一种基于电流强制转移原理的直流混合式断路器

A DC Hybrid Circuit Breaker Based on Forced Current Commutation

在短路故障下,为了实现液态金属限流器高速开关触头无弧打开,提出了一种基于高速开关和液态金属限流器实现直流分断的混合式断路器拓扑结构。介绍了拓扑结构的设计原理及特点;分析了电流转移过程的操作原理;基于振荡电流源模拟故障电流对液态金属限流器的电流转移过程进行了试验研究,分析了不同因素对于液态金属限流器弧后恢复时间的影响,并确定了合适的转移起始电压。

A new topology of DC hybrid circuit breaker based on fast-switch（FS） and liquid metal fault current limiter（LMFCL） was proposed. The contacts of LMFCL FS can be opened without current in the case of short circuit fault. The design principle of the topology and the main remarkable features were introduced at first. Then, the operation principles of the current commutation processes were analyzed. Finally,with the fault current generated by the oscillating current source ,the influences of the channel diameter of LMFCL,current rising ratio and original voltage of commutation on the post arc resume time were investigated experimentally. And a suitable commutation original voltage was determined under different eonditions.