Multimode wave theory application to the analysis of very fast transients in lossless systems

A. S. Farag, Ya Ping Du, F. Wang, T. C. Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review


This paper presents a new method of analyzing very fast transients in power systems by including the higher modes in the wave propagation analysis which, if ignored, can lead to erroneous results. A characteristic matrix is introduced to characterize the mode reflections and couplings to replace the scalar reflection and transmission coefficients used in the conventional traveling wave method. A sample transient calculation is carried out for a lossless coaxial cable terminated with a circular waveguide which shows the necessity to consider higher modes in very fast transient studies. The proposed approach also applies to more complicated structures such as gas insulated substations.
Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalElectric Power Systems Research
Issue number1
Publication statusPublished - 1 Jul 1996
Externally publishedYes


  • Electromagnetic waves
  • Lossless power systems
  • Substations
  • Switchgear
  • Transmission coefficients
  • Very fast transients

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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