US3633191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature monitored cable system with telemetry readout
Assignee: Ericsson Inc
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Filing: 1969-07-07
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Granted: 1972-01-04
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Expires: 1989-07-07
Abstract
Abstract In order to accurately and instantaneously measure the average temperature of a length of current carrying conductor such as a high-tension cable, a pilot wire having a conductivity which varies according to its temperature is provided a thermal communication with the conductor along its entire length, so that the conductor and pilot wire are at essentially the same temperatures but are electrically insulated from one another along their common lateral extent. A circuit is provided for measuring the conductivity and thereby the temperature of the pilot wire, and a radio telemetry transmitter transmits this information to a receiver on the ground, from which it may be retransmitted to any desired remote location. The provision of multiple pilot wires in one embodiment of the invention permits measurements of more than one segment of the conductor to be made and transmitted.
Inventors
- 👤 John Sherman Engelhardt
- 👤 Lawrence Charles Ebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:13
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; G01K3/00; G01K3/02; H; H02; H02H; H02H7/00; H02H7/22; H02H7/226
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
Apparatus for measuring the average temperature of the length of current carrying conductor, comprising: conductive means, the conductivity of which varies according to its temperature, electrically insulated from the currentcarrying conductor along their common lateral extent and in thermal communication therewith along substantially its entire length, so that the conductor and the conductive means are at essentially the same temperature; means for measuring the conductance of the conductive means; a radio transmitter connected to the measuring means for transmitting signals representative of said conductance to a receiver; and a source of DC current supplying current to the measuring means, said measuring means including a Wheatstone bridge circuit, one arm of which includes said length of current-carrying conductor connected in series with the conductive means, said DC current source being connected diagonally across the Wheatstone bridge circuit for supplying current thereto.
Claim 2
Dependent Claim
140 words
Apparatus for measuring the average temperature of the length of current carrying conductor, comprising: conductive means, the conductivity of which varies according to its temperature, electrically insulated from the currentcarrying conductor along their common lateral extent and in thermal communication therewith along substantially its entire length, so that the conductor and the conductive means are at essentially the same temperature; means for measuring the conductance of the conductive means; a radio transmitter connected to the measuring means for transmitting signals representative of said conductance to a receiver; and a source of DC current supplying current to the measuring means, said measuring means including a Wheatstone bridge circuit, one arm of which includes said length of current-carrying conductor connected in series with the conductive means, said DC current source being connected diagonally across the Wheatstone bridge circuit for supplying current thereto.
Claim 3
Dependent Claim
51 words
Apparatus as defined in claim 1 wherein said source of DC current includes means for deriving AC power from the current carrying conductor and for rectifying said AC power to produce said DC current, said AC power deriving means being a transformer, the primary winding of which is said current-carrying conductor.
Claim 4
Dependent Claim
137 words
Apparatus for measuring the average temperature of a length of current-carrying conductor terminating at one end in a pothead, said apparatus comprising: conductive means, the conductivity of which varies according to its temperature, electrically insulated from the current-carrying conductor along their common lateral extent and in thermal communication with said conductor along substantially its entire length, so that the conductor and the conductive means are at essentially the same temperatures; a housing mounted on such pothead for excluding external electric and magnetic fields, said housing being formed of an electrically conductive material and provided with rounded edges for corona shielding; means mounted in said housing for measuring the conductance of said conductive means; and a radio transmitter mounted in said housing and connected to said measuring means for transmitting signals representative of said conductance to a receiver.
Claim 5
Dependent Claim
137 words
Apparatus for measuring the average temperature of a length of current-carrying conductor terminating at one end in a pothead, said apparatus comprising: conductive means, the conductivity of which varies according to its temperature, electrically insulated from the current-carrying conductor along their common lateral extent and in thermal communication with said conductor along substantially its entire length, so that the conductor and the conductive means are at essentially the same temperatures; a housing mounted on such pothead for excluding external electric and magnetic fields, said housing being formed of an electrically conductive material and provided with rounded edges for corona shielding; means mounted in said housing for measuring the conductance of said conductive means; and a radio transmitter mounted in said housing and connected to said measuring means for transmitting signals representative of said conductance to a receiver.
Claim 6
Dependent Claim
23 words
Apparatus as defined in claim 3 wherein said radio tranSmitter includes a flush antenna mounted integrally with said housing for radiating said signals.
Claim 7
Dependent Claim
15 words
Apparatus as defined in claim 3 wherein said housing is formed integrally with such pothead.
Claim 8
Dependent Claim
22 words
Apparatus as defined in claim 3 including a corona ring mounted on such pothead, said housing being mounted on said corona ring.
Claim 9
Dependent Claim
91 words
In apparatus for electrically measuring and transmitting the value of a parameter characterizing a current-carrying cable, which cable terminates at one end in a pothead, the improvement comprising a housing integral with such pothead for excluding external electric fields, said housing being formed of an electrically conductive material and having rounded edges for corona shielding; a flush antenna mounted integrally on said housing; and means within said housing for measuring the value of such parameter and including a radio transmitter connected to said antenna for transmitting signals representative of said value.
Claim 10
Dependent Claim
91 words
In apparatus for electrically measuring and transmitting the value of a parameter characterizing a current-carrying cable, which cable terminates at one end in a pothead, the improvement comprising a housing integral with such pothead for excluding external electric fields, said housing being formed of an electrically conductive material and having rounded edges for corona shielding; a flush antenna mounted integrally on said housing; and means within said housing for measuring the value of such parameter and including a radio transmitter connected to said antenna for transmitting signals representative of said value.
Claim 11
Dependent Claim
14 words
Apparatus as defined in claim 7 wherein said radio transmitter includes a biphase modulator.
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |