Abb Schweiz Ag

Abb Technology Ag

Abb Research Ltd.

Centre National De La Recherche Scientifique

Abb Ag

L'universite De Strasbourg

Joris Pascal

Rolf Disselnkötter

Richard Bloch

Franz Zurfluh

Jean-Baptiste Kammerer

Bernhard Deck

Yannick Maret

Stéphane Isler

Simon Paulus

The present application relates to a method for providing a corrected measuring signal indicating a high voltage on a high-voltage node (HV), including: injecting a periodic injection signal into a voltage divider coupled between the high-voltage node (HV) and a reference potential; obtaining a sensing signal at a sensing node (S) of the voltage divider, wherein the sensing signal depends on the periodic injection signal; from the sensing signal, separating a first sensing signal portion resulting from the high voltage and a second sensing signal portion resulting from the periodic injection signal; and depending on the second sensing signal portion, correcting the first sensing signal portion corresponding to the high-voltage signal in order to obtain the corrected measuring signal.

High-voltage measuring unit with self-correction

The invention is about a current transducer of the Rogowski type, with a primary conductor winding having a first number of loops (N) for carrying the rated current (I) to be measured, with a secondary conductor winding having a pair of second terminals and a helical shape and a second number of loops (N), said secondary conductor winding encircling the primary conductor in a toroidal manner, whereby a rated current voltage signal Vis induced between the pair of second terminals of the secondary winding, said rated current voltage signal being characteristic for the derivative of the rated current (dI/dt), with a transducer electronics (IED) configured to receive the rated current voltage signal (V), characterized in that the current transducer comprises a third conductor winding having a pair of third terminals with a third number of loops (N), whereby the transducer electronics (IED) is configured to feed a calibration current signal (I) into the third conductor winding, whereby in response to the derivative of the calibration current signal (dl-/dt) an additional calibration signal (V) is created between the pair of second terminals of the second winding and whereby the transducer electronics (IED) is configured to process the rated current voltage signal (V) and the calibration signal (V) to derive a corrected voltage signal (V) with a calibrated sensitivity S.

Current transducer of the Rogowksi type and arrangement for measuring a current

A current measurement device for measuring a current through a primary conductor is provided. The current measurement device comprises a current transducer of the Rogowski type, the current transducer comprising a conductor winding connected to a pair of transducer terminals and adapted to induce there between a measurement voltage indicative of a current through the primary conductor; a pair of calibration terminals adapted for providing a calibration current to a calibration current path conforming to the primary conductor, so that the calibration current induces a calibration response voltage component between the pair of transducer terminals; and a control circuit. The control circuit comprises a calibration current generator for generating the calibration current and connected to the pair of calibration terminals for providing the calibration current via the pair of calibration terminals to the calibration current path, and a voltage analyzer connected to the pair of transducer terminals for receiving the calibration response voltage component induced between the pair of transducer terminals.

Current measurement device and method using a Rogowski type current transducer

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 V' between a pair of second terminals. The current transducer having a third conductor winding adapted to receive a calibration current signal. The voltage signal V&#x2032; 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.

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

An exemplary method for calibrating a current transducer of the Rogowski type including a Rogowski coil sensor and an electronic device is performed by determining and correcting the sensitivity of the current transducer of the Rogowski type through the measurement of the self-inductance Lof the coil using the electronic device.

Method for calibrating a current transducer of the rogowski type

An arrangement for reading out an analog voltage signal includes a voltage signal input for applying the analog voltage signal thereto, a reference unit configured to generate an analog reference voltage, and a converting unit configured to convert an analog input signal into a digital output signal. To enable online self-calibration of the arrangement, the arrangement includes a superposition unit configured to receive the analog voltage signal and the analog reference voltage. The superposition unit includes a modulation unit configured to generate a modulated reference voltage from the analog reference voltage. The superposition unit is configured to generate a combined analog signal by superimposing the modulated reference voltage onto the analog voltage signal, and to forward the combined analog signal to the converting unit.

Arrangement for reading out an analog voltage signal

An arrangement for reading out an analog voltage input signal includes an input applying the input signal thereto, and a reference unit generating an analog reference voltage. To perform online self-calibration, the arrangement includes a superposition unit generating a combined analog signal by superimposing the analog reference voltage onto the input signal, a converting unit converting the combined analog signal into a one-bit serial data stream at a conversion sampling rate, and a decomposition unit, which includes at least two digital filters configured to generate from the serial data stream two corresponding digital signals at different data rates, which can be less than the conversion sampling rate. Two data processing units calculate from the corresponding digital signal a digital input voltage representing the input signal and a digital reference voltage representing the analog reference voltage or a disturbance voltage signal representing parasitic voltage components introduced by the superposition unit, respectively.

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Baden, Switzerland

Joris Pascal