关键词: 光学电流传感器, 故障选线, 信号去噪, 谐波分析

Abstract:

A feasible method for detecting fault signals with optical current sensors in power networks is proposed with the single-phase grounding fault current in medium-voltage power grid as an example. The mixed programming with Labview and Matlab is adopted to simulate the grounding fault current, with wavelet denoising the measured fault signals. An analysis of harmonic component of denoising signals is made, which indicates that the selection of fault line based on fifth harmonic is done correctly. Simulation and design show that the denoising fault signals are real and reliable, and that the analysis of proportion of harmonic frequency is the real reflect of the fault signal component as well.

Key words: optical current transformer, selection of fault line, signals denoising, analysis of harmonic component