Transformador de corrente com núcleo toroidal composto por liga de FeSi e liga nanocristalina: fundamentação analítica e simulação computacional baseada no método dos elementos finitos.

Abstract

Current Transformers (CT) are Instrument Transformers (IT), specially manufactured for the use in electrical systems with the purpose of measurement, control or protection. In the analytical studies of these instruments, the theoretical foundation is based on the fundamental laws of electromagnetism derived from Maxwell's equations and on the equivalent magnetic circuits obtained from the magnetomotive forces, reluctances and magnetic fluxes. In this work are used computational simulations based on the finite element method to obtaining the magnetic induction distribution inside the toroidal core. From these simulations, it was possible to verify that the magnetic induction is distributed in an unequal way in the radial direction of the toroidal core. Thus, in this work are presented analytical studies and computational simulations of CT with toroidal core of magnetically soft material with FeSi and nanocrystalline alloy and a composite core with the union of these two materials.