Failure rate modelling of electric distribution overhead lines considering preventive maintenance

The electric distribution overhead lines are large-scale complex repairable systems that consist of numerous components. To obtain an acceptable level of reliability in overhead lines, an asset management strategy seems to be necessary. An asset management-based maintenance framework is introduced for overhead lines. Based on the proposed framework, a relevant failure rate model is developed, which is able to show the effect of preventive maintenance according to expending cost and other affecting factors. The application procedure of the proposed model is also discussed in overhead line maintenance planning. Five-year historical data of nine feeders are used to assess the proposed maintenance schedule in comparison to utility predefined one.