Lub hauv paus ntsiab lus ntawm kev ntsuas dc to tam sim no ntawm ib qho hluav taws xob insulator yog qhov pib zoo ib yam li kev ntsuas kev tiv thaiv hluav taws xob.
Qhov txawv yog: dc leak test voltage feem ntau siab dua megohmmeter voltage, thiab tuaj yeem hloov kho, megohmmeter, txwv tsis pub, nws yog siab dua qhov ua tau zoo ntawm qhov tsis xws luag pom los ntawm megger, rhiab rau kev cuam tshuam cov kab nrib pleb rwb thaiv tsev, sab hauv ntawm cov qhaub cij. rwb thaiv tsev yuav cuam tshuam nrog damp yuav cuam tshuam nrog ntub dej thiab hauv zos tawg, xoob insulating roj degradation, char raws li qhov chaw ntawm rwb thaiv tsev, thiab lwm yam.
Kev ntsuas hluav taws xob dc thiab kev ntsuas qhov ntsuas tam sim no txawm tias txoj kev zoo ib yam, tab sis nws lub luag haujlwm yog qhov sib txawv, qhov qub yog kuaj cov rwb thaiv tsev tiv thaiv lub zog, qhov ntsuas hluav taws xob ntau dua;Cov tom kawg yog siv los xyuas qhov kev tiv thaiv hluav taws xob, qhov ntsuas hluav taws xob kuj tseem qis.Yog li ntawd, dc voltage tsis kam yog qhov tseem ceeb tshwj xeeb los nrhiav qee qhov tsis xws luag hauv zos, thiab siv dav hauv kev tiv thaiv kev tiv thaiv ntawm high-voltage motors, cables thiab capacitors.Nws muaj cov yam ntxwv hauv qab no piv nrog ac siab ntsuas.
1. Cov khoom siv kuaj yog lub teeb thiab me me
Dc tiv taus cov khoom siv ntsuas hluav taws xob yog lub teeb thiab yooj yim rau kev tiv thaiv kev sim hauv thaj teb.Piv txwv li, rau cov kab hluav taws xob, yog tias AC tiv taus qhov ntsuas hluav taws xob, qhov ntsuas tam sim no ib kilometer yuav yog ob peb amperes, yuav tsum muaj cov khoom siv muaj peev xwm loj dua.Thaum qhov ntsuas hluav taws xob dc ua tiav, tsuas yog cov hluav taws xob hluav taws xob hluav taws xob (txog li milliampere) tau muab tom qab stabilization.
2. tuaj yeem ntsuas qhov dej ntws tawm tib lub sijhawm
Dc tiv taus qhov ntsuas hluav taws xob tuaj yeem cuam tshuam qhov tsis xws luag hauv kev rwb thaiv tsev zoo dua los ntawm kev ntsuas qhov hluav taws xob tam sim no thaum maj mam nce qhov hluav taws xob.Daim duab 3-1 qhia tau hais tias qee qhov cuam tshuam tam sim no nkhaus ntawm lub tshuab hluav taws xob rwb thaiv tsev thaum lub sij hawm dc voltage withstand test.Rau kev rwb thaiv tsev zoo, cov xau tam sim no nce linearly nrog voltage thiab tam sim no tus nqi yog me me, raws li qhia nyob rau hauv nkhaus 1. Yog hais tias lub rwb thaiv tsev yog damp, tam sim no tus nqi nce, raws li qhia nyob rau hauv nkhaus 2. Curve 3 qhia tias muaj concentration tsis xws luag nyob rau hauv rwb thaiv tsev.Thaum cov xau tam sim no dhau ib qho qauv, qhov laj thawj yuav tsum raug txheeb xyuas kom deb li deb tau kom tshem tawm.Yog tias cov dej xau tam sim no nyob ib ncig ntawm 0.5 zaug Ut tau nce sai, raws li qhia hauv nkhaus 4, ces lub tshuab hluav taws xob muaj kev pheej hmoo ntawm kev tawg thaum lub sijhawm ua haujlwm (tsis suav nrog overvoltage).
Thaum dc voltage withstand test yog nqa tawm ntawm lub hwj chim cables, kev nyeem ntawv ntawm to tam sim no feem ntau yog siv los nrhiav qhov tsis xws luag.Piv txwv li, thaum qhov sib txawv ntawm peb-theem to tam sim no loj dhau los yog cov pa xau tam sim no nce nrawm, qhov ntsuas hluav taws xob tuaj yeem nce ntxiv lossis lub sijhawm ntawm qhov hluav taws xob tiv thaiv tuaj yeem txuas ntxiv mus nrhiav qhov tsis xws luag raws li qhov xwm txheej tshwj xeeb.
3. Tsawg kev puas tsuaj rau rwb thaiv tsev
Dc high voltage muaj kev puas tsuaj me ntsis rau cov rwb thaiv tsev ntawm cov khoom kuaj.Thaum lub dc acting voltage siab heev uas ib nrab paug tshwm sim nyob rau hauv cov huab cua sib txawv, lub txee hluav taws xob teb induced los ntawm tus nqi generated los ntawm cov paug yuav tsis muaj zog teb lub zog nyob rau hauv cov huab cua sib txawv, yog li inhibiting ib feem ntawm cov pa paug.Yog tias nws yog qhov ntsuas hluav taws xob ac, vim qhov kev hloov pauv tsis tu ncua ntawm cov kev taw qhia ntawm qhov hluav taws xob, xws li huab cua sib txawv, txhua qhov ib nrab nthwv dej ntawm ib nrab tawm, qhov paug tawm no feem ntau txhawb cov decomposition ntawm cov organic insulating cov ntaub ntawv, kev laus deterioration, txo cov rwb thaiv tsev. kev ua tau zoo, kom lub zos tsis xws luag maj mam nthuav.Yog li, dc tiv thaiv qhov ntsuas hluav taws xob kuj tseem muaj qhov tsis zoo ntawm qhov kev sim ua rau qee yam.
Piv nrog rau kev ntsuas hluav taws xob ac, qhov tsis zoo ntawm DC tiv thaiv qhov ntsuas hluav taws xob yog: vim tias qhov sib txawv ntawm qhov hluav taws xob sib txawv hauv cov rwb thaiv tsev nyob rau hauv AC thiab DC, qhov kev ntsuam xyuas ntawm DC withstand voltage test tsis yog ze rau qhov tseeb raws li hauv qab AC.Yog li ntawd, rau xLPE cable, nws tsis tau tawm tswv yim los siv DC voltage test, DC voltage test discharge tsis yooj yim rau muab ntxuav, yooj yim ua rau kom them nqi, ua rau cov kev xeem puas.
Kev xaiv ntawm dc voltage withstand test voltage kuj yog ib qho teeb meem tseem ceeb, nws yog ib qho kev siv rau rwb thaiv tsev fais fab zaus AC withstand voltage thiab ac, DC breakdown zog piv, thiab feem ntau raws li kev khiav hauj lwm kev tsim.Piv txwv li, stator winding ntawm lub tshuab hluav taws xob yog 2-2.5 npaug ntawm qhov ntsuas hluav taws xob;Rau 3, 6, 10kV cables, siv 5 ~ 6 npaug ntawm qhov ntsuas hluav taws xob, rau 20, 35kV cables, siv 4 ~ 5 npaug ntawm qhov ntsuas hluav taws xob, thiab rau cov cables siab dua 35kV, siv 3 npaug ntawm qhov ntsuas hluav taws xob.Lub sij hawm ntawm dc voltage withstand test tuaj yeem ntev dua li ntawm AC voltage tiv thaiv kev ntsuas, yog li lub tshuab hluav taws xob sim yog txhawm rau nce qhov ntsuas hluav taws xob los ntawm 0.5 npaug ntawm txhua theem hauv theem, thiab nyob rau 1min hauv txhua theem los soj ntsuam thiab nyeem cov xau tus nqi tam sim no.Thaum lub sij hawm kuaj cable, qhov ntsuas hluav taws xob yuav tsum tau txuas ntxiv rau 5min los soj ntsuam thiab nyeem tus nqi xau tam sim no.
Post lub sij hawm: Jul-06-2022
