因此，如果做出選擇，為了得到可靠的斷路器失靈動作，水平必須總是高于監(jiān)測啟動水平。這也可能發(fā)生在-一個半開關(guān)或環(huán)形母線結(jié)構(gòu)中,在那些情況下第-個斷路器合于,保護(hù)跳閘并且試圖起動第二個斷路器的失靈保護(hù),而第二個斷路器在合閘過程當(dāng)中,但還沒有電流流過它。

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