Protection Systems with Phasor Inputs

  • A.G. Phadke
  • J.S. Thorp
Part of the Power Electronics and Power Systems book series (PEPS)


Synchronized phasor measurements have offered solutions to a number of vexing protection problems. These include the protection of series compensated lines, protection of multiterminal lines, and the inability to satisfactorily set out-of-step relays. In many situations the reliable measurement of a remote voltage or current on the same reference as local variables has made a substantial improvement possible. In some examples communication of such measurements from one end of a protected line to the other is all that is required while in others communication across large distances is necessary.

Phasor measurements are particularly effective in improving protection functions which have relatively slow response times. For such protection functions, the latency of remote measurements is not a significant issue. For example, back-up protection functions of distance relays and protection functions concerned with managing angular or voltage stability of networks can benefit from...


Power System Phasor Measurement Unit Voltage Collapse Differential Protection Flexible Alternate Current Transmission System 
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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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • A.G. Phadke
    • 1
  • J.S. Thorp
    • 1
  1. 1.Virginia Polytechnic Institute and State UniversityBlacksburgUSA

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