Characterization of PD of suspended water droplets in flowing transformer oils

Suspended water droplets is currently an oil-immersed transformer internal insulation discharge, breakdown of an important reason, this paper builds a simulation of the transformer test platform, the test by changing the flow rate of 0~1.8m³/h, the temperature of 40~70°C each of the four variables to study the law of change of the oil suspended droplets of partial discharge (PD), according to the skewness, the steepness, the number of peaks and the localization of the maximum discharge with the flow rate, temperature changes to determine the coupling relationship of PD. The coupling relationship of PD is judged according to the change of skewness, steepness, number of local peaks and maximum discharge with the change of flow rate and temperature. The test results show that the larger the flow rate is at constant temperature, the more unstable the PD of suspended water droplets is, and the overall trend of discharge is decreasing; when the flow rate is constant, the water droplets are mostly in the dissolved state at 50°C, and the electrical discharge decreases, and the thermal movement of molecules increases at 60,70°C, and the electrical discharge increases, and the number of the phase points of the electrical discharge shows a decreasing and then an increasing trend.