摘要
为了解决高速旋转的转子容易产生多类故障问题,本文对发电机转子典型故障的温度场进行分析,评估故障影响和机组带病运行能力。采用有限元方法建立了TA-1100-78型四极汽轮发电机的三维传热模型,计算并分析了转子不同程度、不同位置励磁绕组匝间短路以及转子风路堵塞时的转子三维温度场。结果表明:转子匝间短路和风路堵塞均会引起转子温度场分布的不平衡。匝间短路程度越高,转子温度场不平衡度越大,温升越大;匝间短路位置越靠近转子大齿,转子温度场畸变程度越高。风孔堵塞对转子温度场影响与堵塞位置有关,单排风孔堵塞引起堵塞点附近区域温升明显,双排风孔堵塞对整体温度场影响不大。转子典型故障三维温度场分析为发电机的设计、运行和维护提供了理论参考。
At present, the four-pole turbo-generator of ten million megawatts class is widely used in nuclear power plants. Given that the high-speed rotating rotors are prone to many kinds of faults, analyzing the temperature field of the typical faults of generator rotors is helpful in evaluating the influence of faults and the operation ability of the unit with faults. A 3D heat transfer model for the TA-1100-78-type, four-pole turbo-generator was built by using the finite element method. The rotor 3D temperature field distributions of different rotor winding inter-turn short circuit degrees or positions and the blocked rotor ventilation ducts were calculated and analyzed. Results show that the rotor winding inter-turn short circuit fault and blocked rotor ventilation ditch fault of the generator can cause an unbalanced distribution of the rotor temperature field. Thus, the higher the degree of the inter-turn short circuit, the greater the unbalance of the rotor temperature field, resulting in greater temperature increase. Moreover, the closer the position of the inter-turn short circuit is to the rotor teeth, the higher the distortion degree of the rotor temperature field. The influence of the blockage of air holes on the rotor temperature field is related to the blockage position. The blockage of a single duct causes an obvious temperature rise near the blockage point, whereas the blockage of double ducts has little effect on the overall temperature field. The results provide theoretical reference for the design, operation and maintenance of the turbo-generator through the 3D analysis of typical problems.
作者
马明晗
武玉才
李永刚
MA Minghan;WU Yucai;LI Yonggang(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2019年第5期1018-1023,共6页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51107039)
河北省自然科学基金项目(E2016505031)
中央高校基础科研资金项目(2016XS97)
关键词
核电
汽轮发电机
转子匝间短路
风路堵塞
温度场
对流换热
有限元法
故障诊断
nuclear power
turbo-generator
rotor winding inter-turn short circuit
ventilation duct blocked
temperature field
convective heat transfer
finite element method
fault diagnosis
