US3671901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-harmonic transformer
Assignee: Individual
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Filing: 1971-01-18
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Granted: 1972-06-20
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Expires: 1991-01-18
Abstract
Abstract Devices for eliminating in a three-phase voltage transformer T, separating two networks A and B the voltage harmonics preexisting within the three phase voltage feeding A and detrimental to B, or the current harmonics generated by B and detrimental to A. The devices include single phase transformers, the primary windings of which are ''''delta'''' coupled and the secondary windings of which are ''''star'''' coupled, the angles determined by the legs of the triangles and of the stars exhibiting unique values, together with single phase autotransformers for connection to the A and B networks. When eliminating only current harmonics, T need only be constituted of two single phase transformers the primary secondary windings of which are in quadrature together with single phase transformers, the windings of which are connected to specific current taps provided on the above-mentioned transformers. They can be used in installations for electrochemistry, electrometallurgy, power distribution of d.c. current and for installations of static power conversion.
Inventors
- 👤 Jacques Francois Marie-Jos Lys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:48
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/34; H01F27/38; H01F27/385
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
242 words
Apparatus for eliminating harmonics comprising a transformer coupling a first network to a second network, said transformer comprising two single phase transformers including respective primary windings connected in quadrature and respective secondary windings connected in quadrature, said primary windings being electrically connected together by connecting one end of one of said primary windings to a tap point on the other of said respective primary winding, said secondary windings each being electrically connected to a tap point on the other of said respective secondary windings, said tap points being located at the midpoints of said other of said respective primary and secondary windings, said primary windings having square root 3/2 times the number of turns of said respective secondary windings, said primary and secondary windings being provided with intermediary taps designated Ai and Bi on said primary windings and ai and bi on said secondary windings, the subscript i representing the odd harmonic to be eliminated, the positions of said taps being defined as: wherein k is a whole number or null and the designated geometrical segments represent the number of associated winding turns and H and h are the midpoint taps of said respective primary and secondary windings; and two further single phase transformers including primary and secondary windings and having a transformation ratio Beta , the primary windings and secondary windings of said two further single phase transformers being arranged across the taps Ai and Bi, and ai and bi respectively.
Claim 2
Dependent Claim
242 words
Apparatus for eliminating harmonics comprising a transformer coupling a first network to a second network, said transformer comprising two single phase transformers including respective primary windings connected in quadrature and respective secondary windings connected in quadrature, said primary windings being electrically connected together by connecting one end of one of said primary windings to a tap point on the other of said respective primary winding, said secondary windings each being electrically connected to a tap point on the other of said respective secondary windings, said tap points being located at the midpoints of said other of said respective primary and secondary windings, said primary windings having square root 3/2 times the number of turns of said respective secondary windings, said primary and secondary windings being provided with intermediary taps designated Ai and Bi on said primary windings and ai and bi on said secondary windings, the subscript i representing the odd harmonic to be eliminated, the positions of said taps being defined as: wherein k is a whole number or null and the designated geometrical segments represent the number of associated winding turns and H and h are the midpoint taps of said respective primary and secondary windings; and two further single phase transformers including primary and secondary windings and having a transformation ratio Beta , the primary windings and secondary windings of said two further single phase transformers being arranged across the taps Ai and Bi, and ai and bi respectively.
Claim 3
Dependent Claim
194 words
Apparatus according to claim 1 wherein said apparatus comprises a three phase transformer having a transformation ratio Beta comprising two single phase transformers electrically coupled together, the respective primary windings of said single phase transformers being electrically connected together by connecting one end of said primary of one of said single phase transformers to the midpoint of the other primary, said midpoint being designated as H, the respective secondary windings of said single phase transformers being electrically coupled together by connecting one end of the secondary of the other of said single phase transformers to the midpoint of the secondary of said one of said single phase transformers, said latter midpoint being designated h, N1 and n1 designating the number of winding turns of the primary and secondary windings of said one of said single phase transformers and N2 and n2 the number of winding turns of the primary and secondary windings of said other of said single phase transformers, the transformation ratios Beta 1 and Beta 2 of said single phase transformers being: the primary and secondary windings of at least one of said further single phase transformers having a transformation ration of
Claim 4
Dependent Claim
32 words
Apparatus according to claim 1 wherein the parameter k is null and the subscript i is equal to half the sequence sum of the two following harmonics which are to be eliminated.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 2 wherein the parameter k is null and the subscript i is equal to half the sequence sum of the two following harmonics to be eliminated.
Claim 6
Dependent Claim
158 words
Apparatus for eliminating harmonics comprising (a) first and second autotransformers respectively designated AH and BC, said autotransformers being electrically connected together with a connection of one end of autotransformer AH to the midpoint H of the second autotransformer BC, a current tap Ai on said autotransformer AH, a pair of current taps Bi and Ci on said autotraNsformer BC, (b) three single phase transformers including primary windings designated AiBi, BiCi, and CiAi , current taps Ai, Bi, Ci being coupled in accordance with the following relationship: wherein k is a whole number or null and in which the designated geometrical segments represent the number of turns of the associated winding sections, the secondary windings of said single phase transformer being designated aibi, bici and ciai and respectively conforming to the following relationship: and being coupled in a star configuration, (c) a further single phase autotransformer aici including intermediary current taps b and c for connecting the second network.
Claim 7
Dependent Claim
158 words
Apparatus for eliminating harmonics comprising (a) first and second autotransformers respectively designated AH and BC, said autotransformers being electrically connected together with a connection of one end of autotransformer AH to the midpoint H of the second autotransformer BC, a current tap Ai on said autotransformer AH, a pair of current taps Bi and Ci on said autotraNsformer BC, (b) three single phase transformers including primary windings designated AiBi, BiCi, and CiAi , current taps Ai, Bi, Ci being coupled in accordance with the following relationship: wherein k is a whole number or null and in which the designated geometrical segments represent the number of turns of the associated winding sections, the secondary windings of said single phase transformer being designated aibi, bici and ciai and respectively conforming to the following relationship: and being coupled in a star configuration, (c) a further single phase autotransformer aici including intermediary current taps b and c for connecting the second network.
Claim 8
Dependent Claim
40 words
Apparatus for eliminating harmonics as claimed in claim 5 comprising 3n single phase transformers for eliminating n harmonics of order i, j . . . 1, said 3n single phase transformers being series connected to said three single phase autotransformers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |