22F-A011N103

22F-A011N103

22F-A011N103

由于励磁涌流幅值很大且仅流经变压器电源侧，将引起变压器纵差动保护产生很大的差流，导致差动保护误动作跳闸。因此，在励磁涌流情况下采取有效措施闭锁差动保护，防止误动。

以常见的二次谐波制动为例，讲解一下保护装置是如何防止励磁涌流引起的误动的。二次谐波制动的方法：二次谐波制动是根据励磁涌流中含有大量二次谐波分量的特点，当检测到差电流中二次谐波含量大于整定值时就将差动继电器闭锁，以防止励磁涌流引起的误动。

22F-A011N103

ALLEN BRADLEY 1771-ES B 1771ES B SERVO EXPANDER MODULE

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