Effect of long-term corona on non-ceramic outdoor insulator housing materials

V. M. Moreno, R. S. Gorur

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

The influence of long-term corona on the degradation of non-ceramic composite insulator (NCI) housing materials was studied. Polymer samples were obtained from full-scale NCI, employing three different housing materials, namely silicone rubber (SIR), ethylene propylene diene monomer (EPDM) rubber and a blend of EPDM with silicone rubber. The effect of relative humidity and externally applied mechanical stress as acceleration factors was assessed. Several modes of degradation were observed, namely, cracking, roughening, and discoloration. In general, the severity of degradation increased with the relative humidity level and application of mechanical stress. Periodic monitoring of corona discharge magnitude and pulse repetition rate allowed for a simplistic computation of the energy needed for initiation of surface changes. A comparison of these calculated values with expected conditions in the field was made. It is postulated that even under severe operating conditions over a period of many years, degradation of the housing materials evaluated due to water droplet corona is highly unlikely.

Original languageEnglish (US)
Pages (from-to)117-128
Number of pages12
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume8
Issue number1
DOIs
StatePublished - Feb 2001

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Degradation
Rubber
Silicones
Propylene
Atmospheric humidity
Ethylene
Monomers
Discoloration
Pulse repetition rate
Composite materials
Monitoring
Polymers
Water

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Effect of long-term corona on non-ceramic outdoor insulator housing materials. / Moreno, V. M.; Gorur, R. S.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 8, No. 1, 02.2001, p. 117-128.

Research output: Contribution to journalArticle

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