Research on Secondary Arc Characteristics of EHV Transmission Lines With Fault Current Limiter Based on High Coupled Split Reactor

摘要

To resolve the trouble of immoderate fault current with the improvement of the extra-high voltage (EHV) power system, additionally the voltage sags and power loss brought on by the traditional current-limiting ways, a innovative fault current limiter (FCL), which applies high coupled split reactor (HCSR) to current-limiting technology, has drawn severe interest due to its high reliability and superior current-limiting ability. In this paper, the secondary arc current characteristics of EHV lines with the FCL based on HCSR are investigated. Based on the simplified network and Laplace transform method, the variation of secondary arc current oscillation frequency and attenuation coefficient at different fault positions with and without the FCL based on HCSR is analyzed, and the transient characteristics are simulated and verified on the PSCAD platform. From the results, the application of the FCL based on HCSR will produce a high-frequency component of about 900 Hz during the fast decay period of the free component of the secondary arc current, which will cause its maximum value to larger. However, it will accelerate the decay rate of the secondary arc current and make it extinguish the arc faster.