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New static 3-step distance relay

Parthasarathy, K (1966) New static 3-step distance relay. In: Proceedings of the Institution of Electrical Engineers, 113 (4). pp. 633-640.

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A new static 3-step distance relay based on the principle of multi-input phase comparison is described in the paper. Design principles and typical discriminating and logic circuits are described for the new relaying system. The relaying system uses semiconductor circuits throughout and features high speed and good performance. The comparator model, which effects multi-input phase comparison, has been devised to provide reliable pickup for closein faults, and to achieve an improved polar characteristic in the complex- impedance plane, which fits around only the fault area of a transmission line. Operating time of the relay is less than 1 cycle for unbalanced faults, and less than a halfcycle for 3-phase faults. Protective circuits have also been added to detect power swing and to block tripping for a predetermined number of power-swing cycles. The operating characteristics of the relay, as expressed by accuracy/range charts, are presented.

Item Type: Journal Article
Publication: Proceedings of the Institution of Electrical Engineers
Publisher: IEEE
Additional Information: Copyright 1966 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 05:27
Last Modified: 05 Jan 2012 05:27
URI: http://eprints.iisc.ac.in/id/eprint/43045

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