Eaton VFI Installation, Operation And Maintenance Instructions

Also see for VFI: Installation and maintenance instructions

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Eaton VFI Installation, Operation And Maintenance Instructions Manual pdf 13 page image

9Type VFI, Fluid-insulated SwitchgearINSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS MN285006EN March 20183. Fluid samples should only be extracted when fluidtemperatures are 59 ºF (15 ºC) or higher. Moistureanalysis results may not accurately reflect the amountof moisture inside the switchgear if samples areextracted when the fluid is below this temperature.4. The container temperature must be equal orgreater than the ambient air temperature to preventcondensation after opening the container.5. Never sample fluid during inclement weather (rain,sleet or snow). The fluid sample could be contaminatedby moisture.6. Always use the drain plug and sampler located nearthe bottom of the front plate of the tank to extract fluidsamples.7. Use only approved, new fluid-resistant tubing (nitrile orsilicone rubber) for sampling the fluid. Use of previouslyused tubing or incompatible materials can result incontamination of the fluid sample. Tube ID required forthe fluid sampling valve is 5/16 inch.8. The fluid sampling valve and cap should be “fingertight”. Use lineman’s pliers or tongue and groove pliersto loosen the cap and/or valve if needed. Fluid shouldstart to flow from the valve after 2 – 3 counterclockwiseturns.otee:N Do not attempt to turn the valve more than 5full turns. The valve will completely uncoupleafter 8 turns and allow fluid to flow freely. If fluiddoes not flow from the valve after 5 turns andthe tank has been de-pressurized, re-tighten thevalve, and contact the manufacturer for furtherinstructions.9. Using a disposable container (not the container that willbe sent to the lab), extract one quart of fluid from thesample valve and discard it as waste.10. Use only glass or extruded metal (solderless) containersto store fluid for laboratory analysis. Plastic containersmust not be used as water vapor can permeate throughplastic and alter the results.11. If dissolved gas analysis is required, the sample mustbe collected using a glass syringe designed for thispurpose.12. Label the sample container with the switchgear serialnumber, sample date and temperature at the time ofextraction.13. Rinse sample container with fluid before extracting asample. Fill sample container with fluid to 1/3 of thecontainer volume, rinse and discard rinse fluid.14. Always fill sample containers to the top to preventambient air from altering the moisture content ofthe sample. Leave about one inch of air space in thecontainer to account for thermal expansion.15. Retighten sampling valve to “finger tight” plus a 1/4turn. Reinstall cap, and leave it “finger tight”.16. Upon completion of sampling, recheck the switchgearfluid level, and add fluid if required.Fuid fill guidelinesThe fluid level indicator sight gauge on the front plate ofthe switchgear provides a convenient method to check fluidlevels. The indicator provides the correct level for fluid at68 °F (20 °C).If the fluid level is low, use the following procedure to adddry insulating fluid to fill the unit to the correct level:1. De-energize and ground the switchgear prior to fluidfilling.2. Use only insulating fluid that complies with ASTMD3487 (latest revision). The fluid must have aminimum dielectric strength of 30 kV when testedper ASTM D877. Never use fluid that contains PCBs(Polychlorinated Biphenyls).3. Use only transfer equipment that uses insulating fluidresistant materials for hoses, seals, valves, pumps, etc.Failure to use proper transfer equipment can result incontamination of the fluid.4. When adding fluid, use the fluid fill plug located on thefront plate of the unit.5. Avoid getting gas bubbles in the fluid during filling. Gasbubbles in the fluid can reduce the dielectric strength.6. When filling is complete, check the fluid level gauge toverify that the fluid is filled to the correct level. Allowat least one hour for gas bubbles to dissipate prior toenergizing the unit.7. Install plug and energize the unit.8. Record the date and the amount of fluid needed tore-fill the unit; retain information with the permanentmaintenance record of the unit.Fluid testingThe insulating fluid in this equipment has been tested tomeet the requirements of ASTM D3487, and it has beenprocessed to remove moisture and dissolved gases. It mustbe tested on a regular basis in order to ensure that it meetsthose requirements.Two types of fluid tests are required to evaluate andmaintain the quality of the insulating fluid. They are generalfluid tests and dissolved gas analysis.General fluid testsThe general fluid test requirements are taken from IEEEStd C57.106™-2002 IEEE Guide for Acceptance andMaintenance of Insulating Oil in Equipment. The requiredfluid tests and acceptable limits for service-aged fluid areshown in Table 2.Fluid test results that do not meet the requirements mayindicate a problem with either the fluid or the unit. Contactyour Eaton representative for technical assistance.

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