多物理场耦合下不同短路与接地故障对变压器绕组状态影响的仿真研究  

Simulation Study on the Influence of Different Short Circuit and Ground Fault on Transformer Winding State Under the Coupling of Multiple Physical Fields

作　　者：王胜辉[1] 许育帅 孙凯旋 谢庆[1] 律方成[1] WANG Shenghui;XU Yushuai;SUN Kaixuan;XIE Qing;LÜFangcheng(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《高电压技术》2023年第6期2397-2407,共11页High Voltage Engineering

基　　金：国家重点研发计划(2018YFF01011903);河北省重点研发计划项目(19212109D)。

摘　　要：为研究不同短路与接地故障对变压器多次冲击后绕组状态的影响,基于变压器电、磁、热、力物理场理论,搭建了三相变压器的三维模型,考虑了温度对绕组材料属性的影响,采用迭代方法对电磁-热场进行了双向耦合仿真,然后将各故障类型下的电、磁和温度等物理量导入瞬态结构场,实现了绕组形变位移的仿真计算。结果表明,变压器内部的最大漏磁密对应故障为低压侧三相短路;绕组中部线饼服从整体磁密分布,其余部分线饼呈现一端大,另一端小的分布规律;绕组最高温度对应故障为低压侧三相短路,最高温度为97.36℃,位于A相低压绕组0°处;单次冲击下,位移最大对应故障为低压侧三相短路,其出现在高压绕组-20°~20°范围、高度1/3~2/3范围内;多次冲击后,绕组最大累积位移对应故障为低压侧两相接地,累积位移随冲击次数的增加而增加,直至趋于饱和。研究为变压器的多物理场耦合数值仿真提供参考。A three-dimensional simulation model of three-phase transformer is built based on the theory of electrical,magnetic,thermal and mechanical fields to study the influences of different short circuit and grounding faults on the winding state of transformer after multiple shocks.By considering the influence of temperature on the winding material properties,a bidirectional couple simulation of electromagnetic and thermal field is established.The electrical,magnetic,thermal and other physical quantities under each fault type are introduced into the transient structure field,and the winding deformation is calculated.The results show that when the three-phase short circuit on low-voltage side occurs,the flux leakage density inside the transformer reaches the maximum.The disc in the middle of the winding obeys the overall magnetic density distribution,and the rest of the disc is large at one side,while it is small at the other end.Furthermore,when the three-phase short circuit on low-voltage side occurs,the winding temperature reaches up to the highest,and the highest temperature is 97.36℃,which is located at 0°of phase A low-voltage winding.Moreover,when a single three-phase short circuit shock occurs at the low-voltage side,the displacement reaches the maximum,which occurs in the range of−20°to 20°and 1/3 to 2/3 height of the high-voltage winding.The maximum cumulative displacement of the winding reaches the maximum after multiple two-phase grounding shocks at the low-voltage side,and the cumulative displacement increases with the increase of the number of shocks until it tends to saturation.The research provides a reference for the multiple physical field coupling numerical simulation of transformer.

关 键 词：三相三绕组变压器 多物理场耦合 有限元法 累积效应 仿真分析 

分 类 号：TM41[电气工程—电器]