Surface Properties of Silicone High Voltage Insulators
The chief advantages of polymeric insulators over conventional porcelain and glass insulators in outdoor high voltage (HV) insulation applications are given by Gorur and Orbeck1 as light weight, superior vandal resistance and better contamination performance. However, polymers are more easily degraded than inert inorganic materials under exposure to discharges and arcing. Corona discharges and dry band arcing occur when the surface of an energized insulator is covered by an electrolytic film formed by the presence of moisture and contamination. The intense localized energy of the dry band arcs can cause material degradation in the form of tracking and erosion. Other environmental factors such as ultraviolet (UV) radiation from sunlight, temperature and flammability must also be considered.
KeywordsContact Angle Corona Discharge Contact Angle Hysteresis Silicone Elastomer PDMS Elastomer
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