LI Dong-xue, LI Yan, LI Xiao-hui. Finite Element Calculation of Anisotropic DC Electric Field in Converter Transformer[J]. High voltageapparatus, 2012, 48(6): 18-22.
LI Dong-xue, LI Yan, LI Xiao-hui. Finite Element Calculation of Anisotropic DC Electric Field in Converter Transformer[J]. High voltageapparatus, 2012, 48(6): 18-22. DOI: 10.13296/j.1001-1609.hva.2012.06.005.
Finite Element Calculation of Anisotropic DC Electric Field in Converter Transformer
Taking the commonly used oil-paper insulation structure for example
DC electric field at valve side of a converter transformer is calculated with the self-coded program.The programming method is verified by simulation via the finite element software ANSYS.Based on the anisotropic characteristic of conductivity of paperboard material
a mathematical model of DC electric field in the condition of anisotropic conductivity is derived
the discrete format is given
and the effect of conductivity on DC electric field is analyzed.A 500 kV converter transformer is calculated
and the results show that
by considering the anisotropy of the material
the electric field strength increases in oil and decreases in paperboard
and the magnitude of the field strength variation depends on initial value of conductivity.