Technology for leakage fault prevention and anti-override trip in coal mine intelligent power supply system and its development prospect

The research on leakage and anti-tripping technology of coal mine power supply system is carried out, involving two parts: high voltage power supply system and low voltage power supply system. The relevant research on high-voltage power supply system is carried out from three levels: model mechanism, method and system. The research on leakage and anti-override trip of high-voltage system in coal mine focuses on the analysis of intermittent arc fault mechanism characteristics, the research of related methods, and the research and design of system intelligence and device integration. The research on low-voltage power supply system is carried out from three levels: the necessity, model characteristics and method of leakage protection. The research on leakage and protection of low-voltage system in coal mine focuses on the insulation warning before leakage and the quickness and selectivity of protection after leakage. This paper puts forward the solution of preventing leakage fault and anti-override trip by digital intelligent, and gives the “five-dimensional unity” leakage prevention solution and key technology of insulation early warning, fault line selection, section location, fault location and digital twin, and looks forward to the development of intelligent power supply leakage and anti-lapse technology.