A failure rate model for traction transformer based on PHM considering multiple factors

Abstract

A new failure rate model for traction transformer based on PHM is proposed in this paper in order to comprehensively evaluate the operational condition of traction transformer under the impact of multiple factors. The hazard function of this model consists of two parts: the baseline hazard function which reflects the ageing process and the link function in which equipment health status and weather condition are taken into consideration. The maximum likelihood estimation (MLE) method is applied to obtain the model's parameters with historical operational data. Case study shows that the model proposed can reasonably characterize the failure rate.