Different disposition of main protection for different types of generator

The space distribution difference of three-phase winding leads to the variation of inter-nal stator winding faults in location and type,so that different types of generator need to select different disposition of main protection to fit them.The improper copy method that different types of generators with the same rated capacity and voltage use the same disposition of main protection could be improved step by step after the proper short-circuit current calculation of stator winding is fulfilled.The proposed design method is explained with the main protection scheme design for Pingban generator.