﻿ 输电线路发生单相接地短路后采样周期对测距精度的影响

# 输电线路发生单相接地短路后采样周期对测距精度的影响Influence of Sampling Period on the Accuracy of Single Phase to Ground Fault in Transmission Line

Abstract: We analyze the basic principle of power frequency fault location of single-phase to ground fault in three-phase system of transmission line and use PSCAD/EMTDC simulation software to build the transmission line distributed parameter model. According to the transmission line single-phase grounding short circuit fault simulation, we use the Fourier algorithm to extract cycles of failure and calculate the voltage and current of power frequency to fault location, which is based on power frequency component of single end fault distance measurement principle. And current power frequency is analyzed by using the Fourier algorithm. Based on the real time fault data collected by the recorder in the single phase to ground fault in the small sand 110 KV large Xiapu Fujian wind line, the influence of the sampling period on the ranging results is verified. It can be used for referencing in the selection of sampling period when using power frequency to carry out fault lo-cation.

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