1000MW级汽轮发电机转子端部线圈温升的分析计算

Analysis and Computation of the Rotor End Turn Coils Ventilation and Temperatures of 1000MW Inner cooled Turbogenerator

本文探索了一种适用于工程计算的温升计算方法，它避免了用有限元法计算时因种种假定所带来的误差。提供了分析1000MW级水氢氢汽轮发电机转子端部线圈各段的压力损失和节点单元猛升的分析计算方法。考虑到电机绕组的对称性，将二分之一极绕组分成mxn个温度计算单元，建立了准三维热模型，给出了绕组节点单元热等效网络和任一节点单元导体的热平衡方程，用数值法计算了一台930MW4极水氢氢汽轮发电机，将计算值与试验结果进行比较，表明计算的有效性。散热系数的难以准确确定会给温升计算带来较大误差，本文将绕组分成mxn个单元，从每一单元节点的风压和流量出发，从而提高了计算的精确性。也为通过调节导体风追、进风口和出风口的数量、尺寸及形状，从而获得风路中较佳的流量分布，使各线圈导体的温升更加均匀，提供了合适的计算方法。

A method to analyze and calculate the Pressure losses and coolant and copper temperatLires oftLhe inner cooled rotor end tum coils of a 1000MW turbogenerator has been provided. The ventilation andtemperatures of each turn of every coil for one half of one pole at one end are studied, assuning ymmetry for the other pole half and the remaining poles. A three fornsional thermal whel which seParates mtums into m x n nodes is given. The results of computation of a 930MW turbogenerator are consistent withthe test. The appropriate readjustment of the numbers and sizes and shapes can improve the distribution ofthe volume flow and temperature of end turn coils.