US4096431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disconnecting thyristors from thyristor controlled reactance
Assignee: ABB Norden Holding AB
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Filing: 1977-03-21
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Granted: 1978-06-20
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Expires: 1997-03-21
Abstract
Abstract Apparatus for phase compensation of AC networks includes a transformer and at least one reactance element and a control device such as a thyristor to control the reactive power consumed by the reactance element. The control device is connected to reactance element and to the transformer so that the control device can be switched out of the circuit leaving the reactance element still connected to the AC network through the transformer.
Inventors
- 👤 Bertil Hammarlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:19
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1835; H02J3/1864; Y; Y02; Y02E; Y02E40/00; Y02E40/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
Apparatus for phase compensation in an AC network including reactance means and thyristor control means coupled to said network by transformer means in which the improvement comprises switching means coupling said thyristor control means, said reactance means and said transformer means for disconnecting said thyristor control means from said reactance means and said transformer means and leaving said reactance means connected in circuit with said transformer means.
Claim 2
Dependent Claim
67 words
Apparatus for phase compensation in an AC network including reactance means and thyristor control means coupled to said network by transformer means in which the improvement comprises switching means coupling said thyristor control means, said reactance means and said transformer means for disconnecting said thyristor control means from said reactance means and said transformer means and leaving said reactance means connected in circuit with said transformer means.
Claim 3
Dependent Claim
33 words
The apparatus of claim 1 in which said transformer means has a grounded neutral point with said switching means connecting said thyristor control means between said grounded neutral point and said reactance means.
Claim 4
Dependent Claim
57 words
The apparatus of claim 1 which said reactance means comprises a pair of reactance groups, each reactance group coupled to a different transformer of said transformer means and a thyristor control element and coupled to said network through said transformers,each of said transformers phase displaced relative to the other whereby the apparatus has an increased pulse number.
Claim 5
Dependent Claim
20 words
The apparatus of claim 3 wherein one transformer is a Y/D/Y transformer and said other transformer is a Y/Z transformer.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |