| 引用本文: | 齐郑,刁春燕,陈艳波.配电网快速故障点转移熄弧方法的有效性在线辨识研究[J].电力系统保护与控制,2020,48(11):69-75.[点击复制] |
| QI Zheng,DIAO Chunyan,CHEN Yanbo.Online identification of the effectiveness of fast fault point transfer arc extinguishing method for distribution networks[J].Power System Protection and Control,2020,48(11):69-75[点击复制] |
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| 摘要: |
| 针对中性点不接地系统快速故障点转移熄弧方法在故障相母线接地期间无法判断原故障点故障状态的问题，分析了线路重载和轻载两种情况下站内可测电气量的特征差异。当线路重载时，若原故障点故障未消除，两同相接地点间的大地支路将对负荷电流产生分流，推导叠加负荷分量的母线接地点电流表达式。利用幅值和相位偏移度是否超过所设门槛值判断原故障点状态。当线路轻载时，若原故障点故障未消除，两同相接地点使中性点不接地系统零序通路改变。利用对称分量法分别计算一点接地和两点接地时的故障线路零序电流，利用零序电流偏移度判断原故障点状态。设计了故障相母线接地期间原故障点状态辨识及动作流程，并通过ATP仿真软件对提出的方法进行了仿真验证。 |
| 关键词: 中性点不接地系统 单相接地 快速故障点转移熄弧方法 故障状态辨识 |
| DOI：10.19783/j.cnki.pspc.190845 |
| 投稿时间：2019-07-19修订日期：2019-12-29 |
| 基金项目:国家自然科学基金项目资助(51777067) |
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| Online identification of the effectiveness of fast fault point transfer arc extinguishing method for distribution networks |
| QI Zheng,DIAO Chunyan,CHEN Yanbo |
| (School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China) |
| Abstract: |
| This paper addresses the problem in neutral ungrounded system that the fast fault point transfer arc extinguishing method cannot identify the original fault state during the grounding of the fault phase bus. The characteristic difference of measurable electrical quantities in the station is analyzed respectively in the case of heavy and light load. In the case of heavy load, if the fault of the original fault point is not eliminated, the earth branch between the two grounding points will divert the load current, and the formula for the current at the bus grounding point with superimposed load component is derived. The original fault state is judged by whether the current amplitude and phase offset exceed the threshold value. In the case of light load, if the original fault is not eliminated, the two grounding points in the same phase change the zero-sequence path of the system. The zero-sequence current in the fault line is calculated by the symmetrical component method when one point is grounded and two points are grounded, and the original fault state is identified by zero-sequence current offset. The identification procedure and motion flow to identify the original fault state during the grounding of fault phase bus are designed, and the proposed method is simulated and verified by ATP simulation software. This work is supported by National Natural Science Foundation of China (No. 51777067). |
| Key words: neutral non-grounding system single-phase grounding fast fault point transfer method identification of fault state |
