Some remarks on metrological properties and production technology of current transformers made of nanocrystalline cores

[Display omitted] •The key steps of current transformer (CT) module manufacturing process.•Labview based measurement system for metrological properties of CT.•Properties of CT-s in the presence of adjacent phases and external dc magnetic field. Instrument current and voltage transformers remain the basic apparatuses used in energy measurements in electrical grid. The increasing importance of distributed energy sources necessitates more accurate measurements of consumed as well as generated electrical energy. Both types occur in low voltage network where the main focus is on current transformers (CTs) for electronic-type electrical energy meters. These current transformers should fulfil many requirements for precise electrical energy measurements. This paper presents a modern measurement system for various metrological research of CTs offered as 1 and 3-phase current transformers modules (CTMs).