Ultra-high-speed schemes for the protection of long transmission lines

  • C. Christopoulos
  • A. Wright


It has been made clear in earlier chapters that unit-type protective schemes which compare the quantities at the two ends of transmission lines can provide the necessary discrimination between faults on the circuits they protect and both healthy conditions and faults on other circuits. Such schemes cannot however operate extremely rapidly because time must be allowed for the interchange of signals between the ends of the protected lines.


Transmission Line Protective Scheme Characteristic Impedance Phase Conductor Current Wave 
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Further Reading

  1. McLaren, P. G., Travelling wave and ultra high speed (UHS) relays Chapter 6 in IEE Tutorial Course-Microprocessor relays and protection systems (ed M. S. Sachdev), 88 EH 0269–1-PWR.Google Scholar
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  5. Crossley, P. A., Elson, S. F., Rose, S. J. and Williams, A. (1989) The design of a directional comparison protection for ehv transmission lines, Fourth International Conference on Developments in Power System Protection, IEE Conf Publ. 302, pp. 151–155.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • C. Christopoulos
    • 1
  • A. Wright
    • 1
  1. 1.University of NottinghamNottinghamUK

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