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Distance-type protective schemes for overhead lines and cables

  • C. Christopoulos
  • A. Wright
Chapter

Abstract

In Chapters 7–10 various schemes which are used to protect overload lines and cables have been considered. All of these schemes are of the unit type in that they should operate whenever faults above certain levels of current occur on the protected units, i.e. between the current transformers mounted at each of the ends of the units, and they should not operate when external faults are present or during any healthy conditions. In each case this desired performance is obtained by making use of information about the conditions at both ends of a protected unit at any time. As examples, the instantaneous input and output currents of lines are compared in current-comparison (Merz-Price) schemes, the phases of currents are compared in ‘phase-comparison’ schemes and the directions of currents are taken into account in interlock schemes. To effect the necessary comparisons, signals must be sent between the ends of protected units which may, of course, be quite long distances apart, and either pilot wires or optical fibres or other high frequency electronic communication equipment may be required for this purpose.

Keywords

Input Impedance Measuring Element Current Transformer Fault Current Overhead Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Further Reading

  1. Analysis of distance protection, V. Cook, RSP 1986, 188 pages.Google Scholar
  2. Protection aspects of multi-terminal lines, IEE Power Eng. Soc. Publ, IEEE Report No79, TH 0056–2-PWR, 1979, pp. 1–17.Google Scholar
  3. Determination of time settings in a distance protection scheme based on statistical methods, J. De Haas, CIGRE-report 31–05. 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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