Relevance of the Use of Combined Methods for Calculating the Reliability of the RPA of the Digital Substation in the Mass Use of ICT, Taking Into Account the Impact of Cyber Attacks

The Russian electric power industry is moving towards large-scale digitalization of technological processes of generation, transmission and distribution and consumption of electricity, as well as business processes through the introduction of a large number of solutions based on information and communication technologies (ICT) at power plants and substations. The method for assessing the reliability of fully digital subsystems of the facility level, such as: relay protection (RPA), Supervisory Control And Data Acquisition (SCADA), etc. is a debatable issue. An additional factor affecting the reliability of digital systems is the impact of computer attacks, the intensity of which is growing every year. These issues become especially critical for the relay protection subsystem, since failures in its operation can lead to accidents at individual technological facilities and have a negative impact on entire energy associations and systems.