Patent ID: 6437554
Filing Date: 2002-08-20
Classification: G01R

Abstract:
An air core current transducer measurement system for measuring current flow in a high voltage electrical conductor, said system having a high voltage end and a low voltage end and comprising:at said high voltage end, an electrically conductive case; an air-core current transducer, including a coil, for sensing current flow in the high voltage electrical conductor and for producing a time derivative output signal related to the current flow sensed by the current transducer; an electrostatic shield connected to said case for shielding said coil; a low pass filter, connected to said current transducer, for filtering out electrical noise contained in said time derivative output signal; an integration and scaling circuit, located in said case and connected to said low pass filter for converting said time derivative signal into a scaled signal; and an electrical-optical converter for converting said scaled signal into a corresponding light signal; and at said low voltage end, an optical-electrical converter, electrically isolated from and optically coupled to said integration and scaling circuit through said electrical-optical converter, for converting said light signal into a corresponding scaled current output signal.