AC Frequency and phase synchronizer

Details AC Frequency and phase synchronizer AC Frequency and phase synchronizer

1982-12-27

1983-10-11

Goldberg, Elliot A.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Series-connected sources

310114, 307 87, H04B 344

Patent

active

044094914

ABSTRACT:
A system for detecting frequency and phase-angle synchronism between local and utility power sources comprising a pair of identical permanent magnet synchronous motors respectively connected to the power sources and having output shafts in opposed alignment. Fingers mounted on the motor shafts effect electrical interconnection between the motor housings, which are ungrounded, when the power signals are at identical frequency and in phase. An SCR is responsive to such interconnection to energize a relay and interconnect the power sources.

REFERENCES:
patent: 4249088 (1981-02-01), Kleba et al.
patent: 4333021 (1982-06-01), Cresap et al.

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