故障限流器电流转移过程研究

Research on current transfer process of fault current limiter

对于电流转移型故障限流器,电流转移的原理和各部件之间的相互作用决定了限流器的性能。本文以一种基于高耦合分裂电抗器的交流故障限流器为研究对象,建立了能够反映HCSR复杂回路对电流转移过程影响的宽频模型,联合电弧模型仿真分析了HCSR引入后对限流器支路电流转移过程的影响。结果表明,开关进入真空电弧不稳定阶段后,限流器存在电流从开关支路向HCSR限流电感支路转移的现象,这一正反馈过程导致限流器开关更容易过零熄弧、实现电流转移。

For fault current limiter with current transfer process,the principle of current transfer and the interaction between the components determine the performance of the current limiter.In this paper,the AC fault current limiter based on high coupled split reactor is used as the research object,and a broadband model is established to reflect the influence of HCSR on the current transfer process,which is used to simulate and analyze the influence of HCSR on the current transfer results combined with arc model.The results show that when the switch steps into the vacuum arc instability stage,the current is transferred from the switch branch to the HCSR current limiter inductor branch.This positive feedback process leads to the easier current transfer and interruption of the switch.