《HighVoltageEquipmentTesting》HighVoltageNuclearPhaseTest主講人：何發武（副教授）OperatingWorksheet：TableofContents01Followme02Workshop03Training01FollowmeⅠ.OverviewofnuclearphaseForsubstations,powerlines,andotherinstallationswherenewlaying,rewiring,orcablejointsareperformed,itisnecessarytoconductanuclearphasebasedonthephasemarkingsinthepowersystemtoensureaconsistentphase.Ifthephasesdonotmatch,connectingtwopowersourcesthroughpowerlineswithmismatchedphasescanresultintheinabilityofthepowergridtooperateinaclosedloop.Thehigh-voltagewirelessdigitalnuclearphaseinstrumentisusedforphasecalibrationandphasesequencecalibrationofpowerlinesandsubstations.Ithasthefunctionsofphaseverification,phasesequencemeasurement,andelectricalinspection.Itcanverifythephasefrom200

Vto220

kVautomatically,suchas400

V,10

kV,35

kV,66

kV,110

kV,and220

kVdifferentgradesofvoltagetransmissionlinesliveworking.Ⅱ.TheprincipleofthenuclearphaseinstrumentTheprincipleofthenuclearphaseinstrumentistocollectvoltagesignalsfromthepowergridthathaveaphaserelationship,modulatethem,andcomparethephasedifferencestodeterminewhethertheyarein-phaseorout-of-phase.Thehigh-voltagenuclearphaseinstrumentmainlyconsistsofthreeparts:twosamplingtransmittersandareceivingdisplayhost.NuclearphaseinstrumentconsistingofdualtransmittersandasinglehostisshowninFigure3-92.HighvoltagewirelessnuclearphaseinstrumentwithdualtransmittersanddualmainframesisshowninFigure3-93.Ⅱ.Theprincipleofthenuclearphaseinstrument1–USBdatadownloadinterface；2–3.5-inchcolorLCDscreen；3–mainframe；4–up,down,left,andrightarrowkeysandMEMcontrolkeys；5–Mainframepowerbutton(on/off)；6–Detectorhooks(2pcs)；7–Detectorprobes(2pcs)；8–X-detector；9–Powerindicatorlight；10–DetectorPOWERkey(on/off)；11–Connectionportfordetectorinsulatingrod；12–Signalworkingindicatorlight；13–DetectorBatteryBottomCover；14–YDetector；15–Telescopicinsulatingrod(2

pcs).Figure3-92

NuclearphaseinstrumentconsistingofdualtransmittersandasinglehostⅡ.TheprincipleofthenuclearphaseinstrumentFigure3-93

HighVoltageWirelessnuclearphaseinstrumentwith

DualTransmittersandDualMainframesⅡ.TheprincipleofthenuclearphaseinstrumentDuringthetest,theXemitterandtheYemitteraredisconnectedfromeachotherelectricallyandareconnectedtothetwophasesforvoltagephasesampling,andthevoltagephasesignalistransmittedwirelessly.First,itisjudgedwhetherthelineischarged,andthenthesignalabouttheconductorissent.Thedisplayreceiversendsthedigitalsignaltothereceivingendthroughthewirelesstransmissionmodule,receivesthewirelesssignalofthetwosamplingtransmissionmodulesatthesametime,calculatesthevoltagephasedifferenceonbothsides,emitsthevoicesignal,anddisplaysthephaseresult.Ⅱ.TheprincipleofthenuclearphaseinstrumentAfterthetransmittingdeviceworksnormally,thecollectedgridvoltagesignalwithphaserelationshipisprocessedandmodulated,andthentransmittedtothereceivingdevice.Thereceivingdevicedemodulatesthereceivedgridvoltagesignalwithphasecharacteristicsandcomparesitwiththegridvoltagesignalwithphaserelationshipcollectedbythereceivingdeviceitselfinreal-time,andthephasedifferencevaluecanbemeasured.Thetransmittersendsthephaseandfrequencysignalsoftheirrespectivelinesbacktothereceivinghost.Thereceivinghostcalculatesthephasedifferencebetweenthethreelines,whichhasvoicepromptfunctionssuchas“Xsignalisnormal,Ysignalisnormal,in-phase,andout-of-phase”.Thehigh-voltagephasedetectorconsidersthatthephasedifferencevalueislessthan0–30asthesamephase,andthephasedifferencevalueisgreaterthan30asthedifferentphase.Ⅱ.TheprincipleofthenuclearphaseinstrumentThenuclearphaseisbasedontheXdetector,andtheAphaseisfixedlydisplayed.Ifthephaseangledifferencebetweenthetwodetectorsisintherangeof-30–30(330–360is-30–0),thedetectionresultoftheYdetectoristheAphase,whichisthesamephasequalitatively;ifthephaseangledifferencebetweenthetwodetectorsisintherangeof90–150or210–270,itisdifferentphase.Atthesametime,thehostvoiceprompts“samephase”or“differentphase”.Whenthephaseangledifferenceis90–150,thedetectionresultoftheYdetectorisBphase,thatis,sequentialphasesequence.Thephaseangledifferenceis210–270,andthedetectionresultoftheYdetectorisCphase,namelyinversephasesequence.02WorkshopⅠ.ConnectionWiringWhenthephaseischeckedonthespot,thenuclearphaseinstrumentisdetectedonthesamepowergridfirst.Onepersonoperatesandonepersonmonitors.Duringtheoperation,thetwotransmittersarehungonthesameconductorofthepowergridfirst.Whenthetwotransmittersareworkingnormally,thegreenlightison.Undernormalworkingconditions,thereceiverwilldisplaythephaseangleandfrequencyofthetwolinevoltages,anddisplaythelinevoltagewaveform,andthenuclearphaseinstrumentisnormal.Ⅰ.ConnectionWiringWhenoperatingthenuclearphaseinstrumenton-site,onepersonoperatesandanotherpersonmonitors.Operates,andrecordsaccordingtotheoperationstepsgradually.Thetwotransmitterdevicesarehungonthetwoconductorsofthemeasuredpowergridfirst,andthedisplayscreenshowsthephasedifferenceandlinefrequencyofthetwolines.Accordingtotheaboveoperation,thephaseofthetwopowergridsisdeterminedphasebyphase.Ⅰ.ConnectionWiringThenuclearphasecanbedonethroughcontactornon-contactmethods.Contactnuclearphasecanbedirectlyconductedonbareconductorsbelow35

kVandconductorswithsafetyinsulationskinbelow110

kV.Non-contactphasecomparisonisusedforbareconductorsabove35

kVandlinesabove110

kV.Regardlessofthemethod,insulatingrodsmustbeusedduringoperation.Thebarewiredetectorbelow35

kVcancontactthenuclearphasedirectly,andthebarewireabove35

kVadoptsthenon-contactnuclearphase.Thenon-contactnuclearphaseistograduallyapproachthedetectortothemeasuredwire.Whentheelectricfieldsignalisinduced,thenuclearphasecanbecompleted,sothatthereisnoneedtocontactthehigh-voltagewiredirectly,whichissafer.Ⅱ.TestingMethodConnecttheinsulatingrod,andpoweronthedevice.Ifthecommunicationbetweenthehostandthedetectorisnormal,thecorrespondingindicatorlightwillilluminate,andthehostwillprompt“Xsignalnormal”and“Ysignalnormal”.Ifthecommunicationisnotnormal,theindicatorlightwillnotilluminate.Ⅱ.TestingMethodForthenuclearphase,first,bringtheXdetectorclosetoorcontactwithanyphaseline,andthenbringtheYdetectorclosetoorcontactwiththeotherphaselinestobecompared.Duringthehigh-voltagenuclearphase,thedetectordoesnotneedtodirectlycontactthehigh-voltageconductor.Graduallybringthedetectionhookofthedetectorclosetotheconductor,andwhenanelectricfieldisdetected,thedetectorwillemita“du-du-du”soundandtheindicatorlightwillcontinuouslyflash,indicatingthatthepowertestingfunctioniscompleted,asshowninFigure3-94.Forlow-voltagenuclearphase(400

Vandbelow),especiallyforlow-voltagedistributionboxes,replacethemetaldetectionhookwithametalprobe.Ⅱ.TestingMethodFigure

3-94

NuclearphasetestoperationⅡ.TestingMethodDuringthenon-contactnuclearphase,ifthephaselinesarerelati