摘要
变压器不平衡问题是目前配电变压器存在的普遍问题,不平衡运行导致变压器磁场偏移,绕组偏心受力及振动问题加剧,因此研究变压器不平衡运行状态下绕组振动问题具有重要意义.文中针对变压器三相不平衡运行所造成的绕组受力振动问题,研究变压器在不平衡时的电磁参数及绕组振动特性的变化情况.通过电磁-机械耦合求解绕组振动加速度,在此基础上构建变压器三相不平衡仿真模型.仿真分析不同不平衡度下端口电流、磁密分布以及受力振动,研究变压器电磁参数与绕组振动特性的变化及其对应关系.搭建动模实验平台,测量在不同条件下绕组电流及振动加速度,并与仿真结果进行对比,验证所得结论的正确性.
Transformer unbalance is a common problem in distribution transformers at present.Unbalanced operation results in magnetic field offset of transformers,and the problems of eccentric force on windings and vibration are aggravated.Therefore,it is important to study winding vibration in unbalanced operation of transformers.In this paper,according to the force-induced vibration of windings caused by three-phase unbalanced operation of transformer,the changes of electromagnetic parameters and vibration characteristics of windings in unbalanced transformer are studied.Vibration acceleration of winding is solved by electromagnetic-mechanical coupling,and three-phase unbalance simulation model of transformer is built on this basis.The port current,magnetic density distribution and forced vibration under different unbalance are simulated and analyzed.The changes of transformer electromagnetic parameters and winding vibration characteristics and their corresponding relationships are studied.A dynamic model test platform is built to measure the winding current and vibration acceleration under different conditions,and the results are compared with the simulation results to verify the correctness of the conclusions.
作者
潘超
杨如月
陈祥
Pan Chao;Yang Ruyue;Chen Xiang(Key Laboratory of Modern Power System Simulation Control and Green Power New Technology Ministry of Education(Northeast Electric Power University),Jilin Jilin 132012)
出处
《东北电力大学学报》
2020年第6期52-60,共9页
Journal of Northeast Electric Power University
基金
吉林省科技发展计划项目(20190303007SF)
国家自然科学基金项目(51507027).
关键词
变压器
三相不平衡
绕组振动
Transformer
Three-phase unbalance
Winding vibration
