直流接地极线路高阻接地故障识别方法

摘要

Voltage on DC system ground electrode Line is low, when high resistance grounding fault, especially the fault point in very near the ground site, the traditional ways of protection action sensitivity is low, resulting in the rejection rate greater protection. Because of the high resistance grounding, differential flow rate of change and the energy mutation rate obviously, therefore this arti-cle proposed one kind based on the differential current change rate and energy mutation identification method of high resistance grounding fault line is connected with the rate of the ends of the earth, and is verified by PSCAD.%由于直流系统接地极线路电压较低, 当发生高阻接地故障, 尤其故障点在极址附近时, 传统保护方式动作灵敏性较低, 导致保护拒动率较大. 因高阻接地时, 差流变化率和能量突变率明显, 故本文提出一种基于差流变化率和能量突变率的接地极线路高阻接地故障识别方法, 并通过PSCAD进行验证.