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《HighVoltageEquipmentTesting》LoopResistanceTest主讲人:何发武(副教授)
OperatingWorksheet:
OperatingWorksheet:
TableofContents01Followme02Workshop03Training
01Followme
FollowMeThedifferencebetweenloopresistanceandDCresistanceliesintheelectricalequipmentandtherangeoftestcurrentsused.Aloopresistancetestercanmeasurewithintherangeof100–600?A,whileaDCresistancetestertypicallymeasuresatthepositionof1/3/5/10/30?A.DCresistanceismainlyusedintransformertesting,whileloopresistanceisprimarilyappliedtodevicessuchascircuitbreakersanddisconnectswitches.
Ⅰ.PurposeofLoopResistanceTestingTheconductivecircuitofhigh-voltageswitchgeariscomposedofmultipleconductorsthatallowelectricalconductionthroughcontact.TheDCresistanceoftheconductivecircuitincludesnotonlytheDCresistanceoftheconductormaterialitselfbutalsothecontactresistanceofvariouselectricalcontacts.TheconductivecircuitofGasInsulatedSwitchgear(GIS)isevenmorecomplex.Theresistanceoftheconductoritselfdependsontheresistivityoftheconductormaterialanditsgeometricdimensions.
Ⅰ.PurposeofLoopResistanceTestingInthelong-termoperationofelectricalswitchequipment,thecontactresistanceisaffectedbychemicalcorrosion,mechanicalwear,electricalwear,shortcircuitcontactweldingandotherfactors.Ifthecontactresistanceistoolarge,theheatgeneratedunderthelong-termoperatingcurrentwillincreasewiththeincreaseinresistance,thetemperatureoftheelectricalcontactrisessharply,whichmayresultinadeclineintheinsulatingpropertiesoftheinsulatingmaterialandmechanicalstrength,Theoxidationofthecontactsurfaceleadstofurtherdeterioration.Inseverecases,itmaycausepartialweldingofthecontact,affectingthenormalopeningandclosingoftheswitch.Whenpassingtheshort-circuitcurrent,itwillalsoaffectthedynamic,thermalstabilityandinterrup
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