| 引用本文: | 刘 健,王毅钊,张小庆,等.配电网单相接地故障处理保护化关键技术[J].电力系统保护与控制,2021,49(22):18-23.[点击复制] |
| LIU Jian,WANG Yizhao,ZHANG Xiaoqing,et al.Key technologies on single-phase earthed fault protection for a distribution network[J].Power System Protection and Control,2021,49(22):18-23[点击复制] |
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| 摘要: |
| 为了提高中性点非有效接地系统单相接地故障处理能力，论述了变电站内外单相接地保护化的实现方式。探讨了跳闸延时时间、重合闸后故障性质判断、零序电压变化暂态过程影响的克服、间歇性弧光接地的处理、相继故障处理等关键技术问题及其解决途径。阐述了构筑消弧线圈系统、站内单相接地保护和调度自动化系统自动推拉组成的单相接地故障处理三道防线的概念，提出了依靠现场系统测试来保障单相接地保护应用效果的方法。结合西安市三环以内56个变电站单相接地保护化改造案例及其成效，说明所建议方法的可行性和有效性。 |
| 关键词: 变电站 配电网 中性点非有效接地系统 消弧线圈 单相接地 继电保护 |
| DOI：DOI: 10.19783/j.cnki.pspc.202162 |
| 投稿时间：2021-04-08修订日期：2021-04-08 |
| 基金项目:国家自然科学基金项目资助“城市智能配电网保护与自愈控制关键技术”(U1766208) |
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| Key technologies on single-phase earthed fault protection for a distribution network |
| LIU Jian,WANG Yizhao,ZHANG Xiaoqing,ZHANG Zhihua,QUAN Li,CHEN Jieyu |
| (1. School of Electrical Engineering, Xi'an University of Technology, Xi’an 710048, China;
2. State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China) |
| Abstract: |
| To help single-phase earthed fault management for neutral non-effectively grounded systems, the protection approaches in substations and on outside feeders are described. Some technical issues and solutions are discussed, such as time delay for tripping, permanent fault identification after reclosing, influence of the zero-sequence voltage transient, and handling intermittent arc earthed faults and cascading faults. The concept of three defensive lines for dealing with a signal-phase grounded fault in substations is elaborated. It consists of arc suppression coils, earthed fault protection and automatic searching approach in SCADA. It is emphasized that the field systematic test is an essential measure for earthed fault protection. The engineering of earthed fault protection with fifty-six substations in Xi'an city is introduced as an example. This shows the feasibility and effectiveness of the proposed approaches.
This work is supported by the National Natural Science Foundation of China “Key Technologies of Urban Intelligent Distribution Network Protection and Self-healing Control” (No. U1766208). |
| Key words: substations distribution networks neutral non-effectively grounded systems arc suppression coils single-phase earthed fault relay protection |
