US4204101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid circuit breaker with varistor in parallel with vacuum interrupter
Assignee: ABB Inc USA
•
Filing: 1977-06-22
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Granted: 1980-05-20
•
Expires: 1997-06-22
Abstract
Abstract A hybrid circuit breaker consisting of a vacuum interrupter connected in series with an SF 6 interrupter has a zinc oxide varistor connected in parallel with the vacuum interrupter. The capacitance to ground of the SF 6 interrupter is higher than the capacitance to ground of the vacuum interrupter.
Inventors
- 👤 Rolf Dethlefsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/59; H01H33/60; H01H33/66; H01H33/666; H01H33/6661
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A hybrid circuit interrupter comprising a vacuum circuit interrupter, an electronegative gas circuit interrupter connected in series with said vacuum interrupter, an operating mechanism for simultaneously opening said vacuum circuit interrupter and electronegative gas circuit interrupter, and a varistor connected in parallel with said vacuum interrupter.
Claim 2
Dependent Claim
46 words
A hybrid circuit interrupter comprising a vacuum circuit interrupter, an electronegative gas circuit interrupter connected in series with said vacuum interrupter, an operating mechanism for simultaneously opening said vacuum circuit interrupter and electronegative gas circuit interrupter, and a varistor connected in parallel with said vacuum interrupter.
Claim 3
Dependent Claim
17 words
The hybrid interrupter of claim 1 wherein said electronegative gas circuit interrupter is an SF 6 interrupter.
Claim 4
Dependent Claim
14 words
The hybrid interrupter of claim 1 wherein said varistor is a zinc oxide varistor.
Claim 5
Dependent Claim
34 words
The hybrid interrupter of claim 1 wherein said vacuum interrupter produces high frequency oscillations when the voltage thereacross exceeds a given value; said varistor becoming conductive at a voltage lower than said given value.
Claim 6
Dependent Claim
37 words
The hybrid interrupter of claim 4 wherein said electronegative gas interrupter has a recovery voltage characteristic which enables it to withstand the voltage across said series-connected interrupters by the time said given value of voltage is reached.
Claim 7
Dependent Claim
17 words
The hybrid interrupter of claim 5 wherein said electronegative gas circuit interrupter is an SF 6 interrupter.
Claim 8
Dependent Claim
14 words
The hybrid interrupter of claim 6 wherein said varistor is a zinc oxide varistor.
Claim 9
Dependent Claim
28 words
The hybrid interrupter of claim 1 wherein the capacitance of said vacuum interrupter to a ground is less than the capacitance of said electronegative gas interrupter to ground.
Claim 10
Dependent Claim
30 words
The hybrid interrupter of claim 8 wherein said vacuum interrupter is mounted on said electronegative gas interrupter and is farther removed from a grounded support than said electronegative gas interrupter.
Claim 11
Dependent Claim
28 words
The hybrid interrupter of claim 5 wherein the capacitance of said vacuum interrupter to a ground is less than the capacitance of said electronegative gas interrupter to ground.
Claim 12
Dependent Claim
30 words
The hybrid interrupter of claim 10 wherein said vacuum interrupter is mounted on said electronegative gas interrupter and is farther removed from a grounded support than said electronegative gas interrupter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-20 | 1983-11-19 | 1984-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-20 | 1987-11-19 | 1988-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-20 | 1991-11-19 | 1992-05-20 | $7700.00 | Window Closed / Lapsed |