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Abstract
In remote locations, very small aperture terminal (VSAT) satellite networks are frequently a reliable and cost-effective solution for supervisory control and data acquisition (SCADA) installations. SCADA on VSAT exemplifies several of the key advantages of satellite networks. The cost of satellite equipment and service has decreased significantly in the past 18 months. The costs of the supporting network infrastructure and its management can be shared among many customers. National Fuel Gas Supply operates 3,000 miles of gas transmission lines in western Pennsylvania and has used VSAT satellite networks for much of its SCADA application since 1989 in both primary and backup roles. Because of the inherent delay in satellite systems caused by the long signal path through space, at critical remote terminal units, National uses leased lines for primary service and satellite links for backup. According to Herb Caldwell of Buckeye Power of Ohio, deregulation creates a strong growth potential for the use of satellite SCADA systems in the electric power industry.