Interferência eletromagnética entre um cabo de baixa tensão e um cabo de sinal em par trançado

Abstract

Due to the great importance of the phenomenon "crosstalk" – na unintentional coupling between two conductors, the fact of being twisted pair cable type the most used in the transmission of data signals, and also the lack of existing literature on this subject, this course conclusion work presents a study of electromagnetic interference on a twisted pair signal cable generated by a low voltage supply conductor, which is in proximity. Based on a theoretical framework that contains an extensive and complex mathematical equation, which is presented in the first chapters, a software was developed to perform various simulations with changes in the input parameters of the program, referring to the distances between the conductors and some characteristics of the circuits involved, as voltages and resistances. The results are presented sequentially in the form of graphs and values of voltages at the terminals receiver circuit as a function of time and frequency, which quantify the level of interference. Subsequently, in order to obtain an overview of an actual case, a study is conducted in an industrial sensor, in order to check that the values obtained by the program impair or not the signal integrity.