高海拔地区18 kV水轮发电机定子绕组端部防晕技术研究  

Research on stress grading technology of stator winding overhang for 18 kV hydro-generator in high altitude area

作　　者：张鹏 刘枰 刘学忠[2] 毛继业 黄亿良 ZHANG Peng;LIU Ping;LIU Xuezhong;MAO Jiye;HUANG Yiiang(Zhejiang Fuchunjiang Hydropower Equipment Co.,Ltd.,Hangzhou 311504,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]浙江富春江水电设备有限公司,浙江杭州311504 [2]西安交通大学电工材料电气绝缘全国重点实验室,陕西西安710049

出　　处：《绝缘材料》2024年第7期68-75,共8页Insulating Materials

摘　　要：为满足海拔高度为2 500 m的某大型水电站18 kV水轮发电机的防晕要求,本文从理论方面分析了目标海拔高度下的空气击穿场强及影响因素,并通过建立定子绕组端部三维仿真模型评估了端部电场特性,分析了间隙距离与绑扎结构对端部斜边电场的影响,确定了定子绕组端部斜边最小间隙距离控制在15 mm的方案。最后,在构建的大型高海拔环境模拟试验室完成了18 kV水轮发电机定子线圈和绕组的防晕性能进行测试验证。结果表明:该18 kV水轮发电机的防晕性能良好,满足在2 500 m海拔高度下的防晕要求。In order to meet the stress grading requirements of the 18 kV hydro-generator in a large hydropower station with an altitude of 2500 m,the air breakdown field strength and its influencing factors at the target altitude were analyzed theoretically,and the overhang electric field characteristics was evaluated by establishing a three-dimensional simulation model of stator winding overhang,the influences of the clearance distance and binding structure on the electric field at overhang hypotenuse were analyzed,the scheme of controlling the minimum clearance distance at the overhang hypotenuse of the stator winding to 15 mm was determined.Finally,the stress grading performance of 18 kV hydro-generator stator coil and winding was tested and verified in a large high-altitude environmental simulation laboratory.The results show that the stress grading performance of the 18 kV hydro-generator is good and can meet the stress grading requirements at an altitude of 2500 m.

关 键 词：高海拔 水轮发电机 防晕 端部电场仿真 起晕电压 

分 类 号：TM303.1[电气工程—电机]