论文部分内容阅读
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。
Power generation - frequent motor start and stop, change the operating conditions of the working characteristics of the frequent changes in the internal motor brought thermal and thermal stress, the safety and reliability of the motor. Motor cooling and internal motor temperature and thermal stress directly related. In this paper, the method of theoretical analysis combined with the finite element simulation is used to analyze the relationship between the temperature and the heat on the stator bars of the motor under the two cooling schemes of air-cooled and evaporative cooling in the process that the generator-motor starts from stopped cold to the rated operation stress. In order to ensure the credibility of the simulation results, the author conducted a survey on the operation data of a 300MW generator-motor in China and supplemented the determination of the material performance parameters of the vacuum pressure impregnation insulation. The results show that the application of evaporative cooling technology to generator-motor can effectively reduce the temperature and thermal stress fluctuations brought by the change of motor load to the stator bar of the motor, which is beneficial to improve the long-term safe operation reliability of generator-motor.