南方小型矿井由于地质变化大,采区服务限短,设备安装容量小,因而采区供电往往就形成了变电所远离采掘工作面的状况。由于低压网路过长,使线路压降大,影响起动力矩;最远点两相短路电流小,达不到《矿井低压电网短路保护装置的整定细则》的要求。(以下简称《细则》)有时不得已而采用大量大截面橡套电缆,致造成极大的浪费。为使采区供电达到安全和经济的目的,如实行升压运行,设备改造工作量将很大,运行中对系统绝缘水平要求较高,因而只能逐步报 Due to the large geological changes in the small coal mines in South China, the service area of ​​the mining area is short and the installation capacity of the equipment is small. Therefore, the power supply in the mining area tends to be away from the mining face. As the low-voltage network is too long, so that the line pressure drop, affecting the starting torque; furthest point two-phase short-circuit current, less than “mine low-voltage power network short-circuit protection device tuning rules” requirements. (Hereinafter referred to as the “Rules”) sometimes resorted to using a large number of large cross-section rubber cables, resulting in a great waste. In order to make the mining area power supply achieve the purpose of safety and economy, such as the implementation of step-up operation, the workload of equipment reform will be great, the operation of the system requires a higher level of insulation, which can only be gradually reported