Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.

通过分析低压隔爆电动机的主要故障类型，针对不对称性短路故障和断相故障提出了采用负序保护原理进行保护的方案。

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On the principle of path-algebra and introducing in lengthening matrix, passing array, open-closed flag and non-circuit minimal path matrix, etc.

应用路径代数原理，通过引入途经数组等，给出一种TSP的新解法。

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