Influence of normal-compressed stresses on measurement precision of toroidal and oval nanocrystalline cut cores used for metering

The following paper presents the analysis of influence on measurement precision due to change of magnetic properties of nanocrystalline wound cut cores caused by normal-compressed stresses. Two types of nanocrystalline cut cores were examined: toroidal core and oval core. The mass, path length and cross section of both cores were identical but the shape of cores was different. The same range of normal-compressed stresses force was applied on cores and the significantly different results of measurement precision were obtained. This has to be taken into account at the design stage of clamp on metering equipment.