An apparatus for detecting a partial discharge in a high voltage transformer comprising a live tank comprises a metal box detachably connected to the tank; a first acoustic sensor inside the box for converting acoustic waves in a first frequency band to a first electrical output signal; signal conditioning...http://www.google.fr/patents/US5530366?utm_source=gb-gplus-shareBrevet US5530366 - Acoustic optical system for partial discharge detection and location
Acoustic optical system for partial discharge detection and location
