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针对煤矿井下低压电网漏电保护装置存在的问题,分析了发生漏电时电流序分量的组成特点,得出了上级漏电保护装置影响下下级漏电保护装置动作可靠性的结论,提出在分支馈电开关处采用零序有功电流作为特征参数的方法,并给出了直接采样零序有功电流的数据采集系统。该方案设计简单容易实现,可有效提高矿井电网检漏装置动作的可靠性。
Aiming at the existing problems of the earth leakage protection device in low voltage network of coal mine, the compositional characteristics of current sequence component in case of earth leakage are analyzed, and the conclusion is drawn that the leakage protection device of upper level is affected by the reliability of the earth leakage protection device. Zero-sequence active current is taken as the characteristic parameter, and the data acquisition system of direct sampling zero-sequence active current is given. The design of the scheme is simple and easy to implement, which can effectively improve the reliability of mine grid leakage detection device.