Simulation calculation of temperature field of dc resistance divider based on CFD method

Under many working conditions, the high-voltage DC resistance divider has obvious self-heating effect. The temperature rise in the voltage divider will cause the resistance of the voltage divider to change and affect the measurement accuracy. In this paper, the hydrodynamic method (CFD) is used to calculate the temperature field of the voltage divider under various working conditions and insulation materials. Through calculation it is found that the internal temperature field of the voltage divider will gradually increase as the operating power and ambient temperature increase. Finally, the temperature field of the voltage divider using forced air-cooling method is calculated and compared. It is found that the external temperature of the voltage divider can be effectively reduced by using external air-cooling equipment. As the wind speed of the air-cooled equipment increases, the internal temperature of the voltage divider will be smaller, so that the external air-cooling equipment can effectively improve the measurement accuracy of the resistor divider.