PARTIAL DISCHARGE ACQUISITION SYSTEM COMPRISING A CAPACITIVE COUPLING ELECTRIC FIELD SENSOR
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Abstract
A partial discharge detecting device includes an electric field sensor including: a first electrode configured to detect by capacitive coupling a partial discharge signal generated by an electrical object and to provide a corresponding first electrical signal, and a second electrode isolated from the first electrode and structured to detect an environmental noise and to provide a corresponding second electrical signal. The detecting device further includes a transmission line structured to propagate an output signal obtained from the electric field sensor toward an external analysis apparatus and an electronic module connected to the first and second electrodes and structured to process the first and second electrical signals and to provide the output signal to the transmission line. The electronic module is structured to decouple the electric field sensor from the transmission line and avoid resonance of the electric field sensor with the transmission line.
40 Citations
35 Claims
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1-17. -17. (canceled)
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18. A partial discharge detecting device, comprising:
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an electric field sensor comprising; a first electrode configured to detect by capacitive coupling a partial discharge signal generated by an electrical object and to provide a corresponding first electrical signal; and a second electrode isolated from the first electrode and structured to detect an environmental noise and to provide a corresponding second electrical signal; a transmission line structured to propagate an output signal obtained from the electric field sensor toward an external analysis apparatus; and an electronic module connected to the first and second electrodes and structured to process the first and second electrical signals and to provide the output signal to the transmission line, wherein the electronic module is structured to decouple the electric field sensor from the transmission line and to substantially avoid resonance of the electric field sensor with the transmission line. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method for acquiring partial discharge signals, comprising:
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providing an electric field sensor comprising a first electrode capacitively coupled to an electrical object and a second electrode isolated from the first electrode; detecting by said first electrode a partial discharge signal generated by the electrical object and providing a corresponding first electrical signal; detecting by said second electrode an environmental noise and providing a corresponding second electrical signal; processing the first and second electrical signals and providing an output signal to be propagated on a transmission line; decoupling the electric field sensor from the transmission line for substantially avoiding resonance of the electric field sensor with the transmission line; propagating the output signal by the transmission line; and processing the output signal received from the transmission line to provide partial discharge amplitude values. - View Dependent Claims (35)
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Specification