Title :
A high dynamic magnetooptic current transformer with advanced signal processing
Author :
Mohr, Stephan ; Bosselmann, Thomas
Author_Institution :
Corporate Technol., Siemens AG, Erlangen, Germany
Abstract :
In the power industry, current has to be measured for metering and protection purposes. Conventional sensor setups need two transformers to realize the high dynamic range. By the described mixed analog/digital signal processing algorithm, the inherent low photonic noise of the input signals was maintained up to the full sensor output. The system design is based on a rigorous investigation and optimization of the error sources in the signal processing chain. The results are proved by a demonstrator, achieving a dynamic range from 0.05 to 100 times the rated current and a ratio root mean square error of less than 0.5%.
Keywords :
Faraday effect; analogue-digital conversion; circuit noise; current transformers; electric current measurement; error analysis; magneto-optical sensors; metering; power system protection; signal processing equipment; ADC; Faraday effect; analog-to-digital interface; current sensor accuracy; current transformer output signal processing; error analysis; low input signal photonic noise; magnetooptic high dynamic range current transformers; mixed analog/digital signal processing; noise analysis; power industry current measurement; power metering; power system protection; ratio root mean square errors; signal processing error source optimization; transformer rated current; Current measurement; Current transformers; Dynamic range; Magnetic sensors; Optoelectronic and photonic sensors; Power industry; Power measurement; Power system protection; Signal processing; Signal processing algorithms;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2003.810104
