Analysis of the influence of configuration parameters on the electric field distribution of the main insulation structure of valve-side winding of converter transformer considering electro-thermal coupling

Abstract

The variation of configuration parameters in the insulation structure of transformers significantly impacts the distribution of electric fields. Current research on electric field distribution calculations often overlooks the influence of electric field intensity and temperature on this distribution. However, considering that the direct current conductivity of oil-paper materials is easily affected by both electric field intensity and temperature, any changes in their conductivity will inevitably affect the electric field distribution. Therefore, this paper incorporates the influence of electric field intensity and temperature on the calculation process of the electric field distribution in the main insulation structure of the valve-side winding. Additionally, it calculates the distribution of multi-fields for a wide range of structural configuration parameters. Consequently, the influence law of insulation structure configuration parameters on the electric field distribution of the main insulation structure of valve-side winding for converter transformer when considering electro-thermal coupling is obtained. This finding can serve as a crucial reference for designing and optimising converter transformers.