Finning Power Systems installs three Cat C175-20 generator sets to provide power in the event of an outage
Three Cat C175-20 generator sets have been installed to provide back-up power
Finning Power Systems has been appointed to deliver the new 11kV emergency electrical services standby generator system for Guy’s Hospital in London.
Part of Guy’s and St Thomas’ NHS Foundation Trust, the hospital is upgrading its old standby generator system to meet current and future demands for continuous power to sustain its worldwide recognition in the delivery of medical care.
In a hospital environment, standby power infrastructure is not just essential; it could mean the difference between life and death. Therefore, continuity of power is business critical. As part of the project, Finning is supplying three Cat C175-20 generator sets, each providing an output of 3200ekW, the highest output available from a single high-speed generator set in the UK market. Once installed these units will provide a combined 9600ekW of reliable, mission critical standby power.
The generator sets will be linked to the hospital’s existing logic control systems to ensure that standby power is readily available and appropriately prioritised within just 15 seconds in the event of an outage
Guy’s Hospital is currently building a new, state-of-the-art cancer centre, which will be a hub for South East London, providing specialist cancer services, training, development and research. The new centre will enable Guy’s and St Thomas’ NHS Foundation Trust to improve its cancer treatments and outcomes when it opens to patients in 2016.
As part of the ongoing upgrades, the hospital is increasing its electrical standby power capacity. Working with Eta Projects, the trust’s specialist power engineering consultant, Finning is supplying a generator system that will provide 100% of the standby power requirement to the cancer centre in the event of a mains power failure. In the event of a mains power failure across the entire hospital, the generator sets will provide approximately 80% of the standby power.
David Porter, head of compliance at Guy’s and St Thomas’ NHS Foundation Trust, said: “The process to upgrade the electrical standby power capacity at Guy’s Hospital began in early 2014. In consultation with Eta Projects, a detailed tender was published through the Official Journal of the European Union (OJUE). Due to the spatial constraints, we considered three different sizes of engines and appointed Finning, which offered the C175-20, because of its compact size and high power output.
“The small footprint of the C175-20 means that the new units can be housed within the existing generator rooms without any major building modifications.
“The generators are inter-connected to the main 11,000-volt electrical intake sub-station for the hospital through a dedicated generator distribution switchboard. The generator sets will be linked to the hospital’s existing logic control systems to ensure that standby power is readily available and appropriately prioritised within just 15 seconds in the event of an outage.”
The generators are designed to operate in synchronous parallel mode and as single systems through manual intervention by the hospital estates engineering team should the need arise.
Prior to delivery to site, the new generators were subjected to intensive factory testing, which included load bank testing for four hours at 100% load and a subsequent one-hour test at 110% load. In addition, transient load tests were applied at various step loads from 60% to 100%. As added value and to demonstrate confidence in the generators, the test engineers applied a single load step at 110% and the generators took the load without stalling.
The small footprint of the C175-20 means that the new units can be housed within the existing generator rooms without any major building modifications
The C175-20 is based on the proven Cat C175-16 platform. A ridged engine wiring harness protects critical engine circuits from damage and redundant control wiring minimises the impact of electrical faults.
In addition, the new C175-20 reduces operating costs by extending maintenance intervals. For prime and continuous power applications, oil change intervals are every 600 hours. For standby generator sets, a three-year oil change interval option is available. Equipment overhaul periods are also extended to 22,000 for 60 Hz units and 27,000 hours for 50 Hz units.
The first generator has been delivered and placed in situ, with final works underway to integrate it into the hospital’s electrical system. The final installation of the three C175-20 generator sets is due for completion in March.