初双折射或被冻结的双折射，可用一个等效或有效应力状态来代替。

The initial or frozen-in double refraction is replaced by an equivalent or virtual state of stress.

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结果表明，用火花电阻等效亚纳秒脉冲放电管击穿后的状态是合适的。

It is shown that after the HVSPDT breakdown its status can be equivalent to the spark resistance.

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因此，本文对基于等效电流量测变换的电力系统状态估计算法进行了研究分析。

Therefore, state estimation algorithm based on the measurement transformation of the equivalent current is studied in this paper.

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