Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1991-02-11
1993-03-30
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
322 11, 307 46, 307 67, 307 68, H02J 300
Patent
active
051986981
ABSTRACT:
An auxiliary power supply system includes an internal combustion engine driving an alternator the output of which is rectified and supplied to DC bus lines across which a storage battery is connected. The DC bus lines may supply a consuming device such as an uninterruptible power supply or telecommunications system. The voltage across the bus lines is sensed and when the voltage drops below a selected value, indicating that the consuming devices is drawing power from the battery beyond a desired limit, the engine is turned on for a period of time to warm it up, during which the power from the generator is not supplied to the DC bus lines. Thereafter, the generator supplies power to the DC bus lines to supply the consuming device and partially recharge the battery until the consuming device is no longer drawing power, after which the engine is shut off. The power supply system includes a controller which monitors the intervals of time between turn-ons of the engine and if a selected period of time is exceeded, the engine is started without supplying power from the generator to the DC bus lines to allow the engine and generator to warm-up, enhancing maintenance of the system. The operating characteristics of the engine and generator are sensed and stored for access by an operator and warnings are provided if these conditions exceed acceptable limits.
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Colburn Robert
Leonard Murray
Mengelt Kevin
Paul Steven
Schultz Mark
Best Power Technology, Inc.
Gaffin Jeffrey A.
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