Access impedance in Brazilian in-home, broadband and low-voltage electric power grids

Abstract

This paper focuses on the measurement, characterization and modeling of the access impedance of the Brazilian in-home, broadband and low-voltage electric power grids when the frequency band between 2 and 500Hz is taken into account. Also, it describes the measurement setup and the settings of a large measurement campaign that was carried out on several kinds of facilities in three different Brazilian cities. In addition, it presents a procedure to obtain a statistical model of the access impedance in the aforementioned frequency band. Then, based on the analysis of the measured access impedances and well-known criteria for choosing statistical models, this study suggests statistical distributions to model the resistance and reactance components of the access impedance. Also, it is shown that the access impedance is a nonstationary random process in the frequency domain. Furthermore, because of this property, this paper introduces a simple and effective model to generate sample functions, based on the suggested statistical distributions.