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 14 page image

10Type VFI, Fluid-insulated SwitchgearINSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS MN285006EN March 2018Dissolved gas analysisDissolved gas analysis is a useful technique for diagnosingabnormal conditions and assessing the “normal” conditionof insulating fluid in fluid-filled equipment. The methodemployed is ASTM D3612, which is used in conjunctionwith IEEE Std C57.104™-2008IEEE Guide for the Detectionand Determination of Generated Gases in Oil ImmersedTransformers and their Relations to the Serviceability of theEquipment. Table 4 provides recommendations on dissolvedgas levels in fluid insulated switchgear.Table 2 Test limits for service-aged fluidFluid Test Method RequirementDielectric StrengthAcid*Dissipation*Interfacial*Water ContentD877D974D924D971D153326 kV minimum0.20 mg KOH/g maximum1.0% maximum24 mN/m minimumSee Table 3*Requirements shown are for mineral oil only. Service-aged limits for esterfluids have not been established at the time of this publishing.Table 3 Service recommendations for insulating fluid moisture contentsFluid Type Water Content (ppm) Service RecommendationMineral Oil< 25 Continue with Eaton recommended maintenance schedule (inspection and sampling every 2 years).25 – 35 Obtain another fluid sample for moisture analysis in 6 months to determine if moisture levels are rising. Referto the Fluid sampling guidelines section in this manual. If moisture levels increase, determine leakpoint and repair. Process or replace the fluid if water conent has exceeded 35 ppm.> 35 De-energize the equipment immediately. Take another sample and verify results. If verified, process or replacethe fluid before returning to service.FR3< 400 Continue with Eaton recommended maintenance schedule (inspection and sampling every 2 years).400 – 600 Obtain another fluid sample for moisture analysis in 6 months to determine if moisture levels are rising. Referto the Fluid sampling guidelines section in this manual. If moisture levels increase, determine leakpoint and repair. Process or replace the fluid if water conent has exceeded 600 ppm.> 600 De-energize the equipment immediately. Take another sample and verify results. If verified, process or replacethe fluid before returning to service.E200< 800 Continue with Eaton recommended maintenance schedule (inspection and sampling every 2 years).800 – 1200 Obtain another fluid sample for moisture analysis in 6 months to determine if moisture levels are rising. Referto the Fluid sampling guidelines section in this manual. If moisture levels increase, determine leakpoint and repair. Process or replace the fluid if water conent has exceeded 1200 ppm.> 1200 De-energize the equipment immediately. Take another sample and verify results. If verified, process or replacethe fluid before returning to service.Table 4 Dissolved gas in insulating fluid maintenancechartAcetylene LevelC2H2Total CombustibleGas Required ActionLess than 35 ppm Less than 500 ppmNormal Level - Resampleper routine maintenanceschedule35-50 ppm 500-1000 ppm Caution Level - Resampleat 3-6 months to espablishtrend; maintain fluid ifgas levels increase tohazardous level.More than 50 ppm More than 1000ppmHazardous Level - Removeunit from service andmaintain the fluid.Replacement partsOnly factory-authorized replacement parts are to be usedfor Eaton’s Cooper Power series Distribution Switchgearproducts. Replacement parts are available through thefactory Service Department. To order replacement parts,refer to the nameplate and provide the product type, serialnumber, catalog number, voltage rating, and a descriptionof the part. Contact your Eaton representative for additionalinformation and ordering procedures. The followingdocuments are also available for common field repairs andprocedures:● MN285009EN – Cover gasket replacement, coverinstalation, leak check procedures and fluid samplingporcedures.● MN285007EN – Visible break window replacementprocedure.

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