A Two Terminal Network-Based Method for Discrimination Between Internal Faults and Inrush Currents

Author

Ma, Jing ; Wang, Zengping ; Yang, Qixun ; Liu, Yilu

Author_Institution

Sch. of Electr. & Electron. Eng., North China Electr. Power Univ., Beijing, China

Volume

25

Issue

3

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

1599

Lastpage

1605

Abstract

A novel scheme based on two-terminal network to distinguish the inrush current from the internal fault current in the power transformer is proposed. By eliminating the mutual flux linkage in the transformer loop equation, a two-terminal network containing only the winding resistance and the leakage inductance is generated. According to the absolute difference of active power (ADOAP) flowing into and consumed by the two-terminal network, the criterion to identify the internal fault is developed. A total of 162 experimental cases have been tested and the proposed method is able to reliably and accurately discriminate internal faults from inrush currents with easy implementation.

Keywords

fault currents; power transformers; absolute difference of active power; inrush currents; internal fault current; mutual flux linkage elimination; power transformer; transformer loop equation; two terminal network-based method; Inrush current; internal fault; power transformer; two-terminal network;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2009.2036262

Filename

5356175