基于信息融合的矿井低压电网漏电保护算法研究

Algorithmic Research on Leakage Protection of Coal Mine Low-voltage Grid Based on Information Fusion

为有效提高矿井低压电网漏电保护的准确性和鲁棒性,提出了一种基于信息融合的煤矿井下低压漏电保护方法,即采用相电流分时比值法、暂态电流小波分析法进行漏电故障选线。通过采样计算,获得线路稳态相电流比值和暂态相电流互积求和比值,可准确可靠地辨识出各线路零序电流的大小关系,判断出漏电支路。Matlab仿真实验结果表明,该保护方法可将暂稳态电流进行信息融合,综合选线、发出报警信号或同时执行跳闸,实现了漏电保护,其判断结果准确可靠。

A method based on information fusion on leakage protection of coal mine low-voltage grid was presented in this paper, the phase current time-sharing ratio method, wavelet analysis method of the transient current for leakage fault line selection. Lines were obtained through the sampling calculation of steady state and transient current product each phase current ratio sum ratio, can be accurate and reliable to identify the relationship between the size of the two zero sequence currents, judge the leakage branch. Matlab simulation experiment results show that the temporary stabilization for information fusion, the current integrated line selection, send out alarm signal or perform trip at the same time, realize the electric leakage protection, judgment results are accurate and reliable.