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US3591752A
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US
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Apparatus for measuring the conductor and shield temperature of high voltage cable
Assignee: Reynolds Metals Co
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Filing: 1969-12-08
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Granted: 1971-07-06
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Expires: 1989-12-08
Abstract
Abstract A temperature-sensitive device is placed in contact with the conductor of a measuring loop in order to indirectly measure the temperature in the conductor of a cable undergoing a load cycle test. The temperature of the metallic shield of the cable is measured directly with a temperature-sensitive device in contact therewith. A feedback circuit is provided to automatically control the current input necessary to achieve and maintain a desired conductor temperature throughout the entire load cycle test.
Inventors
- 👤 Jorge G Valdes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
Apparatus for measuring the temperature of the metallic shield of a cable and for determining the temperature of the conductor of said cable having a first current flowing therein, comprising a first inductive device associated with said cable for generating a second induced current in said first inductive device proportional to said first current flowing in the conductor and having current conducting means whose temperature is responsive to the second induced current whereby the temperature of said conductive means will be proportional to the temperature of said conductor of said cable, a first temperaturesensitive device for measuring the temperature of said conducting means and generating a first signal proportional thereto, a second temperature-sensitive device in contact with said metallic shield for measuring the shield temperature and for generating a second signal proportional thereto, and means for recording said signals.
Claim 2
Dependent Claim
139 words
Apparatus for measuring the temperature of the metallic shield of a cable and for determining the temperature of the conductor of said cable having a first current flowing therein, comprising a first inductive device associated with said cable for generating a second induced current in said first inductive device proportional to said first current flowing in the conductor and having current conducting means whose temperature is responsive to the second induced current whereby the temperature of said conductive means will be proportional to the temperature of said conductor of said cable, a first temperaturesensitive device for measuring the temperature of said conducting means and generating a first signal proportional thereto, a second temperature-sensitive device in contact with said metallic shield for measuring the shield temperature and for generating a second signal proportional thereto, and means for recording said signals.
Claim 3
Dependent Claim
39 words
Apparatus as set forth in claim 1 in which said first inductive device is a current transformer wherein the conductor of the cable forms the primary winding and said current conducting means forms the secondary winding of the transformer.
Claim 4
Dependent Claim
22 words
Apparatus as set forth in claim 2 in which said first temperature-sensitive device is in direct contact with said current conducting means.
Claim 5
Dependent Claim
22 words
Apparatus as set forth in claim 3 in which said cable and said current conducting means are substantially identical in cross section.
Claim 6
Dependent Claim
49 words
Apparatus as set forth in claim 1 in which the magnitude of the first current flowing in the conductor is regulated by a feedback system comprising, means connected to said first temperature-sensitive device for using said first signal to regulate and control the first current flowing in said conductor.
Claim 7
Dependent Claim
21 words
Apparatus as set forth in claim 1 further including a second inductive device for inducing said first current in said conductor.
Claim 8
Dependent Claim
56 words
Apparatus as set forth in claim 6 in which the magnitude of the first current flowing in the conductor is regulated by a feedBack system comprising, means connected to said first temperature-sensitive device and to said second inductive device for using said first signal to regulate and control the power input into said second inductive device.
Claim 9
Dependent Claim
22 words
Apparatus as set forth in claim 7 further including a timer for cyclically regulating the power supplied to said second inductive device.
Claim 10
Dependent Claim
18 words
Apparatus as set forth in claim 8 further including a power source connected to said second inductive device.
Claim 11
Independent Claim
99 words
The method of load cycle testing a voltage cable having a first conductor and a first metallic shield comprising the steps of: a. causing a current to flow in said first conductor thereby generating a first temperature signal indicative of the temperature of said first metallic shield, b. inducing a current in an associated second conductor of a measuring loop, thereby generating a second temperature signal indicative of the temperature of said second conductor, c. measuring the first temperature signal of said metallic shield, and d. measuring the second temperature signal of said second conductor of said measuring loop.
Claim 12
Independent Claim
99 words
The method of load cycle testing a voltage cable having a first conductor and a first metallic shield comprising the steps of: a. causing a current to flow in said first conductor thereby generating a first temperature signal indicative of the temperature of said first metallic shield, b. inducing a current in an associated second conductor of a measuring loop, thereby generating a second temperature signal indicative of the temperature of said second conductor, c. measuring the first temperature signal of said metallic shield, and d. measuring the second temperature signal of said second conductor of said measuring loop.
Claim 13
Dependent Claim
19 words
The method of claim 10 further comprising the step of: a. recording the first and the second temperature signals.
Claim 14
Dependent Claim
64 words
The method of claim 10 further comprising the steps of: a. providing a source of power to cause said current to flow in said conductor, b. providing a feedback circuit for sensing the second temperature signal, and c. connecting said feedback circuit to said second conductor of the measuring loop and to said power source to provide an automatic control for the power source.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |