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Main insulation electric field of a 220 kV oil-immersed power transformer is calculated. First of all, the main insulation structure is divided into three regions and the corresponding simplified model is established using a two-dimensional axisymmetric calculation field; then typical paths and locations are selected and its field strength and the corresponding insulation margin are mainly examined; finally, the position of the maximum electric field strength and the path of the maximum average electric field strength are obtained by comparing and analyzing the distribution of potential and electric field intensity in different regions, and corresponding insulation margin is calculated which provides an effective method of engineering analysis for reasonable and economical design of the structure of main insulation.

Analysis of Main Insulation Electric Field of SFPSZ9-150000/220 Power Transformer