Research on Transposition Methods of the Stator Bars for Huge Hydro-generator

摘要

There are a lot of circulating current existed between strands of the stator bars. The circulating current losses could be limited in a certain range by the traditional transposition methods , while the losses can not be reduced more. In this paper, the arrangement of the strands of the transposition methods is improved which named odd strands arrangement. On the basis of the detailed description of the odd strands arrangement, taking a huge hydrogenerator as an example, the circulating current losses of traditional strands arrangement and odd strands arrangement under the four stator bar transposition methods are calculated accurately using leakage potential method, the distributions of circulating current and the circulating current losses of all the strands in a bar are also obtained. The results show that odd strands arrangement is beneficial to decrease the circulating current losses in the stands of the stator bars of hydro-generator obviously. The conclusion provides a theoretical reference for the project design.