A non-conventional instrument transformer

•NCIT uses the low-power current transformers for metering high-voltage parameters.•NCIT allows for a greater accuracy of the captured data even at higher frequencies.•The NCIT is equally precise as the conventional voltage and current transformer.•Currents and voltages errors correspond to accuracy class of 0.2.

The paper describes a non-conventional instrument transformer (NCIT) offering the possibility of adapting the measuring points in the high-voltage power network to new states as a result of the impact of intermittent renewable energy resources, harmonic distortions evoked by switching apparatus and smart-grid systems, enabling prompt and accurate measurements in a wider frequency range at a higher dynamics, and providing more reliable operation of the power network. The features of the proposed NCIT are in using the low-power current transformers (LPCT) and in the measuring and processing electronics which are situated partially on the potential of high voltage (HV) line and partially on earth potential.

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