I-FAQ ye-insulation resistance tester

I-insulation resistance tester ilungele ukulinganisa ixabiso lokumelana lezinto ezahlukeneyo zokugquma kunye nokumelana nokugquma kwee-transformers, ii-motor, iintambo kunye nezixhobo zombane ukuqinisekisa ukuba ezi zixhobo, izixhobo zombane kunye nemigca zisebenza kwimeko eqhelekileyo kwaye ziphephe iingozi ezinjengokothuka kombane. iingozi kunye nomonakalo wezixhobo.

Iingxaki eziqhelekileyo zomvavanyi wokumelana nokugquma zezi zilandelayo:

1. Xa ulinganisa ukuxhathisa komthwalo we-capacitive, yintoni ubudlelwane phakathi kwemveliso ye-short-circuit current ye-insulation resistance tester kunye nedatha elinganisiweyo, kwaye kutheni?

Imveliso ye-short-circuit current ye-insulation resistance tester ingabonakalisa ukuchasana kwangaphakathi komthombo ophezulu we-voltage.

Izinto ezininzi zokuvavanya ukufakwa kwe-insulation yimithwalo ye-capacitive, njengeentambo ezinde, ii-motor ezine-windings ezininzi, i-transformers, njl. Ngoko ke, xa into elinganisiweyo inomthamo, ekuqaleni kwenkqubo yovavanyo, umthombo ophezulu wombane kwi-tester resistance tester kufuneka ihlawule. i-capacitor ngokumelana kwayo kwangaphakathi, kwaye ngokuthe ngcembe ihlawulise i-voltage ukuya kwisiphumo esilinganiswe ngexabiso le-voltage ephezulu ye-insulation resistance tester.Ukuba ixabiso le-capacitance yento elinganisiweyo likhulu, okanye ukuchasana kwangaphakathi komthombo wamandla aphezulu kukhulu, inkqubo yokutshaja iya kuthatha ixesha elide.

Ubude bayo bunokumiselwa ngumkhiqizo we-R kunye no-C umthwalo (ngemizuzwana), oko kukuthi t = R * C umthwalo.

Ngoko ke, ngexesha lovavanyo, umthwalo we-capacitive kufuneka uhlawulwe kwi-voltage yokuvavanya, kunye nesantya sokushaja i-DV / DT ilingana nomlinganiselo wokutshaja ngoku I kunye nomthwalo we-capacitance C. Leyo yi-DV / dt = I / C.

Ngoko ke, ukuchasana kwangaphakathi kuncinci, inkulu ukutshaja okwangoku, kwaye ngokukhawuleza kwaye kuzinzile umphumo wokuvavanya.

2. Yintoni umsebenzi we "g" ekupheleni kwesixhobo?Kwimeko yokuvavanya i-voltage ephezulu kunye nokuchasana okuphezulu, kutheni isixhobo sixhunyiwe kwi-terminal "g"?

Isiphelo "g" sesixhobo sisixhobo sokukhusela, esisetyenziselwa ukuphelisa impembelelo yomswakama kunye nokungcola kwindawo yokuvavanya kwiziphumo zokulinganisa.Ukuphela kwe "g" yesixhobo kukudlula umbane wokuvuza phezu kwendawo evavanyiweyo, ukwenzela ukuba umbane wokuvuza ungadluli kwisiphaluka sovavanyo lwesixhobo, ukuphelisa impazamo ebangelwa ukuvuza kwangoku.Xa uvavanya ixabiso eliphezulu lokuchasa, ukuphela kwe-G kufuneka kusetyenziswe.

Ngokuqhelekileyo, i-g-terminal inokuqwalaselwa xa iphezulu kune-10g.Nangona kunjalo, olu luhlu lokuchasa alukho ngokupheleleyo.Icocekile kwaye yomile, kwaye umthamo wento oza kulinganiswa uncinci, ngoko unokuzinza ngaphandle kokulinganisa i-500g ekupheleni kwe-g;Kwimekobume emanzi nemdaka, ukuxhathisa okusezantsi nako kufuna i-terminal.Ngokukodwa, ukuba kufunyenwe ukuba umphumo kunzima ukuzinza xa ulinganisa ukuchasana okuphezulu, i-g-terminal inokuqwalaselwa.Ukongezelela, kufuneka kuqatshelwe ukuba i-terminal yokukhusela i-G ayixhunyiwe kwi-shielding layer, kodwa ixhunyiwe kwi-insulator phakathi kwe-L kunye ne-E, okanye kwi-multi strand wire, kungekhona kwezinye iingcingo eziphantsi kovavanyo.

3. Kutheni kuyimfuneko ukulinganisa ukuchasana okucocekileyo kuphela, kodwa kunye nomlinganiselo we-absorption kunye ne-polarization index xa ulinganisa i-insulation?

I-PI yi-index ye-polarization, ebhekisela ekuthelekisweni kokuchasana kwe-insulation kwimizuzu eyi-10 kunye nomzuzu we-1 ngexesha lovavanyo lwe-insulation;

I-DAR yi-dielectric absorption ratio, ebhekiselele kuthelekiso phakathi kokumelana nokufakwa kwe-insulation ngomzuzu omnye kunye nokuba kwi-15s;

Kuvavanyo lwe-insulation, ixabiso le-insulation resistance value ngexesha elithile alikwazi ukubonisa ngokupheleleyo umgangatho wokusebenza kwe-insulation yento yokuvavanya.Oku kubangelwa ezi zizathu zimbini zilandelayo: kwelinye icala, ukuchasana kwe-insulation ye-insulation material efanayo kuncinci xa umthamo ukhulu, kwaye ukhulu xa umthamo umncinci.Kwelinye icala, kukho ukutsalwa kwentlawulo kunye neenkqubo zepolarization kwizinto ezigqumayo xa kusetyenziswa amandla ombane aphezulu.Ke ngoko, inkqubo yamandla ifuna ukuba umlinganiselo wokufunxa (i-r60 ukuya kwi-r15s) kunye nesalathiso se-polarization (r10min ukuya kwi-r1min) kufuneka ilinganiswe kuvavanyo lokufakelwa kwe-insulation ye-transformer engundoqo, intambo, i-motor kunye nezinye izihlandlo ezininzi, kunye nemeko yokugquma ingagwetyelwa. le data.

4. Kutheni iibhetri ezininzi ze-electronic insulation resistance tester zinokuvelisa amandla ombane aphezulu eDC?Oku kusekwe kumgaqo woguqulo lweDC.Emva kokusetyenzwa kwesekethe yokunyusa, amandla ombane obonelelo asezantsi anyuselwa kwimveliso ephezulu yombane weDC.Nangona i-voltage ephezulu eyenziweyo iphezulu, amandla aphumayo amancinci (amandla aphantsi kunye namancinci akhoyo).

Qaphela: nokuba amandla amancinci kakhulu, akukhuthazwa ukuba uchukumise i-probe yokuvavanya, kuya kuhlala kukho ukubetha.