Optimization of Transformer Bushing Based on Partial Discharge
With the increase of voltage level,oil-paper capacitor casing faults are becoming more and more common,of which partial discharge is the main cause of faults.In order to ensure the stability and safe operation of the power grid,it is necessary to control the partial discharge of the casing.To this end,the study constructs an oil-paper capacitor-type casing structure,and uses numerical simulation tools to conduct electro-thermal joint simulation of 126 kV casing,with the goal of understanding the effect of operating conditions on the main isolation material's tiny electrical discharge.The results show that the heat of the main isolation material shows an increasing and then decreasing trend in the axial direction,with a continuous decrease in the radial direction,with a maximum temperature of 89°C and a minimum temperature of 72°C occurring at the zero screen position.In summary,this study improves the trigger voltage of the micro-discharge of the main isolation material,which is of significant practical significance in understanding and improving the oil-paper capacitive casing in enhancing the stability and safety of the power grid.
primary isolationtransformeroil-paper capacitive bushingfinite element analysis
NETL
NSTL
万方数据
