Method and a device for detecting an internal arc in a metal-clad electrical link
First Claim
1. A method of detecting an internal arc in a metal-clad electrical link, comprising detecting, at a fixed location along a cladding of the electrical link, a rising edge of an internal pressure surge generated by the internal arc and propagating inside the cladding, wherein the detecting of the rising edge comprises measuring a pressure inside the cladding continuously for first and second time intervals which are equal in duration, shorter than a time taken by the rising edge to go past the fixed location and separated by a third time interval shorter than the time taken by the rising edge to go past the fixed location, integrating a curve of the pressure measurements taken during each of the first and second time intervals, determining a difference between the two integration values, and comparing the difference with a threshold value.
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Abstract
The invention relates to a method of detecting an internal arc in a metal-clad electrical link, wherein the rising edge of the internal pressure surge generated by the arc and propagating inside the cladding is detected at a fixed location along the cladding. The invention also relates to a device comprising at least one one-way detection unit constituted by a pressure sensor disposed outside the cladding and connected to the inside the cladding via a horn-shaped duct which slopes relative to the axis of the cladding, which has its mouth opening out in the cladding, and which has its tip connected to the pressure sensor.
6 Citations
6 Claims
- 1. A method of detecting an internal arc in a metal-clad electrical link, comprising detecting, at a fixed location along a cladding of the electrical link, a rising edge of an internal pressure surge generated by the internal arc and propagating inside the cladding, wherein the detecting of the rising edge comprises measuring a pressure inside the cladding continuously for first and second time intervals which are equal in duration, shorter than a time taken by the rising edge to go past the fixed location and separated by a third time interval shorter than the time taken by the rising edge to go past the fixed location, integrating a curve of the pressure measurements taken during each of the first and second time intervals, determining a difference between the two integration values, and comparing the difference with a threshold value.
- 5. A device detecting an internal arc in a metal-clad electrical link, the device comprising at two-way detection unit for detecting a rising edge of an internal pressure surge generated by the internal arc and propagating inside a cladding of the electrical link, the detection unit including first and second pressure sensors disposed outside the cladding, and first and second tapered horn-shaped ducts connected to the inside of the cladding and sloping mutually opposite directions relative to the axis of the cladding, wherein the first and second tapered horn-shaped ducts have mouths opening in the cladding, and tips which joined together at a common junction, and said first and second pressure sensors are connected in parallel to the common junction.
Specification
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- Resources
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Current AssigneeAlstom Holdings (Alstom SA)
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Original AssigneeAlstom Holdings (Alstom SA)
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InventorsMarmonier, Jean
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Primary Examiner(s)RAEVIS, ROBERT R
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Application NumberUS09/447,058Time in Patent Office1,092 DaysField of Search738/658, 734/321US Class Current73/432.1CPC Class CodesG01L 19/0007 Fluidic connecting meansG01R 31/08 Locating faults in cables, ...G01R 31/1209 using acoustic measurements...
