24KV蒸发冷却汽轮发电机定子绝缘结构的可行性研究

国产大型汽轮发电机，很难做到24kV电压等级。电压高，定子绕组槽内电场分布的改善及耐电晕等技术处理难度大。该文采用理论计算与模型实验两方面的仿真手段，详尽地分析了蒸发冷却方式下形成的气、液、固三态绝缘体系的耐电晕、耐击穿的可靠性，提出一种适合于该冷却方式的、应用于高电压等级的新型定子绝缘结构，系统地研究了结构的绝缘特点及规律，并得出这一新型绝缘体系对24kV电压等级是可行的结论。

FEASIBLE RESEARCH ON STATOR INSULATION STRUCTURE OF 24kV RATED EVAPORATIVE COOLING GENERATOR

It is very difficult for 24kV rated voltage large turbo-generator to be manufactured in China. Because under high voltage, the technology to improve electric field distribution of stator coil in slot and to against corona in slot is hard to finish. By calculative and experimental simulation, this paper analyzed in detail the three-state insulative system consisted of gas, liquid, and solid formed by evaporative cooling mode, including the reliability of its anti-corona and anti-breakdown . This paper offers a new kind of stator insulation structure that is suitable to evaporative cooling mode and can be applied to high voltage level. After a series of researches on insulative characters and laws of the new structure, a conclusion that the new insulative system is feasible to 24kV rated voltage is arrived.