Analysis of Reliability and Component Importance for All-digital Protective Systems
Xiang Gao · Proceedings of the CSEE · 2008
The reliability issue of the all-digital protection system is investigated from the aspects of overall reliability and component importance respectively. The paper develops the overall reliability models based on the reliability block diagram and connection matrix methods. It then investigates and selects two appropriate measures of the importance. The first is the probability importance used to identify the weak points of the protection system and to prioritize the system design. The second measure uses criticality importance to prioritize maintenance actions. To demonstrate the proposed method,this paper first introduces six alternative architectures of all-digital protection systems. Afterwards,the associated overall reliability as well as component importance are calculated and discussed.