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Electric field distribution of converter transformer barrier system using nano modified pressboard
Pages: 29-34
Year: Issue:  1
Journal: Electric Machines and Control

Keyword:  converter transformerbarrier systemelectric field distributionnanometer SiCnonlinearity;
Abstract: In order to solve the problem of electric field distribution concentration in converter transformer barrier system under DC and polarity reversal voltages, the method of modification to pressboard with non-linear nano SiC was explored, and the nano SiC modified pressboard samples were manufactured, the die-lectric properties of modified pressboard was measured. The electric field distribution simulation model of converter transformer barrier system was built considering its practical structure, and the homogenization effect of pressboard modification on barrier system electric field distribution was analyzed. The experiment results show that the permittivity of modified pressboard increases with the increase of nano SiC doping ra-tio but not obviously and there is a slight rising trend with the electric field strength increasing. The con-ductivity of modified pressboard increases with the increase of nano SiC doping ratio, and it shows obvious nonlinearity between conductivity and electric field strength when the doping ratio exceeds a certain val-ue. The simulation results show that the electric field strength in pressboard can be reduced by using nano modified pressboard, and electric field strength in oil will be heightened, which can make the elec-tric field distribution in oil/pressboard insulation structure more homogeneous under DC and polarity re-versal voltages.
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