基于场路耦合的电力变压器不同运行方式下漏磁场的仿真研究  

Power Transformer Based on Field-circuit Coupling in Different Operating Modes Simulation Research on Leakage Magnetic Field

作　　者：王康 曾静岚 郑宇 兰生[2] 杜国安 林野 WANG Kang;ZENG Jing-lan;ZHENG Yu;LAN Sheng;DU Guo-an;LIN Ye(China State Grid Fujian Electric Power Research Institute,Fuzhou 350108,China;College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建省电力科学研究院,福州350007 [2]福州大学电气学院,福州350108

出　　处：《哈尔滨理工大学学报》2021年第4期28-37,共10页Journal of Harbin University of Science and Technology

基　　金：国家电网福建电力有限公司科技项目(52130417000S);国家自然科学基金(51977112).

摘　　要：针对变压器运行方式改变,变压器在短路电流的冲击作用下,绕组的磁场分布特性存在差异的问题。本文采用了场路耦合的有限元仿真方法,以1台SSZ11-50000/110三相三绕组电力变压器为研究对象,建立了变压器仿真模型,根据建立的变压器的三维模型,考虑变压器在高-中运行方式下,中压侧绕组出现三相短路故障时,计算出了绕组最大分接、额定分接、最小分接3种情况下瞬态漏磁场,分析了3种不同分接情况下绕组不同位置的轴向、辐向的最大磁感应强度分布规律。仿真结果表明,绕组在短路过程中漏磁场的分布情况与运行状态、时间和空间有关。当t=0.01 s,随着短路电流出现最大值,绕组轴向和辐向的瞬态漏磁场数值均为最大,绕组轴向内侧、外侧、中间外侧和辐向顶端和底端漏磁场分布规律差异明显。同时,3种不同分接类型的切换,对高压绕组的磁感应强度畸变影响较大,对中压绕组的磁感应强度畸变影响较小。上述计算结果,可为设计变压器绕组结构提供理论参考。In view of the change in the operation mode of the transformer,under the impact of the short-circuit current of the transformer,the magnetic field distribution characteristics of the windings are different.In this paper,a field-circuit coupling finite element simulation method is adopted.Taking a SSZ11-50000/110 three-phase three-winding power transformer as the research object,a simulation model of the transformer is established.In operation mode,when a three-phase short-circuit fault occurs in the medium voltage side winding,the transient magnetic field leakage under the three conditions of maximum tap,rated tap and minimum tap of the winding is calculated,and the different windings under three different tap situations are analyzed.The distribution law of the maximum magnetic induction intensity in the axial and radial directions of the location.The simulation results show that the distribution of the leakage magnetic field of the winding in the short-circuit process is related to the operating state,time and space.When t=0.01 s,as the short-circuit current reaches the maximum value,the values of the transient magnetic field leakage in the axial and radial directions of the winding are both maximum,and the distribution law of the leakage magnetic field in the inner,outer,middle outer and radial directions of the winding axis The difference is obvious.At the same time,the switching of the three different tapping types has a greater impact on the distortion of the magnetic induction intensity of the high-voltage winding,and less influence on the distortion of the magnetic induction intensity of the medium-voltage winding.The above calculation results provide a theoretical reference for the design of transformer winding structure.

关 键 词：变压器 场路耦合 瞬态磁场 三相短路 有限元仿真 

分 类 号：TM41[电气工程—电器]