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Influence of Low Order Harmonic Phase Angles on Tripping Time of Overcurrent Relays

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Date
2008
Type
Conference Paper

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Masoum, Mohammad and Masoum, Ali and Masoum, A. 2008. Influence of Low Order Harmonic Phase Angles on Tripping Time of Overcurrent Relays, in 40th North American Power Symposium 2008, Sep 28 2008. Calgary, Alberta, Canada: University of Calgary.
Source Title
Proceedings of the 40th North American Power Symposium 2008
Source Conference
40th North American Power Symposium 2008
Faculty
Department of Electrical and Computer Engineering
School of Engineering
Faculty of Science and Engineering
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Abstract

Experimental analyses are used to investigate the impact of low order harmonics on the operation and tripping times of overcurrent relays. Two analytical approaches based on relay characteristics provided by the manufacturer and simulations using PSCAD software package are used to estimate tripping times under non-sinusoidal operating conditions. Experiments were conducted such that the order, magnitude and phase angle of harmonics could be controlled by employing a computer-based single-phase harmonic source. Computed and measured tripping times are compared and suggestions on the application of overcurrent relays in harmonically polluted environments are provided.