一起10kV配电网电压异常事件的简要分析

对一起电压异常事故处理情况进行介绍,事故发生时虽然单相接地信号发出,但系统电压显示与单相接地时电压分布差异较大,造成故障分析判断困难。通过综合分析电压互感器开口三角电压输出和消弧线圈动作情况,判定系统发生了单相接地故障,并且电压二次接线存在错误。结合变电站一、二次接线情况,对系统运行工况进行详细深入的理论分析,并通过仿真验证理论分析的正确性。通过比对研究,理论分析、系统仿真和实际系统工况三者相互吻合,论证了对事故判断的正确性,并对二次接线存在的问题提出整改建议。通过对该事故处理和分析的介绍,给从事相关专业人员对类似事件分析和处理提供一定的启示和参考。

Analysis of Abnormal Voltage in 10 KV Distribution Network

An abnormal voltage accident treatment is presumed in this paper. While single-phase ground signal occured,the system voltage display quite differs from the typecal phenomenon,bringing the the difficulties of fault analysis and processing. Through comprehensive anlysis of potential tranformer open delta voltage output and the extinction coil action,it comes out the conclusion that the system has the single-phase grounding fault,and there is connection error in the potential transformer secondary parts. Combined with the primary and secondary wiring of transformer substation,a detailed theoretical anslysis of the system operating conditions is carried out,which is verified correct by simulation. Through comparative study,theoretical analysis,system simulation and actual system condition,the correctness of fault diagnosis is proved,and the suggestion on the secondary wiring problems is brought forward. Some inspiration and reference to similar event could be provided to the people who are engaged in relevant professionals.