Application of block pulse functions for digital protection of power transformers

Author

Kolla, S.R.

Author_Institution

Dept. of Electr. Eng., Toledo Univ., OH, USA

Volume

31

Issue

2

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

193

Lastpage

196

Abstract

The author describes an application of block pulse functions for digital protection of power transformers. Digital relay algorithms are developed to extract fundamental and second-harmonic components. These components are then used for harmonic restraint differential protection of transformers. In comparison with the algorithms based on the Walsh and Haar functions, the proposed method is computationally simple and can be used with any sampling frequency. It is concluded that offline testing of the method with simulated inrush and internal fault current data clearly indicate that the method can provide fast and reliable trip decision. The method is suitable for microprocessor-based protective relays

Keywords

computerised signal processing; filtering and prediction theory; power system protection; power transformers; Haar functions; Walsh function; block pulse functions; digital protection; digital relay algorithms; harmonic restraint differential protection; internal fault current data; microprocessor-based protective relays; offline testing; power transformers; sampling frequency; simulated inrush; trip decision; Computational modeling; Digital relays; Fault currents; Frequency; Power transformers; Protective relaying; Pulse transformers; Sampling methods; Surge protection; Testing;

fLanguage

English

Journal_Title

Electromagnetic Compatibility, IEEE Transactions on

Publisher

ieee

ISSN

0018-9375

Type

jour

DOI

10.1109/15.18790

Filename

18790