Lawrence Crompton and Chris More of Siemens, and Regional Partner at DSSR, Derek Jolley, describe a project to replace the electrical emergency power system at a large acute hospital.
This paper describes the replacement of a hospital emergency electrical power management system, detailing the unique functionality demanded by the operation of a large hospital. The availability of the latest sub-station control standards, such as IEC61850, GOOSE messaging, and Parallel Redundancy Protocol (PRP), allows the high-speed implementation of power management functions in optimum methodology.
The electrical power demands of large modern hospitals require an extensive medium voltage distribution system to deliver power across the site. Typical loads are in the region of 5 MW or greater, which are typically from a large primary board feeding a ring distribution network into a number of secondary sub-stations with redundant distribution transformers in each substation. Due to the criticality of the hospital operations, 100% back-up generation is provided to allow high-speed restoration of power in event of power outages.
The unique requirements of the hospital power system control are to control the transformer loads in such a way that:
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