| 引用本文: | 陈 军,隋佳闽,赵子涵,等.输电线路断线故障保护逻辑分析及附加判别方法[J].电力系统保护与控制,2022,50(4):112-119.[点击复制] |
| CHEN Jun,SUI Jiamin,ZHAO Zihan,et al.Protection logic analysis and additional judgment method of a transmission line break fault[J].Power System Protection and Control,2022,50(4):112-119[点击复制] |
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| 摘要: |
| 目前架空输电线路继电保护装置针对断线故障缺乏快速、准确的识别方法，导致断线故障判决、处理不及时，容易引起关联设备损坏及重大安全事故。针对断线故障后主保护和后备保护动作逻辑进行分析，阐释距离保护和零序电流保护拒动机理，并进一步提出输电线路断线故障的快速判别方法。该方法利用输电线路断线后线路两侧故障相的电压、电流变化特征构建附加断线保护判据，实现了对简单断线故障和断线再接地故障的快速识别和保护。最后，通过PSCAD输电网仿真分析和四川省某水电外送线路实例测试，验证了断线故障附加判别和保护方法的可行性和有效性。 |
| 关键词: 输电线路 断线故障 距离保护 零序电流保护 故障识别 |
| DOI：DOI: 10.19783/j.cnki.pspc.210503 |
| 投稿时间：2021-04-29修订日期：2021-07-11 |
| 基金项目:国家重点研发计划项目资助(2018YFB0905000)；国网四川省电力公司科技项目资助(1200/2019-26001B) |
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| Protection logic analysis and additional judgment method of a transmission line break fault |
| CHEN Jun,SUI Jiamin,ZHAO Zihan,YANG Xiangfei,XIANG Bo,YI Jianbo |
| (1. State Grid Sichuan Electric Power Company Dispatching Control Center, Chengdu 610041, China;
2. Laboratory of Wide-area Measurement and Control on Power System of Sichuan Province,
University of Electronic Science and Technology of China, Chengdu 611731, China) |
| Abstract: |
| There is a lack of a fast and accurate identification method for the broken line fault on a relay protection device on an overhead transmission line. This means that judgment and treatment of the fault is not likely to be timely, and it is easy for associated equipment damage to be caused as well as major safety incidents. This paper analyzes the action logic of main and backup protection after a line break fault, explains the mechanism of why distance and zero sequence current protection may refuse to operate, and puts forward a fast identification method for the fault. Based on the variation characteristics of voltage and current of fault phases on both sides of transmission line after a line break, an additional line break protection criterion is constructed to realize the fast identification and protection scheme of both a simple line break fault and a line break re grounding fault. Finally, through PSCAD transmission network simulation analysis and a case test of a hydropower transmission line in Sichuan Province, the feasibility and effectiveness of the proposed method are verified.
This work is supported by the National Key Research and Development Program of China (No. 2018YFB0905000). |
| Key words: transmission line line break fault distance protection zero sequence current protection fault identification |
