Magnetic based temperature sensing for electrical transmission line
First Claim
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1. A temperature-sensing apparatus for sensing a temperature of an electrical transmission line, the apparatus comprising:
- a passive circuit comprising an inductor, the inductor including a temperature sensitive core having a composition with a relative magnetic permeability variable with temperature, the passive circuit having at least one of a resonance frequency or a Q value that varies with temperature;
a magnetic shielding structure disposed adjacent to the temperature sensitive core, and the magnetic shielding structure being configured to shield the temperature sensitive core from a magnetic field from the electrical transmission line when the temperature sensitive core is disposed in magnetic proximity to the electrical transmission line; and
a fixture comprising a chamber to accommodate the temperature sensitive core, and a channel to accommodate the electrical transmission line,wherein the chamber and the channel communicate with each other such that the temperature sensitive core is disposed in thermal contact with the electrical transmission line, andwherein the inductance of the inductor varies with the temperature of the electrical transmission line.
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Abstract
Systems and methods for sensing, measuring, or monitoring the temperature of an electrical transmission line of an electrical cable, are provided. A temperature sensitive inductor is disposed in thermal contact with the electrical transmission line. The temperature of the electrical transmission line can be sensed, measured, or monitored by measuring the inductance of the temperature sensitive inductor. Mechanisms and methods to eliminate, minimize, or account for the magnetic coupling between the current carried by the electrical transmission line and the temperature sensitive inductor are provided.
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Citations
19 Claims
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1. A temperature-sensing apparatus for sensing a temperature of an electrical transmission line, the apparatus comprising:
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a passive circuit comprising an inductor, the inductor including a temperature sensitive core having a composition with a relative magnetic permeability variable with temperature, the passive circuit having at least one of a resonance frequency or a Q value that varies with temperature; a magnetic shielding structure disposed adjacent to the temperature sensitive core, and the magnetic shielding structure being configured to shield the temperature sensitive core from a magnetic field from the electrical transmission line when the temperature sensitive core is disposed in magnetic proximity to the electrical transmission line; and a fixture comprising a chamber to accommodate the temperature sensitive core, and a channel to accommodate the electrical transmission line, wherein the chamber and the channel communicate with each other such that the temperature sensitive core is disposed in thermal contact with the electrical transmission line, and wherein the inductance of the inductor varies with the temperature of the electrical transmission line. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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2. A temperature-sensing apparatus for sensing a temperature of an electrical transmission line, the apparatus comprising:
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a passive circuit comprising an inductor, the inductor including a temperature sensitive core having a composition with a relative magnetic permeability variable with temperature, the passive circuit having at least one of a resonance frequency or a Q value that varies with temperature; and a hollow coupler for electrically connecting portions of the electrical transmission line in series, and the inductor being positioned in an inner space of the hollow coupler, wherein the temperature sensitive core is disposed in thermal contact with the electrical transmission line, and the inductance of the inductor varies with the temperature of the electrical transmission line.
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13. A method of sensing a temperature of an electrical transmission line, the method comprising:
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providing a passive circuit having at least one of a resonance frequency and a Q value that varies with temperature, the passive circuit comprising an inductor including a temperature sensitive core; disposing the temperature sensitive core in thermal contact with the electrical transmission line, further comprising disposing the temperature sensitive core inside a hollow coupler that electrically connects portions of the electrical transmission line in series; providing a transceiver unit configured to be electromagnetically coupled to the passive circuit; measuring, via an electromagnetic coupling between the transceiver unit and the passive circuit, the resonant frequency or the Q value of the passive circuit; and determining the temperature of the electrical transmission line based on the measured resonant frequency or Q value, wherein the temperature sensitive core has a composition with a relative magnetic permeability variable with temperature, and the inductance of the inductor and the resonant frequency or the Q value of the passive circuit vary with the temperature of the electrical transmission line. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification