Author:
Du Shiyue,Li Hanlin,Shang Xin,Li Jiayao,Lang Yecun
Abstract
Abstract
In a pumped storage power station, equalization currents between the stator windings in phase are greater than the expected calculated value. Several 3D and 2D finite element calculations have been performed in this paper to evaluate the additional leakage reactance of the end winding for the different parallel paths. The calculation shows that the distribution of windings in the power plant leads to different leakage reactance values in the stator slots between parallel branches, resulting in a balanced current. The occurring equalization currents do not represent an issue for machine safety as they are not connected to machine asymmetries and do not lead to additional machine vibrations.