基于电流分布系数的母差保护非故障相饱和判别

当发生母线区外故障时,由于故障支路非故障相饱和所产生的突变电流可能导致母差保护误动。根据非故障相突变电流的产生机理及特点,本文提出一种通过电流分布系数识别故障支路非故障饱和的方法。本文对该方法进行了详细介绍,分析了该方法的适应性,并介绍了动模实验结果。该方法不需要引入故障相电流制动因子,所以在快速识别非故障相饱和的同时不会降低母差保护的灵敏性及速动性,发生转换性故障时母差保护依然可以快速动作。

Non-fault phase saturation discrimination for busbar differential protection based on current distribution coefficient

Busbar differential protection may operate wrongly because of the abrupt current of the non-fault phase of the fault feeder when external fault occurs. According to the generation mechanism and characteristics of the non-fault phase abrupt current, this paper proposes a method to identify the non-fault phase saturation by the current distribution coefficient. This paper introduces the method in detail, analyzes the adaptability of the method, and introduces the test results of RTDS. This method does not need to add the fault phase current braking factor, so it can quickly identify the non-fault phase saturation without reducing the sensitivity and rapidity of the busbar differential protection, busbar differential protection can still operate quickly when transferring fault occurs.