基于电流故障分量比相法的变压器后备保护

针对传统变压器高压侧后备保护在低压侧发生故障时灵敏度不足的问题．文中提出了一种基于电流故障分量比相法的变压器后备保护方案。方案以信息集成为基础，利用集成保护信息冗余的特点，通过比较各侧变压器和线路的电流故障分量相位，判断其故障位置。方案不但提高了后备保护的灵敏性，而且缩短了后备保护的动作时间。经simulink仿真，证明了方案的可行性。

Transformer Backup Protection Based on Current Fault Component Phase Comparison

In order to solve the problem that the transformer＂ s backup protection at high voltage side is not sensitive to the faults occurred at the low voltage side of transformer, a new scheme of transformer backup protection based on current fault component phase comparison is proposed. The scheme is based on information integration, and uses information redundancy characteristics of the integrated protection to judge fault location through comparing the transformer and line each side of the current fault component phase. The scheme not only shorten the backup protection action time, but also improves the sensitivity of the backup protection. The paper also proves the feasibility of this scheme by simulink.