Experimental Comparisons of Susceptibilities to Long-term Action of AC Corona and Ozone of Non-ceramic Outdoor Insulation Materials
Paper in proceeding, 2009

By utilizing the multiple-needle electrode system selected by CIGRE working group WG D1.14, the influences of long-term AC corona discharge and ozone on the surface and volume resistivities as well as on the dielectric response of well defined non-ceramic outdoor insulation material samples were experimentally investigated and compared. The polymeric specimens concerned were obtained from five various materials used as housings of composite insulators, namely liquid silicone rubber (LSR), high temperature vulcanized silicone rubber (HTV), ethylene propylene diene monomer (EPDM) rubber and ethylene-vinyl acetate (EVA) rubber and hydrophobic cycloaliphatic epoxy (HCEP resin). External mechanical stress was applied as additional stress factor during corona-ozone exposure of the elastomeric materials. It was found as a result of the testing that, the 100-hour long corona-ozone exposure had obvious effects on both surface and volume resisitivities for all the materials investigated; surface resistivity was more sensitive than volume resistivity. The permittivity as well as the dissipation factor values, both being the electrical properties of the material bulk, did not exhibit a high susceptibility to the exposure.

housing material

corona

ozone

composite insulation

outdoor insulation

Author

Bin Ma

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Johan Andersson

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Stanislaw Gubanski

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

2009 Nordic Insulation Symposium, June 2009, Gothenburg, Sweden

221-224

Subject Categories

Other Materials Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

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Created

10/8/2017