Abstract: Introduces the automatic evaluation method of coordinated configuration of excitation transformer overcurrent protection based on State Gird smart grid dispatching technical support system（D5000 system）. Taking excitation transformer overcurrent protection and excitation system forced excitation as the research object, the automatic checking method of coordination configuration of excitation transformer overcurrent protection is given by studying the coordination and matching relationship between them, which can quickly evaluate the rationality of fixed value of excitation transformer overcurrent protection, and prevent excitation overcurrent protection misoperation which endangers the safety of unit operation.