Application of Haar functions for transmission line and transformer differential protection

Fakruddin, DB and Parthasarathya, K and Hoggb, BW and Jenkinsa, L (1984) Application of Haar functions for transmission line and transformer differential protection. In: International Journal of Electrical Power & Energy Systems, 6 (3). pp. 169-180.

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Abstract

The development of algorithms, based on Haar functions, for extracting the desired frequency components from transient power-system relaying signals is presented. The applications of these algorithms to impedance detection in transmission line protection and to harmonic restraint in transformer differential protection are discussed. For transmission line protection, three modes of application of the Haar algorithms are described: a full-cycle window algorithm, an approximate full-cycle window algorithm, and a half-cycle window algorithm. For power transformer differential protection, the combined second and fifth harmonic magnitude of the differential current is compared with that of fundamental to arrive at a trip decision. The proposed line protection algorithms are evaluated, under different fault conditions, using realistic relaying signals obtained from transient analysis conducted on a model 400 kV, 3-phase system. The transformer differential protection algorithms are also evaluated using a variety of simulated inrush and internal fault signals.

Item Type:	Journal Article
Publication:	International Journal of Electrical Power & Energy Systems
Publisher:	Elsevier science
Additional Information:	Copyright for this article belongs to Elsevier science.
Keywords:	Electric power system protection; online control strategies; Haar functions.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	22 Jul 2009 06:09
Last Modified:	19 Sep 2010 05:38
URI:	http://eprints.iisc.ac.in/id/eprint/21691

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