Eaton VFI Installation, Operation And Maintenance Instructions

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Eaton VFI Installation, Operation And Maintenance Instructions Manual pdf 11 page image

7Type VFI, Fluid-insulated SwitchgearINSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS MN285006EN March 20183. Perform the following inspectionse:● Check fluid level – refer to the Fuid fill guidelines inthis manual if fluid levels are low.otee:N When the switchgear is installed on a levelsurface, the ball float in the fluid level indicatorsight gauge on the front plate will be at the topof the site glass when fluid temperatures are68 ºF (20 ºC) or higher. Colder temperaturesand/or an uneven pad will result in the gaugeindicating less than maximum fluid levels.● Inspect tank cover – the tank cover should be free ofchipped paint and corrosion. If a crack or hole is found,obtain a fluid sample and check moisture content anddielectric strength immediately. If a replacement coveror cover gasket is needed, refer to the Replacementparts section of this manual.● Inspect tank exterior for fluid leaks – there shouldbe no fluid staining on or near the tank seals at thebushings, visible break windows and other gasketedseals on the front plates. If fluid stains are present,check the fluid level, and see the Fuid fill guidelinesif more fluid is required. Bushing leaks may be sealedby re-applying torque to the bushing clamp hardware(5 to 6 ft-lbs). Do NOT tighten visible break windowhardware. First check for cracks in the window. Iffound, order replacement window kit. If no cracks,tighten hardware (95 to 105 in-lbs).● Check bushing and elbow conditions – elbowconnections should be secure and free fromunusual wear. Record abnormalities and contact themanufacturer with any concerns.● Inspect tank and cabinets for corrosion or unusualsigns of wear – contact the manufacturer with anyconcerns.● Functionality check – verify that cabinet doors closeand lock properly. Verify manual operation of eachswitch and VFI. Contact the manufacturer with anyconcerns.● Record any other unusual wear/abnormalities –contact the manufacturer with any concerns.Internal inspection and repairIf internal damage is suspected or if the switchgear mustbe opened for inspection, the following procedure isrecommended.1. De-energize and ground switchgear2. Draw a fluid sample Use the drain plug with samplerat the bottom of the tank. If moisture is found in thetank, refill with clean, dry insulating fluid.WARNINGHazardous voltage This equipment must bede-energized and grounded prior to conducting anymaintenance, dielectric fluid processing or dielectricfluid filling procedures Failure to comply can result indeath or severe personal injury T239 23. Clean off tank cover Take appropriate precautionsto keep dirt, moisture, and other foreign matter fromentering tank and contaminating the insulating fluid.4. Remove tank cover5. Inspect for internal damage Check inside theswitchgear for broken leads or loose parts. If anybushings or interrupters are damaged, repair asrequired.6. Bushing repairs The bushings can be changed withthe tank cover removed.A. Lower the fluid level as needed to make repairs.Store the drained fluid according to locally approvedprocedures and in a sealed, clean and dry container.B. Disconnect the internal cables and leads.C. Unbolt external steel clamps from the front plateand replace any damaged bushings or bushingwells with new parts and a new gasket. Be sure toposition gasket so it will seal properly7. Interrupter repairs Contact your local Eatonrepresentative for additional information and orderingprocedures.8. Replace the tank cover New gaskets should be usedwhen re-installing the cover. Refer to the section ofthis manual for further instructions.9. Refill with insulating fluid Refer to the Fluidsampling guidelines and Fluid testing sections of thismanual, and make sure that the unit is properly filled tothe 68 °F (20 °C) fluid fill level with clean, dry insulatingfluid.10. Close and lock doors After repairs are completed,close and lock switchgear doors in order to preventunauthorized access and accidental contact with highvoltage lines.Insulating fluid maintenanceWARNINGThis equipment relies on dielectric fluid to provideelectrical insulation between components The dielec-tric strength and moisture content of the fluid must bechecked on a regular basis, as part of the routine main-tenance inspection, to ensure that it is at or above mini-mum dielectric requirements and below the maximummoisture content Use of this equipment with dielectricfluid that does not meet requirements can result ininternal flashovers that will damage the equipment andcan result in death or serious injury G107 3