Arrangement for measuring a current with a current transducer of the Rogowski type

摘要

An arrangement for measuring a current with a Rogowski type current transducer and transducer electronics. The current transducer has a primary conductor winding for carrying the rated current to be measured, and a secondary conductor winding. The secondary conductor winding adapted to induce a voltage signal VS′ between a pair of second terminals. The current transducer having a third conductor winding adapted to receive a calibration current signal. The voltage signal VS′ contains a coil sensitivity S and is a superposition of a rated current voltage signal and an additional calibration signal. The transducer electronics being adapted to amplify both the current voltage signal and the calibration signal in the same amplifier and divide the amplified current voltage signal by that part of the amplified calibration signal that contains the coil sensitivity and the gain.

主权项

1. An arrangement for measuring a current, comprising:
a Rogowski type current transducer; and transducer electronics, wherein the current transducer includes:
a primary conductor winding having a first number of loops for carrying the rated current to be measured;a secondary conductor winding of a helical shape, the secondary conductor having a pair of second terminals and a second number of loops, said secondary conductor winding encircling the primary conductor in a toroidal manner;a third conductor winding having a pair of third terminals with a third number of loops, wherein the third conductor winding is adapted to receive a calibration current signal,wherein the secondary conductor winding is adapted to induce a voltage signal VS′ between the pair of second terminals, said voltage signal VS′ including a coil sensitivity S and being a superposition of a rated current voltage signal and an additional calibration signal, the rated current voltage being generated in response to a derivative of the rated current, and the additional calibration signal being generated in response to the derivative of the calibration current signal, and wherein the transducer electronics having an amplifier adapted to amplify both the current voltage signal and the calibration signal, and the transducer electronics being configured to divide the amplified current voltage signal by a part of the amplified calibration signal that contains the coil sensitivity and the gain.