摘要
为了保障核电汽轮发电机的绝缘安全和提高运行效率,在工程中一般采用定子双罗贝尔换位线棒来减小股线环流损耗.针对传统解析法无法精确计算股线沿换位路径所有的漏磁分布情况,以一台600 MW汽轮发电机为例,建立齿槽定子线棒双罗贝尔换位方式三维实体模型,结合场路耦合法进行数值计算.通过对线棒不同换位编织方式的对比分析得出,采用不等换位节距,长换位节距越靠近槽中心段,股线数目越少,空心股线空心率越高,则槽中心线磁通密度Bx分量沿轴向的"凸起状"越不明显,股线电流有效值的差异性越小,股线的环流损耗越小.
Stator double-Roebel transposition bar was used to reduce circulating current losses in engineering in general in order to guarantee insulation safety and improve operational efficiency of nuclear turbo-generator. Traditional analytical method can not accurately calculate all distributions of leakage magnetic flux along the strand transposition path. A 600 MW turbo-generator was set as an example and three-dimensional solid model of stator bars with double-Roebel transposition way in a single slot was established. The field-circuit coupling method was used in numerical calculation. Comparative analysis of different transposition weave ways of bar showed that if unequal transposition pitch was adopted, the long transposition pitch was near slot center section, the number of strands was fewer and the hollow ratio of hollow strands was higher. Then ＂convex＂ of flux density Bo component of groove centerline along axial direction was less obvious, the difference of current virtual value among strands was smaller and the circulating current loss of strands was smaller.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2014年第4期616-624,640,共10页
Journal of Zhejiang University：Engineering Science
关键词
核电汽轮发电机
双罗贝尔
换位
环流损耗
nuclear turbo-generator
Double-Roebel
transposition
circulating current loss
