Abstract：The oil-paper insulation as the main insulating medium of the converter transformer, its distribution of electric field is influenced by applied voltage and space charge. The traditional numerical methods fail to figure up the influence of space charge accurately. In this paper, a method based on Schottky emission theory and transient upstream finite element method (TUFEM) was proposed to solve the carrier transport equations. The simulation of charge motion characteristics in single oil-paper insulation was carried out considering electrode implantation barrier, carrier mobility, trap coefficient and carrier recombination coefficient. Compared with the test results, the simulation results indicate this method has high accuracy. The effects of temperature gradient on the electric field intensity distortion in oil-paper insulation were studied. Moreover, the charge movement and electric distribution at different time moments under the polarity reversal voltage were calculated. This method can be applied to the calculation and optimization design of the insulation electric field in the high voltage DC converter transformer.
连启祥, 杜志叶, 杨知非, 金硕, 阮江军. 油纸绝缘内部合成电场数值模拟方法[J]. 电工技术学报, 2017, 32(20): 53-61.
Lian Qixiang, Du Zhiye, Yang Zhifei, Jin Shuo, Ruan Jiangjun. Numerical Simulation Method of Electric Field in Oil-Paper Insulation. Transactions of China Electrotechnical Society, 2017, 32(20): 53-61.
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