A current-based solution for transformer differential protection. II. Relay description and evaluation

Author

Guzmán, Armando ; Zocholl, Stanley ; Benmouyal, Gabriel ; Altuve, Héctor J.

Author_Institution

Schweitzer Eng. Labs., Pullman, WA, USA

Volume

17

Issue

4

fYear

2002

fDate

10/1/2002 12:00:00 AM

Firstpage

886

Lastpage

893

Abstract

For pt.I see ibid., vol.16, p.485-91 (2001). This paper describes a new approach for transformer differential protection that ensures security for external faults, inrush, and overexcitation conditions and provides dependability for internal faults. This approach combines harmonic restraint and blocking methods with a wave-shape recognition technique. We compare in the paper the behavior of some traditional transformer protection methods to that of the new method for real cases of magnetizing inrush conditions.

Keywords

magnetisation; power transformer protection; relay protection; blocking methods; external faults; harmonic restraint; magnetizing inrush conditions; overexcitation conditions; transformer differential protection; transformer protection methods; wave-shape recognition technique; Circuit faults; Fault currents; Magnetic analysis; Power transformers; Protective relaying; Relays; Saturation magnetization; Security; Subspace constraints; Surge protection;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2002.803736

Filename

1046859