New approach to distance relays with quadrilateral polar characteristic for e.h.v.-line protection

Anil Kumar, NM (1970) New approach to distance relays with quadrilateral polar characteristic for e.h.v.-line protection. In: Proceedings of the Institution of Electrical Engineers, 117 (10). pp. 1986-1992.

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Abstract

A new technique is presented using principles of multisignal relaying for the synthesis of a universal-type quadrilateral polar characteristic. The modus operandi consists in the determination of the phase sequence of a set of voltage phasors and the provision of a trip signal for one sequence while blocking for the other. Two versions, one using ferrite-core logic and another using transistor logic, are described in detail. The former version has the merit of simplicity and has the added advantage of not requiring any d.c. supply. The unit is flexible, as it permits independent control of the characteristic along the resistance and reactance axis through suitable adjustments of replica impedance angles. The maximum operating time is about 20ms for all switching angles, and with faults within 95% of the protected section. The maximum transient overreach is about 8%.

Item Type:	Journal Article
Publication:	Proceedings of the Institution of Electrical Engineers
Publisher:	IEEE
Additional Information:	Copyright 1970 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	05 Jan 2012 05:29
Last Modified:	05 Jan 2012 05:29
URI:	http://eprints.iisc.ac.in/id/eprint/43044

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