER ACCESSORIESThe Type KFE and KFVE reclosers canbe equipped with a number of factory-installed accessor ies which aredescribed on the following pages. Powerrequirements, connection instructionsand adjustments where needed are alsodescribed.

Extra Creepage BushingsWhen KFE reclosers are to be installedwhere extensive salt spray, smog, smokeor other atmospher ic contaminantsreduce the effectiveness of porcelaininsulation, Extra Creepage Bushings(KRK288FC) can be supplied. StandardType KFE recloser bushings provide 29,6cm (11-5/8 in.) of creepage; extra creep-age accessory bushings provide 43,2 cm(17 in.).

Bushing-Type Multi-RatioCurrent TransformersA set of three 600:5 multi-ratio currenttransformers for operating relays or loadmeters can be factory installed externallyon the source side bushings (Figure 24).The accessory includes three currenttransformers, conduit, fittings and factorywiring to a terminal block mounted in aweatherproof junction box. Taps on thesecondary winding provide the differentratios. The available ratios and their cor-responding terminal connections areshown in Table 11. The terminal arrange-ment for the tapped secondary (Figure25) is accessible when the cover plate onthe transformer housing is removed.

82083KMA

Table 11Bushing-Type Current TransformerRatios and Terminal Connections

TerminalRatio Connection

600:5 X1-X5500:5 X2-X5450:5 X3-X5400:5 X1-X4300:5 X2-X4250:5 X3-X4200:5 X4-X5150:5 X1-X3100:5 X1-X250:5 X2-X3

Figure 25.Bushing Current Transformer secondarywinding taps are located in the trans-former housing.

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KFE10002-E

82086KMA

82084KMA

83459KMA

Figure 26.Bushing Current Transformer secondarytap wired to junction box for custmerconnections.

Figure 27.BCT Junction Box dimensions and posi-tion of shorting thumbscrews in terminalblock when shipped to customer.

Figure 28.Accessory-Connection Junction Box(KRK433FB) with cable receptacles forconnection to recloser and Remote-Closeaccessory.

Bushing CurrentTransformer ConnectionsCustomer connections to the secondarytaps are made in the Bushing CurrentTransformer Junction Box as shown inFigure 26.

Figure 27 shows the shorting thumb-screws in the BCT terminal block “asshipped” and provides instructions formoving the thumbscrews in order to putthe accessory in operation. Note that inthe “as shipped” condition, the 1, 3, and 5terminals are each short-circuited to thegrounding bar with a thumbscrew. Afterexternal connections are made, the threethumbscrews are removed and stored inthe corners of the terminal block. Theround-head machine screw remains inthe COM terminal position.

Accessory-ConnectionJunction BoxThe Accessory-Connection Junction Box(KRK433FA or KRK433FB) must beincluded when KFE reclosers are to befurnished with one or more of the follow-ing accessories: Auxiliary Switch,Lockout-lndicating Switch, Remote-Trip,Remote-Lockout, Remote-Close, or Low-Voltage Closing.

When the recloser includes Remote-Close in addition to one of the otheraccessories, the KRK433FB (Figure 28)Junction Box must be specified.

The Junction Box provides a convenientsingle location for connection of customerremote operating and indicating circuits(Figure 29). The KRK433FA Junction Boxincludes a six-foot-long cable for intercon-nection of recloser and junction box. TheKRK433FB includes an additional cablefor connection to the Remote-Close

Figure 29.Dimensions and accessory-connectionlocations in Accessory Junction Box.

Figure 31.Lockout-Indicating Switch KRK412FAmounted on side of recloser mechanism.

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Auxiliary SwitchRemote indication of recloser contactposition can be accomplished with theAuxiliary Switch accessory KRK411FA(Figure 30). The contacts of the AuxiliarySwitch can also be used to switch othercircuits in accordance with the openingand closing of the recloser contacts. Theauxiliary switch is mounted on the side ofa KFE or KFVE recloser mechanismframe.

A two-stage switch is provided; eachstage contains one single pole doublethrow isolated set of contacts—”a” and“b”. When the recloser contacts are open,the “a” contacts are also open and the “b”contacts are closed. The relationshipbetween the auxiliary switch and reclosercontacts is shown in Table 12. The con-tacts cannot be changed. Auxiliary switchinterrupting ratings are shown in Table13.

82253KMA

Table 12Auxiliary Switch Contact Position

Table 13Interrupting Ratings of Auxiliary Switch

Table 14Lockout Switch Contact Position

Recloser Contacts Open ClosedAuxiliary “a”contacts are Open ClosedAuxiliary “b”contacts are Closed Open

Customer connections to auxiliaryswitch contacts are made in theAccessory Connection Junction Box asshown in Figure 29. one stage (Terminals8, 9 and 10 in Figure 29) is employed inthe switching of the Remote-Trip acces-sory; however, the second stage of theAuxiliary Switch (Terminals 5, 6 and 7 inFigure 29) is available for customer use.NOTE: If Remote-Trip Accessory (KRK410) isincluded with the recloser, one stage of theauxiliary switch is connected into that acces-sory, allowing only one stage for customeruse.

Volts Current(amps)

120 ac 15240 ac 1524 dc 248 dc 3/4

125 dc 1/2250 dc 1/4

Lockout-Indicating SwitchThe Lockout-lndicating Switch accessoryKRK412FA, shown in Figure 31, is availableon KFE and KFVE reclosers to provide afacility for remote indication that the recloserhas locked-out. The accessory is useful inload-transfer schemes and other applica-tions when lockout of one recloser may initi-ate the closing of another.

A two-stage switch is provided; each stagecontains one single pole double throw isolat-ed set of contacts—”aa” and “bb”. When therecloser is locked-out, the “bb” contacts areclosed and “aa” contacts are open. SeeTable 14 for relationship of recloser and indi-cating switch contacts. The contacts cannotbe changed. Interrupting ratings of theLockout-lndicating Switch are shown in Table15.

Locked- Not LockedRecloser Contacts Out Out

Indicating Switch Open Closed"aa" contacts areIndicating Switch Closed Open"bb" contacts are

Customer connections to Lockout lndicat-ing Switch contacts are made in theAccessory-Connection Junction Box asshown in Figure 29. One stage (Terminals14, 15 and 16 in Figure 29) is employed inthe switching of the Remote-Lockout acces-sory; however, the second stage of theLockout-lndicating Switch (Terminals 11, 12and 13 in Figure 29) is available for cus-tomer use.NOTE: If Remote-Lockout accessory KRK409 isincluded with the recloser, one stage of theLockout-indicating Switch is connected into thataccessory, allowing only one stage for customeruse.

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KFE10002-E

83458KMA

82087KMA82087KMA

Table 15Interrupting Ratings of Lockout-Indicating Switch

Table 16Remote-Trip Accessory Ratings

Table 17Remote-Lockout Accessory Ratings

Table 18Electrical Ratings of the Remote-Close Accessory

Volts Current(amps)

120 ac 15240 ac 1524 dc 248 dc 3/4

125 dc 1/2250 dc 1/4

Figure 32.Remote-Trip accessory KRK410F mount-ed on side of recloser mechanism.

Figure 33.Remote-Lockout accessory KRK409Fmounted on side of recloser mechanism.

Figure 34.Remote-Close accessory KRK414FBmounted on KFE recloser sleet hood.

Remote-Trip AccessoryRecloser trip operations can be triggeredfrom a remote location by energizing theRemote-Trip accessory KRK410F(Figure 32) through an external supplycircuit. Automatic reclosing will occur, therecloser will count the operation, andsequencing will occur in the same man-ner as if the electronic control had oper-ated.

A two-stage auxiliary switch is provid-ed as part of the Remote-Trip accessory.One stage is employed in the switchingof the Remote-Trip accessory; the sec-ond stage—to which connections aremade at Terminals 5, 6 and 7 in theJunction Box accessory—is available forcustomer use. Ratings of the Remote-Trip accessory are shown in Table 16.

External circuit connections to theRemote-Trip accessory are made in theAccessory-Connection Junction Box asshown in Figure 29.

Rated CurrentCatalog Voltage RequiredNumber (Volts) (amps)

KRK410FA 24 ac 7.024 dc 2.0

KRK410FB 48 ac 3.548 dc 1.0

KRK410FC 120 ac 1.8125 dc .5

KRK410FD 240 ac .9250 dc .25

Rated CurrentCatalog Voltage RequiredNumber (Volts) (amps)

KRK409FA 24 ac 7.024 dc 2.0

KRK409FB 48 ac 3.548 dc 1.0

KRK409FC 120 ac 1.8125 dc .5

KRK409FD 240 ac .9250 dc .25

Total time is open recloser contactsusing the Remote-Trip accessory is 0.033seconds (or 2 cycles on a 60-Hz basis).

Remote-LockoutAccessoryWhen energized from an externalsource, the Remote-Lockout accessoryKRK409F (Figure 33) will cause therecloser to trip and its mechanism to lockout. The recloser’s yellow manual operat-ing handle will drop to its lockout posi-tion, providing a visual indication that therecloser is locked-out.

Closing from lockout can be accom-plished manually by moving the yellowhandle up to its closed position, orremotely with the Remote-Close acces-sory. Remote-Lockout and Remote-Close accessories are often applied onthe same recloser to enable remote con-trol of lockout and closing.

External circuit connections to theRemote-Lockout accessory are made inthe Accessory-Connection Junction Boxas shown in Figure 29.

A two-stage Lockout-lndicating Switchis provided as part of the Remote-Lockoutaccessory. One stage is employed in theswitching of the Remote-Lockout acces-sory; the second stage—to which connec-tions are made at Terminals 11, 12 and 13in the Junction Box accessory—is avail-able for customer use. Operation and rat-ings of the Lockout-lndicating Switch arethe same as described for the Lock-out-lndicating Switch accessory. Table 17shows the ratings of the Remote-Lockoutaccessory.

Time to open recloser contacts andlockout the mechanism using theRemote-Lockout accessory is 0.05 sec-onds (or 3 cycles on a 60-Hz basis).

Remote-CloseAccessoryWhen energized from an external source,the Remote-Close accessory KRK414FB(Figure 34) initiates a closing operation bymoving the recloser’s yellow manual oper-ating handle to its closed position. Thisactuates the closing solenoid contactor toenergize the solenoid and close therecloser.

The Remote-Close solenoid is rated forintermittent duty, and accordingly shouldbe energized only with a threewire supplyincluding a normally open momentarycontact. When the contact is closed, arelay is energized which closes the circuitto the accessory motor. On completion ofthe closing operation, switches restore theaccessory circuits in preparation for thenext closing signal.

External circuit connections are madein the Accessory Junction Box as shownin Figure 29 on reclosers equipped withaccessories in addition to Remote-Close.When other accessories are not includedon the recloser, the Accessory JunctionBox is not required and customer connec-tions for the Remote-Close accessory aremade directly to the accessory.

Remote-CloseDescription Accessory KRK414-B

Voltage 120-VacCurrent Inrush 1.25 ampsCurrent;Steady State 0.5 ampOperating Time 2 sec.

Figure 35.Low-Voltage Closing accessoryKRK54FA mounted on side of reclosermechanism.

Figure 36.Instantaneous Trip accessory KRK55F.

Figure 37.Instantaneous Trip acoordination with ahigh-side fuse.

26

Low-Voltage ClosingAccessoryWhen the proper closing coil is specifiedand a Low-Voltage Closing accessoryKRK54FA or B (Figure 35) is included,the KFE or KFVE recloser can employlow voltage ac closing. The Low-VoltageClosing accessory provides the alternateclosing solenoid contactor and the facto-ry-installed wiring to accommodate thelow-voltage closing power. A separatestep-down transformer is also utilized toinsure that sufficient voltage is present tocharge the trip capacitors under low-volt-age closing. Customer low-voltage poweris connected in the Accessory-Connection Junction Box as shown inFigure 29. Reclosing time using the Low-Voltage Closing accessory is the sameas listed earlier under “Operating Times”

CONTROL ACCESSORIESA number of factory-installed accessoriesare available to extend the operating flexi-bility of the KFE or KFVE electronic con-trol and broaded its application capabili-ties. The following sections describe theoperation and use of the plug-in accesso-ry components.

Instantaneous TripAccessory The Instantaneous Trip accessoryKRK55F (Figure 36) extends the range ofa KFE or KFVE recloser coordinationwith source-side devices at higher faultlevels. Above a predetermined fault level,the accessory bypasses the programmedtime-current characteristics to cause therecloser to trip immediately without inten-tional time delay. For fault currents belowthis actuation level, the control operatesaccording to its normal programmed tripcharacteristics.

Actuating levels are based on multiplesof the minimum-trip current settings ofthe control—2, 4, 6 or 3 times the normaltrip level. Separate phase and groundmultiple selections are made by push-ontabs located on the accessory circuitboard.

The Instantaneous Trip accessory isoperational on all shots in the operatingsequence, unless the “Block” feature isselected. The phase and ground “Block”selection cancels all accessory opera-tions. Phase or ground may be separate-ly blocked, or they may both be blockedat the same time. The “Block” feature isoperational on all shots in a sequencewhen it is selected.

The Instantaneous Trip accessory con-sists of a plug-in circuit board thatmounts on the back panel inside theelectronic control. There are no connec-tions external to the control.

Coordination of a recloser equippedwith Instantaneous Trip and a sourcesidefuse is shown in Figure 37. With therecloser operating normally on itsdelayed TCC curve, coordination with theprimary fuse will be lost at fault levelsabove approximately 2000 amps.However, with the Instantaneous Tripaccessory set for a multiple of 4, therecloser will trip instantly at any fault levelabove 1600 amps and extend recloser-fuse coordination up to the maximuminterrupting level of the recloser.

83488KMA

82085KMA

Table 19Low-Voltage Closing Accessory Ratings

Rated Current Closing CoilCatalog Voltage Required CodeNumber (Volts) (amps) Number

KRK54FA 120 ac 40 26KRK54FB 240 ac 25 28

27

KFE10002-E

Another application of theInstantaneous Trip accessory is dia-grammed in Figure 38. With the accesso-ry set for a multiple of 4, a fault at F1would initiate instantaneous tripping forfault currents above 1600 amps. The faultwould be sectionalized by the sectionaliz-er which requires only momentary cur-rent interruption to activate its countingmechanism.

A fault at F2, however, will not activateinstantaneous tripping because the maxi-mum available fault level is below 1600amps. The recloser will operate on itsprogrammed 2A 2C sequence and thedelayed curve will allow the fuse to clearthe fault.

Fault-Indicator TargetAccessoryFault indication of phase-to-ground,phase-to-phase, or three-phase faults isprovided with the Fault-lndication Targetaccessory KRK52F (Figure 39). Theaccessory consists of a plug-in circuitboard that mounts on the back panel ofthe control and an annunciator circuitboard that mounts inside a window onthe bottom of the control cabinet.

The annunciator-type target shows anorange dot in the appropriate phase orground window visible through the bot-tom of the control cabinet when the con-trol trips due to an overcurrent. The tar-gets reset automatically when the faultcondition is cleared, or when reclosureoccurs.

Sensitive Earth FaultAccessoryThe Sensitive Earth Fault (SEF) acces-sory KRK1211F allows the KFE recloserto sense and trip on SEF faults to allowcoordination with upline interruptingdevices also equipped with SEF protec-tion. The accessory is contained on amodified ground trip TCC card.

The pick up levels for the SEF acces-sory is fixed at 25% of the standardground fault trip level, but not less than 1Amp. The time to trip for the SEF acces-sory is from 1-16 seconds, adjustable inone second increments, using a DIPswitch located on the TCC card.

The SEF accessory also has a blockswitch which is located on the TCC card.

The SEF modified TCC card will func-tion correctly when located in either theTCC 1 or TCC 2 card position in the con-trol.

If Fault-lndicator Target accessory isinstalled, a SEF trip will register as aphase-to-ground fault.

The SEF accessory effectively clampsthe current at which the control will tripfor all ground faults. For example, if theSEF accessory is set to trip at five sec-onds and the inverse TCC for ground is13 seconds at minimum trip the inversecurve timing cannot be longer than 5seconds. Once the curve timing is lowerthan 5 seconds the time to tr ip willresume following the inverse curve.

Figure 39.Fault-Indication Target accessory KRK52F.

Figure 38.On a load-side fault, instanteous trippingoccurs at high-current fault (F1) with nor-mal coordination at F2 to allow the fuseto sectionalize.

83489KMA

KTM1/96

©1995 Cooper Power Systems, Inc.Kyle® is a registered trademark of Cooper Industries, Inc.

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