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Title: Adaptive application of impedance estimation algorithms in distance relaying
Authors: Zhang, Z
Li, KK
Yin, XG
Chen, DS
Keywords: Electric impedance
Frequency response
Frequency-domain analysis
Parameter estimation
Power transmission lines
Power transmission protection
Relay protection
Time-domain analysis
Issue Date: 2000
Publisher: IET
Source: 2000 International Conference on Advances in Power System Control, Operation and Management, 2000 : APSCOM-00, 30 October-1 November 2000, v. 1, p. 269-274 How to cite?
Abstract: The distance relay is one of the most important elements of EHV and UHV transmission line protection systems. A practical way to improve the performance of a distance relay is to adopt inverse-time operational characteristics within its first protected zone. For a digital relay, the accomplishment of inverse-time characteristics requires a suitable variable data-window filtering algorithm. In this paper, several typical variable data-window algorithms are evaluated and compared both in frequency domain and time domain. A new frequency-response analysis approach is developed in which the comprehensive filtering performances of the variable data-window algorithms are obtained. Based on the results of frequency response analysis and simulation tests, some adaptive techniques are proposed to achieve better estimation performance.
ISBN: 0-85296-791-8
DOI: 10.1049/cp:20000405
Appears in Collections:Conference Paper

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