US3796920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for a repeatered power line carrier system that provides protective relaying
Assignee: General Electric Co
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Filing: 1973-06-20
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Granted: 1974-03-12
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Expires: 1993-06-20
Abstract
Abstract In power line carrier systems, repeaters are provided at station or switchyard locations between line sections to transmit signals in both directions around the location. In some systems tones are transmitted to provide protective relaying. In such cases, it is desirable or essential that the tones be restricted to the desired line sections and not be transmitted by the repeaters to further line sections so that proper protective relaying is provided. A circuit arrangement is provided to block the repeaters at each location, either in response to a tone from a distant location or in response to a tone being produced at the one location for transmission to a distant location, and thus provide proper protective relaying.
Inventors
- 👤 D Hedrick
- 👤 E Wilmoth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:31
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/56; H02; H02H; H02H1/00; H02H1/0061; H02H1/0076; H02H7/00; H02H7/26; H02H7/261; H02H7/262; H04B2203/00; H04B2203/54; H04B2203/5462; H04B2203/5479; H04B2203/5483; H04B2203/5491
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
339 words
In a power line carrier system having a first receiver connected through a repeater to a first transmitter and a second receiver connected through said repeater to a second transmitter, said first receiver having its input and said second transmitter having its output connected to a first transmission line and said second receiver having its input and said first transmitter havings its output connected to a second transmission line, a first tone responsive device connected to the output of said first receiver and adapted to provide an indication of said first receiver receiving a tone, a second tone responsive device connected to the output of said second receiver and adapted to provide an indication of said second receiver receiving a tone, a first tone oscillator connected to the input of said first transmitter for applying a tone to said second transmission line in response to a fault condition on said first transmission line, a second tone oscillator connected to the input of said second transmitter for applying a tone to said first transmission line in response to a fault condition on said second transmission line, the improvement comprising: a. switching means having four inputs and an output for producing a blocking signal at said output in response to at least one of said oscillator tones or in response to at least one of said indications at any of said four inputs; b. means for connecting one of said switching means inputs to said first tone responsive device; c. means for connecting one of said switching means inputs to said second tone responsive device; d. means for connecting one of said switching means inputs to said fiRst tone oscillator; e. means for connecting one of said switching means inputs to said second tone oscillator; f. and means for connecting said switching means output to said repeater for blocking transmission through said repeater in both directions in response to receipt of an oscillator tone or in response to receipt of an indication at a respective one of said switching means inputs.
Claim 2
Dependent Claim
339 words
In a power line carrier system having a first receiver connected through a repeater to a first transmitter and a second receiver connected through said repeater to a second transmitter, said first receiver having its input and said second transmitter having its output connected to a first transmission line and said second receiver having its input and said first transmitter havings its output connected to a second transmission line, a first tone responsive device connected to the output of said first receiver and adapted to provide an indication of said first receiver receiving a tone, a second tone responsive device connected to the output of said second receiver and adapted to provide an indication of said second receiver receiving a tone, a first tone oscillator connected to the input of said first transmitter for applying a tone to said second transmission line in response to a fault condition on said first transmission line, a second tone oscillator connected to the input of said second transmitter for applying a tone to said first transmission line in response to a fault condition on said second transmission line, the improvement comprising: a. switching means having four inputs and an output for producing a blocking signal at said output in response to at least one of said oscillator tones or in response to at least one of said indications at any of said four inputs; b. means for connecting one of said switching means inputs to said first tone responsive device; c. means for connecting one of said switching means inputs to said second tone responsive device; d. means for connecting one of said switching means inputs to said fiRst tone oscillator; e. means for connecting one of said switching means inputs to said second tone oscillator; f. and means for connecting said switching means output to said repeater for blocking transmission through said repeater in both directions in response to receipt of an oscillator tone or in response to receipt of an indication at a respective one of said switching means inputs.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |