Method and system for measuring/detecting ice or snow atmospheric accretion on overhead power lines
First Claim
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1. A device for detecting and/or measuring atmospheric accretion on a suspended electrical cable span of overhead power lines, comprising:
- a casing to be traversed by a portion of the cable;
a three-axis accelerometer for acquiring cable motion data over time to measure a fundamental frequency of electrical cable oscillations, said fundamental frequency being solely necessary to determine a sag of said suspended electrical cable portion, which is called the method of operations fundamental frequency;
a local mechanical tension sensor device having at least one strain gauge sensor, said local mechanical tension sensor device being arranged to impose a deflection to the cable portion traversing the casing, to obtain a deflected cable portion, and to provide a raw local tension over time as resulting output strain gauge measurements; and
a transmitter for transmitting said cable motion and raw local tension data to a data processing unit capable of detecting and/or measuring said atmospheric accretion from complementing and/or combining said sag and said raw local tension data;
wherein the local mechanical tension sensor is internal to the casing and adjusted therein to obtain a predetermined deflection, and made of a transverse mechanical compact part or support hosting a central circular cavity for accommodating the electric cable portion and applying a deflection thereto which is perpendicular to the cable axis; and
a strain gauge sensor symmetrically on each transverse side of said cavity for measuring the tension caused by the deflection.
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Abstract
The present invention is related to a method for detecting and/or measuring atmospheric accretion on a suspended electrical cable span (2) of overhead power lines, said suspended electrical cable span (2) having a sag (D) and a local tension (H), and being submitted to wind pressure (wwind), comprising the steps of independently:
- measuring said sag (D), and optionally measuring the wind pressure (wwind), over a first time range,
- measuring the local tension (H) over a second time range,
the results of both steps being complemented and/or combined, so that to allow atmospheric accretion detection and/or measurement.
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17 Claims
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1. A device for detecting and/or measuring atmospheric accretion on a suspended electrical cable span of overhead power lines, comprising:
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a casing to be traversed by a portion of the cable; a three-axis accelerometer for acquiring cable motion data over time to measure a fundamental frequency of electrical cable oscillations, said fundamental frequency being solely necessary to determine a sag of said suspended electrical cable portion, which is called the method of operations fundamental frequency; a local mechanical tension sensor device having at least one strain gauge sensor, said local mechanical tension sensor device being arranged to impose a deflection to the cable portion traversing the casing, to obtain a deflected cable portion, and to provide a raw local tension over time as resulting output strain gauge measurements; and a transmitter for transmitting said cable motion and raw local tension data to a data processing unit capable of detecting and/or measuring said atmospheric accretion from complementing and/or combining said sag and said raw local tension data; wherein the local mechanical tension sensor is internal to the casing and adjusted therein to obtain a predetermined deflection, and made of a transverse mechanical compact part or support hosting a central circular cavity for accommodating the electric cable portion and applying a deflection thereto which is perpendicular to the cable axis; and a strain gauge sensor symmetrically on each transverse side of said cavity for measuring the tension caused by the deflection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification