Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1977-10-19
1980-06-24
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 8, 361 13, 307134, H02H 722
Patent
active
042098149
ABSTRACT:
A high power a-c circuit breaker having substantially no arcing during interruption consists of two identical switching circuits in series which each include a main high speed switch connected in parallel with a series-connected diode and high speed isolating switch. The diodes of each of the switching circuits oppose one another in polarity. Current flow through the circuit breaker is normally through the closed main high speed switches. A polarity-sensitive operating circuit is provided to open the appropriate high speed switch just before a current zero and to transfer forward current through its related diode. This diode blocks a current reversal, and the associated series-connected isolating switch is opened just after current is commutated into the diode, and at or before the current zero time is reached and while the diode is blocking. Voltage distributing capacitors and non-linear resistors are connected in parallel with and distribute the voltage between the series-connected isolator switches and diode. A single one of the two identical switching circuits can be used for application to d-c circuits or for discharge currents having a single polarity.
REFERENCES:
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patent: 2748226 (1956-05-01), MacNeill et al.
patent: 3223888 (1965-12-01), Koppelmann
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patent: 3395316 (1968-07-01), Denes et al.
patent: 3402324 (1968-09-01), Kesselring et al.
patent: 3491315 (1970-01-01), Kesselring
patent: 3636292 (1972-01-01), Roth
patent: 3864604 (1975-02-01), Pfanzelt
Gould Inc.
Salce Patrick R.
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