US3612897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for tapping the dc link of a high-voltage direct current transmission system
Assignee: BBC Brown Boveri AG Germany
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Filing: 1969-12-01
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Granted: 1971-10-12
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Expires: 1989-12-01
Abstract
Abstract An arrangement for tapping the DC link of a high-voltage directcurrent transmission system which comprises at least two seriesconnected auxiliary converters and power transformer means, wherein each auxiliary converter is controlled by a grid control unit. The grid control units are either controlled by the outputs of an AC-voltage controller and a DC-voltage controller or by the output of the DC-voltage controller only. The output of the ACvoltage controller is simultaneously applied to the input terminals of the grid control units and the output of the DCvoltage controller is successively applied to the input terminals of the grid control units by means of a controlled connector switch.
Inventors
- 👤 Karl-Werner Kanngiesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:47
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/36; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
124 words
An arrangement for tapping the direct-current link of a highvoltage direct-current transmission system comprising at least two series-connected auxiliary converters of the controllable electric valve type arranged between two tapping points on the direct-current link, the alternating current output terminals of said auxiliary converters being connected with power transformer means, a grid control unit individual to each auxiliary converter unit, each of said grid control units being controlled by the outputs of an alternating-current voltage controller and a direct-current voltage controller, the output of said alternating-current voltage controller being applied simultaneously to the input terminals of all of said grid control units and control switch means applying the output of said direct-current voltage controller successively to the input terminals of said grid control units.
Claim 2
Dependent Claim
124 words
An arrangement for tapping the direct-current link of a highvoltage direct-current transmission system comprising at least two series-connected auxiliary converters of the controllable electric valve type arranged between two tapping points on the direct-current link, the alternating current output terminals of said auxiliary converters being connected with power transformer means, a grid control unit individual to each auxiliary converter unit, each of said grid control units being controlled by the outputs of an alternating-current voltage controller and a direct-current voltage controller, the output of said alternating-current voltage controller being applied simultaneously to the input terminals of all of said grid control units and control switch means applying the output of said direct-current voltage controller successively to the input terminals of said grid control units.
Claim 3
Dependent Claim
77 words
An arrangement according to claim 1 wherein said power transformer means are formed by a unitary power transformer having one primary winding and a plurality of secondary windings, each said secondary winding being connected with one of the alternating current output terminals of said auxiliary converters whereby a main insulation for the full direct-current voltage is provided for the secondary windings and the mutual insulation between the secondary windings is provided for a relatively small direct-current voltage.
Claim 4
Dependent Claim
52 words
An arrangement according to claim 2 and which further includes a unitary high-voltage bushing insulator provided with a plurality of intermediate-voltage bushings corresponding respectively to said plurality of auxiliary converters and through which the alternating-current output terminals of said auxiliary converters lead respectively to said secondary windings of said unitary power transformer.
Claim 5
Dependent Claim
39 words
An arrangement according to claim 1 and wherein release diodes are provided for applying the output of said alternating-curre nt voltage controller and the output of said direct-current voltage controller to the input terminals of said grid control units.
Claim 6
Dependent Claim
117 words
An arrangement as defined in claim 1 wherein said direct-current voltage controller is of the dual input type, one of said inputs being connected to a direct-current voltage transformer arranged between said tapping points on said direct-current link, and the other of said inputs being constituted by the output of a dual-input comparison device which compares the frequency of the alternating current voltage with the direct current flowing in said link to produce a nominal direct-current voltage output, the output of said direct-current voltage controller being applied through the contacts of said control switch means successively to said grid control units, and said control switch means being actuated by the direct-current voltage output from said comparison device.
Claim 7
Dependent Claim
43 words
An arrangement as defined in claim 5 and which includes a frequency measuring device connected with the primary side of said power transformer means, the output of said frequency measuring device being connected to one of the inputs of said dual-input comparison device.
Claim 8
Dependent Claim
85 words
An arrangement for tapping the direct-current link of a high-voltage direct-current transmission system comprising at least two series-connected auxiliary converters of the controllable electric valve type arranged between two tapping points on the direct-current link, the alternating-current output terminals of said auxiliary converters being connected to power transformer means, a grid control unit individual to each auxiliary converter unit, a direct-current voltage conTroller, and control switch means applying the output of said direct-current voltage controller successively to the input terminals of said grid control units.
Claim 9
Dependent Claim
85 words
An arrangement for tapping the direct-current link of a high-voltage direct-current transmission system comprising at least two series-connected auxiliary converters of the controllable electric valve type arranged between two tapping points on the direct-current link, the alternating-current output terminals of said auxiliary converters being connected to power transformer means, a grid control unit individual to each auxiliary converter unit, a direct-current voltage conTroller, and control switch means applying the output of said direct-current voltage controller successively to the input terminals of said grid control units.
Claim 10
Dependent Claim
76 words
An arrangement according to claim 7 wherein said power transformer means are formed by a unitary power transformer having one primary winding and a plurality of secondary windings, each said secondary winding being connected with one of the alternating-current output terminals of said auxiliary converters whereby a main insulation for the full direct-current voltage is provided for the secondary windings and the mutual insulation between the secondary windings is provided for a relatively small direct-current voltage.
Claim 11
Dependent Claim
52 words
An arrangement according to claim 8 and which further includes a unitary high-voltage bushing insulator provided with a plurality of intermediate-voltage bushings corresponding respectively to said plurality of auxiliary converters and through which the alternating-current output terminals of said auxiliary converters lead respectively to said secondary windings of said unitary power transformer.
Claim 12
Dependent Claim
115 words
An arrangement as defined in claim 7 wherein said direct-current voltage controller is of the dual-input type, one of said inputs being connected to a direct-current voltage transformer arranged between said tapping points on said direct-current link, and the other of said inputs being constituted by the output of a dual-input comparison device which compares with frequency of the alternating-current voltage with the direct current flowing in said link to produce a nominal direct-current voltage output; the output of said direct-current voltage controller being applied through the contacts of said control switch means successively to said grid control units, and said control switch means being actuated by the direct-current voltage output from said comparison device.
Claim 13
Dependent Claim
43 words
An arrangement as defined in claim 10 and which includes a frequency measuring device connected with the primary side of said power transformer means, the output of said frequency measuring device being connected to one of the imputs of said dual-input comparison device.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |