Patent US4254402A successfully refreshed from Google Patents.
US4254402A
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Transformer arrangement for coupling a communication signal to a three-phase power line
Assignee: Boeing North American Inc
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Filing: 1979-08-17
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Granted: 1981-03-03
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Expires: 1999-08-17
Abstract
Abstract A communication signal is coupled simultaneously to all three phases of a three-phase power line through a three-phase open delta transformer with the communication signal being applied across the low voltage pair of windings.
Inventors
- 👤 William C. Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:22
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/56; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5416; H04B2203/5429; H04B2203/5458; H04B2203/5462; H04B2203/5466; H04B2203/5483
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A transformer arrangement for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line: a pair of low voltage windings serially connected across which the signal is applied, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the voltage produced across the uncommon leads of said high voltage windings as a result of the signal applied to said serially connected low voltage windings is zero.
Claim 2
Dependent Claim
125 words
A transformer arrangement for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line: a pair of low voltage windings serially connected across which the signal is applied, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the voltage produced across the uncommon leads of said high voltage windings as a result of the signal applied to said serially connected low voltage windings is zero.
Claim 3
Dependent Claim
130 words
Signaling apparatus for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: an AC signal device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the voltage produced across the uncommon leads of said high voltage windings as a result of the signal applied to said serially connected low voltage windings by said signal device is zero.
Claim 4
Dependent Claim
130 words
Signaling apparatus for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: an AC signal device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the voltage produced across the uncommon leads of said high voltage windings as a result of the signal applied to said serially connected low voltage windings by said signal device is zero.
Claim 5
Dependent Claim
124 words
A signaling system, comprising: a three-phase power line comprising three phase conductors; an AC signaling device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the voltage produced across the uncommon leads of said high voltage windings as a result of the signal applied to said serially connected low voltage windings by said signaling device is zero.
Claim 6
Dependent Claim
124 words
A signaling system, comprising: a three-phase power line comprising three phase conductors; an AC signaling device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the voltage produced across the uncommon leads of said high voltage windings as a result of the signal applied to said serially connected low voltage windings by said signaling device is zero.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |