Transmission line model with elements of high quality factor

Abstract

This research project presents a proposal for the development of work in the level of Scientific Initiation in the area of transient electromagnetic phenomena using components of high quality factor. The proposal is to analyze the behavior of a physical model of transmission lines, based on À circuit modules, constructed during the previous year in a project of Scientific Initiation of another student and that was sponsored by PROPe / (Pro-Rectory Research Of UNESP) replacing previously employed components (common quality factor) by quality factor components. In this case, the model originally used in other research carried out at the institution should have its initial resistance adequate for a high quality factor system. The model uses single-phase representation based on modified À circuits. The classical circuit structure À does not consider the influence of the frequency, which causes significant errors in the calculations of currents and voltages propagated by the line outside the steady state situation or for high frequency phenomena. Thus, in the classical circuit structure À, parallel RL blocks are inserted to simulate the influence of the frequency on the transmission line parameters. The built physical model was based on a mathematical model developed previously, which is solved using the technique of state variables in conjunction with the numerical method of trapezoidal integration. The results of this mathematical modeling were compared with results obtained by the main computational programs of transient simulation in electrical networks. In previous works, the À circuit unit was assembled, frequency sweep being performed to obtain the resistance and inductance curves of the longitudinal branch of a À circuit unit. The frequency range used for the scanning was between 10 Hz and 1 Mhz. In this work these components will be replaced by components with high quality factor. (AU)