Importance measures based risk and reliability analysis of substation automation systems

Abstract

Risk is the probability that an unwanted event may happen in the future that will effect in some harmful consequences. Risk analysis and maintenance of risky components of a system is essential to protect the system. Reliability Importance measures play an imperative part in ranking the components according to the impact on the system reliable performance. Risk based measures are useful in identifying the weak components and results in improving the reliability of the overall system. Risk and Reliability of Substation Automation System (SAS) are most significant and desirable design considerations. SAS consists of different components and its applications require real time performance. Three substation automation system architectures are considered in this paper. The important measures Improvement Potential (IP) and Risk Achievement Worth (RAW) are used to prioritize the components in two types of architectures of SAS. The reliability expressions of all system architectures are computed with the help of their respective reliability block diagrams. From the outcome of these two IP and RAW measures the components DCP, ESW are most important components in both maintenance and risk point of view.