| 引用本文: | 屠卿瑞,李一泉,曾耿晖,等.母线T区充电操作中母差保护误动风险及应对措施[J].电力系统保护与控制,2017,45(16):157-162. |
| TU Qingrui,LI Yiquan,ZENG Genghui,et al.Protection malfunction risk and preventive solutions when charging T area of busbar[J].Power System Protection and Control,2017,45(16):157-162 |
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| 摘要: |
| 在对220 kV母线T区充电操作中，为防止母差保护大差后备功能误动作切除运行母线或运行支路，需要采取相应的风险防控措施。通过分析国内主流厂家多个型号的母差保护大差后备逻辑，针对不同保护型号和不同工况，提出了缩短对侧后备保护延时、强制模拟盘刀闸位置和短接母差保护对应充电间隔电流互感器(Current Transformer, CT)回路等措施。同时考虑到主变间隔与线路间隔对T区充电时的区别，提出了主变后备保护定值和跳闸矩阵的修改建议。现场实际运行案例证明了所提一、二次应对措施的有效性。 |
| 关键词: 母线T区 大差后备 线路间隔 主变间隔 母线保护 误动 |
| DOI：10.7667/PSPC170027 |
| 分类号: |
| 基金项目:广东电网公司科技项目(GDKJXM20162446);2017年中国电机工程学会青年人才托举工程资助 |
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| Protection malfunction risk and preventive solutions when charging T area of busbar |
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TU Qingrui1,LI Yiquan1,ZENG Genghui1,LIU Wei1,SHI Dongyuan2
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(1. Electric Power Dispatching & Control Center of Guangdong Power Grid, Guangzhou 510000, China;2. Huazhong University of Science and Technology, Wuhan 430000, China)
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| Abstract: |
| When charging the 220 kV busbar T area from other side substation through the transmission line, some type of busbar protection may mis-trip the operating busbar and lines because of the large differential relay’s backup function. In order to prevent this risk, solutions should be taken. The different logics of the majority of busbar protections are analyzed. Several solutions are proposed, such as setting the switch simulation device manually, shortening the operation time of the backup protections, and shortening the CT from the charging equipment to the busbar protection. Considering the differences between the transform T area and this transmission line T area, this paper proposes the method to reset the transformer backup protection setting values. The above solutions to primary and secondary problems are verified by a practical operation case. |
| Key words: busbar T area large area differential backup protection line T area transformer T area bus bar protection malfunction |
