Interface gráfica para avaliação de saturação em transformadores de corrente - TPY

Abstract

This paper presents a study of saturation of current transformers (CTs) systems in electrical power systems through the development of a graphical interface via Visual Studio in C#. At first, a brief explanation of the operation of a current transformer is observed, taking into account the standards IEC 60044-6 and IEC 61869-2. The problems that saturation of the current transformer core can bring to the electrical system in which it is installed were explained. With this, the development of the graphical interface that allows an analysis of the saturation of the CTs core, through simulations for different conditions of three- phase and single-phase short-circuit levels, load variations according to CT data, as well as the impedances connected to the secondary. In this way, it is possible to observe the magnitude of the voltage in the secondary and compare it with the appropriate levels in standards, thus being able to conclude whether or not there was or was not saturation of the current transformer core. A developed interface is shown to be satisfactory, bringing the user practicality in the analysis of current transformer saturation, which can be used by students and professionals in the field of electrical systems protection.