If only phase current is used in breaker failure protection, miss trip may occur no matter the threshold of current is higher or lower than load current.
如果仅采用相电流判据，将无法避免失灵保护误动或者拒动。
If only phase current is used in breaker failure protection, miss trip may occur no matter the threshold of current is higher or lower than load current.
如果仅采用相电流判据，将无法避免失灵保护误动或者拒动。
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