At present motor integrated protection device is widely used in industrial production. However, when stator winding short-circuit current is too large, it is easy to lead to the current transformer in saturation state thus cause the malfunction of the motor integrated protection device, because of the improper selection of parameters of current transformer. Therefore, by using the PSCAD/EMTDC software and simulation analyzing the performance of the current transformer for protection and miniature current transformer of motor integrated protection device after the low voltage motor stator winding fault, this paper puts forward to add the three sampling algorithm in motor protection device protection algorithm. Meanwhile, it takes advantage of MATLAB/Simulink’s simulation to verify the proposed measure. Besides, this measure overcomes the disadvantage of motor integrated protection device’s unreliable action as the main protection in the saturation of the current transformer, which is caused by the long sampling time of Fourier’s algorithm. So it could improve the safety and reliability of the low voltage motor protection device’s operation.