The capacitance loss of film capacitors for AC application is existed in long term operation in high temperature and high humidity environment

which causes adverse effect for the operation of capacitor.In this paper

the polypropylene film capacitor is taken as an object

the high temperature and high humidity accelerated aging test platform for the polypropylene film capacitor is established and the lifetime data of the capacitors under different temperature and humidity conditions is obtained.The two-parameter Weibull distribution model is used to describe the lifetime distribution of the film capacitor.And a lifetime prediction of the film capacitor under different temperatures and humidity conditions is studied based on the Arrhenius model and inverse power law model.It is shown by the result that the reduction amplitude of capacitance of the film capacitor increases with the increase of temperature and humidity within the same time.The Weibull distribution of capacitor life is shifted to the direction of life decrease.The lifetime model parameters are obtained by the life data of the capacitor prototype under different temperature and humidity conditions

thus the life of the film capacitor can be predicted.