案可能直接起動或是電流水平監(jiān)測。確定是否使用電流監(jiān)測是特別地重要。使用電流監(jiān)測起動斷路器失靈會導致在流過斷路器的電流很小或是沒有時失靈元件不起動，在變壓呂器時會發(fā)生這種情況。在另外那些需要在水平低于開關失員1相電監(jiān)視啟動或開關失靈

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