基于改良三比值法的变压器故障模糊综合评判法

摘要

溶解气体分析(DGA)是目前变压器在线监测的主要手段,但DGA方法实际运用中还存在不足之处,为此建立了基于改良三比值法的变压器绝缘模糊综合评判法.该方法通过模糊数学的隶属度理论把变压器故障的评判由定性评判转化为定量评判,并通过其在变压器在线绝缘监测中的应用案例证明了此方法的有效性,还进一步对未来更好的综合评判法提出了设想.%Dissolved gas analysis (DGA) is the main method for the on-line monitoring of current transformer.This paper points out the defects of DGA method in practical application,and presents the fuzzy comprehensive evaluation method for transformer insulation based on improved three-ratio method.This method converts the qualitative evaluation into quantitative evaluation of the transformer fault by using fuzzy mathematics theory of membership degree.The application examples of transformer insulation on-line monitoring prove the validity of this method,and finally the better comprehensive evaluation method is proposed for the future.