定子匝间短路位置对汽轮发电机转子铁心温升特性的影响  

Impact of stator interturn short circuit position on rotor core temperature rising characteristics in turbo-generators

作　　者：何玉灵[1] 张文[1] 王烁 武钰[1] 王晓龙[1] HE Yu-ling;ZHANG Wen;WANG Shuo;WU Yu;WANG Xiao-long(Department of Mechanical Engineering and Hebei Key Laboratory of Electric Machinery Equipment Maintenance and Failure Prevention,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学机械工程系暨河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003

出　　处：《电机与控制学报》2022年第10期12-22,共11页Electric Machines and Control

基　　金：国家自然科学基金(51777074);河北省自然科学基金(E2020502032);中央高校科研业务费专项基金(2020MS114,2018YQ03);河北省第三批青年拔尖人才支持计划([2018]-27)。

摘　　要：气隙静偏心广泛存在于发电机中,导致发电机气隙分布不均,当处于不同气隙长度中时,定子匝间短路表现出位置特性。本文分析汽轮发电机不同定子匝间短路位置下转子铁心的温升特性,首先推导发电机不同定子匝间短路位置下的磁通密度和铁心损耗的解析表达式;然后建立发电机三维电磁场与温度场仿真计算模型,对不同短路位置下的铁心损耗和温度进行求解计算;最后实测CS-5型故障模拟发电机在不同定子匝间短路位置下的转子铁心温度,实验结果与理论分析和仿真计算相一致。研究表明:定子匝间短路会显著增加转子铁心损耗与温度;特别地,随着短路位置越接近气隙最小位置处,转子铁心的温升越高。Static air-gap eccentricity(SAGE)is widely present in generators,resulting in uneven air-gap distribution of generators.The stator interturn short circuit(SISC)exhibits positional characteristics in different air-gap lengths.In this paper,the rotor core temperature rising characteristics were analyzed under different SISC positions in turbo-generators.Firstly,the theoretical formulas of the magnetic flux density at different positions were deduced to obtain the detailed core loss expressions.Then the 3D finite element model was set up to calculate the core loss and the temperature of the rotor core.Finally,the experimental verification was carried out on the CS-5 prototype generator.The test temperature results well accord with the theoretical analysis and the finite element simulation data.It is indicated that the rotor core loss as well as the temperature increases significantly under SISC fault.Particularly,the closer the short circuit position is to the minimum air-gap point,the more the rotor core temperature will be increased.

关 键 词：汽轮发电机 定子匝间短路位置 气隙静偏心 转子铁心 温升特性 

分 类 号：TM31[电气工程—电机]