US3711760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier-transformer system
Assignee: ABB Inc USA
•
Filing: 1971-06-30
•
Granted: 1973-01-16
•
Expires: 1991-06-30
Abstract
Abstract Electrical inductive apparatus for supplying polyphase power to a polyphase rectifier. Two six-phase transformers are interconnected with their primary windings in parallel circuit relationship. Tertiary windings on each transformer are interconnected and connected to a harmonic filter. Multiple secondaries furnish twelve-phase power to a rectifying unit. The secondary winding bus conductors and the secondary bushing terminals may be arranged so that adjacent conducting elements carry currents which are antiphase to reduce eddy currents and inductive heating.
Inventors
- 👤 F Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:12
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H01; H01F; H01F27/00; H01F27/34; H01F27/346; H01F27/38; H01F27/385; H02M7/068
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
304 words
Six-phase transformer apparatus comprising housing means, a magnetic core having three legs, three high-current bushings each with first and second terminals, said bushings being attached to said housing means, primary winding assemblies, first, second and third secondary winding assemblies each disposed in inductive relationship with one of said core legs, bus conductors positioned in pairs adjacent to the outside of each secondary assembly, a first bus conductor pair connected to a first phase winding of said first secondary winding assembly, a second bus conductor pair connected to a second phase winding of said first secondary winding assembly, a third bus conductor pair connected to a third phase winding of said second secondary winding assembly, a fourth bus conductor pair connected to a fourth phase winding of said second secondary winding assembly, a fifth bus conductor pair connected to a fifth phase winding of said third secondary winding assembly, a sixth bus conductor pair connected to a sixth phase winding of said third secondary winding assembly, said first, third and fifth bus conductor pairs each having one of their bus conductors connected to each other to form the neutral connection of a first three-phase wye-connected secondary, the other bus conductor of each of saiD first, third and fifth bus conductor pairs being connected to a first terminal on each of said bushings, said second, fourth and sixth bus conductor pairs each having one of their bus conductors connected to each other to form a neutral connection of a second threephase wye-connected secondary, the other bus conductor of each of said second, fourth and sixth bus conductor pairs being connected to the second terminal on each of said bushings, and means for connecting adjacent bushing terminals on the same bushing to bus conductors which conduct currents that are substantially 180* out of phase with each other.
Claim 2
Dependent Claim
304 words
Six-phase transformer apparatus comprising housing means, a magnetic core having three legs, three high-current bushings each with first and second terminals, said bushings being attached to said housing means, primary winding assemblies, first, second and third secondary winding assemblies each disposed in inductive relationship with one of said core legs, bus conductors positioned in pairs adjacent to the outside of each secondary assembly, a first bus conductor pair connected to a first phase winding of said first secondary winding assembly, a second bus conductor pair connected to a second phase winding of said first secondary winding assembly, a third bus conductor pair connected to a third phase winding of said second secondary winding assembly, a fourth bus conductor pair connected to a fourth phase winding of said second secondary winding assembly, a fifth bus conductor pair connected to a fifth phase winding of said third secondary winding assembly, a sixth bus conductor pair connected to a sixth phase winding of said third secondary winding assembly, said first, third and fifth bus conductor pairs each having one of their bus conductors connected to each other to form the neutral connection of a first three-phase wye-connected secondary, the other bus conductor of each of saiD first, third and fifth bus conductor pairs being connected to a first terminal on each of said bushings, said second, fourth and sixth bus conductor pairs each having one of their bus conductors connected to each other to form a neutral connection of a second threephase wye-connected secondary, the other bus conductor of each of said second, fourth and sixth bus conductor pairs being connected to the second terminal on each of said bushings, and means for connecting adjacent bushing terminals on the same bushing to bus conductors which conduct currents that are substantially 180* out of phase with each other.
Claim 3
Dependent Claim
43 words
The six-phase transformer apparatus of claim 1 including first, second and third tertiary winding assemblies each disposed in inductive relationship with one of the core legs, and means for selectively connecting said tertiary winding assemblies to tertiary winding assemblies of a similar transformer.
Claim 4
Dependent Claim
126 words
Twelve-phase transformer apparatus comprising first and second six-phase transformers, said first six-phase transformer comprising a delta-connected primary winding, a wye-connected tertiary winding, first and second wye-connected secondary windings, said second six-phase transformer comprising a wye-connected primary winding, a delta-connected tertiary winding, first and second wye-connected secondary windings, means for connecting the primary windings of said first and second six-phase transformers in parallel circuit relationship and to a source of electrical power, means for connecting the tertiary windings of said first and second six-phase transformers in parallel circuit relationship and to filter means, and means for connecting the secondary windings of said first and second six-phase transformers to rectifying means, said first and second six-phase transformers each being constructed according to the six-phase transformer of claim 2.
Claim 5
Dependent Claim
110 words
Twelve-phase transformer apparatus comprising first and second six-phase transformers, said first six-phase transformer comprising a delta-connected primary winding, a wye-connected tertiary winding, first and second wye-connected secondary windings, said second six phase transformer comprising a wye-connected primary winding, a delta-connected tertiary winding, first and second wye-connected secondary windings, means for connecting said primary windings of said first and second six-phase transformers in parallel circuit relationship and to a source of electrical power, means for connecting said tertiary windings of said first and second six-phase transformers in parallel circuit relationship and to filter means, and means for connecting said secondary windings of said first and second six-phase transformers to rectifying means.
Claim 6
Dependent Claim
110 words
Twelve-phase transformer apparatus comprising first and second six-phase transformers, said first six-phase transformer comprising a delta-connected primary winding, a wye-connected tertiary winding, first and second wye-connected secondary windings, said second six phase transformer comprising a wye-connected primary winding, a delta-connected tertiary winding, first and second wye-connected secondary windings, means for connecting said primary windings of said first and second six-phase transformers in parallel circuit relationship and to a source of electrical power, means for connecting said tertiary windings of said first and second six-phase transformers in parallel circuit relationship and to filter means, and means for connecting said secondary windings of said first and second six-phase transformers to rectifying means.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |