Caracterização dos problemas relativos à qualidade de energia elétrica causados por um forno de aquecimento a indução

Abstract

By presenting energy-efficient, high heating rate, low level of oxidation of the material processed, low emission of dust, noise and fumes and provide a better working environment and easy control of the production process, induction heating has become a solution increasingly viable in the steel sector. The same elements in the area of power electronics that made possible the extensive use of inductive heating are also responsible for significant problems within the electric power quality, and that is the field in which this paper focuses. This paper presents a theoretical initially contextualizing and providing information about the heating furnace induction, and then, addressing aspects of power quality. Furthermore, the theoretical addressed the technical norms regarding the indices of electricity quality. The next step involved measurements and verifications in a heating furnace induction to identify and quantify the problems of power quality gifts. From these measurements, the data were organized in the form of charts and / or tables, and from there it was possible to reach conclusions. First it was found that the problems of power quality present in the induction heating furnace are mainly harmonic distortions. Note that the harmonic voltage distortion is not present so striking in the general context. Thus, it was found that the harmonic distortions are more present current harmonics of order 6n±1.