| Summary: | Power system modes can be controlled by use of a wide-area monitoring and control system (WAMS). It is based on the phasor measurement units (PMUs), connected by an infor-mation network covering a significant territory. The functioning reliability of such a network deter-mines to a big extend the correct operation of the entire monitoring system. To assess its reliability, the one can be decomposed conveniently into four components: hardware or technical reliability, traffic reliability, software reliability, resistance to external negative impact on the transmitted in-formation, and to consider each m independently. In this paper, the main attention is paid to as-sessment of the reliability and availability of the first three components in the information network.
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