基于零序电荷-零序电压关系的谐振接地系统单相接地故障特征分析  

Characteristics analysis of single-phase ground fault in resonant grounding system based on zero-sequence charge-voltage relationship

作　　者：王玘[1] 何正友[1] 张姝[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电力系统保护与控制》2013年第11期18-24,共7页Power System Protection and Control

摘　　要：首先从理论上分析了中性点经消弧线圈接地的小电流接地系统(谐振接地系统)发生单相接地故障时,故障暂态持续时间内健康馈线和故障馈线的零序电荷与零序电压的关系特征。其次通过仿真分析了不同接地电阻、不同故障距离、混合线路和噪声干扰等各种工况对零序电荷-零序电压关系特征的影响。仿真结果表明,健康馈线零序电荷-零序电压呈直线关系,故障馈线则不满足直线关系。利用零序电荷-电压关系特征可以快速明显地区分健康馈线和故障馈线,为选线提供有效依据。When a single-phase ground fault takes place in small current grounding system with neutral point grounding through the arc suppression coil, namely a resonant grounding system, the charge-voltage relationship of sound feeder and faulty feeder in fault transient time is analyzed. This characteristics＇ performance under various working conditions such as different grounding resistance, different fault distance, mixed lines and noise is analyzed by simulation. The results show that the zero-sequence charge is linear with the zero-sequence voltage in sound feeders while there is no linear relationship in fault feeders. In addition, these characteristics of the charge-voltage relationship can be used to distinguish sound feeder from faulty feeder rapidly and evidently. It provides an effective basis for the line selection.

关 键 词：谐振接地系统 单相接地 故障暂态 零序电荷-零序电压关系 

分 类 号：TM862[电气工程—高电压与绝缘技术]