Identifying Transformer Inrush Current Based on Normalized Grille Curve

Author

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

Author_Institution

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

Volume

26

Issue

2

fYear

2011

fDate

4/1/2011 12:00:00 AM

Firstpage

588

Lastpage

595

Abstract

A novel algorithm for discrimination between inrush currents and internal fault currents by utilizing the normalized grille curve is proposed. First, the calculation method of the normalized grille curve is presented. Then, two schemes to discriminate the inrush currents from the internal faults in the time and frequency domains are, respectively, developed. A total of 268 experimental measurements have been tested on an YNd11-connected transformer. The results indicate that the proposed technique is able to reliably and accurately distinguish inrush currents from internal faults with easy implementation. Furthermore, the new method is not affected by the saturation of current transformers.

Keywords

current transformers; fault currents; power transformers; YNd11-connected transformer; current transformers; internal fault currents; normalized grille curve; transformer inrush current; Circuit faults; Current transformers; Frequency domain analysis; Power transformers; Surge protection; Surges; Time domain analysis; Inrush currents; internal faults; normalized grille curve; power transformer;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2010.2101087

Filename

5706395