灯泡贯流式水轮发电机转子温度场的有限元计算

Calculation of 3-D temperature field of rotor for bulb-type hydropower unit based on finite element analysis

根据传热学原理建立了5 500 kW/6 471 kV.A灯泡贯流式发电机转子三维温度场的数学模型,给出了求解的基本假设和相应边界条件,以水轮发电机的半个磁极为计算区域得到了发电机转子的温度场。计算结果表明:转子温度最高点出现在冷却气流出口的绝缘层和铜绕组的中心剖面上,温度值90.008℃,与实测结果基本相符。计算结果不仅可为机组设计提供指导,而且为机组运行的温度监控提供了参考。

Based on the heat transfer principle, a mathematic model of 3-D temperature field for the rotor of 5 500 kW and 6 471 kV·A bulb-type hydropower unit is established; from which the basic assumptions and the corresponding boundary conditions for the solution are given and then the temperature field of the rotor is obtained by taking the half of the pole shoe as the calculation region. The result shows that the peak temperature point of rotor appears at the central section of the insulated layer and the copper winding of the cooling vent with the value of 90. 008℃, which basically coincides with the measured value. In conclusion, the result can not only provides a guide to the design of the generating unit, but also can give a reference to the temperature monitoring on the operation of the generating unit.