Method for carrying out piecewise fitting on probability distribution of regional lightning current amplitudes based on SPSS (statistic package for social science)

The invention discloses a method for carrying out piecewise fitting on the probability distribution of regional lightning current amplitudes based on SPSS (statistic package for social science), which comprises the following steps: S1, recording lightning location data of each lightning in a region, wherein the lightning location data comprises specific lightning sites and lightning current amplitudes I; S2, carrying out statistics on the lightning location data through Excel software so as to obtain a cumulative probability P (>I) of different lightning current amplitudes; S3, screening the lightning location data: only taking negative-polarity lightning currents with a lightning current amplitude of 0-200 kA into consideration; and S4, dividing the lightning current amplitudes into three intervals, namely, (0, 13], (13, 45] and (45, 200], and taking set values with a confidence probability of 95% to carry out fitting. According to the invention, the distribution rule of lightning current amplitudes of a region can be reflected more truly, and more accurate basic data can be provided for calculation of the lightning trip-out rate of lines, so that the lightning protection design and operation maintenance of electric transmission lines can be instructed more scientifically, thereby effectively reducing the lightning trip-out risks of lines, and generating obvious economic benefits and social benefits.