我国金属矿山普遍存在的、主要的是直流电机车引起的杂散电流以及工频电源的漏电电流。直流杂散电流的来源有牵引网路流经金属物或大地的返回电流、大地自然电流及化学电。交流杂散电流,除少数矿山外一般都很小。杂散电流的存在,限制了电气起爆的广 China’s metal mines are ubiquitous, the main one is the stray current caused by DC locomotive and the leakage current of power frequency power supply. Sources of DC stray current are the return current, the earth’s natural current, and the chemical electricity that draw the network through the metal or earth. AC stray current, with the exception of a small number of mines are generally small. The existence of stray current, limiting the wide range of electrical detonation