Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1976-01-08
1978-01-10
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 7, H02H 722
Patent
active
040682730
ABSTRACT:
A hybrid AC power switching arrangement in which two ganged switch banks in series are employed along with a pair of reverse parallel (back-to-back) SCRs across each contact pair of the second switch gang. SCR control means and interlock control means are provided so that the first switch gang (closest to the power source) closes first, energizing the SCR control and permitting the SCRs to conduct load current in a corresponding phase leg, beginning at or near a zero voltage cross-over point. After all phase legs are conducting through the SCRs, the second switch gang is closed bypassing the SCRs. On circuit break, the second switch gang (i.e., the one closest to the load) is opened first, the load current diverting immediately through the SCRs for another interim period until the SCRs in each individual phase leg are extinguished as the instantaneous current in the corresponding phase lead passes through or near zero. The first switch gang is then opened to completely disconnect from the line to insure against spurious SCR operation thereafter.
REFERENCES:
patent: 3401303 (1968-09-01), Walker
patent: 3430063 (1969-02-01), Webb
patent: 3458800 (1969-07-01), Bross
patent: 3614464 (1971-10-01), Chumakov
patent: 3665212 (1972-05-01), Roberts et al.
patent: 3881118 (1975-04-01), Forrest et al.
patent: 3890560 (1975-06-01), Huellinghorst
International Telephone and Telegraph Corporation
Miller J D
O'Neil William T.
Salce Patrick R.
LandOfFree
Hybrid power switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hybrid power switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hybrid power switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2274471