The protection of busbars

  • C. Christopoulos
  • A. Wright


Busbars are vital parts of power networks because they link incoming circuits connected to sources, to outgoing circuits which feed loads. In the event of a fault on a section of busbar all the incoming circuits connected to it must be opened to clear the fault. In practice, because of the amount of interconnection of circuits and the possibility of back feeds from load circuits, all the circuits connected to a faulted section of busbar are disconnected. Such disconnection clearly causes considerable disruption and the greater the operating voltage and current levels of a busbar, the greater will be the loss of supply resulting from a fault. It is therefore necessary that busbars should be so designed and constructed that the incidence of faults occurring on them is reduced to a very low level and it is also essential that the protective schemes applied to busbars are highly discriminative so that they will not wrongly cause a busbar, or a section of it which they are protecting, to be disconnected when faults occur on circuits external to it. In addition, because of the severe and extensive damage which may result from busbar faults it is necessary that they should be detected by protective schemes and then cleared very rapidly.


Protective Scheme Circuit Breaker Protected Zone Current Transformer Fault Current 
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  1. 1.
    Leybum, H. and Lackey, C. H. W. (1952) The protection of electric power systems — a critical review of present-day practice and recent progress, Proc. IEE, 99, (II), 47–66.Google Scholar
  2. 2.
    Low impedance busbar protection MBCZ10 Publication R-4026A, GEC Measurements.Google Scholar
  3. 3.
    Cory, B. J. and Moont, J. F. (1970) Application of digital computers to busbar protection, IEE Conference on the Application of Computers to Power System Protection and Metering, Boumemouth, England, May 70, pp 201–209.Google Scholar
  4. 4.
    Udren, E. A. (1985) An integrated microprocessor based system for relaying and control of substations—design features and testing program, 12th Annual Western Protective Relaying Conference, Spokane, Washington, October 24.Google Scholar
  5. 5.
    Udren, E. A. Protection function, in IEEE Tutorial course on Microprocessor Relays and Protection Systems Course Text 88 EH0269–1-PWR, pp. 43–45.Google Scholar
  6. 6.
    Phadke, A. G. and Thorp, J. S. (1988) Computer relaying for power systems RSP, pp. 182–186.Google Scholar
  7. 7.
    ABB (1995) REB 500 Numerical busbar and breaker-failure protection Publication 1MRB520002-Ben.Google Scholar
  8. 8.
    Ilar, M., Reimann, B. and Brunner, D. (1997) REB500 — Decentralised numerical busbar protection with extended functionality ABB Rev.5 24–32.Google Scholar
  9. 9.
    Siemens, A. G. (1992) 7SS5 Numerical busbar protection, Publication R2.12.1992.Google Scholar

Further Reading

  1. Guide for protective relay applications to power buses, ANSI/IEEE Standard C37.97–1979.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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