Railway Power Transformer Reliability Evaluation Model Based on Operating Conditions

Abstract

Evaluating the railway power supply system reliability needs accurate failure rate models of equipment. However, the existing failure rate model can’t reflect the effect of the operating conditions and maintenance conditions of equipment. In this paper, a time-varying failure rate model of railway (35)10kV power transformer is proposed according to the Weibull distribution, considering the factors of altitude, ambient temperature, and maintenance conditions. The model also considers the manufactory correction factor obtained from the historical data. The results show that for different combinations of factors, the failure rate curves of transformers are different. The model proposed can present the relationship between the failure rate of transformers and the parameters of operating conditions and the maintenance situation. Hence, it is more applicable for reliability evaluation of the whole railway power supply system, which can provide support for formulating maintenance plan and scheduling field operation.