Patent US3586909A successfully refreshed from Google Patents.
US3586909A
Expired / Lapsed
US
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Protecting means for series capacitors in high voltage electrical conductors
Assignee: ABB Norden Holding AB
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Filing: 1969-04-28
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Granted: 1971-06-22
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Expires: 1989-04-28
Abstract
Abstract For protecting series capacitors in high voltage electrical conductors, two circuits are provided in parallel with the capacitor, each containing a spark gap and a switch. A third switch constituted by a breaker can short circuit the capacitor. A control device is provided which, when one of the spark gaps ignites, closes the breaker, and thereafter opens the switch in the circuit of the ignited spark gap. When the fault ceases, the breaker opens and, shortly thereafter, the opened switch is reclosed.
Inventors
- 👤 Thor Erik Thorsteinsen
- 👤 Valter Larsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:28
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
Means for protecting series capacitors in high voltage electrical conductors, comprising at least two circuits, each comprising a series connection of a spark gap 5,6 and a switching device 7, 8 connected in parallel with the capacitor 2, a further switching device 3 to short circuit the capacitor and a control device 4 responsive to the current through either of said circuits to control the switching devices 3, 7, 8, said control device including means responsive to current flow in one of said circuits to close said further switching device and to open the switChing device in said circuit, and means responsive to excess flow of current through said further switching device to hold said further switching device closed as long as the current there through exceeds a predetermined excess over the normal current.
Claim 2
Dependent Claim
134 words
Means for protecting series capacitors in high voltage electrical conductors, comprising at least two circuits, each comprising a series connection of a spark gap 5,6 and a switching device 7, 8 connected in parallel with the capacitor 2, a further switching device 3 to short circuit the capacitor and a control device 4 responsive to the current through either of said circuits to control the switching devices 3, 7, 8, said control device including means responsive to current flow in one of said circuits to close said further switching device and to open the switChing device in said circuit, and means responsive to excess flow of current through said further switching device to hold said further switching device closed as long as the current there through exceeds a predetermined excess over the normal current.
Claim 3
Dependent Claim
30 words
Means according to claim 1, in which each of the two circuits contains a current transformer 9, 10, the secondary winding of which is connected to the control device 4.
Claim 4
Dependent Claim
25 words
Means according to claim 1, in which a current transformer 12 is connected in a conductor which is common for both the spark gap circuits
Claim 5
Dependent Claim
25 words
Means according to claim 3, in which one of the spark gaps 5 has a slightly narrower sparking path so that it always ignites first.
Claim 6
Dependent Claim
24 words
Means according to claim 1, in which the switching device for the spark gap circuits is a two-position switch 13 common to both circuits.
Claim 7
Dependent Claim
116 words
Means for protecting series capacitors in high voltage electrical conductors, comprising at least two circuits, each circuit comprising a series connection of a spark gap 5, 6 and a switching device 7, 8, connected in parallel with the capacitor 2, a control device 4 responsive to the current through said circuits to control the two switching devices, said control device including means responsive to current flow in one of said circuits to hold one of said switching devices open as long as the current through the capacitor is below a predetermined value and to hold both switching devices closed as long as the current through the switching devices exceeds as predetermined excess over the normal current.
Claim 8
Dependent Claim
116 words
Means for protecting series capacitors in high voltage electrical conductors, comprising at least two circuits, each circuit comprising a series connection of a spark gap 5, 6 and a switching device 7, 8, connected in parallel with the capacitor 2, a control device 4 responsive to the current through said circuits to control the two switching devices, said control device including means responsive to current flow in one of said circuits to hold one of said switching devices open as long as the current through the capacitor is below a predetermined value and to hold both switching devices closed as long as the current through the switching devices exceeds as predetermined excess over the normal current.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |