电工技术学报  2019, Vol. 34 Issue (9): 1944-1951    DOI: 10.19595/j.cnki.1000-6753.tces.180573
电力系统 |
输电线路自同步电流差动保护
黄家凯, 高厚磊
电网智能化调度与控制教育部重点实验室(山东大学) 济南 250061
Self-Synchronized Current Differential Protection Scheme for Transmission Line
Huang Jiakai, Gao Houlei
Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of EducationShandong University Ji’nan 250061 China
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摘要 电流差动保护原理简单、可靠性高,但对数据的同步性要求严格,同步误差超过一定限值时会引起误动或拒动。针对电流差动保护常用的动作判据,定性分析了其在内、外部故障时的耐同步误差能力;以故障发生时刻为对时基准,提出了输电线路自同步电流差动保护方案,并对此方案的误差来源、可行性及应用条件等进行了详细的分析与论证;同时,借助现场录波数据和PSCAD仿真结果,对输电线路中自同步电流差动保护方案的可行性进行了验证。理论与仿真分析表明,所述方案不依赖外部时钟,不受通道传输延时和路由变化的影响,在当前技术条件下,其同步误差在允许范围之内,可为输电线路电流差动保护提供一种新的实现方式。
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黄家凯
高厚磊
关键词 输电线路电流差动保护数据同步故障发生时刻自同步    
Abstract:Current differential protection is simple and reliable in principle. But it has a strict requirement for data synchronization, and mal-operation will happen for a large synchronization error. Aiming at common criterion used in line current differential protection, this paper analyzed its ability against synchronization error for internal and external faults firstly. Then refer to fault occurring time, self-synchronized scheme was put forward for transmission line current differential protection. Meanwhile its error sources, feasibility and application conditions were analyzed and demonstrated in detail. After that, using on-site recorded fault data and simulation data, the paper verified the viability of this scheme. Principle investigation and simulations indicate that the proposed scheme can get rid of the dependence on synchronous clock, and be free of the influence of transmission delay and routing change of multiplex channel. Under current technology condition, this scheme’s synchronization error is in the allowable range. Therefore it can be a new choice for realization of line current differential protection.
Key wordsTransmission line    current differential protection    data synchronization    fault occurring time    self-synchronization   
收稿日期: 2018-04-11      出版日期: 2019-05-14
PACS: TM773  
基金资助:国家重点研发计划资助项目(2016YFB0900603)
引用本文:   
黄家凯, 高厚磊. 输电线路自同步电流差动保护[J]. 电工技术学报, 2019, 34(9): 1944-1951. Huang Jiakai, Gao Houlei. Self-Synchronized Current Differential Protection Scheme for Transmission Line. Transactions of China Electrotechnical Society, 2019, 34(9): 1944-1951.
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