Analysis on the Reliability of Wide Area Protection Communication System

This paper analyzes characteristics of the wide area protect communication system structure, and divides communication systems into the system protection center, backbone network, and regional communications systems. And regional communication system is divided into regional protection centers, regional networks and sub-station system. Then This paper analyzes the reliability of the fiber optic ring network which is used widely, and establishes the reliability model of each subsystem. As IEEEl4 bus for example, we calculate the reliability of each subsystems and overall system, then we get the sub-station is a bottleneck affecting the reliability of the entire communication system. But in wide area network, ATM switches are weakest link components. We use Bayesian network as reliability evaluation method. The reliability evaluation method of Bayesian network not only can be easily used to calculate the reliability, but also can find the thin section of system by its unique reverse reasoning technique. High-reliability Wide-area protection communication system is an important part of wide area protection system for its correct and reliable operation.