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	Novel criterion of transformer protection based on time difference characteristic between phase voltage and differential current
	Zeng Xiang ; Lin Xiangning ; Weng Hanli ; Sheng Xinfu
	2010-10-12 ; 2010-10-12
关键词	Practical/ fault location power transformer protection transformer cores/ power transformer differential protection time difference characteristics differential current transformer core saturation filter algorithm design fault detection EMTDC-based simulation/ B8350 Transformers and reactors
中文摘要	The differential protection for power transformers features less ratio of proper actuation and slow response, because it severely suffers from false differential current caused by core saturation. Investigation shows that transformer core saturation needs certain time, so emergence time of abrupt differential current of inrush is larger than the time of abrupt change phase voltage. And it can be utilized to distinguish internal faults from external faults. A new criterion for transformer differential protections based on above mentioned time difference is proposed. Furthermore, a novel filter algorithm is designed in order to ensure fast and accurate detecting, effective noise-repressing as well as high-speed response during the instant of variation emergence. The EMTDC-based simulation, which covers various fault situations, is analyzed, and the test results confirm that the criterion can effectively prevent the differential protection from mal-operating and guarantee the high-speed response to the internal fault as well.
语种	中文
出版者	State Power Corporation of China ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78755]
专题	清华大学
推荐引用方式 GB/T 7714	Zeng Xiang,Lin Xiangning,Weng Hanli,et al. Novel criterion of transformer protection based on time difference characteristic between phase voltage and differential current[J],2010, 2010.
APA	Zeng Xiang,Lin Xiangning,Weng Hanli,&Sheng Xinfu.(2010).Novel criterion of transformer protection based on time difference characteristic between phase voltage and differential current..
MLA	Zeng Xiang,et al."Novel criterion of transformer protection based on time difference characteristic between phase voltage and differential current".(2010).

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