750kV变压器保护配置及整定计算探讨_张健康.pdfVIP

第43 卷 第 9 期 电力系统保护与控制 Vol.43 No.9 2015 年 5 月 1 日 Power System Protection and Control May 1, 2015 750 kV 变压器保护配置及整定计算探讨 1 1 2 张健康 ，粟小华 ，夏 芸 (1.国家电网西北电力调控分中心，陕西 西安 710048；2.北京中恒博瑞数字电力科技有限公司 北京 100096) 摘要：750 kV 电网作为西北地区主网架目前正处于快速发展期。结合 750 kV 变压器特点，分析了差动保护与各 侧后备保护的配置原则及应注意的问题。考虑到 750 kV 变压器差动保护配置较为完备，明确变压器区内故障主要 依靠差动保护切除，而后备保护主要用于反应本侧母线及线路出口故障。协调区外出口附近故障的灵敏性、快速 性与选择性的矛盾是变压器后备保护整定计算的关键。在此基础上，提出了 750 kV 变压器保护的整定方案，并就 阻抗保护适用性、差动保护完善、后备保护简化及变压器保护自动整定等问题进行了探讨。本方案已在西北 750 kV 变压器保护中获得应用。 关键词：750 kV 变压器；差动保护；后备保护；阻抗保护；整定计算 Discussion on protection configuration and setting calculation for 750 kV transformer 1 1 2 ZHANG Jiankang , SU Xiaohua , XIA Yun (1. Northwest Electric Power Dispatching and Control Sub-center of State Grid, Xi’an 710048, China; 2. Join Bright Digital Power Technology Co., Ltd., Beijing 100096, China) Abstract: 750 kV grid as the main grid of Northwest China is now in rapid development period. On the basis of the characteristics of 750 kV transformer, the protection configuration and its related problems are analyzed. Considering that the differential protection of 750 kV transformer is quite perfect, the internal fault is mainly dependent on the differential protection to remove and the backup protection is primarily responsible for external faults at the bus and the local end of the adjacent lines. To meet the requirements for sensitivity and speed at external local faults without losing selectivity is the key issue for setting calculation in transformer backup pro