Method for distinguishing effectiveness two-time continuous sampling values of electric power system

The invention relates to a method for distinguishing effectiveness two-time continuous sampling values of an electric power system, which comprises the steps of: establishing a saltus threshold formula of sampling values of curved continuous points and a saltus threshold formula of sampling values of curved discontinuous points, ensuring that the sampling points with saltus values exceeding the saltus threshold of the sampling values of the curved continuous points become the discontinuous points of a curved line, but are used as effective sampling values of the curved line, wherein the saltus values are less than the saltus thresholds of the sampling values of the curved discontinuous points; and analyzing the application of the limit of the minimum precision threshold of a mutual inductor and the periodical characteristic of a current voltage signal of the mutual inductor to the process of judging the effectiveness of the sampling values. On the basis, a delay 3-point continuous effective judgment method an