8.0 GROUND RECEIVING AND DISTRIBUTION SITE ' 8.1 REQUIREMENTS AND ANALYSES Only preliminary analyses have been made to define the requirements and concepts for an SPS ground system required to interface the SPS with the existing utility systems. Subsequent integrated system studies that include the involvement of the utility industry are planned to establish specific realistic design and operational criteria. The primary functional requirements of an SPS ground system are summarized as follows: • Receive microwave energy from the SPS and convert it to electrical energy. • Condition power with the proper characteristics. • Measure and control the power routing. • Deliver electrical power to existing utility system(s). • Provide a reliable means of monitoring and controlling the microwave beam and SPS subsystems, as well as ground subsystems. • Provide the necessary protection and fault isolation capabilities for the system. • Provide communications and data management capabilities to enable monitoring, assisting, or directing operational activities and to ensure crew safety. The major objectives of the SPS ground system design will be: • To provide low maintenance subsystems and equipment capable of handling up to 10 GW of power. • To assure that the overall SPS system will be safe and provide dependable service for at least 30 years. • To minimize the size of operational crews and costs. • To economically optimize system performance.
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