The Calculation of Energy Dissipation in Metal Oxide Varistors for Power Distribution Applications

Ky Eugene Merrill, Gerald Thomas Heydt

Research output: Contribution to journalArticle

Abstract

Metal oxide varistors (MOVs) are used in power distribution engineering to suppress lightning and switching surges. Techniques from solid state engineering as well as laboratory experiments have been used to derive models for these devices. The models so derived are combined with circuit models for the distribution system to obtain an integrated, lumped parameter, nonlinear model. The model is used to assess the voltage and current waveshapes in the MOV and to evaluate the energy dissipated in the MOV. The application of such a calculation is illustrated to assess the 'energy rating' of an MOV arrester for an electronically controlled distribution circuit. Comments on the switching time of the MOV are provided: the characteristic time of impact ionization events is typically on the order of femtoseconds to picoseconds.

Original languageEnglish (US)
Article number8721526
Pages (from-to)3967-3969
Number of pages3
JournalIEEE Transactions on Power Systems
Volume34
Issue number5
DOIs
Publication statusPublished - Jan 1 2019

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Keywords

  • energy rating
  • lightning arresters
  • Metal oxide varistors (MOVs)
  • power distribution engineering
  • surge arresters
  • surge suppression
  • zinc oxide

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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