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Permissive Blocking

1、允许闭锁式

（A）闭锁式( blocking)；（B）允许式(permissive)；（C）直接跳闸式(direct trip)；（D）允许闭锁式(permissive blocking)。 5、下列因素（D）与输电线路纵联差动保护正确工作与否无关。

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