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

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。...

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Published in电力系统保护与控制 Vol. 45; no. 20; pp. 44 - 51
Main Author 戚宣威 李露 黄晓明 王松 裘愉涛 尹项根
Format Journal Article
LanguageChinese
Published 国网浙江省电力公司电力科学研究院,浙江杭州,310014%长沙理工大学电气与信息工程学院,湖南长沙,410076%国网浙江省电力公司,浙江杭州,310007%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 2017
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ISSN1674-3415
DOI10.7667/PSPC201740

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Summary: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。
Bibliography:current transformer; transient saturation; differential protection; transformer
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)
41-1401/TM
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 l
ISSN:1674-3415
DOI:10.7667/PSPC201740