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煤矿电网的小电流接地系统发生单相接地故障时,会导致三相电压严重不对称,造成设备运行不稳定。由于故障后特征变化不明显,导致煤矿配电网的安全可靠性方面的研究不足。以中性点经消弧线圈接地方式的煤矿电网为研究对象,利用故障后的信号微弱变化的特点,提出利用小波分析法故障选线。从分析煤矿电网的故障状态开始,再应用小波分析法详述选线原理及实现过程,通过仿真及算例证明其可行性。
When the single-phase grounding fault occurs in the low-current grounding system of the coal mine power grid, the three-phase voltage will be seriously unsymmetrical, resulting in unstable operation of the equipment. Due to the obvious characteristic change after fault, the research on safety and reliability of coal distribution network is not enough. Taking the coal mine power network whose neutral point is connected with the arc suppression coil grounding mode as the research object, the fault line selection using wavelet analysis is proposed by using the characteristics of weak changes of the signal after the fault. Starting from the analysis of the fault status of the coal mine power grid, wavelet analysis is applied to detail the principle of line selection and its realization process. The feasibility and feasibility of the method are verified by simulation and examples.