| 引用本文: | 姜宪国,刘 宇,周泽昕,杜丁香,李仲青.同塔双回线接地距离保护零序电流补偿系数分析及整定方法改进[J].电力自动化设备,2015,35(8): |
| JIANG Xianguo,LIU Yu,ZHOU Zexin,DU Dingxiang,LI Zhongqing.Analysis of zero-sequence current compensation coefficient and improvement of setting method for grounding distance protection of dual-loop lines on same tower[J].Electric Power Automation Equipment,2015,35(8): |
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| 摘要: |
| 比较了4种典型运行方式下双回线零序补偿系数K的大小，分析了目前单、双K值整定方法的特性。分析发现：单K值整定中，当整定阻抗达到一定值时，可能导致保护误动和拒动；双K值整定针对不同段保护采用不同K值，理论上更为合理。现行双K值整定方法中，接地距离保护Ⅰ段采用的K值并非为各种运行方式下的最小K值，在双回线一端母线解列时存在误动风险，对此提出采用一回线检修运行方式下的K值和一端母线解列运行方式下的最小K值的加权平均值作为接地距离Ⅰ段零序补偿系数。仿真结果表明，改进的双K值整定方法性能优于传统单、双K值整定方法，能够兼顾接地距离保护Ⅰ段的可靠性和接地距离保护Ⅱ段的灵敏度。 |
| 关键词: 同塔双回线 继电保护 接地距离保护 运行方式 零序电流补偿系数 整定 可靠性 灵敏度 |
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| Analysis of zero-sequence current compensation coefficient and improvement of setting method for grounding distance protection of dual-loop lines on same tower |
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JIANG Xianguo1, LIU Yu2, ZHOU Zexin1, DU Dingxiang1, LI Zhongqing1
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1.State Key Laboratory for Security and Energy Saving，China Electric Power Research Institute，Beijing 100192，China;2.National Power Dispatching & Communication Centre，Beijing 100031，China
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| Abstract: |
| The zero-sequence current compensation coefficient K of dual-loop lines on same tower is compared among four typical operating modes and the characteristics of single-K setting and dual-K setting are analyzed，which show that，the single-K setting may cause the improper operation of protection when the impedance setting reaches a certain value，while the dual-K setting is theoretically more reasonable because different values of K are set for different protection zones. Since the compensation coefficient set by the present dual-K setting for zone- Ⅰ of grounding distance protection is not the minimum among all operating modes，which may cause the maloperation of protection when one terminal of dual-loop lines is disconnected，it is proposed to take the weighted average of the compensation coefficient when one loop is in maintenance mode and the minimum compensation coefficient when one terminal of dual-loop lines is disconnected as the zero-sequence current compensation coefficient for zone- Ⅰ of grounding distance protection. Simulative results demonstrate that，the improved dual-K setting gives consideration to both the reliability of zone- Ⅰ and the sensitivity of zone - Ⅱ，with better performance than that of traditional single- or dual-K setting. |
| Key words: dual-loop lines on same tower relay protection grounding distance protection operating mode zero-sequence current compensation coefficient setting reliability sensitivity |
