突发短路条件下变压器绕组振动特性的仿真研究

发布时间：2018-04-01 04:14

本文选题：变压器　切入点：短路冲击　出处：《西安交通大学学报》2017年10期

【摘要】：为了研究小容量电源条件下变压器绕组在短路冲击下的振动特性,建立了基于冲击电流发生器的变压器短路冲击振动试验平台,根据一台单相10/0.4kV变压器的结构参数,利用场-路耦合的有限元算法,获得了短路冲击下变压器绕组的电流变化规律,并与试验结果进行对比,验证了仿真方法的正确性。在此基础上,提取高低压绕组端部、中部线饼轴向电磁力的变化规律,利用瞬态动力学获得了高压绕组不同线饼在冲击电流下的振动响应。研究结果表明:三维有限元模型的场-路耦合算法可以准确地获得试验平台的电流特性;短路冲击下绕组轴向振动最大加速度位于绕组高度的1/4和3/4位置处,可以在油箱表面正对该位置的区域进行振动监测;绕组同一线饼中垫块间线匝振动加速度大于垫块所在位置的振动加速度;由于惯性,绕组轴向振动加速度最大值的时刻滞后于电流幅值最大的时刻。
[Abstract]:In order to study the vibration characteristics of transformer windings under short circuit impact under the condition of small capacity power supply, a transformer short circuit shock vibration test platform based on impulse current generator was established. According to the structural parameters of a single phase 10/0.4kV transformer,By using the field-circuit coupling finite element method, the current variation law of transformer windings under short circuit impact is obtained, and the correctness of the simulation method is verified by comparing with the experimental results.On this basis, the variation law of axial electromagnetic force at the end of the high and low voltage winding and the central wiper is extracted, and the vibration response of the high voltage winding under the shock current is obtained by using transient dynamics.The results show that the field-circuit coupling algorithm of 3D finite element model can accurately obtain the current characteristics of the test platform, and the maximum acceleration of the axial vibration of the winding under short-circuit impact is located at the position of 1 / 4 and 3 / 4 of the height of the winding.Vibration monitoring can be carried out on the surface of the tank; the vibration acceleration between the gaskets in the winding and the cake is greater than the vibration acceleration at the position where the gasket is located; because of inertia, the vibration acceleration between the gaskets is larger than the vibration acceleration in the position of the gasket.The moment of maximum axial vibration acceleration of winding lags behind the moment of maximum current amplitude.
【作者单位】：广东电网有限责任公司电力科学研究院;
【基金】：国家“863计划”资助项目(2014AA032705) 南方电网科技专项资助项目(GDKJQQ20153006)
【分类号】：TM41

【相似文献】