中性点经消弧线圈并小电阻灵活接地系统高阻故障的识别方法  

High Impedance Fault Identification Method of Peterson Coil Paralleled with Low Resistance Flexible Grounded System

作　　者：谭王景 王倩[2] 孙磊[3] TAN Wang-jing;WANG Qian;SUN Lei(Shaanxi Polytechnic Institute,Xianyang 712000 China;Xi'an University of Technology,Xi'an 710048 China;State Grid Technology Institute,Jinan 250002 China)

机构地区：[1]陕西工业职业技术学院,陕西咸阳712000 [2]西安理工大学,陕西西安710048 [3]国家电网技术学院,山东济南250002

出　　处：《自动化技术与应用》2024年第12期154-158,共5页Techniques of Automation and Applications

基　　金：陕西省2023年重点研发计划(2023-YBGY-132);陕西工业职业技术学院科研项目(2023YKZD-002)。

摘　　要：针对中性点经消弧线圈并小电阻灵活接地系统发生高阻性接地故障时,零序保护无法正常动作的问题,提出一种基于零序电流、零序电压幅值相位差异的故障识别方法。首先,分析了发生高阻接地故障时,不同类型线路间零序电流的幅值特征差异。其次,根据灵活接地系统中性点小电阻投入前后,非故障线路、故障线路零序电流与母线零序电压的相角差异提出故障识别判据。最后,通过仿真验证了该方法的有效性。Aiming at the difficulty that the zero sequence protection fails to operat when the high resistance grounding fault occurs in the neutral point through the peterson coil parallel with a low resistance system.A fault identification strategy is proposed by using the amplitude and phase difference of zero sequence voltage and zero sequence current.First,the amplitude characteristics of zero sequence voltage of sound line and zero sequence current of faulty line in high impedance fault are analyzed.Then,According to the phase difference between the zero sequence voltage of the bus bar and the zero sequence current of the faulty line before and after the small resistance is put into operation,a fault identification criterion is proposed.Finally,the effectiveness of the method is verified by simulation.

关 键 词：消弧线圈并小电阻 高阻接地故障 故障识别 零序电流 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]