Current-differential protective schemes

  • C. Christopoulos
  • A. Wright


It will be clear from the previous chapter that overcurrent and earth fault protective equipment employing time grading and directional detection cannot provide correct discrimination on all power networks and in many instances the clearance times for some faults would not be acceptable.


Internal Fault Protected Zone Current Transformer Fault Current Earth Fault 
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  1. 1.
    Electrical Review,28 August 1908, The Merz—Price system of automatic protection for high tension circuits.Google Scholar

Further Reading

  1. GEC Measurements, Protective Relays Application Guide (3rd edn), 1987, Chapter 10. Power System Protection,Vol 3, edited by The Electricity Council, 1981, (2nd edn), Peter Peregrinus Ltd.Google Scholar
  2. Royle, J. B. (1990) Differential relay concepts and applications, Canadian Electrical Association — Transaction of Electrical and Operating Division, Vol 29, Paper No. 90-SP-157.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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