This paper analyzes the phase selection theories of sequence current, the current break variable and the compensation voltage.
分析了反映序电流、电流突变量和补偿电压的选相原理，提出了当电压互感器断线时为防止误动应闭锁补偿电压选相。
In order to protect transformers of the large generator-transformer unit in power systems, the paper puts forward a kind of new principle of transformer protection based on break-variable of current.
本文针对当前电力系统中大型发变组保护中的变压器保护提出了一种基于电流突变量的保护新方案。
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