Title :
Single line-to-ground faults on distribution systems: Effect of pre-fault voltages on fault currents
Author :
García, Felipe Hernández ; Ferraz, Renato Gonçalves ; Bretas, Arturo Suman ; Leborgne, Roberto Chouhy
Author_Institution :
Fed. Univ. of Rio Grande do Sul, Porto Alegre, Brazil
Abstract :
This paper presents a numerical study of the pre-fault operation condition effect on the short-circuit currents estimation in distribution systems using symmetrical components. A case study is presented comparing results between ATP/EMTP program and the symmetrical components method, where several loads and pre-fault conditions are considered. The results show that for unbalanced systems, the consideration of 1 pu as pre-fault voltages, can provide reasonable state estimation. Still, for balanced systems the pre-fault condition only is significant when it is used 1 pu as pre-fault voltage, and the load of the system is very high.
Keywords :
power distribution faults; power system state estimation; short-circuit currents; ATP-EMTP program; balanced systems; distribution systems; fault currents; line-to-ground faults; prefault operation condition effect; prefault voltages; short-circuit currents estimation; state estimation; symmetrical component method; Circuit faults; EMTP; Fault currents; Impedance; Load flow; Substations; Power distribution system; power systems faults; short-circuits currents; symmetrical components; unbalance;
Conference_Titel :
Power and Energy Society General Meeting, 2011 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-1000-1
Electronic_ISBN :
1944-9925
DOI :
10.1109/PES.2011.6039783
