A properly-designed online UPS provides its critical load with excellent protection from utility mains power disturbances, and brief outages of a few seconds or possibly minutes. However, to ensure uninterrupted power to the load throughout an extended blackout, a generator must be used to complement the UPS. In this article, Alan Luscombe, director at Uninterruptible Power Supplies, looks at the issues that must be recognised and resolved when bringing a generator and a UPS together in a power protection system.
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