谐振接地系统单相接地故障并联电阻选线的优化分析

The Optimization Analysis of Resonant Grounding System Single-Phase Grounding Fault Parallel Resistance Line Selection

中性点谐振接地能够减小单相接地故障时流经故障点的电流,从而使电弧瞬时熄灭,这不仅对电气设备和线路起到了一定的保护作用,而且还进一步提高了供电可靠性。然而,在单相接地故障电流受到限制后,故障线路与正常线路并没有差别,这给故障线路的选线带来了一定的困难。基于此点,文中首先对谐振系统单相接地故障的类型和现象进行分析,并在此基础上对并联电阻选线的优化进行研究。

Neutral resonant grounding can reduce single-phase grounding fault current flowing through the point of failure, so that the are is extinguished instantaneous. This is not only for a certain protection of the electrical equipment and line, but also further enhance the reliability of power supply. However, after the single phase grounding fault current is limited, there is no difference between the faulty line and normal line, that brings some difficuilties for the faulty line selec- tion. On the basis of this, the paper analyzed the fault type of the resonant system single-phase grounding and the phenome- non firstly, then based on this, researched on the optimization of parallel resistance line selection.