US4066912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling arrangement for power line carrier systems
Assignee: Ericsson Inc
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Filing: 1976-04-21
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Granted: 1978-01-03
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Expires: 1996-04-21
Abstract
Abstract First and second bands of separate frequencies are coupled through hybrid transformers and frequency isolation filters to each of three phase wires of a power transmission line. The hybrid transformers and filters are arranged so that both bands of frequencies are transmitted and received even though there is an open or short circuit on one of the feed lines or one of the phase wires, thus providing the reliability desired or needed, particularly when the frequency bands provide relaying functions.
Inventors
- 👤 Daniel L. Wetherell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:58
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/56; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5425; H04B2203/5462; H04B2203/5466; H04B2203/5483; H04B2203/5491
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
261 words
An improved arrangement for coupling first and second separated frequency bands to each of first, second, and third phase wires of a power transmission line comprising: a. a first hybrid transformer having an input for said first frequency band and first and second outputs coupled thereto; b. a second hybrid transformer having an input for said second frequency band and first and second outputs coupled thereto; c. a third hybrid transformer having an input coupled to said first output of said first hybrid transformer and having first and second outputs coupled thereto; d. a fourth hybrid transformer having an input coupled to said second output of said second hybrid transformer and having first and second outputs coupled thereto; e. first, second, and third filters for said first frequency band; f. fourth, fifth, and sixth filters for said second frequency band; g. means connecting said first filter between said first output of said third hybrid transformer and said first phase wire; h. means connecting said second filter between said second output of said first hybrid transformer and said second phase wire; i. means connecting said third filter between said second output of said third hybrid transformer and said third phase wire; j. means connecting said fourth filter between said first output of said fourth hybrid transformer and said first phase wire; k. means connecting said fifth filter between said first output of said second hybrid transformer and said second phase wire; l. and means connecting said sixth filter between said second output of said fourth hybrid transformer and said third phase wire.
Claim 2
Dependent Claim
261 words
An improved arrangement for coupling first and second separated frequency bands to each of first, second, and third phase wires of a power transmission line comprising: a. a first hybrid transformer having an input for said first frequency band and first and second outputs coupled thereto; b. a second hybrid transformer having an input for said second frequency band and first and second outputs coupled thereto; c. a third hybrid transformer having an input coupled to said first output of said first hybrid transformer and having first and second outputs coupled thereto; d. a fourth hybrid transformer having an input coupled to said second output of said second hybrid transformer and having first and second outputs coupled thereto; e. first, second, and third filters for said first frequency band; f. fourth, fifth, and sixth filters for said second frequency band; g. means connecting said first filter between said first output of said third hybrid transformer and said first phase wire; h. means connecting said second filter between said second output of said first hybrid transformer and said second phase wire; i. means connecting said third filter between said second output of said third hybrid transformer and said third phase wire; j. means connecting said fourth filter between said first output of said fourth hybrid transformer and said first phase wire; k. means connecting said fifth filter between said first output of said second hybrid transformer and said second phase wire; l. and means connecting said sixth filter between said second output of said fourth hybrid transformer and said third phase wire.
Claim 3
Dependent Claim
35 words
The improved arrangement of claim 1 wherein said first, second, and third filters pass substantially only said first frequency band, and wherein said fourth, fifth, and sixth filters pass substantially only said second frequency band.
Claim 4
Dependent Claim
31 words
The improved arrangement of claim 1 wherein said first, second, and third filters reject said second frequency band, and wherein said fourth, fifth, and sixth filters reject said first frequency band.
Claim 5
Dependent Claim
27 words
The improved arrangement of claim 1 wherein each of said hybrid transformers comprises a secondary winding having a center tap with an impedance matching resistor connected thereto.
Claim 6
Dependent Claim
221 words
An improved arrangement for coupling first and second separated frequency bands to each of first, second, and third phase wires of a power transmission line comprising: a. a first hybrid transformer having an input for said first frequency band and first and second outputs coupled thereto; b. a second hybrid transformer having an input for said second frequency band and first and second outputs coupled thereto; c. a third hybrid transformer having an input and having first and second outputs coupled thereto; d. first and second filters for said first frequency band; e. third and fourth filters for said second frequency band; f. means connecting said first filter between said first output of said first hybrid transformer and said input of said third hybrid transformer; g. means connecting said third filter between said first output of said second hybrid transformer and said input of said third hybrid transformer; h. means connecting said first output of said third hybrid transformer to said third phase wire; i. means connecting said second output of said third hybrid transformer to said third phase wire; j. means connecting said second filter between said second output of said first hybrid transformer and said second phase wire; k. and means connecting said fourth filter between said second output of said second hybrid transformer and said second phase wire.
Claim 7
Dependent Claim
221 words
An improved arrangement for coupling first and second separated frequency bands to each of first, second, and third phase wires of a power transmission line comprising: a. a first hybrid transformer having an input for said first frequency band and first and second outputs coupled thereto; b. a second hybrid transformer having an input for said second frequency band and first and second outputs coupled thereto; c. a third hybrid transformer having an input and having first and second outputs coupled thereto; d. first and second filters for said first frequency band; e. third and fourth filters for said second frequency band; f. means connecting said first filter between said first output of said first hybrid transformer and said input of said third hybrid transformer; g. means connecting said third filter between said first output of said second hybrid transformer and said input of said third hybrid transformer; h. means connecting said first output of said third hybrid transformer to said third phase wire; i. means connecting said second output of said third hybrid transformer to said third phase wire; j. means connecting said second filter between said second output of said first hybrid transformer and said second phase wire; k. and means connecting said fourth filter between said second output of said second hybrid transformer and said second phase wire.
Claim 8
Dependent Claim
33 words
The improved arrangement of claim 5 wherein said first and second filters pass substantially only said first frequency band, and wherein said third and fourth filters pass substantially only said second frequency band.
Claim 9
Dependent Claim
29 words
The improved arrangement of claim 5 wherein said first and second filters reject said second frequency band, and wherein said third and fourth filters reject said first frequency band.
Claim 10
Dependent Claim
23 words
The improved arrangement of claim 5 wherein said hybrid transformers comprise a secondary winding having a center tap with a resistor connected thereto.
References Cited (Backward Citations)
US3846638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |