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正常運行時(shí)，電力系統的三相電壓對稱(chēng)，第三線(xiàn)圈上的三相感應電動(dòng)勢之和為零。一旦發(fā)生單相接地時(shí)，中性點(diǎn)出現位移，開(kāi)口三角的端子間就會(huì )出現零序電壓使繼電器動(dòng)作，從而對電力系統起保護作用。

所屬分類(lèi)：

電壓互感器

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正常運行時(shí)，電力系統的三相電壓對稱(chēng)，第三線(xiàn)圈上的三相感應電動(dòng)勢之和為零。一旦發(fā)生單相接地時(shí)，中性點(diǎn)出現位移，開(kāi)口三角的端子間就會(huì )出現零序電壓使繼電器動(dòng)作，從而對電力系統起保護作用。

線(xiàn)圈出現零序電壓則相應的鐵心中就會(huì )出現零序磁通。為此，這種三相電壓互感器采用旁軛式鐵心（10KV及以下時(shí)）或采用三臺單相電壓互感器。對于這種互感器，第三線(xiàn)圈的準確度要求不高，但要求有一定的過(guò)勵磁特性（即當原邊電壓增加時(shí)，鐵心中的磁通密度也增加相應倍數而不會(huì )損壞）。

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