No-brake power transfer phase balance sychronization sense circu

Details No-brake power transfer phase balance sychronization sense circu No-brake power transfer phase balance sychronization sense circu

1995-01-25

1996-09-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 78, 307 51, 307 64, 307 87, H02H 318

Patent

active

055551513

ABSTRACT:
A poly-phase no-break power transfer phase balance synchronization sense circuit for an electric power generation and distribution system having a present source of electric power supplying poly-phase AC electric power through a first contactor to utilization equipment and a target source of electric power connectable to supply poly-phase AC electric power to the utilization equipment through a second contactor, a transfer of the source of AC electric power from the present source to the target source being accomplished by closing the second contactor prior to opening the first contactor upon synchronization of the two sources, comprises a circuit for rectifying the poly-phase AC electric power generated by the present source, the circuit generating a first rectified output signal, a circuit for rectifying the poly-phase AC electric power generated by the target source, the circuit generating a second rectified output signal, and a circuit for differentially summing the first rectified output signal and the second rectified output signal. This summing circuit generates a synchronization error signal in response to any phase of the poly-phase AC electric power generated by the present source differing in magnitude, phase relationship, or frequency from an associated phase of the poly-phase AC electric power generated by the target source. This synchronization error signal varies in magnitude in response to the magnitude of the difference. The circuit further comprises a circuit for generating a power transfer inhibit signal when the variable magnitude of the synchronization error signal exceeds a predetermined threshold.

REFERENCES:
patent: 3493778 (1970-02-01), Cutler et al.

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