Fiber aligned and motionally coupled with electric cable
First Claim
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1. A device for detecting partial discharge in an electric cable, the device comprising:
- an electromagnetic radiation source configured for generating primary electromagnetic radiation to be coupled into at least one fiber at least a part of which being aligned along and motionally coupled with the electric cable, wherein a corresponding section of the fiber follows the mechanical motion of the electric cable;
an electromagnetic radiation detector configured for detecting secondary electromagnetic radiation generated in the at least one fiber in response to the coupling of the primary electromagnetic radiation into the at least one fiber and being influenced by partial discharge induced local motion of the electric cable, which local motions couple to the at least one fiber; and
a partial discharge determining unit configured for determining information indicative of the partial discharge in the electric cable based on an analysis of the motionally influenced secondary electromagnetic radiation detected by the electromagnetic radiation detector considering an influence of the partial discharge induced local motions and regardless of electromagnetic radiation generated in or around the electric cable due to the partial discharge.
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Abstract
An arrangement having an electric cable, at least one fiber at least a part of which being aligned along and motionally coupled with the electric cable, and a device for detecting effects in the electric cable via said at least one fiber.
11 Citations
22 Claims
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1. A device for detecting partial discharge in an electric cable, the device comprising:
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an electromagnetic radiation source configured for generating primary electromagnetic radiation to be coupled into at least one fiber at least a part of which being aligned along and motionally coupled with the electric cable, wherein a corresponding section of the fiber follows the mechanical motion of the electric cable; an electromagnetic radiation detector configured for detecting secondary electromagnetic radiation generated in the at least one fiber in response to the coupling of the primary electromagnetic radiation into the at least one fiber and being influenced by partial discharge induced local motion of the electric cable, which local motions couple to the at least one fiber; and a partial discharge determining unit configured for determining information indicative of the partial discharge in the electric cable based on an analysis of the motionally influenced secondary electromagnetic radiation detected by the electromagnetic radiation detector considering an influence of the partial discharge induced local motions and regardless of electromagnetic radiation generated in or around the electric cable due to the partial discharge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An arrangement, comprising:
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an electric cable; at least one fiber at least a part of which being aligned along and motionally coupled with the electric cable, wherein a corresponding section of the fiber follows the mechanical motion of the electric cable; a device for detecting partial discharge in the electric cable based on an analysis of motionally influenced electromagnetic radiation detected by an electromagnetic radiation detector, the electromagnetic radiation generated in the at least one fiber in response to coupling of electromagnetic radiation into the at least one fiber and influenced by partial discharge induced motion considering an influence of the partial discharge induced local motions and regardless of electromagnetic radiation generated in or around the electric cable due to the partial discharge. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of detecting partial discharge in an electric cable, the method comprising:
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coupling primary electromagnetic radiation into at least one fiber at least a part of which being aligned along and motionally coupled with the electric cable, wherein a corresponding section of the fiber follows the mechanical motion of the electric cable; detecting secondary electromagnetic radiation generated in the at least one fiber in response to the coupling of the primary electromagnetic radiation into the at least one fiber and being influenced by partial discharge induced local motions of the electric cable, which local motions couple to the at least one fiber; and determining information indicative of the partial discharge in the electric cable based on an analysis of the motionally influenced detected secondary electromagnetic radiation considering an influence of the partial discharge induced local motions regardless of electromagnetic radiation generated in or around the electric cable due to the partial discharge.
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21. An arrangement, comprising:
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an electric cable; at least one fiber at least a part of which being aligned along and vibrationally coupled with the electric cable; and a device arranged with a source for generating primary electromagnetic radiation to be coupled into the at least one fiber, a detector configured for detecting secondary electromagnetic radiation generated in the at least one fiber in response to the coupling of the primary electromagnetic radiation into the at least one fiber and being influenced by partial discharge induced local motion of the electric cable, and a determining unit configured for determining information indicative of the partial discharge in the electric cable based on an analysis of the vibrationally influenced secondary electromagnetic radiation detected by the detector considering an influence of the partial discharge induced local motions and regardless of electromagnetic radiation generated in or around the electric cable due to the partial discharge; wherein a position of the partial discharge event within the fiber is mapped to the position along the electric cable by a mapping scheme.
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22. A method of detecting partial discharge events in an electric cable, the method, comprising:
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coupling primary electromagenetic radiation into at least one fiber at least part of which being aligned along and vibrationally coupled with the electric cable; detecting secondary electromagnetic radiation generated in the at least one fiber in response to the coupling of the primary electromagnetic radiation into the at least one fiber and being influenced by partial discharge event induced local vibration of the electric cable, which local vibration couples to the at least one fiber; determining a width of each partial discharge event on a time scale; determining a distance between a pair of two subsequent partial discharge events on a time scale; statistically evaluating the determined width and the determined distance; and determining the strength of the partial discharge events based on the statistical evaluation.
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Specification