Modified simulation of classical J-A model based on finite element simulation model of current transformer

Abstract

In order to study the transmission characteristics of Current Transformer (CT) used for measurement under the saturation operating point of iron core, the numerical model based on the classical J-A model is usually used to explore the saturation characteristics of CT. However, because the classical J-A magnetization theoretical model of Langevin function has nonmaterial understanding, it needs to be modified. Therefore, based on the discontinuity of deflection Angle of magnetic domains in magnetic physics, the universal Brillouin function is introduced in this paper, and a new hysteretic model of iron core is formed by modifying the classical J-A magnetization theory. Combined with the modified J-A hysteresis model, a single core CT finite element simulation model is established in Ansys, and the variable current transfer under different working conditions is simulated, which verifies the feasibility of the classical J-A model for correcting the route.