Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1991-10-07
1993-08-17
Pellinen, A. D.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 43, 307 87, H02J 700, H02J 900
Patent
active
052372081
ABSTRACT:
In an apparatus for parallel operation of plural uninterruptable power source devices, each power source device includes at least one of an operation mode monitor for a logic operation on the output of the AC input monitoring circuit of each of the uninterruptable power source devices to feed the result thereof as a mode controlling signal to the mode controller, a parallel synchronizing signal generator for a logic operation on the output of an oscillating circuit which drives the invertor in each of the uninterruptable power source devices and, on detection of abnormality in the AC input, feeds the result thereof as a trigger pulse to the oscillating circuit, and a synchronization monitor for a logic operation on the output from the oscillating circuit in each of the uninterruptable power source devices and, when the differences between the phase of the output from the oscillating circuit of one of the triport uninterruptable power source devices and that from the oscillating circuits of remaining triport uninterruptable power source devices exceed the prescribed level, issuing a parallel operation release signal to open the switch of said one triport uninterruptable power source device that permits it to operate in parallel.
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Kawata Yasuhiro
Koike Hidehiro
Tominaga Fukutoshi
Fleming Fritz M.
Nishimu Electronics Industries Co., Ltd.
Pellinen A. D.
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