The invention relates to a composite insulator
ageing state comprehensive evaluation method based on multi-characteristic vectors. According to the method, the
mathematical theory of fuzzy variable weights is introduced into state evaluation of
composite insulators, parameters which comprehensively and accurately reflect the working states of the insulators are separately selected, an improved
analytic hierarchy process (IAHP) is adopted, and opinions of an
expert group are processed. On the basis of constant weights, data of the insulators is combined, and variable weights of all factors are determined. Before indexes are adopted to conduct state evaluation, all the indexes are subjected to normalization, quantitative data is transformed according to corresponding formulas, a
scoring system is adopted for qualitative data, the
score ranks from zero to one, the
distribution function which combines half trapezoid and triangle is adopted to determine the membership degree, and the influence of all index quality on the insulator state is synthesized by adopting a multilevel fuzzy comprehensive evaluation method. According to the method, related state parameters are organically and comprehensively combined, the accurate and positive evaluation on the state of the insulators in running is made, and the method has the practical value.