Eaton VisoVac Instruction Manual

1615kV Class Padmount VisoVac™instruction manual MN024004EN April 2021ote:N It may not be possible to complete steps 3 and4 without de-energizing the upstream device. Inthis case, step 3 and 4 can be skipped.4. Open the Ground mechanism.5. Close the Isolation mechanism.6. Close the vacuum interrupter.It is recommended not to remove any covers from theVisoVac interrupter while the assembly is in service. If anyfasteners are loosened, the quality of the enclosure will becompromised. If any repair is necessary, it is recommendedthat the assembly be taken out of service and moved intoa controlled maintenance environment. If any cover isremoved for maintenance, new gasketing is required forreassembly. The following list provides a list of cleaning,testing and maintenance tasks for the vacuum interrupterand related equipment.● Operation of breakers: After step 1 above, clean VCPT asper the linked manual.https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/medium-voltage-vacuum-circuit-breakers/mv-vcp-t-vacuum-circuit-breakers/vcp-t-vcp-tr-instruction-book-ib131016en.pdf● Heaters/thermostats: Heathers and thermostat shall becleaned after opening of interrupter.● Dielectric testing: Once the unit has left the factoryand been placed in service, subsequent dielectric testsperformed during maintenance should be performed at75% of the rating per IEEE recommendation.● Follow these steps to perform the Pre-Startup inspection:● Inspect the equipment visually.● Make sure all connections are tightened and all coversare closed before moving to next step.● Make surroundings neat and clean to prevent trip-and-fall injuries.Safety featuresThere are several safety interlocks built into the VisoVacassembly to ensure the proper sequence of operations.1. Vacuum interrupter to Isolating mechanism interlock(V3 designs only)a. The vacuum interrupter is mechanically interlockedwith the Isolating mechanism.b. The vacuum interrupter will not close unless theisolating rods are in the fully connected position.c. If a tool is placed on the isolating rod mechanism,the vacuum interrupter will trip open before anyelectrical contact is broken.2. Isolation mechanism to ground mechanisma. The isolating mechanism is mechanicallyinterlocked with the ground mechanism.b. When the isolating rods are in the connectedposition, the ground rods are blocked from movingand remain blocked until the isolating rods are inthe fully open position.c. When the ground rods are in the connectedposition, the isolating rods are blocked frommoving and remain blocked until the ground rodsare in the fully open position.3. Ground mechanism to upstream devicea. It is imperative that there be no voltage present onthe cable bushings before closing the ground rods.b. Since this requires opening the upstream devicethat may be blocks or even miles away, it isrecommended that the user deploy their Lock-out/Tag-out and/or operational procedures to ensure novoltage is present before closing the ground rods.4. Arc reduction maintenance system (ARMS)(Digitrip 1150V only)a. When the Arcflash Reduction Maintenance Systemis enabled, the internal digital logic is bypassed bya “faster than instantaneous” analog trip circuitbased on user preset values. In this mode, theDigitrip is set to hair trigger and issues subcycletripping. Total clear is estimated within 4 cycles.b. Eaton’s Arcflash Reduction Maintenance Systemtechnology is based on the realization that whenworking on energized electrical equipment, a faultthat occurs within the gear or downstream needsto be cleared as quickly as possible. While thisseems obvious, in actual installations, intentionaldelays are included in upstream devices to ensureselective coordination with downstream devices.This means that if a fault were to occur inside theequipment the downstream breaker may neverclear the fault regardless of how much delay is orisn’t programmed in the upstream device. Whileother Eaton Arcflash technologies are available, theArcflash Reduction Maintenance System comesstandard with the Digitrip 1150 V. This patentedtechnique provides “faster than instantaneous”clearing times.See the following link for literature on the Digitrip 1150VARMS functionality:https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/medium-voltage-vacuum-circuit-breakers/mv-vcp-t-vacuum-circuit-breakers/digitrip-1150v-with-maintenance-mode-il66a7535.pdf

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