2results about How to "Judgment accurate judgment" patented technology

This invention discloses a method and apparatus for determining the tail current of a current transformer based on waveform fitting. The method includes: acquiring a sequence of current sampled values ​​within a target time window; determining a fitted waveform based on the current sampled value sequence; calculating the correlation coefficient between the fitted waveform and the actual value within the time window; and determining whether the correlation coefficient is greater than a preset threshold value; if so, the current is determined to be a tail current. The technical solution of this application, based on waveform fitting and a precise tail current sampling value model of the protection device, can accurately determine the tail current of a current transformer.