Study on the Distribution Characteristics and its Flow State of Insulating Gas around Heating Conductors Rated for High Current

The insulating gas around heating conductor with high current flows continuously, the density of the insulating gas is not uniformly distributed, and there is a lack of relevant experimental measurements at present. In this paper, we analyze the inhomogeneity of gas density distribution around the heating conductors when different high currents are passed in the air by schlieren technique, and calculate the velocity of gas by optical flow method, so as to determine its flow pattern. The experimental results show that: there are obvious differences in the density distribution of the insulating gas in different regions around the conductor, and the closer to the upper surface region of the conductor, the greater the difference; with the increase of the current gas flow rate increases, the gas density inhomogeneity increases; for the experimental samples mentioned in this paper, the maximum flow velocity of the insulating gas is about 0.45m/s when the conductor steady state temperature rise is 64K, the maximum Reynolds number is about 2475, the gas does not develop into turbulence. The maximum velocity values and maximum Reynolds number at different steady state currents (Tr) were analysed comparatively and some patterns were obtained. This experimental and analytical methods can provide a reference for the study of the gas distribution characteristics and flow state around the heating conductor inside the enclosed gas-insulated electrical equipment.