An Optimal Model for Planned Maintenance of Electrical Equipment Based on Availability Constraint

At present, the periodic preventive maintenance strategy is widely used to carry out periodic maintenance of electrical equipment. However, due to the aging characteristics of electrical equipment, the failure rate of equipment inevitably increases with the increase of service life, which directly affects the steady state availability of equipment. Based on the analysis of the maintenance cost of electrical equipment, a mathematical maintenance model for minimizing the cost rate per unit time in the whole maintenance cycle of electrical equipment is established by introducing the age reduction factor. Furthermore, the optimized strategy considers the failure rate threshold based on availability in actual operation, which well coordinates the reliability and economic costs of equipment operation. Finally, taking a circuit breaker whose life obeys Weibull distribution as an example, the simulation results verify the superiority of the proposed strategy, which can provide a powerful scientific decision for the planned maintenance of equipment.