Impulse corona inception in dielectric covered rod-plane air gaps

Positive corona inception in dielectric covered rod-plane air gaps stressed by lightning and switching impulse voltages is investigated. Corona inception probability distributions were obtained and the salient characteristics of the corona discharge, namely inception time and voltage, were measured...

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Bibliographic Details
Main Authors: Mavroidis, P.N., Mikropoulos, P.N., Stassinopoulos, C.A.
Format: Conference Proceeding
Language:English
Subjects:
Air gaps
Corona
Dielectric covers
Dielectric measurements
Dielectrics and electrical insulation
Epoxy resins
High Voltage Engineering
Impulse voltages
Length measurement
Lightning
Probability distribution
Surface discharges
Time measurement
Voltage measurement
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Summary:Positive corona inception in dielectric covered rod-plane air gaps stressed by lightning and switching impulse voltages is investigated. Corona inception probability distributions were obtained and the salient characteristics of the corona discharge, namely inception time and voltage, were measured as influenced by the gap length, waveshape of the applied impulse voltage and by the cover material, namely PTFE and epoxy resin. The simple air gaps with a bare rod were regarded as reference. The corona inception voltage increases significantly due to the insulating cover, especially for the PTFE cover under switching voltages. Electric field computations were performed. The corona inception field is, contrary to the inception voltage, lower for the dielectric covered rod-plane than simple rod-plane air gaps; an assisting mechanism for initiatory electrons production is suggested to explain this behaviour.