文中给出实用计算法，以便根据冲击回路参数估算操作波的波头、波尾和电压效率。

A practical calculation method is given. With the parameters of the impulse circuit the wave front and tail and the voltage efficiency can be calculated.

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合理地变更PT零序电压回路接线和正确的操作，对再发生此类事故可减小事故损失。

Reasonable modification to zero-sequence voltage circuit and proper operation can minimize losses caused by faults of this kind, if it happens again.

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