Abstract
Converter transformers are key facilities in HVDC power systems. Electric field distribution in the converter transformers is more complex and severe than traditional transformers. Therefore, electric field distribution analysis and estimation is crucial in the converter transformer design and manufacturing. Finite element simulation is an efficient and economical way to do such electric filed calculation. To date, a number of 2D electrical field simulations have been done to analyze electric field in transformer. However, most of those 2D models are only given by parts of the transformer inner structure with limited analysis and description of the electric field distribution in transformer. In this paper, a 3D converter transformer model of a real size system with line winding, valve winding and iron core is modeled. Then material parameters and properties such as conductivity and relative dielectric constant of insulation oil and insulation pressboard under different temperature are measured. In this simulation, DC and AC voltage is applied on valve winding and other windings are set to ground to calculate electric field density. In this way, both the electric field strength in pressboard and oil duct of model under AC or DC voltage are analyzed as well as the polarity of electric field.
Published Version
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