US3758790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for the current limiting interruption of current
Assignee: Individual
•
Filing: 1972-07-21
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Granted: 1973-09-11
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Expires: 1992-07-21
Abstract
Abstract A circuit arrangement for current limiting interruption of currents at high voltages in a network includes a current limiting circuit having a commutation switch and a residual current switch connected in series to a nodal point of the network. An energy dissipating resistor is connected in parallel with the commutation switch. A commutation capacitive circuit, which includes a capacitor, is connected across the commutation switch. The capacitor is of such size that the current to be interrupted is forced, after the capacitor becomes charged, to commutate to the parallel connected resistor. The current magnitude is thus reduced to a residual current which can be interrupted by the residual current switch. A plurality of separating switches are separately connected between the nodal point and respective main lines. A plurality of auxiliary switches are separately connected from each of the main lines via the commutating switch and the residual current switch to the nodal point. In order to interrupt the current flow in any of the main lines, the auxiliary switch associated with the selected main line is closed and thereafter its associated separating switch, the commutation switch and the residual current switch opened in succession in the order named.
Inventors
- 👤 D Kind
- 👤 H Hartel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:48
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/22; H02H7/222; H01; H01H; H01H9/00; H01H9/54
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
235 words
In a circuit arrangement for the current limiting interruption of currents at high voltages in a network, the arrangement including a current limiting circuit having commutation switch means and residual current switch means connected in series with one another to a nodal point of said network, energy dissipating resistive circuit means connected in parallel with said commutation switch means and commutation capacitive circuit means coupled across said commutation switch means, the capacitive circuit means having capacitance of such size that the current to be interrupted is forced, after said capacitance becomes charged, to commutate to the parallel connected energy dissipating resistive circuit means so that the current magnitude is reduced to a residual current which may be interrupted by said residual current switch means, the improvement comprising a plurality of separating switch means separately connected between said nodal point and respective main lines, and a plurality of auxiliary switch means separately connected from each respective one of said main lines via the series connected said commutation switch means and said residual current switch means to said nodal point, whereby any one of said plurality of auxiliary switch means may be closed and thereafter the associated separating switch means of said plurality of separating switch means, said commutation switch means and said residual current switch means opened in succession in the denominated order to interrupt the current flow in any selected one of said main lines.
Claim 2
Dependent Claim
235 words
In a circuit arrangement for the current limiting interruption of currents at high voltages in a network, the arrangement including a current limiting circuit having commutation switch means and residual current switch means connected in series with one another to a nodal point of said network, energy dissipating resistive circuit means connected in parallel with said commutation switch means and commutation capacitive circuit means coupled across said commutation switch means, the capacitive circuit means having capacitance of such size that the current to be interrupted is forced, after said capacitance becomes charged, to commutate to the parallel connected energy dissipating resistive circuit means so that the current magnitude is reduced to a residual current which may be interrupted by said residual current switch means, the improvement comprising a plurality of separating switch means separately connected between said nodal point and respective main lines, and a plurality of auxiliary switch means separately connected from each respective one of said main lines via the series connected said commutation switch means and said residual current switch means to said nodal point, whereby any one of said plurality of auxiliary switch means may be closed and thereafter the associated separating switch means of said plurality of separating switch means, said commutation switch means and said residual current switch means opened in succession in the denominated order to interrupt the current flow in any selected one of said main lines.
Claim 3
Dependent Claim
38 words
A circuit arrangement as defined in claim 1 wherein said current limiting circuit further comprises an excess voltage protection circuit means coupled in parallel with the series connected said commutation switch means and said residual current switch means.
Claim 4
Dependent Claim
14 words
energy dissipating resistive circuit means coupled in parallel with said commutation switch means, and
Claim 5
Dependent Claim
14 words
energy dissipating resistive circuit means coupled in parallel with said commutation switch means, and
Claim 6
Dependent Claim
26 words
A circuit arrangement as defined in claim 2 wherein said excess voltage protection circuit means comprises a capacitor, and a spark path means connected in series.
Claim 7
Dependent Claim
54 words
commutation capacitance circuit means coupled in parallel with said commutation switch means; whereby current flowing between said main line and said circuit point may be interrupted by closing said auxiliary switch means and thereafter opening said separating switch means, said commutation switch means and said residual switch means in succession in the demoninated order.
Claim 8
Dependent Claim
54 words
commutation capacitance circuit means coupled in parallel with said commutation switch means; whereby current flowing between said main line and said circuit point may be interrupted by closing said auxiliary switch means and thereafter opening said separating switch means, said commutation switch means and said residual switch means in succession in the demoninated order.
Claim 9
Dependent Claim
22 words
excess voltage protection circuit means coupled in parallel with the series coupled said commutation switch means and said residual current switch means.
Claim 10
Dependent Claim
22 words
excess voltage protection circuit means coupled in parallel with the series coupled said commutation switch means and said residual current switch means.
Claim 11
Dependent Claim
61 words
A circuit arrangement as defined in claim 3 wherein said capacitor of said excess voltage protection circuit means is a part of said commutation capacitive circuit means and constitutes the capacitance thereof and further comprising a spark path means connected in parallel with said capacitor for discharging said capacitor subsequent to its charging and the opening of said commutation switch means.
Claim 12
Dependent Claim
62 words
A circuit arrangement for the current limiting interruption of current at high voltage flowing in a main line comprising, in combination: a. normally closed separating switch means connected between said main line and a circuit point; and b. normally open auxiliary switch means and current limiting circuit means connected in parallel with said sEparating switch means, said current limiting circuit means including:
Claim 13
Dependent Claim
62 words
A circuit arrangement for the current limiting interruption of current at high voltage flowing in a main line comprising, in combination: a. normally closed separating switch means connected between said main line and a circuit point; and b. normally open auxiliary switch means and current limiting circuit means connected in parallel with said sEparating switch means, said current limiting circuit means including:
Claim 14
Dependent Claim
16 words
A circuit arrangement as defined in claim 5 wherein said current limiting circuit means further includes:
Claim 15
Dependent Claim
61 words
A circuit arrangement as defined in claim 6 wherein said excess voltage protection circuit means includes first spark path means and a capacitor, said capacitor forming the capacitance of said commutation capacitance circuit means, and further comprising additional spark path means connected across said capacitor for discharging said capacitor subsequent to its charging and the opening of said commutation switch means.
Claim 16
Dependent Claim
75 words
A circuit arrangement as defined in claim 5 further comprising additional main lines connected to said circuit point, respective additional separate normally closed separating switch means connected between said circuit point and respective ones of said additional main lines, and respective additional separate normally open switch means connected between respective ones of said additional main lines and said current limiting circuit means, whereby the current flowing in any of the main lines may be interrupted.
References Cited (Backward Citations)
FR681210A
Cited
US3330992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |