SOLID-STATE WRONG-PHASE-COUPLING RELAY FOR THE PROTECTION OF 25 KV A. C. TRACTION SYSTEM

The paper describes a solid-state wrong-phase-coupling relay developed for the protection of 25-kV 50-Hz single-phase traction system of the Indian Railways. A restricted-directional characteristic has been selected in place of the presently used admittance characteristic of the electromechanical relay. A dual phase-comparator based on block-spike coincidence has been employed. In addition to the comparator details, several practical design aspects, covering dc supplies, replica impedance, surge protection of circuits, etc. are discussed in the paper. Results of the performance tests conducted in the laboratory to determine the steady state and dynamic characteristics, behavior on low voltage and current signals, operating time and effect of frequency variation have been found very satisfactory, and are reported and analyzed.

  • Corporate Authors:

    Institute of Electrical and Electronics Engineers

    3 Park Avenue, 17th Floor
    New York, NY  USA  10016-5997
  • Authors:
    • Verma, H K
    • Rao, T S
  • Publication Date: 1977

Media Info

  • Features: References;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00180319
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Pap A 78314-7 Preprint
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM