10kV混合式磁偏置高温超导限流器性能实验研究

Experimental study on the steady properties of a 10 kV hybrid self-triggering HT SFCL prototype with biased magnetic field

近年来,随着电力负荷的快速增长,故障电流水平迅速上升,传统的断路器容量已不能满足要求。利用高温超导的失超特性对电网进行实时保护,不仅可以降低断路器的容量,而且可以提高电网的安全性。介绍了一种新型的偏置磁场自触发超导故障限流器,该限流器主要包含一个双分裂对称绕组的电抗器和多个无感高温超导线圈模块。然后搭建了SFCL磁体的临界电流、交流损耗和工频过电流实验测试系统,对SFCL无感超导单元的临界电流、交流损耗和工频过电流特性进行了实验研究。工频限流测试结果表明:故障后第1周波限流比为43%,第二周波限流比为90%,验证了该SFCL的有效性和技术可行性。

The level of fault current has been increasing quickly with rapid growth of electric load in recent years.High temperature superconducting fault current limiters(SFCLs)use the quench properties of HTS to instantaneously protect power grids.This paper proposed a novel self-triggering superconducting fault current limiter with bias magnetic field.This high temperature superconducting fault current limiter had a reactor with double-split symmetrical windings and a high temperature superconducting(HTS)module which was non-inductive and it was in series to one branch of the reactor.The critical current,AC losses and over-current experimental test systems were set up for test a unit of SFCL magnet.The characteristics of the critical current,AC losses and the current limiting ratio for the non-inductive superconducting unit of SFCL were experimental investigated.It is found that the current limiting ratios are 43%in the first circuit and 90%in the second fault current circle,which verify the effectiveness of this SFCL and evaluate the technical feasibility.