1results about How to "Realize data backup" patented technology

The invention belongs to the technical field of iron core grounding current monitoring of transformers, and particularly relates to an iron core grounding current recording method based on precise time synchronization. Comprising the following steps: collecting a current signal through an iron core and a clamp grounding current sensor; time deviation caused by RTC is calibrated continuously in the collection process; performing cyclic sampling and calculation on an output signal of the sensor, sending total current and multiple harmonic waves obtained by Fourier calculation to a display end of an upper computer, and starting fault recording when the value of the total current meets a fault judgment threshold value; when it is judged that a fault occurs, an accurate time mark is provided through an accurate time synchronization function, reserved historical data and collected real-time data are spliced into a wave recording graph during the fault period, and the wave recording graph is backed up and transmitted to a display end of an upper computer to be stored and displayed. According to the invention, some fault phenomena which are short in duration and rapid in generation and disappearance can be effectively monitored, and the change trend of iron core and clamp current when faults occur can be effectively monitored.