Sudden short circuit is a serious transient process though it is short in time. In this paper, 3D transient equations of heat conduction as well as its equivalent functional equation are presented. Short circuit current of stator is performed. Sudden short current and heat of the stator are analyzed and calculated. Base on the construction symmetry of ventilating system in hydro the solution region of stator temperature field is determined as the range of half tooth, half trough and half axial core section, and heat dissipation coefficients of each surface and equivalent heat conductivity coefficients of iron and stator winding considering the insulation layers. In addition, the heat sources are analyzed. Finite element method (FEM) software-ANSYS is applied to calculate the transient temperature field of a kind of 125 MW hydro-generator under sudden short circuit
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