A Study of Spatial distribution of the Electric Field under the Influence of Temperature with DC Supply

Partial discharge, space charge and electric ion fields are phenomena that are responsible for flashovers on transmission lines and most of time cause power losses. These consequences lead to interruptions and loss of power supply. Atmospheric conditions in general and the temperature in particular is still not fully understood under DC excitation, especially when the applied voltage approached the critical breakdown value. Temperature has a great influence on corona discharge. In this study, the impact of temperature on the spatial distribution of the electric field, which can also be considered as one space charge source under DC supply was studied. A laboratory size corona cage with an aluminum tern conductor at its center, for the experiments in the high voltage laboratory. The purpose of this study was to investigate the effect of the temperature on the spatial distribution on the DC conductor with the maximum DC voltage applied of ±175 kV and have a better understanding of the major factors that influence the spatial distribution processes under a high temperature. The corona camera version 8 (CoroCam8) was used to visualize the spatial distribution around the conductor. This has enabled to observe the effect of the temperature with the variation of the DC voltage, passing through inception voltage with the increased up to ±175 kV. The spatial distribution is denser when the temperature is high for the positive voltage and for the negative voltage.