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上三式中Udz--動(dòng)作電壓(V)；
Ny--電壓互感器變比；
Klm--靈敏系數(shù)，取1.25～1.5；
Uch--差電壓(V)；
K--因故障而切除的電容器臺(tái)數(shù)；
β--任意一臺(tái)電容器擊穿元件的百分?jǐn)?shù)；
M--每相各串聯(lián)段電容器并聯(lián)臺(tái)數(shù)。
由于三相電容的不平衡及電網(wǎng)電壓的不對(duì)稱，正常時(shí)存在不平衡零序電壓 Uobp，故應(yīng)進(jìn)行校驗(yàn)，即
Udx≥Kk Uobp (附5.5)
(二)雙星形接線中性線不平衡電壓或不平衡電流保護(hù)
1.不平衡電壓保護(hù)
 (附5.6)
 (附5.7)
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