杨帆;刘鑫星;沈煜;薛永端;周志强;徐丙垠;

• 1:国网湖北省电力有限公司电力科学研究院
• 2:中国石油大学(华东)新能源学院山东省
• 3:山东科汇电力自动化股份有限公司

摘要(Abstract)：

小电阻接地系统可以有效抑制过电压,快速切除故障。随着电缆网规模的日益扩大,越来越多的大中城市开始使用该种接地方式。但现阶段采用的零序过电流保护启动门槛值较高,高阻接地故障时将拒动。分析了接地故障时中性点零序电流与各出线零序电流的关系,发现故障出线零序电流略大于中性点零序电流且二者近似反向,而健全出线零序电流远小于中性点零序电流且相位差约为90°,提出一种利用出线零序电流在中性点零序电流上投影系数大小的小电阻接地系统接地故障保护方法,可显著提高高阻接地时的保护灵敏度。仿真结果验证了方法的正确性及有效性。

关键词(KeyWords)： 小电阻接地系统;单相接地故障;高阻接地;投影;接地故障保护

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51477184);; 国网湖北省电力有限公司科技项目(521532170037)~~

作者(Author): 杨帆;刘鑫星;沈煜;薛永端;周志强;徐丙垠;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.2644

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