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US3670176A Expired / Lapsed US ⏱️ 0.0 years remaining

Switching arrangement for disconnecting high voltage direct current lines

Assignee: Individual
•
Filing: 1971-04-05
•
Granted: 1972-06-13
•
Expires: 1991-04-05
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Abstract

Abstract A switching arrangement for disconnecting a high voltage direct current line and commutating the line current includes a first isolator switch arranged in parallel to the commutating system and a second isolator switch arranged in series with this parallel circuit which latter is connected across the high voltage line through the second isolator switch. The commutating system includes two variable resistance branches connectible in parallel with the first isolator switch for commutating the load current, each such branch includes a controllable electric valve in series with the variable resistance, the valves are rendered conductive in alternation so that the resistance branches are likewise connected in alternation in parallel with the first isolator switch, and the values of the resistances in the respective branches are increased in steps in the time intervals during which they do not carry current. Disconnection of the line is initiated by opening the first isolator switch thus to commutate the load current to the two paralleled resistance branches, the load current is progressively reduced as a result of the stepped increases in resistance values, and lastly the second isolator switch is opened thus to complete the line disconnection.

Inventors

  • 👤 Werner Faust

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 13:18
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/59; H01H33/596

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 131 words
In a switching arrangement for disconnecting a high voltage direct current line and commutating the load current, the combination comprising a first isolator switch and a commutating system connected in a parallel circuit, a second isolator switch connected in series with said parallel circuit, said parallel circuit being connected across said high voltage line through said second isolator switch, said commutating system including two variable resistance branches, means for connecting one of said resistance branches in parallel with said first isolator switch while the other resistance branch remains disconnected, and vice versa whereby the load current flows first through one of said branches and then the other, and means for effecting stepped increases in the values of the resistances in said branches in the time intervals during which they are disconnected.
Claim 2
Dependent Claim 131 words
In a switching arrangement for disconnecting a high voltage direct current line and commutating the load current, the combination comprising a first isolator switch and a commutating system connected in a parallel circuit, a second isolator switch connected in series with said parallel circuit, said parallel circuit being connected across said high voltage line through said second isolator switch, said commutating system including two variable resistance branches, means for connecting one of said resistance branches in parallel with said first isolator switch while the other resistance branch remains disconnected, and vice versa whereby the load current flows first through one of said branches and then the other, and means for effecting stepped increases in the values of the resistances in said branches in the time intervals during which they are disconnected.
Claim 3
Dependent Claim 54 words
A switching arrangement as defined in claim 1 for disconnecting a high voltage direct current line wherein each said resistance branch is comprised of a variable resistance means, a non-controllable electric valve and a controllable electric valve connected in series, and a commutating capacitor connected between the cathode sides of the non-controllable electric valves.
Claim 4
Dependent Claim 30 words
A switching arrangement as defined in claim 2 for disconnecting a high voltage direct current line and which further includes a commutating inductance connected in series with said commutating capacitor.
Claim 5
Dependent Claim 32 words
A switching arrangement as defined in claim 2 for disconnecting a high voltage direct current line and which further includes a commutating inductance connected in series in one of said resistance branches.
Claim 6
Dependent Claim 43 words
A switching arrangement as defined in claim 2 for disconnecting a high voltage direct current line and which further includes a commutating inductance connected in series with said commutating capacitor and another commutating inductance connected in series in one of said resistance branches.
Claim 7
Dependent Claim 61 words
A switching arrangement as defined in claim 2 for disconnecting a high voltage direct current line wherein each of said resistance branches is constituted by a parallel circuit of ohmic resistors each of which is connected in series with a switching device to enable said resistors to be disconnected in sequence, and a further switching device which bridges said parallel circuit.

References Cited (Backward Citations)

US3192440A Cited
DE1490434A1 Cited
US3448287A Cited
US3534226A Cited
US3611031A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-06-13 1975-12-13 1976-06-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-06-13 1979-12-13 1980-06-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-06-13 1983-12-13 1984-06-13 $7700.00 Window Closed / Lapsed

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