Nuclear-grade electric valve thermal overload protection setting and checking method and system

The invention relates to a nuclear-grade electric valve thermal overload protection setting and checking method and system. The method comprises the steps that the maximum torque of a valve during working is obtained; the maximum working current of the motor is determined according to the maximum torque of the valve; working system correction is carried out on the maximum working current, and an overload protection initial constant value is set according to the corrected maximum working current; verifying the current protection setting value, and if all verification conditions are met, judging that verification is passed; the verification conditions comprise that the relay protection device does not operate mistakenly in the working cycle of the valve, the relay protection device does not operate mistakenly in the acceleration process of the motor, and the temperature rise of the motor does not exceed the limit value when the relay protection device acts. By implementing the method, the protection setting val