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Device for sensing of electric discharges in a test object

  • US 5,933,012 A
  • Filed: 05/12/1997
  • Issued: 08/03/1999
  • Est. Priority Date: 09/14/1995
  • Status: Expired due to Fees
First Claim
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1. A device for sensing electric discharges in a current transformer arranged at a current-carrying conductor, the transformer having a secondary winding and a high-voltage bushing, in which bushing downwardly and upwardly extending parts of either of the current-carrying conductor and the secondary winding are arranged, the device comprising evaluation equipment and a Rogowski coil for delivery of a sensor signal to said evaluation equipment, wherein said Rogowski coil surrounds the downwardly and upwardly extending parts of either of the current-carrying conductor and the secondary winding, and said evaluation equipment in dependence on received sensor signals generates an indicating signal, indicating an electric discharge in the current transformer when the Rogowski coil senses current pulses which essentially simultaneously flow in the downwardly and upwardly extending parts of either of the current-carrying conductor and the secondary winding, either in a direction out of the current transformer or in a direction into the current transformer.

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