发电-电动机定子线棒启停过程中的热应力分析

发布时间：2018-05-24 12:36

本文选题：发电-电动机 + 冷却方式　；参考：《中国电机工程学报》2017年03期

【摘要】：发电-电动机频繁启停、变换运行工况的工作特性带来了电机内部频繁变化的温度与热应力,对电机的安全可靠性不利。电机的冷却方式与电机内部温度与热应力直接相关。该文采用理论分析与有限元仿真计算相结合的方法,分析了发电-电动机由停机冷态启动至额定运行的过程中,空冷与蒸发冷却两种冷却方案下电机定子线棒上的温度与热应力。为确保仿真结果的可信度,作者对国内某300MW发电-电动机运行数据进行了调研,并补充测定了真空压力浸渍绝缘的材料性能参数。研究结果表明,将蒸发冷却技术应用于发电-电动机中,可以有效降低电机负荷变化给电机定子线棒所带来的温度与热应力波动,有利于提高发电-电动机长期安全运行可靠性。
[Abstract]:The frequent start and stop of the generator and the change of operating conditions bring about frequent changes in temperature and thermal stress in the motor which is unfavorable to the safety and reliability of the motor. The cooling mode of the motor is directly related to the internal temperature and thermal stress of the motor. In this paper, the method of combining theoretical analysis with finite element simulation calculation is used to analyze the process of generating and motor starting from stop cold state to rated operation. Temperature and thermal stress on stator bar of motor under two cooling schemes: air cooling and evaporative cooling. In order to ensure the reliability of the simulation results, the author investigated the operation data of a 300MW generator motor in China, and also measured the material performance parameters of vacuum pressure impregnation insulation. The results show that evaporative cooling technology can effectively reduce the fluctuation of temperature and thermal stress caused by the change of motor load to the stator bar of the motor. It is propitious to improve the reliability of long-term safe operation of generator-motor.
【作者单位】：中国科学院电工研究所;
【分类号】：TV734

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