冷却方式对抽水蓄能机组定子绝缘特性的影响

发布时间：2018-04-13 22:39

本文选题：抽水蓄能机组 + 发电电动机　；参考：《电工技术学报》2017年14期

【摘要】：抽水蓄能机组中,发电-电动机具有频繁起停、负荷变化剧烈的特点。近年来其大容量、高水头发展进程使电机频繁负荷变化所产生的热应力对电机安全可靠性的影响越来越不可忽视。热应力不仅与热负荷变化速率、电机结构特征有关,还与发电-电动机的冷却方式直接相关。首先对几种冷却方式应用于发电-电动机中的优缺点进行定性分析,继而提出以对比分析冷却方式对主绝缘冷热循环老化影响为目的的冷热循环实验设计原则,最后通过冷热循环老化实验的形式、以最大局部放电量为绝缘性能的表征参数,定量研究冷却方式对抽水蓄能机组中定子绝缘特性的影响。结果表明,采用蒸发冷却技术的定子线棒抗冷热循环老化性能要明显优于采用通风冷却的定子线棒。
[Abstract]:In pumped storage unit, generator-motor has the characteristics of frequent start and stop and severe load change.In recent years, the influence of thermal stress caused by frequent load variation on the safety and reliability of motor is becoming more and more important due to its large capacity and high water head development process.The thermal stress is not only related to the rate of change of thermal load and the structure of motor, but also to the cooling mode of generation-motor.Firstly, the advantages and disadvantages of several cooling methods used in generation-motor are qualitatively analyzed, and then the experimental design principle of cooling cycle is put forward, which aims at comparing the effect of cooling mode on the aging of main insulation cooling cycle.Finally, the influence of cooling mode on stator insulation characteristics of pumped storage unit is quantitatively studied by the form of cooling and heat cycling aging experiment, taking the maximum partial discharge as the characterization parameter of insulation performance.The results show that the stator bar with evaporative cooling technology is superior to the stator bar with ventilation cooling.
【作者单位】：中国科学院电工研究所;
【分类号】：TV734;TV743

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