CAJ | 학술논문

基于电荷一电位有限元法分析换流变压器的油纸绝缘结构极性反转电场，该方法可以直接得到节点电位和节点电荷。对各个时刻节点电荷进行处理，提出得到电荷密度的方法。通过提取一类边界上的节点面电荷密度，可以准确地计算出第一类边界上的法向电场强度，从而可以更好地指导绝缘强度设计。通过一个有解析解的双层有损同轴绝缘结构模型，验证了方法的有效性。最后，分析了一个换流变压器阀侧绕组典型绝缘结构的极性反转电场变化过程。
기우전하일전위유한원법분석환류변압기적유지절연결구겁성반전전장，해방법가이직접득도절점전위화절점전하。대각개시각절점전하진행처리，제출득도전하밀도적방법。통과제취일류변계상적절점면전하밀도，가이준학지계산출제일류변계상적법향전장강도，종이가이경호지지도절연강도설계。통과일개유해석해적쌍층유손동축절연결구모형，험증료방법적유효성。최후，분석료일개환류변압기벌측요조전형절연결구적겁성반전전장변화과정。
The polarity reversal （PR） electric field of oil-paper insulation structure was computed by the charge- electric potential finite element method, in which the node charges and electric potentials can be directly obtained. The node charges at every instant could be converted to node charge densities by a numerical method proposed. The normal electric field intensity can be accurately got from the electric charge density of the Dirichlet boundary, which may be helpful to the insulation design. The proposed method was verified by a simple model, which has analytical solutions, and used to analyze the PR process of a typical oil-paper insulation structure of converter transformer.