Design of a Monitored Automatic Transfer System to Improve Electrical Continuity in Healthcare Facilities

Abstract

This paper develops the design of a monitored load Automatic Transfer Switch (ATS) to ensure electrical continuity in the HBT, achieving the overall objective in an innovative way and applying SDG 9. The load study determined a projected demand of 1,412.57 kW, which allowed for the appropriate selection of a 1600 kVA transformer and the configuration of two generator sets: the existing 420 kW set and a second 1380 kW set. This combination ensured total coverage of the demand with a reliability margin of over 20%. Critical loads were classified, fulfilling one of our research objectives. Critical areas were prioritized because they required immediate autonomy, for which an 80 kVA UPS system was implemented. The selection and sizing of the TTA, UPS, transformers, generators, and control devices was completed based on electrical calculations. A 10-second switching logic was defined, complying with NFPA 110 regulations and ensuring safe and reliable operation. Finally, operational validation demonstrated that the designed solution increases the reliability of the hospital's power supply by 12%, fulfilling the fourth specific objective