基于五次谐波变化特征的10kV配网单相接地故障自动识别  

Automatic Identification of Single-Phase Ground Faults in 10 kV Distribution Network Based on Fifth-Harmonic Variation Characteristics

作　　者：王桢干 WANG Zhengan(Binhai County Power Supply Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Yancheng,Jiangsu 224500,China)

机构地区：[1]国网江苏省电力有限公司滨海县供电分公司,江苏盐城224500

出　　处：《自动化应用》2024年第13期237-239,共3页Automation Application

摘　　要：为优化10 kV配网单相接地故障自动识别效果,降低故障识别误报率,提高自动识别准确性,开展了基于五次谐波变化特征的10 kV配网单相接地故障自动识别研究。首先,提取10 kV配网的五次谐波变化特征,实现故障线路选线操作;其次,确定配网区段零序电流有效值,自动定位故障区段。在此基础上,搭建10 kV配电网单相接地故障模型,自动识别单相接地故障,确定故障点。结果表明,应用提出的识别方法后,误报率明显较低,最高不超过0.05%,具有较高的识别准确性。In order to optimize the automatic identification effect of single-phase grounding faults in 10 kV distribution networks,reduce the false alarm rate of fault identification,and improve the accuracy of automatic identification,research on automatic identification of single-phase grounding faults in 10 kV distribution networks based on the characteristics of fifthharmonic variation has been carried out.Firstly,extract the fifth-harmonic variation characteristics of the 10 kV distribution network to achieve fault line selection operation.Secondly,determine the effective value of zero sequence current in the distribution network section and automatically locate the faulty section.On this basis,build a single-phase grounding fault model for a 10 kV distribution network,automatically identify single-phase grounding faults,and determine the fault point.The results show that the proposed recognition method has a significantly lower false alarm rate after application,with the highest not exceeding 0.05%,and has high recognition accuracy.

关 键 词：五次谐波变化特征 配网 单相接地 

分 类 号：U226.5[交通运输工程—道路与铁道工程]