Cross-start bus configuration for a variable speed constant freq

Details Cross-start bus configuration for a variable speed constant freq Cross-start bus configuration for a variable speed constant freq

1989-01-26

1990-10-30

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural load circuit systems

Plural sources of supply

290 4R, 290 38R, 322 10, 307 45, H02J 300, F02N 1100

Patent

active

049670964

ABSTRACT:
This invention relates to a bus configuration for a dual channel variable speed constant frequency motor/generator aircraft power system providing for both power generation and engine starting. The subject invention provides for isolation of faults which can occur in long power feeders. Further, the subject invention provides for a novel start mode of operation which allows one channel to provide power to the other channel, thereby avoiding inefficient multiple converter operation and potentially faulty power buses. The bus configuration provides for coupling a first motor/generator to a second motor/generator via a first converter to thereby allow th first motor/generator, operating as a generator, to supply variable frequency power to the first converter, the first converter supplying variable frequency power to the second motor/generator to operate the second motor/generator as a motor. A cross-start circuit is provided for selectively coupling the first channel to the second channel to allow power to be transferred between the first channel and the second channel is supplied to allow the novel start mode. The cross-start circuit completely decouples from the first and second channels when the cross-start circuit is electrically faulted, resulting in electrical isolation of the first and second channels from the fault thereby allowing continued operation of the first and second channels.

REFERENCES:
patent: 4321645 (1982-03-01), Thom et al.
patent: 4330743 (1982-05-01), Glennon
patent: 4403292 (1983-09-01), Ejzak et al.
patent: 4456830 (1984-06-01), Cronin
patent: 4481459 (1984-11-01), Mehl et al.
patent: 4645940 (1987-02-01), Wertheim
patent: 4786852 (1988-11-01), Cook

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