关于接地变加装小电阻不同方式的分析与风险管控

Analysis and Risk Control of Different Ways of Adding Small Resistance to Grounding

通过分析目前潮州10kV配电网几种接地方式的现状,从而得出中性点经消弧线圈并联小电阻的接地方式在电网发生故障时具有更大的优越性。当发生瞬时接地故障时,消弧线圈能够提供感性电流去补偿接地电流,达到减小残流的目的;在发生永久性故障的时候,通过小电阻的投入快速切除故障,极大提高配电网的供电安全性。本文介绍消弧线圈并联小电阻接地的工作原理,并分析小电阻和消弧线圈并联改造接地变的风险。

By analyzing the current status of several grounding methods in the Chaozhou 10 kV distribution network, it is concluded that the grounding method of the neutral point through the arc suppression coil parallel small resistance has greater advantages in the grid failure. When a transient ground fault occurs, the arc suppression coil can provide an inductive current to compensate the ground current to reduce the residual current; in the event of a permanent fault, the fault is quickly removed by the input of the small resistor, greatly improving the distribution network. Power supply security. The working principle of the arc suppression coil in parallel with the small resistance grounding is introduced, and the risk of the grounding of the small resistance and the arc suppression coil in parallel is analyzed.