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 12 page image

8Type VFI, Fluid-insulated SwitchgearINSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS MN285006EN March 2018To assure trouble-free operation of this equipment, aregular schedule of fluid testing and fluid maintenance isrequired. A routine fluid testing and maintenance scheduleis necessary to monitor changes that occur in the fluidas a result of normal operation and to detect abnormalconditions that may occur.Maintaining a record of this test data will help in assessingthe condition of the fluid over time.Frequency of maintenanceFluid insulated unitsThe insulating fluid should be initially tested within twoyears after the installation of the equipment. That test willyield information required to establish a baseline referencefor observing trends in the unit’s normal operation and todiagnose any fault conditions that may be present.After the initial fluid testing and inspection, vacuumswitchgear should be maintained every two years.Each scheduled maintenance of the switchgear shouldinclude a physical inspection of the unit, a fluid level check,and fluid testing as described in the Fluid testing section ofthis manual.Types of fluid samplesThe unit must be de-energized before withdrawing a fluidsample. Withdrawing a fluid sample from a unit that hascritically low fluid level could result in flashover and unitfailure when the unit is re-energized. Never energize thisequipment without ensuring that it is filled to the properfluid level with clean, dry insulating fluid.The fluid sampling procedure requires that two types offluid samples be taken:1 A bulk fluid sample for general fluid tests.Approximately one quart (one liter), taken in accordancewith ASTM D923 (latest revision), is required.2 A “gas-tight” fluid sample, taken in accordance withASTM D3613 (latest revision), for diagnosis and faultgas analysisFluid sampling guidelinesWARNINGHazardous 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 2Use the following fluid sampling guidelines to preventcontamination and to safely extract fluid samples:1. De-energize and ground the switchgear prior tosampling fluid.2. Where local governing authorities allow access toenergized equipment, the following precautions mustbe taken:DANGERHazardous voltage Contact with hazardous voltage willcause death or severe personal injury Follow all locallyapproved safety procedures when working around high-and low-voltage lines and equipment G103 3WARNINGHazardous voltage Always use a shotgun stick whenworking with this equipment Failure to do so couldresult in contact with high voltage, which will causedeath or severe personal injury G108 0a. A hotstick tool capable of uncapping, opening andcollecting fluid from the fluid sampling valve shouldbe used to keep personnel away from the energizedbushings.WARNINGThis equipment is not intended to protect humanlife Follow all locally approved procedures and safetypractices when installing or operating this equipmentFailure to comply can result in death, severe personalinjury, and equipment damage G102 1b. Personnel authorized to access energized equipmentmust be properly trained in locally approved safetyprocedures and utilize locally approved personalprotection equipment.WARNINGDo not operate this equippment if energized parts arenot immersed in dielectric fluid Operation when partsare not properly immersed in dielectric fluid may resultin internal flashovers that will damage the equipmentand can cause death or severe personal injury G104 4c. Check switchgear fluid level prior to extracting afluid sample. If the fluid level is low, do not attemptto extract a sample.d. A means to plug the fluid sampling valve should beavailable in the event the valve is unable to closeand fluid continues to flow.WARNINGThe switchgear tank must have neutral or positiveinternal pressure prior to extracting a fluid sampleNegative internal pressure may cause air to enter thetank during sampling which can reduce the fluid’sdielectric strength This may result in internal flashoversthat will damage the equipment and can cause death orsevere personal injurye. Neutralize internal tank pressure by pulling on thepressure relief device ring prior to opening thesampling valve.