汽轮发电机定子冷却水路堵塞时的温度场分析与计算

ANALYSIS AND CALCULATION OF TURBOGENERATORS STATOR TEMPERATURE FIELD ON COOLING CIRCUIT BLOCKED

水氢氢汽轮发电机定子冷却水系统发生堵塞的事故时有发生,对定子温度进行监测是诊断冷却系统故障的重要手段之一,因此掌握冷却系统的故障状态和电机中温度分布的对应规律是非常必要的。为此,根据流体力学和传热学的基本原理,结合水氢氢汽轮发电机的结构特点,提出了汽轮发电机定子线棒冷却水路发生堵塞时定子温度场的数学模型。采用热平衡方程对定子温度场的偏微分方程进行离散化处理,与冷却系统中水温及氢温的计算相耦合,形成联立方程组。在此基础上研究了定子线棒冷却水路发生堵塞时对发电机定子温度场的影响,分析总结了空心股线堵塞的严重程度与定子线棒出水口温度以及定子槽检温计温度之间的变化规律,为发电机发生水路堵塞时的故障诊断提供了理论依据。

The stator temperature monitoring is one of important means that diagnose fault of stator cooling system in turbogenerators, so it is necessary that hold the relationship between fault of cooling system and temperature field. Thus, on the basis of the fluid mechanics and heat transfer theory and the structure of water-hydrogen- hydrogen turbogenerators, the paper puts forward the stator temperature field model about stator cooling-water circuit blocked. The partial differential equations of stator temperature field model are dispersed with thermal equilibrium equation and are coupled with the temperature equations of water or hydrogen of cooling system. The temperature field is researched when hollow strands are blocked. The relationship between cooling water and stator bar temperature and the number of blocked strands is analyzed and summarized. It provides the theory support for the fault diagnosis of the cooling system blocked in turbogenerators.