CAJ | 학술논문

冲击电压作用下变压器线圈应力过大是变压器损坏的主要原因。以一台带铁芯的电力变压器（110/10.5 kV,31500 kVA）为例，对其在雷电冲击过电压作用时的漏磁场和线圈应力等问题进行计算和分析。采用有限元法，使用ANSYS软件进行仿真计算，分别对低压绕组和高压绕组的内侧、中部和外侧与调压绕组的内侧和外侧所受的轴向力、径向力、合力进行计算，得到轴向力、径向力和合力的分布以及对于同一绕组其不同部位的受力情况。从而得出了低压绕组的绝缘裕度要大于高压绕组和调压绕组，高压绕组和调压绕组的线圈应力更有威胁性，绕组更容易受到损坏，应尽可能加强线圈的机械强度并随时检测线圈的损坏情况的结论，并对这一问题未来发展的趋势做出了一些推测。
충격전압작용하변압기선권응력과대시변압기손배적주요원인。이일태대철심적전력변압기（110/10.5 kV,31500 kVA）위례，대기재뇌전충격과전압작용시적루자장화선권응력등문제진행계산화분석。채용유한원법，사용ANSYS연건진행방진계산，분별대저압요조화고압요조적내측、중부화외측여조압요조적내측화외측소수적축향력、경향력、합력진행계산，득도축향력、경향력화합력적분포이급대우동일요조기불동부위적수력정황。종이득출료저압요조적절연유도요대우고압요조화조압요조，고압요조화조압요조적선권응력경유위협성，요조경용역수도손배，응진가능가강선권적궤계강도병수시검측선권적손배정황적결론，병대저일문제미래발전적추세주출료일사추측。
The excessive power transformer coil stress caused by impulse voltage is the main reason for transformer damage. Taking a core power transformer (110/10.5kV, 31500kVA) as an example, to calculate and analyze the leak-age magnetic field and the coil stress when the transformer bears the lightning overvoltage.The distributions of axial, radial and resultant forces as well as the forces on different parts of a winding are obtained based on calculating the axial, radial and resultant forces on inner side, middle part and outside of low and high voltage windings and on inner side and outside of regulating winding by using of finite element method and ANSYS software. So we know the insula-tion margin of low voltage winding is higher than that of high voltage winding and regulating winding. Therefore, the high voltage and regulating winding coils must be inspected at any time and their mechanical strengths must be im-proved also because they are more easily damaged than the low voltage one. Finally, the development tendency is of-fered.