Improvement of the Three-Dimensional Surface Charge Simulation Method
Zhao Zhongyuan¹,Qiu Yuchang¹,Fang Zhi¹,Wang Jiansheng²,Feng Jianqiang²
(1.School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China;2.Xi'an High Voltage Apparatus Research Institute)

Abstract:A three-dimensional surface charge simulation method is improved for effective computation of stray capacitance of electric apparatus. In this method, each curved surface on which electric charges are distributed is divided into a number of curved surface elementsinstead of planar elements. The surface shape of each element is approximated by using a quadratic formula. The use of many curved surface elements provides a good approximation of the power equipment. As an example, the capacitance of a shielding ring against ground is calculated using this method. The computed capacitancevalues agree well with the measured data with relative error up to two percent.
Keywords: surface charge simulation method;curved-surface triangular element;stray capacitance