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E L E C T R I C A L
M A I N T E N A N C E
Machinery and Equipment MRO
December 2020
Civil work for the temporary substation is being completed in the background. Sunnybrook remained powered from its existing substation in the foreground.
Part 2 – Project Phasing, Construction and Commissioning BY PHILIP CHOW AND BAVAN POOLOGARAJAH
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n part one (February 2020 issue) we discussed design considerations, planning and equipment selection decisions for upgrading the main outdoor electrical substation at Sunnybrook Health Sciences Centre. With an equipment package consisting of 38 kV class gas-insulated switchgear housed in customized E-Houses, four new 7.5/10 MVA KNAN/KNAF transformers, and an intelligent control and monitoring system pre-selected, the next challenge was developing a detailed project phasing strategy, which coordinated utility upgrades to the site, demolition and construction of a new substation, while maintaining a reliable power distribution system to the site, and implementing the phasing strategy over a two and half year construction schedule. “Sunnybrook’s main outdoor electrical substation is critical in providing reliable power throughout the entire campus,” said Michael McRitchie, Director of Plant
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Operations, Maintenance and Biomedical Engineering, Sunnybrook. “Minimizing power interruptions during construction was a key priority for the team.”
The temporary substation is nearly complete, with equipment landed and 5 kV feeders being installed to the hospital’s main 4.16kV distribution switchgear.
Photos: Philip Chow
MAIN ELECTRICAL SUBSTATION UPGRADES
At the onset of the project, coordination with the local electrical utility was an essential part of the planning process. Not only would Sunnybrook’s new main outdoor electrical substation provide critical power throughout the hospital, but it would interface with Toronto Hydro’s distribution system, which supplies power to the City of Toronto. Coordination on various design features, operational aspects and construction work was essential to ensuring a successful outcome. Frequent design, planning and construction meetings were held between the utility, project engineers and hospital staff, throughout the project. In addition to replacing end of life equipment at Sunnybrook’s existing substation, the project would incorporate a new utility circuit
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