By analysis and calculation for short circuit current of lowvoltage motor, kinds and protection methods of short circuit of the lowvoltage are explained.
通过对低压电动机短路电流分析和计算，说明低压电动机短路的种类和保护方法。
2
Based on the analysis of main fault types of LV (LowVoltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.
It is the only way to solve above problems that the earth leakage circuit breaker of time lag action and the distribution protection are adopted in lowvoltage supply system.