Nkhani

Mfundo yoyezera kutayikira kwa dc kwa insulator kwenikweni ndi yofanana ndi yoyezera kukana kwa insulation.
Kusiyana kwake ndikuti: dc leak test voltage nthawi zambiri imakhala yokwera kuposa voteji ya megohmmeter, ndipo imatha kusinthidwa, megohmmeter, apo ayi, ndiyokwera kuposa mphamvu yazovuta zomwe zimapezeka ndi megger, tcheru kuwonetsa kutchinjiriza kwa porcelain, mkati mwa sangweji. kutchinjiriza kumakhudzidwa ndi chinyezi kumakhudzidwa ndi kuphwanyidwa kwachinyezi ndi komweko, kuwonongeka kwamafuta otayirira, char pamwamba pa zotsekera, ndi zina zambiri.
Dc voteji kuyezetsa ndi kutayikira panopa muyeso ngakhale njira yomweyo, koma udindo wake ndi wosiyana, woyamba ndi kuyesa kukana mphamvu kutchinjiriza, voteji mayeso ndi apamwamba;Chotsatiracho chimagwiritsidwa ntchito poyang'ana momwe kutentha kumakhalira, magetsi oyesa ndi otsika.Chifukwa chake, kukana kwamagetsi a dc ndikofunikira kwambiri kuti mupeze zolakwika zina zakomweko, ndipo amagwiritsidwa ntchito kwambiri poyesa kuyesa kwamagetsi othamanga kwambiri, zingwe ndi ma capacitor.Ili ndi zotsatirazi poyerekeza ndi kuyesa kwa kuthamanga kwa ac.

1. Zida zoyesera ndizopepuka komanso zazing'ono

Zida zoyezera magetsi za Dc ndizopepuka komanso zosavuta kuyesa zodzitetezera m'munda.Mwachitsanzo, pa mizere ya chingwe, ngati ma ac akulimbana ndi mayeso a voteji, capacitance pano pa kilomita imodzi idzakhala ma ampere angapo, zomwe zimafuna zida zazikulu zoyezera mphamvu.Kuyesa kwa dc voltage kukachitika, kutulutsa kwaposachedwa kokha (mpaka mulingo wa milliampere) kumaperekedwa pambuyo pokhazikika.

2. Angathe kuyeza kutayikira panopa nthawi yomweyo

Dc standstand voltage test imatha kuwonetsa zolakwika pakuyika bwino pakuyeza kutayikira komwe kumatuluka ndikuwonjezera mphamvu yamagetsi.Chithunzi 3-1 chikuwonetsa zokhotakhota zapano za kutsekemera kwa jenereta panthawi yoyeserera ya dc voltage.Kwa kutchinjiriza kwabwino, kutayikira kwaposachedwa kumawonjezeka molingana ndi voteji ndipo mtengo wapano ndi wocheperako, monga momwe zikuwonetsedwera pamapindikira 1. Ngati kusungunula kuli konyowa, mtengo wapano ukuwonjezeka, monga momwe curve 2 ikuwonetsera. kutsekereza.Pamene kutuluka kwa madzi kumadutsa muyeso wina, chifukwa chake chiyenera kudziwika momwe mungathere kuti chithetse.Ngati kutayikira kwaposachedwa kozungulira 0,5 nthawi Ut kwakwera mwachangu, monga momwe ziwonetsedwera pamapindikira 4, ndiye kuti jenereta ili pachiwopsezo cha kusweka panthawi yogwira ntchito (kupatula kuchulukitsa).

Pamene dc voltage standstand test ikuchitika pazingwe zamagetsi, kuwerengera kwaposachedwa kwaposachedwa kumagwiritsidwa ntchito kupeza zolakwika.Mwachitsanzo, kusiyana kwa magawo atatu kutayikira kwapano kuli kwakukulu kwambiri kapena kutayikira komwe kukuchulukirachulukira, voteji yoyeserera imatha kuonjezedwa kapena kupirira kwamagetsi kumatha kuwonjezedwa kuti mupeze zolakwika malinga ndi momwe zilili.

3. Kuwonongeka kochepa kwa kutchinjiriza

Dc high voltage ilibe kuwonongeka pang'ono pakutchinjiriza kwa chinthu choyesedwa.Pamene dc akuchita voteji ndi mkulu kuti tsankho kumaliseche kumachitika mu mpweya kusiyana, kauntala magetsi munda anachititsa ndi mlandu kwaiye ndi kumaliseche adzafooketsa munda mphamvu mu kusiyana mpweya, motero kuletsa tsankho kumaliseche ndondomeko mu kusiyana mpweya.Ngati ndi mayeso ac voteji, chifukwa cha kusintha kosalekeza kwa mayendedwe a voteji, monga kutulutsa mpweya, kutulutsa kwapang'onopang'ono kwa theka lililonse, kutulutsa kumeneku nthawi zambiri kumalimbikitsa kuwonongeka kwa zida zoteteza organic, kuwonongeka kwa ukalamba, kuchepetsa kutsekemera. ntchito, kotero kuti zolakwika zapanyumba pang'onopang'ono zikule.Chifukwa chake, dc standstand voltage test ilinso ndi mtundu wa mayeso osawononga mpaka pamlingo wina.

Poyerekeza ndi test test voltage ya AC, kuipa kwa DC test test voltage ndi: chifukwa cha kugawa kwamagetsi kosiyanasiyana mkati mwa AC ndi DC, kuyesa kwa DC kupirira mayeso sikuli pafupi ndi zenizeni monga momwe zilili pansi pa AC.Chifukwa chake, pa chingwe cha xLPE, sichikulimbikitsidwa kugwiritsa ntchito mayeso amagetsi a DC, kutulutsa kwamagetsi kwa DC sikophweka kuyika koyera, kosavuta kutsogolera kusungitsa, kuwononga mayeso.
Kusankhidwa kwa dc voltage standstand test voltage kulinso vuto lofunikira, ndikutengera mphamvu yamagetsi pafupipafupi AC kupirira voteji ndi AC, chiŵerengero cha mphamvu ya kuwonongeka kwa DC, ndipo makamaka kutengera luso la ntchito kuti likhale.Mwachitsanzo, stator mapiringidzo a jenereta ndi 2-2.5 nthawi voteji oveteredwa;Pazingwe 3, 6, 10kV, tengani 5 ~ 6 kuwirikiza voteji, pazingwe 20, 35kV, tengani 4 ~ 5 kuwirikiza voteji, ndi zingwe pamwamba 35kV, kutenga 3 voteji oveteredwa.Nthawi ya dc voltage standstand test ingakhale yayitali kuposa ya AC voltage test test, kotero kuyesa kwa jenereta ndikuwonjezera mphamvu yamagetsi ndi 0.5 nthawi iliyonse pagawo lililonse, ndikukhala 1min pagawo lililonse kuti muwone ndikuwerenga kutayikira. mtengo wapano.Pakuyesa kwa chingwe, voliyumu yoyeserera iyenera kupitilizidwa kwa 5min kuti muwone ndikuwerenga kuchuluka kwaposachedwa.