The necessity of low resistance ground system and its fault characteristic were analyzed.
分析了采用小电阻接地系统的必要性及该系统的故障特性。
Analysis of measured signal of low resistance cable fault shows that: the method reduces deviation of singularity detection and improves precision of fault location.
测得的信号低电阻电缆故障的分析表明：这种方法可减少偏差的奇异性检测，提高了故障定位的精度。
They provide system security and immediate reliable low level ground fault detection on three-phase AC resistance grounded or grounded electrical distribution systems.
此类继电器能够增加系统安全性，并对三相交流接地电阻或接地配电系统进行可靠的低级接地故障检测。
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