36 TRANSFORMER REPLACEMENT


Super low loss amorphous transformer replacement


Research by The University Hospital of South Manchester identified super low loss amorphous transformers as an extremely cost-effective infrastructure upgrade which would not only provide guaranteed energy savings through reduced transformer losses but deliver substantial additional savings through inbuilt voltage management capabilities. Next, The Hospital Trust turned to Wilson Power Solutions Ltd to provide it with seven replacement supply transformers, reports WIP.


T


he University Hospital of South Manchester is recognised as the


“greenest” hospital in the UK


and has recently been widely acknowledged as the most environmentally-friendly in Europe. With onsite genera- tion, modern LED lighting systems and efficient controls already in place, the energy and environmental manager was looking for additional areas which could drive energy savings. With the installation of two


Wilson e2 Super Low Loss Amorphous Transformers onsite, a Load Survey was conducted to quantify the energy savings. Power analysing monitoring equipment was connected at each main incoming LV supply and left in situ for 17 days. The


“This was an extremely cost- effective infra- structure upgrade which not only provided guaranteed energy savings through reduced transformer losses but delivered substantial


additional savings through inbuilt voltage


management capabilities.” - NHS Estates Manager


measurements show that the installation of the Super Low loss Amorphous Transformer, combined with a 6.3% and 6.6% voltage reduction, reduced the kWh used.


Worldwide Independent Power June 2018 The measurements taken


before installation and those with the super low loss trans- former shows a 5.9% and 6.0% reduction in kWh respectively. The savings are estimated to be £31,010 p.a. total (based on 9p/kWh). The kWh reduction can be trended long term using the electricity supplier’s half hourly averaged value data. The reduction in voltage has


also improved the site power factor. Generally, the voltage


supplied to many sites is higher than it needs to be. The network operator often keeps the Primary Voltage high to reduce transmission losses while keeping the voltage within statutory limits for all customers on the network. In 2008 the


final stage of the www.gmp.uk.com


European Voltage Harmonisation came into place setting the voltage levels to 230V ± 10%. The statutory limits for voltage are now from 207 to 253V phase-neutral. Most sites have a L-N voltage


of 240V or higher giving rise to equipment running at inappropriate levels resulting in additional costs. Reducing and maintaining


the voltage at the most favourable level is an established way to significantly reduce energy consumption and costs whilst having the additional benefits of reduced maintenance and increased equipment life, reports the company.


www.wilsonpowersolutions.co.uk


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