Simulation on Grounding Fault Location of Distribution Network Based on Regional Parameters

摘要

The distribution network fault will cause big range and long-time blackout which will affect the safe and stable operation of the power system. The difficulty of locating grounding faults in power distribution networks is arc-suppression-coil-ground neutral system. The introduction of the arc suppression coil and the increase of the compensation current in the system make the relationship among zero sequence currents more complex, moreover, the comparison of zero sequence currents to realize the grounding fault location of arc suppression coil becomes more difficult. Although the residual increment method, short-circuit fault indicator method, signal injection method and first-half wave method are proposed in our country, but their effect are not good for grounding fault with high transition resistance, and the success rate of the grounding fault location is not high. In order to improve the real-time and accuracy of online monitoring for grounding fault location in the distribution network, this paper proposes a grounding fault location method based on regional parameters. The method divides the distribution network into several regions, and each region is installed a zero-phase sequence current transformer at the boundary.