Abstract: The invention relates to a method and a device for improving elevator maintainability, comprising: selecting an efficient point; performing technical measurement to obtain a load?current changing curve and a current?time changing curve of the car; evaluating a mean value of the curve; generating a threshold; and counting to generate an inevitable remaining life ?t21, wherein ?t21=t2?t1. The inevitable remaining life ?t21 is determined by the abnormal time threshold t1 and the defect time threshold t2, and is only related to the load?current changing curve and the current?time changing curve of the car, so that a user is capable of directly predicting the inevitable remaining life of the elevator, which presents excessive or missing maintenance, saves a maintenance industry, and belongs to the category of original intelligence.

Abstract: A method and a device for improving current transmission reliability are provided. The method includes: selecting effective points; performing technical measurement; generating a threshold: generating a critical abnormal alarm time threshold t1, generating a critical defect alarm time threshold t2, and generating a non-critical abnormal electric leakage threshold t3; and generating a necessary remaining life number ?t21, wherein ?t21=t2?t1. By judging whether a current carrying capacity passing through an electric transmission line portion at a certain time exceeds an allowable current carrying capacity, the alarm time threshold t1 is far lower than 20%, an alarm is capable of being given for an abnormal situation in time, and a necessary remaining life of an electric device or system can be predicted by randomly measuring an input current Iin i, an output current Iout i, and errors of input and output currents, so that cross liability is avoided.