Patent US3714510A successfully refreshed from Google Patents.
US3714510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for ignition of crossed field switching device for use in a hvdc circuit breaker
Assignee: Raytheon Co
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Filing: 1971-03-09
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Granted: 1973-01-30
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Expires: 1991-03-09
Abstract
Abstract Ignition method and apparatus for crossed-field switching device for onswitching the device when a high voltage is applied thereacross, comprising applying a plasma puff between the electrodes to initiate arc discharge therebetween, followed by resonantly reducing the current to zero to extinguish the arc and permit initiation of glow mode discharge after the current zero.
Inventors
- 👤 G Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:39
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
An apparatus for ignition of a crossed-field switching device to turn on the crossed-field switching device when a high potential is applied to the crossed-field switching device, said crossed-field switching device comprising: concentric anode and cathode electrodes having an annular space therebetween, magnetic field means for applying a substantially axial magnetic field to the interelectrode space and a gas within the interelectrode space so that, during conduction of the crossed-field switch device, current can pass between said electrodes in the glow discharge mode, the improvement comprising: a plasma injector positioned adjacent said electrodes for injecting plasma into the interelectrode space and resonant means connected to said elecTrode so that the injection of plasma into the interelectrode space causes interelectrode metallic arc discharge to reduce the potential between said electrodes and said resonance means induces a current zero to extinguish the metallic arc mode discharge and permit initiation of glow mode discharge.
Claim 2
Independent Claim
151 words
An apparatus for ignition of a crossed-field switching device to turn on the crossed-field switching device when a high potential is applied to the crossed-field switching device, said crossed-field switching device comprising: concentric anode and cathode electrodes having an annular space therebetween, magnetic field means for applying a substantially axial magnetic field to the interelectrode space and a gas within the interelectrode space so that, during conduction of the crossed-field switch device, current can pass between said electrodes in the glow discharge mode, the improvement comprising: a plasma injector positioned adjacent said electrodes for injecting plasma into the interelectrode space and resonant means connected to said elecTrode so that the injection of plasma into the interelectrode space causes interelectrode metallic arc discharge to reduce the potential between said electrodes and said resonance means induces a current zero to extinguish the metallic arc mode discharge and permit initiation of glow mode discharge.
Claim 3
Independent Claim
151 words
An apparatus for ignition of a crossed-field switching device to turn on the crossed-field switching device when a high potential is applied to the crossed-field switching device, said crossed-field switching device comprising: concentric anode and cathode electrodes having an annular space therebetween, magnetic field means for applying a substantially axial magnetic field to the interelectrode space and a gas within the interelectrode space so that, during conduction of the crossed-field switch device, current can pass between said electrodes in the glow discharge mode, the improvement comprising: a plasma injector positioned adjacent said electrodes for injecting plasma into the interelectrode space and resonant means connected to said elecTrode so that the injection of plasma into the interelectrode space causes interelectrode metallic arc discharge to reduce the potential between said electrodes and said resonance means induces a current zero to extinguish the metallic arc mode discharge and permit initiation of glow mode discharge.
Claim 4
Independent Claim
151 words
An apparatus for ignition of a crossed-field switching device to turn on the crossed-field switching device when a high potential is applied to the crossed-field switching device, said crossed-field switching device comprising: concentric anode and cathode electrodes having an annular space therebetween, magnetic field means for applying a substantially axial magnetic field to the interelectrode space and a gas within the interelectrode space so that, during conduction of the crossed-field switch device, current can pass between said electrodes in the glow discharge mode, the improvement comprising: a plasma injector positioned adjacent said electrodes for injecting plasma into the interelectrode space and resonant means connected to said elecTrode so that the injection of plasma into the interelectrode space causes interelectrode metallic arc discharge to reduce the potential between said electrodes and said resonance means induces a current zero to extinguish the metallic arc mode discharge and permit initiation of glow mode discharge.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 wherein said switching device is part of a circuit breaker which is connected between an electric current generator and a load.
Claim 6
Dependent Claim
24 words
The apparatus of claim 2 wherein said resonant means is a serially connected capacitor and inductor connected in parallel to said crossed-field switching device.
Claim 7
Dependent Claim
24 words
The apparatus of claim 1 wherein said resonant means is a serially connected capacitor and inductor connected in parallel to said crossed-field switching device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |