Patent ID: 6633168
Filing Date: 2003-10-14
Classification: G01R,H01F

Abstract:
A detector for detecting partial discharge in a voltage transformer, the transformer having a primary voltage winding and a secondary voltage winding, each voltage winding including a surface wherein the primary voltage winding and the secondary voltage winding are substantially concentric about an axis extending parallel to the surfaces, the transformer for transforming a primary voltage on the primary winding to a secondary voltage on the secondary winding the detector comprising:an electrostatic shield operably attached to the transformer between the primary winding and the secondary winding, the electrostatic shield having a surface substantially parallel to the surfaces of the first and second voltage windings; and, a radio frequency current transformer operably connected to the electrostatic shield wherein the occurrence of a partial discharge from one of the windings in the voltage transformer is detected by the radio frequency current transformer.