摘要
针对小电阻接地系统高阻故障时零序过电流保护灵敏度不足的问题,提出基于综合内积变换的高阻故障检测方法。分析了小电阻接地系统接地故障特征,并比较了各馈线零序电流与中性点零序电流。为了突显故障馈线与健全馈线之间的差异,提升小电阻接地系统高阻故障检测的可靠性,利用内积原理引入综合内积值为衡量指标以实现高阻故障检测。利用PSCAD建立了小电阻接地系统仿真模型并进行了故障仿真,结果表明所提出的方法能够检测高阻故障。
For insufficient sensitivity of zero sequence overcurrent protection in high impedance fault of small resistance grounding system,a high impedance fault detection method based on integrated inner product transform is proposed in this paper.The ground fault characteristics of the small resistance grounding system are analyzed and the zero sequence current of each feeder is compared with the zero sequence current of the neutral point.The inner product principle is used to distinguish the fault feeder from the healthy feeder.In order to expand the difference between the fault feeder and the healthy feeder and further improve the reliability of high impedance fault detection,the integrated inner product value is introduced as a measurement index to realize high impedance fault detection.A simulation model of small resistance grounding system is established by PSCAD and the fault simulation is carried out.The results show that the proposed method can detect high impedance fault.
作者
周鹏
刘伟博
王交通
陈文献
杜欢
李晨婧
王晓卫
ZHOU Peng;LIU Weibo;WANG Jiaotong;CHEN Wenxian;DU Huan;LI Chenjing;WANG Xiaowei(Ankang Electric Power Supply Company of State Grid Shaanxi Electric Power Company,Ankang 725000,Shaanxi,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710054,Shaanxi,China)
出处
《电网与清洁能源》
北大核心
2021年第9期70-76,共7页
Power System and Clean Energy
基金
陕西省重点研发计划资助项目(2018ZDXM-GY-169)。
关键词
小电阻接地系统
内积变换
高阻故障
零序电流
small resistance grounding system
inner product transformation
high impedance fault
zero sequence current