Deformation of turbo-alternator rotor windings, due to Temperature Rise

The paper deals with a problem of axial deformation of the rotor windings of turbo-alternators having long rotors. This trouble has only been experienced in recent years, and while the cause has been referred to by other authors the reasons why only a part of the winding has been affected have not been explained. The present paper deals with the effect of temperature on the amount of deformation of different conductors throughout the depths of the slots, and shows that a comparatively small increase in temperature-rise may cause the deformation to become serious. A graphical method is given by which it is possible to determine whether a given temperature-rise will cause the deformation to become serious. The effect of different methods of applying excitation is set forth.