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Temperature and frequency dependence of precision current transformer based on Rogowski coils

This paper covers the analysis of electrical parameters which affect the accuracy of current-to-voltage transducer based on Rogowski coil. The actual transducer is designed for high-accuracy measurement of AC current (up to 20 A at power supply frequency of 50 Hz, with the aiming uncertainty of 100 parts per million). The primary source of uncertainty of ac current measured by this type of transducer is non-ideal geometry (i.e. mutual position between primary conductor and secondary coils). Except these influencing parameters, the temperature dependence of coil geometry affect the accuracy as additional source of uncertainty, as well as the self resonance frequency, especially on higher frequencies. The analysis of influence of these parameters and temperature compensation of transformer transimpedance makes the topic of this work.

Rogowski coil; temperature compensation; frequency compensation

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