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接地變壓器的作用是什么？

發布日期：2016-07-26 12:55 來源：//ultrarunning.cn 點擊：

  接地變壓器的作(zuo)用是在系統為△型接(jie)線(xian)或(huo)Y型接(jie)線(xian)中性點(dian)無法引(yin)出時，引(yin)出中性點(dian)用于加接(jie)消弧線圈，該(gai)變(bian)壓(ya)(ya)器(qi)(qi)采用Z型接線(xian)(或稱(cheng)曲折型接線(xian))，與(yu)普通(tong)(tong)變(bian)壓(ya)(ya)器(qi)(qi)的區(qu)別是每(mei)相線(xian)圈分別繞在兩個磁(ci)(ci)柱上，這樣連接的好處是零序磁(ci)(ci)通(tong)(tong)可沿(yan)磁(ci)(ci)柱流通(tong)(tong)，而(er)(er)普通(tong)(tong)變(bian)壓(ya)(ya)器(qi)(qi)的零序磁(ci)(ci)通(tong)(tong)是沿(yan)著漏磁(ci)(ci)磁(ci)(ci)路流通(tong)(tong)，所以(yi)Z型接地變(bian)壓(ya)(ya)器(qi)(qi)的零序阻抗(kang)很小(xiao)(10Ω左(zuo)右)，而(er)(er)普通(tong)(tong)變(bian)壓(ya)(ya)器(qi)(qi)要(yao)大得多(duo)。因此規程規定，用普通(tong)(tong)變(bian)壓(ya)(ya)器(qi)(qi)帶消(xiao)弧線圈時(shi)，其容(rong)量不得超(chao)過變(bian)壓(ya)器(qi)容(rong)量的20%，而Z型(xing)變(bian)壓(ya)器(qi)則可帶90% ～容(rong)量的消弧線圈，接地(di)變(bian)除(chu)可帶消弧圈外，也可帶二次負載(zai)，可代(dai)替所用(yong)變(bian)，從而節省投資費(fei)用(yong)。