Measuring system for partial discharges

Details Measuring system for partial discharges Measuring system for partial discharges

G - Physics

01

R

G01R 31/02 (2006.01) G01R 15/16 (2006.01) G01R 31/12 (2006.01)

Patent

CA 2174606

The present invention relates to a method and a device for detecting partial discharges in cables and accessories, comprising the following steps of: interrupting the metal earth shield of the cable; connecting both sides of the interrupted sheath to a measuring instrument; arranging a connection between both sides of the interrupted sheath which is at least suitable for transferring the signals with the mains frequency; and displaying the signal, wherein only signal components with frequencies greater than 0.5 MHz are displayed. As a result of these steps, the interference associated with the first mentioned frequency range is avoided. It is noted here that the signal/noise ratio of the frequency range applied according to the invention is more favourable. In order to properly be able to examine the quality of a partial discharge, it is important to relate it to the voltage of the cable in which the partial discharge takes place. The present invention provides a method wherein prior to display the signal is combined with a signal representing the mains voltage. It is especially attractive when the signal representing the mains voltage is generated in contact-free manner, for example in capacitive manner.

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