NDLI: Electric field calculations on a high voltage insulator under wet conditions

Content Provider	IEEE Xplore Digital Library
Author	Sarang, B. Lakdawala, V. Basappa, P.
Copyright Year	2009
Description	Author affiliation: Norfolk State University, Virginia, USA (Basappa, P.) \|\| Old Dominion University, Virginia, USA (Sarang, B.; Lakdawala, V.)
Abstract	Occurrence of water droplets on outdoor insulators either due to rain, fog, dew etc. leads to localized field enhancement causing partial discharges and dry arcs which ultimately results in complete flashover. Presence of a hydrophobic coating (e.g. RTV coating) inhibits the formation of water films and hence lead to formation of discrete water particles which are less dangerous. In this paper two cases are investigated. The first case refers to the hydrophobic case where water droplets reside as discrete droplets on Silicon Rubber (SIR). The second case is when water droplets coalesce and form a film due to the diminution of the hydrophobic property. The first set of simulations inquired the role of single, multiple discrete water droplets on the shed and the sheath region in enhancing the E-Field. The second set of simulations looked into effect of the water films on the shed region. A High Voltage insulator (138KV) made of SIR is considered to perform the Electric Field Calculations. The first set of results indicates that the water droplets in the sheath region greatly contribute towards enhancing the probability of initiation and progression of wet flashover on insulator surface. The second set of simulations revealed that the E-Field intensification is more when there is abatement of hydrophobic property on the SIR insulators when compared to the discrete droplets case. Simulation was done with the help of a 3D Electric Field Analysis package called COULOMB.
Starting Page	86
Ending Page	90
File Size	369631
Page Count	5
File Format	PDF
ISBN	9781424439157
DOI	10.1109/EIC.2009.5166327
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-31
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Dielectrics and electrical insulation Flashover Coatings Rain Partial discharges Silicon Rubber Water Analytical models
Content Type	Text
Resource Type	Article

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