同步电机定子绕组匝间短路前后的温度及力学响应仿真分析

为了得到同步发电机定子绕组匝间短路前后的温度及力学响应特征,实现设备的早期维护,文章以一台凸极同步发电机为例搭建“场-路”耦合模型,分析了同步发电机定子匝间短路的电流、电压、损耗及绕组电磁力的分布规律,并将结果导入Workbench仿真平台,利用“电磁-热”、“电磁-结构”耦合方法求取了同步发电机故障前后的温度及力学响应(总体变形、等效应变与等效应力)变化特征。分析得到故障后电机定子绕组的温升已对附近槽绕组温度产生了影响,受力及易形变部位集中在定子端部绕组以及端部绕组与直线段连接的部分。文章为同步发电机的预防性绝缘制造以及定子绕组匝间短路故障检测和诊断技术提供了依据。

Simulation analysis of temperature and mechanical response of synchronous machine stator winding before and after inter turn short circuit

In order to obtain the temperature and mechanical response characteristics of the stator winding of synchronous generator before and after inter turn short circuit, and realize the early maintenance of the equipment, this paper takes a salient pole synchronous generator as an example to build a "field circuit" coupling model, analyzes the distribution laws of the current, voltage, loss and winding electromagnetic force of the stator inter turn short circuit of synchronous generator, and imports the results into the workbench simulation platform, using "electromagnetic heat" The variation characteristics of temperature and mechanical response (total deformation, equivalent strain and equivalent stress) of synchronous generator before and after fault are obtained by "electromagnetic structure" coupling method. The analysis shows that the temperature rise of the machine stator winding after the fault has affected the temperature of the nearby slot winding, and the stress and deformation parts are concentrated in the stator end winding and the part where the end winding is connected with the straight section. This paper provides a basis for preventive insulation manufacturing of synchronous generator and detection and diagnosis technology of stator winding inter turn short circuit fault.