引用本文:戚宣威,李露,黄晓明,等.区外故障导致变压器电流互感器饱和及差动保护误动问题研究[J].电力系统保护与控制,2017,45(20):44-51.
QI Xuanwei,LI Lu,HUANG Xiaoming,et al.Study on the CT saturation and mal-operation of the transformer current differential protection during external faults[J].Power System Protection and Control,2017,45(20):44-51
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区外故障导致变压器电流互感器饱和及差动保护误动问题研究
戚宣威1,李 露2,黄晓明1,王 松1,裘愉涛3,尹项根4
(1.国网浙江省电力公司电力科学研究院，浙江 杭州 310014;2.长沙理工大学电气与信息工程学院， 湖南 长沙 410076;3.国网浙江省电力公司，浙江 杭州 310007;4.强电磁工程与 新技术国家重点实验室(华中科技大学)，湖北 武汉 430074)
摘要:
2016年以来，电网接连发生多起区外故障期间变压器差动保护误动的事件，严重威胁电力系统的安全稳定运行与电能的可靠供应。从理论研究、数字仿真以及现场录波数据分析等层面围绕误动原因展开了深入研究，结果表明P类互感器在区外故障期间发生暂态饱和是导致保护误动的主要原因。在此基础上，分析论证了有关的互感器饱和识别方法，并探讨了互感器选型需要考虑的多种因素。该研究旨在引起相关专家学者对于互感器暂态饱和问题的关注，并为针对该问题的分析思路与应对方法提供参考与借鉴。
关键词:  电流互感器  暂态饱和  差动保护  变压器
DOI：10.7667/PSPC201740
分类号:
基金项目:国家电网公司总部科技项目“基于故障暂态分量时频特征的线路保护原理研究”(5211DS17002J)
Study on the CT saturation and mal-operation of the transformer current differential protection during external faults
QI Xuanwei1,LI Lu2,HUANG Xiaoming1,WANG Song1,QIU Yutao3,YIN Xianggen4
(1. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China;2. College of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410076, China;3. State Grid Zhejiang Electric Power Company, Hangzhou 310007, China;4. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China)
Abstract:
Several cases of unusual mal-operation of the differential protection for transformer occurred in the power gird in 2016, threatening the stable operation of the power grid and the reliability of the power supply seriously. The mal-operation reason is researched in detail based on the mathematical analysis, the digital simulation and the field recorded fault data analysis. It is disclosed that the P-class CT transient saturation leads to the mal-operation. On this basis, this paper analyses the performance of the CT saturation method, and discusses the CT selection principles. This paper aims at attracting the attention on the problem of the CT saturation and proposing the reference of the analysis method and the countermeasure for this problem.
Key words:  current transformer  transient saturation  differential protection  transformer
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