Research of the Effect of Displacement Primary Winding of a Measuring Current Transformer Based on the Rogowski Coil on the EMF of Secondary Winding

This article is devoted to the research of the operation of a current transformer based on the Rogowski coil. The relevance of the research topic is confirmed by the fact that this type of current transformer is a priority in automation of existing substations and the construction of digital substations, to which a gradual transition is carried out. Despite the advantages of this type of current transformer, this device has disadvantages, one of which is positional sensitivity. Using the finite element model of the transformer developed in the Femm programm, the article studies the positional sensitivity of the secondary winding EMF to the cross-sectional shape of the primary winding (bus) and its displacement relative to the center of the Rogowski coil. The research results show the need to take into account the position of the bus relative to the center of the Rogowski coil, as well as the influence of the cross-sectional shape of the bus on the EMF in the secondary winding of the current transformer.