马伟;黄晓波;吴旻昊;罗少杰;尤敏;丁冬;陈聪;王明昶;

• 1:国网浙江省电力有限公司杭州供电公司
• 2:国网福建省电力有限公司厦门供电公司

摘要(Abstract)：

针对在线路始端和末端将电流分配系数当作实数处理时存在较大误差的问题,提出一种基于高频谐波分量的距离保护阻抗测量改进方案。利用频率越高,电流分配系数越接近于实数的特点,首先,通过保护安装处的序电流与故障点电流的关系,推导出由保护安装处测量信息构成的故障距离百分比表达式。然后,通过提取故障波形中的高频谐波分量,求取保护安装处距离保护的真实故障阻抗。基于新英格兰10机39节点系统的仿真结果表明,不论过渡电阻大小和故障位置远近,方案的计算误差均优于与传统方案;同时,提取高频谐波所需采样窗长短,有助于提升距离保护的动作时间,具备良好的工程实用价值。

关键词(KeyWords)： 距离保护;阻抗测量;电流分配系数;过渡电阻;故障位置

Abstract:

Keywords:

基金项目(Foundation): 国家电网公司总部科技项目资助(521104170012,521101180004)~~

作者(Author): 马伟;黄晓波;吴旻昊;罗少杰;尤敏;丁冬;陈聪;王明昶;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.2853

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