Overvoltages in a 400 kV Transmission Line with Y-shaped Composite Pylon: Impact of Line Parameter Calculation Formulations

Autor(es)

Colqui, Jaimis S. Leon ; Asorza, Jesus E. Guevara ; Filho, Jose Pissolato ; Zhang, Hanchi ; da Silva, Filipe Faria ; Bak, Claus Leth

• Tipo de documento: Artigo Científico
• Fonte: 2024 IEEE URUCON; v. N/A, p. 5-pg., 2024-01-01.

Resumo

This paper assesses the impact of employing two distinct formulations, derived from different definitions for the overhead conductor voltages, in calculating transmission line parameters for assessing lightning-induced overvoltages in overhead lines installed on a composite material transmission tower featuring a Y-shaped composite pylon. One of the formulations uses Pettersson's equations, which are based on the definition of voltage on conductors, providing a physically more consistent approach. While the other formulation uses Carson's equations, which are based on the definition of potential on conductors, offering a physically less consistent approach, this latter formulation is typically used in EMT-type programs. The results reveal significant differences between the physically more consistent formulation and those typically employed in EMT-type programs when comparing lightning-induced overvoltages in overhead lines installed on a Y-shaped pylon. These differences become more pronounced with increasing soil resistivity and may be crucial in determining occurrences of backflashover on the line. (AU)

• Processo FAPESP: 23/11009-0 - Análise do desempenho de sobretensões transitórias em linhas de transmissão de alta e extra alta tensão, considerando o efeito corona, poluição nas cadeias de isoladores e linhas instaladas em altitudes elevadas
• Beneficiário: Jaimis Sajid Leon Colqui
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 23/05066-1 - Estudo das sobretensões transitórias em linhas de transmissão subterrâneas e subaquáticas considerando modelos rigorosos do cálculo dos parâmetros de retorno do solo
• Beneficiário: Jesus Enrique Guevara Asorza
• Modalidade de apoio: Bolsas no Brasil - Mestrado