Online setting method and device for characteristic threshold value of leakage current
A leakage current and threshold technology, which is applied in the direction of measuring devices, fault locations, and measuring electrical variables, can solve the problem that the leakage current threshold cannot change with environmental changes, and achieve accurate criterion conditions and accurate threshold intervals.
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[0075] Further, based on the above scheme, the present invention provides an optimal implementation mode, specifically as follows:
[0076] (1) Obtain the original sample data of the real-time leakage current amplitude recorded over a period of time {X i ,i=1,2,…N}, let the maximum value be X max , the minimum value is X min ;
[0077] (2) Arrange the original sample data of the leakage current amplitude in a period of time from large to small, and divide L gray levels according to the leakage current amplitude, and the gray level uses gray value j=1,2 ,...L said;
[0078] (3) order Statistics fall in [(j-1)d x ,jd x ] The number of leakage current samples in the range n j , N=n 1 +n 2 +… n L ;
[0079] (4) Calculate the probability of occurrence of gray value j as
[0080] (5) Set the threshold kd x , divide the original sample sequence into two categories: C 0 Indicates that the range is in [0, kd x ] in the value; C 1 Characterization range in [(k+1)d x ...
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