刘红伟　郭上华（珠海许继电气有限公司，广东 珠海　519060）



基于直流注入法的新型小电流接地故障隔离和定位解决方案研究

刘红伟郭上华
（珠海许继电气有限公司，广东 珠海519060）

摘要10kV配电网小电流接地系统馈电线路单相接地故障隔离和定位解决方案，是近30年来国内外行业专家研究的重点，特别是消弧线圈接地系统单相接地故障隔离和定位解决方案一直是国内外研究的焦点。本文结合国内10kV配电网建设的特色要求，提出了一种基于直流注入法的新型小电流接地故障隔离和定位的解决方案，方案研究结果表明该方案能够自动隔离和定位故障点，能够可靠解决10kV全馈电线路小电流接地故障隔离和定位问题，能够提高配电网接地故障处理的可靠性、快速自愈性，也能够满足我国配电网建设的实用化要求。

关键词：直流注入法；配电变压器；接地故障；故障处理

Research on New Type of Small Current Grounding Fault Isolation and Location based on DC Injection Method

Liu HongweiGuo Shanghua
（Zhuhai XJ Electric Co.， Ltd， Zhuhai， Guangdong519060））

Abstract 10kV distribution network in small current ground systematically feed line single-phase grounding fault isolation and location solution is nearly 30 years the focus of domestic and international industry experts to study， especially the grounding system single-phase grounding fault isolation and location solution is always the focus of the research at home and abroad arc suppression coil extinction. Combined with the characteristics of domestic 10kV distribution network construction， put forward a based on DC injection method of a new type of small current grounding fault isolation and location of online solutions and scheme research results show that the scheme can automatic isolation and locate the fault point， can reliably solve 10kV complete feed line in small current grounding fault isolation and location problem， can improve the distribution network earthing fault processing reliability， fast healing，is also able to meet the practical requirements of the distribution network construction of our country.

Keywords：DC injection method; distribution transformer; ground fault; fault treatment

目前，国内10kV配电网小电流接地系统单相接地故障处理方法已取得了大量研究成果。研究成果主要有信号注入法和故障信号暂稳态法两大类[1]。信号注入法主要有交流注入法、中电阻增流法、直流注入法。故障信号暂稳态法主要有零序电流定值比较法、首半波法、功率方向法、谐波分量法、行波法、暂态特征频段法、参数识别法、相电流突变法。各种接地故障隔离和定位方法分析对比如下：

1）交流注入法[2]：交流注入法是指通过变电站接地系统中性点或通过接地变压器中性点向馈电线路注入特定频率的交流电流信号，利用故障指示器或故障探测器来定位接地故障点。……