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A state space finite element method is presented for the calculation of transient electric field in oil-immersed insulation system of converter transformer. Firstly, the state equation is derived based on the quasi-static electric field theory, combined with the given boundary value using the penalty method, which has a clear physical meaning. Secondly, the state equation is solved in a fine integration...
An adaptive time-step algorithm has been proposed in this paper based on each step's temporal local truncation error of C-N (Crank-Nicholson) method. Utilizing the characteristics of polarity reversal voltage, the oscillation of time step at the discontinuity of the derivative of polarity reversal voltage has been avoided successfully by the combination of backward Euler method. The algorithm is verified...
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