Investigation on Discharge Pattern of Fluorinated Liquid under Boiling Condition

The phase-change cooling technology shows its superiority on transient heat dissipation of electronic device, such as IC. It was furtherly investigated to apply this technology to some electric apparatus like generator and power rectifier. In order to fully utilize the capability of phase-change cooling technology in cooling applications of HV power electric apparatus, it is necessary to verify the partial discharge (PD) suppression capability of the phase-change cooling liquid dielectric and the insulation effect caused by the bubble under boiling conditions. In this paper, the partial discharge characteristics of fluorinert dielectric liquid under the nonuniform field are studied with a modified test chamber. The partial discharge signals with and without bubbles are measured and analyzed in detail. The effect of bubble on the partial discharge characteristics under boiling condition is explored. Furthermore, it is revealed that the effects of applied voltage on the bubble motion and PD parameters.