Improved operation of differential protection of power transformers for internal faults

Author

Liu, Pei ; Malik, O.P. ; Chen, Deshu ; Hope, G.S. ; Guo, Yong

Author_Institution

Dept. of Electr. Power Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China

Volume

7

Issue

4

fYear

1992

fDate

10/1/1992 12:00:00 AM

Firstpage

1912

Lastpage

1919

Abstract

The possibility of nonoperation of second-harmonic restraint differential protection in the case of internal faults of power transformers was studied. The smaller the setting for harmonic restraint, the longer will likely be the time delay in the operation of the relay. To study this aspect, various internal faults and inrush conditions were tested on a physical model of a three-phase transformer in the laboratory. The data were analyzed by different protection algorithms. Based on the results of these studies, modified schemes for improved operation for internal faults are presented

Keywords

electrical faults; harmonics; power transformers; transformer protection; differential protection; inrush conditions; internal faults; power transformers; second-harmonic restraint; Algorithm design and analysis; Capacitance; Circuit faults; Phase transformers; Power system harmonics; Power system modeling; Power system protection; Power system relaying; Power transformers; Surge protection;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.156994

Filename

156994