Design and Analysis for Stator Cooling Structure of Air-Cooled Hydrogenerator

被引：2
|
作者：
He J. [1 ]
Bian X. [1 ]
Liang Y. [1 ]
机构：
[1] School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2019年 / 53卷 / 12期
关键词：
Air-cooled hydrogenerator; Cooling structure; Fluid field; Temperature field; Transposition winding;
D O I：
10.7652/xjtuxb201912015
中图分类号：
学科分类号：
摘要：
To improve the ventilation cooling effect of air-cooled hydrogenerators, the design and performance analysis methods of the stator cooling structure are investigated. Taking a 250 MW air-cooled hydrogenerator for example, the factors of stator winding transposition, channel steel, slot wedge shape and the interaction among ventilation ditches are considered to construct the physical model and mathematical model of stator fluid-solid coupling, and the loss of each strand is numerically evaluated. According to fluid heat transfer theory and temperature rise characteristics of the air-cooled hydrogenerator stator, three design strategies are proposed by changing the structural dimensions of the stator cores and the ventilation grooves in the generator. Comparing the fluid and temperature fields in the solution region for different structures, the optimal cooling structure of the generator stator is obtained. The accuracy of the model and the feasibility of the method are experimentally verified. It is shown that the axial length of the core segments exerts a greater influence on the temperature rise of the windings in the stator slot than the axial length of the ventilation grooves does; the highest temperature of the transposition winding in the slot can be effectively reduced by adjusting the number and axial length of stator ventilation grooves and core sections reasonably. © 2019, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
引用
收藏
页码：111 / 119
页数：8
相关论文
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