Title :
Calculation of lightning flashovers on distribution lines
Author :
De Conti, Alberto ; Campos, Arthur F M ; Silveira, Fernando H. ; Lima, José Luís Cerqueira ; Costa, Sérgio Edmundo
Author_Institution :
LRC - Lightning Res. Center, UFMG - Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil
Abstract :
This paper presents an analysis of lightning-induced voltages on distribution lines considering insulation breakdown. Critical flashover overvoltages (CFOs) and volt-time curves of 15-kV and 25-kV class, pin-type porcelain insulators are determined from experimental tests with both standard and non-standard voltage waveforms. The tests are performed for configurations that are representative of medium-voltage distribution lines. Parameters are derived for application in the integration method, which is intended to model insulator performance due to non-standard voltage waveforms. The obtained parameters are used in computer simulations that show the influence of insulation breakdown on lightning-induced voltages considering different flashover criteria. The obtained results suggest the importance of an accurate flashover modeling for a correct assessment of lightning overvoltages in distribution systems.
Keywords :
flashover; lightning; overvoltage; porcelain insulators; power distribution lines; computer simulation; flashover modeling; insulation breakdown; integration method; lightning flashover overvoltage; lightning induced voltage; medium-voltage distribution line; model insulator performance; nonstandard voltage waveform; pin-type porcelain insulator; volt-time curve; Breakdown voltage; Flashover; Insulators; Lightning; Surges; flashover models; insulation breakdown; lightning-induced voltages;
Conference_Titel :
Lightning Protection (XI SIPDA), 2011 International Symposium on
Conference_Location :
Fortaleza
Print_ISBN :
978-1-4577-1898-4
DOI :
10.1109/SIPDA.2011.6088446
