采用消弧线圈并联中电阻的小电流接地系统故障选线方式

A Fault Line Selection Method for Small Current Neutral Grounded System by Arc Suppression Coil with Parallel Medium Resistance

介绍了中性点不接地系统和经消弧线圈接地系统中普遍采用的接地选线方式原理及优缺点,提出了经消弧线圈接地系统在单相接地故障时瞬时投入并联中电阻选线的新方法。通过计算分析和实际运行经验表明,采用该种选线方式能极大提高单相永久接地故障的选线准确性。

The theory, merits and shortoomings of the fault line selection methods commonly adopted in the neutral indirect grounding power system and arc suppression coil grounded system are introduced. A new method of switching on parallel medium resistance to select the fault line instantaneously when the single-phase earth fault occurs inthe are suppression coil grounded system is proposed. Computation analysis and practical operation experience prove that this method can significantly improve the accuracy of fault line selection for the single-phase earth fault.