US3943435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer having improved voltage and phase characteristics
Assignee: Ericsson Inc
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Filing: 1974-08-12
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Granted: 1976-03-09
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Expires: 1994-08-12
Abstract
Abstract A coupling capacitor voltage transformer or potential transformer has its secondary winding tapped to provide a predetermined voltage across a portion of the secondary winding. The transformer is improved by an inductive reactance added in series with the secondary tap. The magnitude of the added inductive reactance is selected so that the sum of the added reactance and the leakage reactance between the transformer primary winding and the portion of the secondary winding referred to the primary is equal to the leakage reactance between the primary winding and the full secondary winding referred to the primary. Under this equality condition, the phase relation between the primary and secondary voltages will be the same for a standard type burden or equivalent burdens connected either across the portion of the secondary winding or across the full secondary winding. The added inductive reactance may also be used with a separate secondary winding having a lower referred leakage reactance to provide a phase relation for that secondary winding that is the same as the phase relation for the secondary winding having a higher referred leakage reactance.
Inventors
- 👤 Malcolm B. DeJarnette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/24; G; G01; G01R; G01R15/00; G01R15/04; G01R15/06; G01R19/00; G01R19/0084; G01R29/00; G01R29/18; H01F27/00; H01F27/42; H01F29/00; H01F29/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
For use with a coupling capacitor voltage transformer, a potential transformer, or the like having a primary winding adapted to be connected to a source of alternating electrical voltage, and a secondary winding structure coupled to said primary winding, said secondary winding structure having a relatively high leakage reactance portion and a relatively low leakage reactance portion; an improved arrangement comprising: an inductor adapted to be connected to the low leakage reactance voltage portion, said inductor having a magnitude such that the leakage reactance of the high leakage reactance voltage portion referred to the primary winding is substantially the same as the leakage reactance of the low leakage reactance voltage portion referred to the primary winding.
Claim 2
Dependent Claim
116 words
For use with a coupling capacitor voltage transformer, a potential transformer, or the like having a primary winding adapted to be connected to a source of alternating electrical voltage, and a secondary winding structure coupled to said primary winding, said secondary winding structure having a relatively high leakage reactance portion and a relatively low leakage reactance portion; an improved arrangement comprising: an inductor adapted to be connected to the low leakage reactance voltage portion, said inductor having a magnitude such that the leakage reactance of the high leakage reactance voltage portion referred to the primary winding is substantially the same as the leakage reactance of the low leakage reactance voltage portion referred to the primary winding.
Claim 3
Dependent Claim
83 words
A coupling capacitor voltage transformer, comprising: a. a primary winding; b. at least one secondary winding coupled to said primary winding, said secondary winding having a tap connected thereto that provides an available portion of said secondary winding; c. and an inductor connected to said secondary winding tap, said inductor having a magnitude such that it provides the difference in leakage reactance referred to said primary winding provided by all of said secondary winding and provided by said portion of said secondary winding.
Claim 4
Dependent Claim
83 words
A coupling capacitor voltage transformer, comprising: a. a primary winding; b. at least one secondary winding coupled to said primary winding, said secondary winding having a tap connected thereto that provides an available portion of said secondary winding; c. and an inductor connected to said secondary winding tap, said inductor having a magnitude such that it provides the difference in leakage reactance referred to said primary winding provided by all of said secondary winding and provided by said portion of said secondary winding.
Claim 5
Dependent Claim
131 words
A coupling capacitor voltage transformer comprising: a. a primary winding; b. a first secondary winding coupled to said primary winding and having a leakage reactance between said transformer primary winding and said first secondary winding referred to said primary winding that is relatively high; c. a second secondary winding coupled to said primary winding and having a leakage reactance between said transformer primary winding and said second secondary winding referred to the primary winding that is relatively low; d. and an inductor connected to said second secondary winding, said inductor having a magnitude such that the sum of its reactance and the leakage reactance of said second secondary winding referred to said primary winding is substantially equal to the leakage reactance of said first secondary winding referred to said primary winding.
Claim 6
Dependent Claim
131 words
A coupling capacitor voltage transformer comprising: a. a primary winding; b. a first secondary winding coupled to said primary winding and having a leakage reactance between said transformer primary winding and said first secondary winding referred to said primary winding that is relatively high; c. a second secondary winding coupled to said primary winding and having a leakage reactance between said transformer primary winding and said second secondary winding referred to the primary winding that is relatively low; d. and an inductor connected to said second secondary winding, said inductor having a magnitude such that the sum of its reactance and the leakage reactance of said second secondary winding referred to said primary winding is substantially equal to the leakage reactance of said first secondary winding referred to said primary winding.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |