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UHF partial discharge and location measuring device for high-voltage power devices

  • US 8,008,926 B2
  • Filed: 12/29/2008
  • Issued: 08/30/2011
  • Est. Priority Date: 09/30/2008
  • Status: Active Grant
First Claim
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1. A UHF partial discharge and location measuring device for high-voltage power devices, the device comprising:

  • a partial discharge sensor attached to a Device Under Test (DUT) to detect a partial discharge signal;

    an external noise sensor located outside the DUT to detect an external noise signal;

    an analogue-digital converter that receives a partial discharge signal from the partial discharge sensor and an external noise signal from the external noise sensor and digitalizes the received signals;

    a peak detector that extracts a peak value of the digitalized signal for each sensor;

    a partial discharge signal processor that generates a peak signal for a phase and time of a power signal applied to the DUT, density of the peak signal for the phase of the power signal applied to the DUT, and a long-term variation in trend of the partial discharge signal from the extracted peak value for each sensor;

    an arrival time detector that detects a start point of the partial discharge signal and detects an arrival time;

    a discharge location processor that yields a discharge location from a location coordinate where the partial discharge sensor is positioned and the arrival time and performs a statistical process on the yielded discharge location according to a number of yield times; and

    a display unit that displays the peak signal, the density, the variation in trend, and the discharge location.

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