Analysis of overvoltages across line insulator str... - BV FAPESP
Advanced search
Start date
Betweenand


Analysis of overvoltages across line insulator strings considering the ground-wire and phase conductors corona✰

Full text
Author(s):
Pereira, T. M. ; Alipio, R. ; Tavares, M. C.
Total Authors: 3
Document type: Journal article
Source: Electric Power Systems Research; v. 223, p. 7-pg., 2023-10-01.
Abstract

This paper assesses the influence of corona effect on the overvoltages developed across the insulator strings of overhead transmission lines due to lightning. The influence of corona is investigated considering lightning strikes to the tower top and shielding wires at midspan. A large range of soil resistivity and lightning currents peaks are evaluated in the analysis, and the stress across the insulator strings is evaluated applying the integration method. Simulations are carried out in the Alternative Transient Program (ATP/EMTP), wherein the corona effect is represented through the accurate Suliciu corona model, which was implemented using the MODELS interface and combined with J. Marti line model. Furthermore, it was also represented the wideband behavior of tower grounding system. Results showed that corona effect has a minor influence in the overvoltages across the insulator string for strikes to the tower top. However, it strongly influences the overvoltages across line insulators ensuing from a lightning strike to the shielding wire at the midspan, leading to a decrease in the peak value of the lightning current that causes line flashover. (AU)

FAPESP's process: 22/01896-7 - Contributions to electromagnetic transients in power systems focusing on sustainable development goal 07
Grantee:Maria Cristina Dias Tavares
Support Opportunities: Regular Research Grants
FAPESP's process: 19/20311-7 - Development of a new model to represent polyphasic transmission lines in Electromagnetic Transients Programs (EMT)
Grantee:Thassio Matias Pereira
Support Opportunities: Scholarships in Brazil - Doctorate