The effects of hydrostatic pressure and temperature on the electroluminescence in dielectric liquids

7 November 2016

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

p. 60-66
https://doi.org/10.1109/ceidp.1972.7734146

Abstract

There is still no one unified theory which is capable of explaining the following four high-field phenomena beyond doubt: (i) the breakdown strengths of dielectric liquid, gassed or degassed, increase with increasing hydrostatic pressure for pressures between 1 and 20 atmospheres¹ and such a pressure dependence diminishes with decreasing duration of the applied field;² (ii) the conduction currents are independent of hydrostatic pressure up to a guage pressure of 150 lbs/in² for field strengths up to 90% of the normal breakdown stress but the pressure suppresses the current burst;³ (ii) the electron multiplication due to impact ionization does not take place in n-hexane at field strengths up to 1.2 MV/cm;⁴ and (iii) the threshold field for the onset of light emission in n-hexane is less than 90% of the normal breakdown stress and the light always commences in the cathode region regardless of the geometry of electrode systems used. 5 In the following we present some new results of prebreakdown electroluminescent phenomena which may have an important bearing on the mechanisms responsible for electric breakdown in liquids.

Keywords

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