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1.HVDC_Operation_&_Maintenance

1.HVDC_Operation_&_Maintenance

ID：41099871

大小：1.80 MB

页数：19页

时间：2019-08-16

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1、MAINTENANCEOFHVDCEQUIPMENTValveHallValveHallThestatusoftheThyristorlevelsinthevalvehallisavailableonlineintheVBEprinter.VBEmonitorscontinuously,thehealthinessofthethyristorsandassociatedvalvehallcomponentswhileinserviceFailureofthyristorisreportedintheVBEprinterandalsointhework

2、stationfortheoperatorAlarmisgeneratedupto3thyristorfailuresinavalveandon4thfailure,tripisgeneratedValveHall–ThyristorleveltestingFailuremaybeinThyristorSnubbercapacitorSnubberresistorTEcardTotestthethyristorlevel–ThyristorLevelTestUnitisusedwhichteststhyristorandassociatedc

3、omponentsTypeoffailureinthethyristorcanbedetected–Opencircuit,shortcircuit,gateopencircuitFOcablesfromVBEtotheTEcardaretestedusingtheFOAttenuationtestkitInspectionofGradingelectrodes–Yearly/2yearlyThyristorleveltestunitInspectionofgradingelectrodesConverterTransformerFollowing

4、testsaredoneduringyearlyshutdownCapacitanceandtanδofthebushingsUsedtodeterminethehealthinessofthebushinginsulationCheckingtheoperationofthebuchholzrelaysandPressureReliefDevices(PRD)CheckingoftheWTI&OTIalarmsandtripsCheckingwhetherallthealarmsarereportedtoHMIsystemCheckingth

5、eoperationoffirefightingdelugevalvesystemConverterTransformerReplacementoftheoilfiltersofOLTC(On-LoadtapChanger)–canbereplacedonlinewhenthealarmisgeneratedPeriodictestingoftheoil–DGA–todeterminetheincipientinternalfaultsofthetransformerTestingofalltheassociatedprotectionrelaysC

6、onverterTransformerConverterTransformerOLTC–InspectionoftheOLTCMaintenanceofOLTCafterevery1lakhoperationsWearandtearofallmechanical&electricalpartsoftheOLTCtobeinspected.Replacementofmechanicalpartswithhighwear&Tear.CleaningofFixedandmovingcontacts.CleaningofOLTCchambersFil

7、lingwithfreshoilOverhaulingofOLTCOverhaulingofOLTCACFilterMaintenanceoffilterbayequipmentincludesAssociatedbreakertesting-Operationtimings,alarm,lockoutchecksetc.TestingofCT–C&TanδCapacitancestackmeasurementandbalancingifrequiredInspectionofcapacitorstackforoilleakageMeasure

8、mentofresistorsandreactors–fordev

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