Title: Battery/mains generator set for the production of interruption-free current

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Abstract: A battery/mains generator set for the production of a continuing electricity supply in the event of failure of the mains supply, the set comprising an a.c. machine capable of operating either as a generator or as a motor and, mechanically coupled thereto, a d.c. machine also operable either as a generator or as a motor, the a.c. machine being, in operation, permanently connected, with the mains supply through a static switch, which prevents back-flow of power into the mains, the a.c. machine, when mains driven, being operable as a motor and driving the d.c. machine, which then operates as a generator and charges a battery in accordance with a required I/V characteristic curve, and, on failure of the mains supply, the d.c. machine being operable as a motor powered by the battery to drive the a.c. machine as a generator, thereby providing an output supply to an external load in place of the mains supply, the set also including a current transformer connected to pass the reactive current flowing between the mains and the a.c. machine or the external load and to supply a potential regulator connected to control a controllable exciter winding of the a.c. machine, whereby the a.c. machine will be operated in accordance with the requirement of the external load for reactive power during mains operation.


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