System unbalance effect on faulted distribution systems: A numerical study

Author

Ferraz, Renato Gonçalves ; Cabral, Roberto Jose ; Bretas, Arturo Suman ; Bazanella, Alexandre Sanfelice ; Leborgne, Roberto Chouhy

Author_Institution

Fed. Univ. of Rio Grande do Sul, Porto Alegre, Brazil

fYear

2010

fDate

25-29 July 2010

Firstpage

1

Lastpage

6

Abstract

This paper presents a numerical study of the system unbalance effect on system voltage and current calculation during asymmetrical faults. Two different system operational conditions are tested considering a voltage imbalance at the substation bus: balanced system loads and voltage imbalance equal to 3.65% due to system loads. Five fault impedances are simulated. Two fault analysis methods, the symmetrical components and phase component algorithms are implemented and analyzed based on numerical simulations of asymmetrical faults on the IEEE 13 bus test feeder. The results show the accuracy of each fault analysis method and how the errors may vary according to the system pre-fault unbalance operation condition and the fault impedance.

Keywords

fault location; numerical analysis; power distribution faults; substations; fault analysis methods; faulted distribution systems; numerical simulations; phase component; substation bus; symmetrical components; system unbalance effect; voltage imbalance; Distribution systems; phase components; symmetrical components; unbalanced operation;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting, 2010 IEEE

Conference_Location

Minneapolis, MN

ISSN

1944-9925

Print_ISBN

978-1-4244-6549-1

Electronic_ISBN

1944-9925

Type

conf

DOI

10.1109/PES.2010.5590132

Filename

5590132