Reliability evaluation and design of intelligent switchgear controller in power distribution automation system

Intelligent switchgears such as auto-recloser and sectionalizer are pivotal devices in distribution automation system. Steady working in the execrable outdoor environment and strong, electromagnet interference circumstances is the requirement to intelligent switchgear. This paper analyzes the failure mechanism and probability distribution of components in the intelligent switchgear controller that we designed, establishes the system reliability structure model and mathematical model. Through reliability evaluation, the weak links in the system are found out A synthetic optimum method including redundancy techniques vote system, derating design, electro-magnetic compatibility and software anti-interference is proposed to enhance the reliability of controller The analyzing and running result shows that, by the reliability optimum design, the controller system can get higher reliability and performs more cost-effective.