Description: Critical energy infrastructure (CEI) is complex hierarchical cyber physical system that consists of power generation systems (sush as NPP, HPP, etc.) and power grid. NPP safety is important and inherent part of infrastructure safety. Smart grid is a new generation of CEI, where NPP is one of main power suppliers. Smart substation is interface between smart grid (its electrical network) and NPP. Substation reliability is an important factor for NPP and infrastructure safety as well. The substation operability is determined by its components’ reliability and cyber security. This paper suggests approach for consideration of substation reliability during infrastructure safety assessment based on joint application of Bayesian Belief Network and Fault Tree Analysis. The most critical substation assets that are important for substation operability are considered. The example of approach application is considered in the paper.
Keywords: critical energy infrastructure, smart grid, digital substation, the reliability, the Bayesian network of trust, fault tree method