Research on sympathetic interaction between transformers

Author

Shao, Dejun ; Yin, Xianggen ; Zhang, Zhe ; Chen, Deshu ; Zhang, Kanjun

Author_Institution

Huazhong Univ. of Sci. & Technol., Wuhan

fYear

2007

fDate

4-6 Sept. 2007

Firstpage

273

Lastpage

276

Abstract

The phenomenon of sympathetic interaction between transformers is discussed in this paper. A mathematical model is developed for two transformers in parallel and in series operation to analyze the origin mechanism of sympathetic interaction. At the same time, its characteristics are further analyzed by numerical simulation. The sympathetic inrush current could influence the transformer differential protection. The physical dynamic simulation experiment results are analyzed, which prove the second harmonic restrain method could restrain the sympathetic inrush and the CT saturation criterion should be used for the differential protection.

Keywords

current transformers; power transformer protection; CT saturation criterion; dynamic simulation; numerical simulation; second harmonic restrain method; sympathetic inrush current; sympathetic interaction; transformer differential protection; Equations; Equivalent circuits; Fault currents; Inductance; Magnetic analysis; Magnetic circuits; Magnetic flux; Saturation magnetization; Surge protection; Transformers; magnetizing inrush; sympathetic interaction; transformer differential protection;

fLanguage

English

Publisher

ieee

Conference_Titel

Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International

Conference_Location

Brighton

Print_ISBN

978-1-905593-36-1

Electronic_ISBN

978-1-905593-34-7

Type

conf

DOI

10.1109/UPEC.2007.4468959

Filename

4468959