Characterization of static electrification in power transformers

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Static electrification due to oil flow causes many field failures of large forced-oil cooled power transformers. Also, in practice under normal operating conditions, the oil volume in these power transformers is reduced due to the internal heat generated (from the energized windings) which accelerates the chemical processes occurring inside. To complete filling of the oil tanks of such transformers, either new oil of the same or different type is used. Laboratory analogs of these transformers; namely a closed and an open cycle, have been used for investigating this phenomenon. Such tests have been performed upon different types of fresh and aged oils and oil mixtures to measure the electrification current. Investigations of the effect of oil temperature, oil velocity, frequency and type of the applied voltage, type of the solid-phase material, and the length of the oil gap are introduced. Also, a 200 kVA, 3.3 kV/380 V distribution power transformer is used where the oil is forced and heated externally to examine and demonstrate this phenomenon for unenergized and energized cases and for both fresh and aged oils.

Original languageEnglish
Pages (from-to)307-315
Number of pages9
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume3
Issue number2
DOIs
Publication statusPublished - 1996

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Power transformers
Oils
Oil tanks

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Characterization of static electrification in power transformers. / Metwally, I. A.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 3, No. 2, 1996, p. 307-315.

Research output: Contribution to journalArticle

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