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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Santiago, Javier [1] ; Tavares, Maria Cristina [1]
Total Authors: 2
Affiliation:
[1] Univ Estadual Campinas, UNICAMP, Sch Elect & Comp Engn, Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Electric Power Systems Research; v. 175, OCT 2019.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 15/13823-0 - MITIGATION PROCEDURE TO FAULT OVERVOLTAGES IN HALF WAVELENGTH TRANSMISSION LINES
Grantee:Javier Arturo Santiago Ortega
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/20010-1 - CONTRIBUTIONS TO VERY LONG TRANSMISSION SYSTEM AND POWER SYSTEM PROTECTION
Grantee:Maria Cristina Dias Tavares
Support Opportunities: Regular Research Grants