Um Método de Localização de Faltas em Sistemas de Distribuição Baseado em Medições Fasoriais e Busca Exaustiva: Análises de Sensibilidade a Erros de Medições

Carla F. Cavalari; João Pedro B. da Silva; Débora R. R. P. Araujo; Leandro R. Araujo

doi:10.20906/CBA2022/3535

Carla F. Cavalari Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora
João Pedro B. da Silva Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora
Débora R. R. P. Araujo Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora
Leandro R. Araujo Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora

DOI: https://doi.org/10.20906/CBA2022/3535

Keywords: High impedance fault, Fault location, Measurement errors, Distribution systems

Abstract

Localization of high impedance faults (HIFs) is a difficult task in power distribution systems, since the fault currents are of small magnitude, making conventional protection equipment incapable of detecting them. As a solution to the problem of locating FAIs, this work presents a method based on exhaustive search that relates system state variables with phasor measurements of network voltage and current made by PMUs (phasor measurement units). However, errors and uncertainties in the measurement data can compromise the accuracy of the data. Due to this, the algorithm that locates the approximate distance of the fault was submitted to input data with errors of different amplitudes obtained from the measurements of the PMUs and in uncertainties in the estimation of the load, in order to represent the system data with greater fidelity. The method was tested with the IEEE 34 bus system for phase-to-ground faults and proved to be robust to the influence of measurement errors.