Title :
Influence of hydrostatic pressure on morphology and final length of creeping discharges over solid/liquid interfaces under impulse voltages
Author :
Beroual, A. ; Kebbabi, L.
Author_Institution :
Centre de Genie Electr. de Lyon, Ecole Centrale de Lyon, Ecully
fDate :
June 30 2008-July 3 2008
Abstract :
This paper is aimed at the influence of hydrostatic pressure on the morphology and final length of creeping discharges propagating over solid / liquid insulating surfaces in a point-plane electrode arrangement submitted to lightning impulse voltages. Three types of solid insulators (namely polycarbonate, phenoplast resin (Bakelite) and glass), immersed in mineral oil are tested. It is shown that the length of branches constituting the discharges are reduced when the hydrostatic pressure is increased whatever the polarity of the voltage. The final length of discharges Lf increases quasi-linearly with the voltage and decreases when the hydrostatic pressure is increased for both positive and negative polarities as observed elsewhere under AC and DC. On the other hand, for given voltage and pressure, Lf increases with the dielectric constant of solid materials indicating the important role of the capacitive effects in the propagation mechanism.
Keywords :
discharges (electric); glass; insulating oils; permittivity; polymers; Bakelite; capacitive effects; creeping discharges; dielectric constant; glass; hydrostatic pressure; impulse voltages; lightning impulse voltages; mineral oil; morphology; phenoplast resin; point-plane electrode arrangement; polycarbonate; solid-liquid insulating surfaces; solid-liquid interfaces; Dielectric liquids; Electrodes; Lightning; Oil insulation; Optical propagation; Resins; Solids; Surface discharges; Surface morphology; Voltage;
Conference_Titel :
Dielectric Liquids, 2008. ICDL 2008. IEEE International Conference on
Conference_Location :
Futuroscope-Chasseneuil
Print_ISBN :
978-1-4244-1585-4
Electronic_ISBN :
978-1-4244-1586-1
DOI :
10.1109/ICDL.2008.4622472