Relevant factors for temporary overvoltages due to fault-resonance conditions on half-wavelength transmission lines

Autor(es)

Santiago, Javier ^[1] ; Tavares, Maria Cristina ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Sch Elect & Comp Engn, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electric Power Systems Research; v. 175, OCT 2019.
• Citações Web of Science: 0

Resumo

This article explains the phenomenon of severe temporary overvoltage (TOV) due to critical faults on a very long transmission line with half-wavelength properties. Such non-conventional AC lines are an alternative to bulk power transmission over very long distances and present excellent steady-state properties. However, half-wavelength lines can present fault cases with very different natures of the voltage response due to fault-resonance conditions. The present document introduces a further explanation of these fault-resonance conditions. First, this study analyses the resonance at the fundamental frequency and analytically determines the TOV considering the fault location, the type of fault, and a simple model of system components. Coherence of major phenomena is obtained with time-domain simulation. Then, a more detailed method for analysing overvoltages on half-wavelength lines under fault conditions is presented. Here, a sensitivity analysis is implemented using PSCAD/EMTDC with more accurate models of system components. Factors such as the type of fault, sequence circuit, fault location, short-circuit level, fault resistance, loading level, transformer saturation and ground resistivity are considered. Finally, the paper interprets the impact of those factors on fault-resonance conditions and TOV. (AU)

• Processo FAPESP: 15/13823-0 - Mitigação de sobretensões produzidas por faltas em linhas de transmissão de um pouco mais de meio comprimento de onda para transporte de energia em longas distâncias.
• Beneficiário: Javier Arturo Santiago Ortega
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/20010-1 - Contribuição para estudos das alternativas para transmissão a muito longa distância e proteção de sistemas de potência
• Beneficiário: Maria Cristina Dias Tavares
• Modalidade de apoio: Auxílio à Pesquisa - Regular