MS1250D225NA
BN624A546HO1
PRDM2PP06KNN 16?
MS1250D225NA
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電話:15506917382??? 0591-62182535?
傳真:0591-22989937?? QQ:583745937? 聯(lián)系人:王工
福州卓凱電子科技有限公司
①當(dāng)電氣設(shè)備發(fā)生漏電時,出現(xiàn)兩種異?,F(xiàn)象:
一是,三相電流的平衡遭到破壞,出現(xiàn)零序電流;
二是,正常時不帶電的金屬外殼出現(xiàn)對地電壓(正常時,金屬外殼與大地均為零電位)。
?、诹阈螂娏骰ジ衅鞯淖饔寐╇姳Wo(hù)器通過電流互感器檢測取得異常訊號,經(jīng)過中間機(jī)構(gòu)轉(zhuǎn)換傳遞,使執(zhí)行機(jī)構(gòu)動作,通過開關(guān)裝置斷開電源。電流互感器的結(jié)構(gòu)與變壓器類似,是由兩個互相絕緣繞在同一鐵心上的線圈組成。當(dāng)一次線圈有剩余電流時,二次線圈就會感應(yīng)出電流。
?、勐╇姳Wo(hù)器工作原理將漏電保護(hù)器安裝在線路中,一次線圈與電網(wǎng)的線路相連接,二次線圈與漏電保護(hù)器中的脫扣器連接。當(dāng)用電設(shè)備正常運行時,線路中電流呈平衡狀態(tài),互感器中電流矢量之和為零(電流是有方向的矢量,如按流出的方向為“+”,返回方向為“-”,在互感器中往返的電流大小相等,方向相反,正負(fù)相互抵銷)。由于一次線圈中沒有剩余電流,所以不會感應(yīng)二次線圈,漏電保護(hù)器的開關(guān)裝置處于閉合狀態(tài)運行。當(dāng)設(shè)備外殼發(fā)生漏電并有人觸及時,則在故障點產(chǎn)生分流,此漏電電流經(jīng)人體?大地?工作接地,返回變壓器中性點(并未經(jīng)電流互感器),致使互感器申流入、流出的電流出現(xiàn)了不平衡(電流矢量之和不為零),一次線圈申產(chǎn)生剩余電流。因此,便會感應(yīng)二次線圈,當(dāng)這個電流值達(dá)到該漏電保護(hù)器限定的動作電流值時,自動開關(guān)脫扣,切斷電源。
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