A DC Circuit Breaker Condition Evaluation Model Based on Health Indexes

Abstract

[Objective] DC circuit breaker is a key equipment in metro traction power supply system. To improve the reliability of the traction and power supply system through reasonable maintenance strategy, it is necessary to evaluate the health condition of DC circuit breaker accurately. [Method] Health indexes are used to characterize the overall health condition of the equipment and establish a comprehensive evaluation model of the equipment health condition. On the basis that the changes of the equipment characteristic parameters reflect the equipment health condition, evaluation indexes are reasonably selected and a multi-index evaluation system of equipment operating condition is established. With the method of hierarchy and entropy weight, the calculation method of the weight of each sub-index is improved, making the equipment health condition evaluation model more reasonable. The equipment health index is calculated based on the evaluation model, and the service life model based on historical health data is established to fit the trend of the equipment health index, evaluate the future health condition and predict the remaining service life. The proposed evaluation model is validated by the actual data of a traction substation. [Result & Conclusion] The example analysis results show that the proposed evaluation model of DC circuit breaker is effective and rational to some extent in that it can scientifically judge and predict the healthy condition and remaining service life of the DC circuit breaker.

Keywords

• urban rail transit
• traction power supply system
• dc circuit breaker
• condition evaluation
• health index
• lifespan model