US4777555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for protecting an electric power line against high transient overvoltages
Assignee: Alcatel CIT SA
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Filing: 1987-07-10
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Granted: 1988-10-11
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Expires: 2007-07-10
Abstract
Abstract A device for protecting a polyphase electric power line against high transient overvoltages comprises at least two stages in series, the first stage being provided with a spark-gap and a decoupling inductor and being followed by a stage having a bridge limiter including two oppositely-biased power diodes each connected in series with a high-value capacitor, a time-delay contactor being placed at the terminals of each power-diode/capacitor assembly so as to permit charging of the capacitors through a resistor and auxiliary diodes and then to permit cut-off of the bridge limiter. The protection device has only one pair of high-value capacitors each connected in common in series with one of the power diodes of each phase, an auxiliary diode being associated with each capacitor.
Inventors
- 👤 Michel Esculpavit
- 👤 Christian Girard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
232 words
A device for protecting a polyphase electric power line against high transient overvoltages of electromagnetic origin, comprising at least a first stage and a second stage following said first stage and connected in series therewith, the first stage being provided with a spark-gap and an inductor for providing voltage transient decoupling with respect to the second stage and said second stage having a bridge limiter including: at least first and second high-value capacitors, at least first and second oppositely-biased power diodes for each of plural phases, each of said diodes being connected in series with a respective high-value capacitor via a respective connection point to form a pair of power diode/capacitor assemblies, a resistor, a pair of auxiliary diodes each coupled between said resistor and a respective one of said connection points, and a time-delay contactor coupled to said resistor and to at least one terminal of each power diode/capacitor assembly so as to first permit charging of the capacitors through said resistor and auxiliary diodes, and then permit cut-off of the bridge limiter once the capacitors have been charged, wherein said first high-value capacitor is connected in common in series with the first power diodes of each of said plural phases and said second high-value capacitor is connected in series in common with the second power diodes of each of said plural phases, an auxiliary diode being associated with each capacitor.
Claim 2
Independent Claim
232 words
A device for protecting a polyphase electric power line against high transient overvoltages of electromagnetic origin, comprising at least a first stage and a second stage following said first stage and connected in series therewith, the first stage being provided with a spark-gap and an inductor for providing voltage transient decoupling with respect to the second stage and said second stage having a bridge limiter including: at least first and second high-value capacitors, at least first and second oppositely-biased power diodes for each of plural phases, each of said diodes being connected in series with a respective high-value capacitor via a respective connection point to form a pair of power diode/capacitor assemblies, a resistor, a pair of auxiliary diodes each coupled between said resistor and a respective one of said connection points, and a time-delay contactor coupled to said resistor and to at least one terminal of each power diode/capacitor assembly so as to first permit charging of the capacitors through said resistor and auxiliary diodes, and then permit cut-off of the bridge limiter once the capacitors have been charged, wherein said first high-value capacitor is connected in common in series with the first power diodes of each of said plural phases and said second high-value capacitor is connected in series in common with the second power diodes of each of said plural phases, an auxiliary diode being associated with each capacitor.
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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |