| Full text | |
| Author(s): |
Asorza, J. E. Guevara
;
Colqui, J. S. Leon
;
Pissolato Filho, J.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Electric Power Systems Research; v. 251, p. 8-pg., 2026-02-01. |
| Abstract | |
This paper presents a technical evaluation of using top wires (TW) and multiple underbuilt wires (UW) to improving the backflashover rate of a typical 220 kV transmission line installed over high-resistivity soil (5000 Omega.m). The study first assesses the impact of installing UWs across several spans, which proved to be ineffective in significantly reducing overvoltages on the insulator string. To address this inefficiency, two alternative solutions were considered: install multiple UWs, as a bundle, and another, proposed in this work, that combines TWs and UWs. Both strategies reduced the impact area and the number of affected towers, with the combined approach demonstrating superior performance. Additionally, increasing the UW cross-section had a negligible effect on overvoltage reduction while introducing unnecessary structural stress and in contrast, increasing the TW cross-section significantly improved performance in mitigating overvoltages. These findings highlight the effectiveness of combining TWs and UWs as a more robust solution for enhancing the lightning performance of transmission lines, particularly in high-resistivity soil conditions. (AU) | |
| FAPESP's process: | 21/11258-5 - Engineering Research Center for the Aerial Mobility of the Future (ERC-AMF) |
| Grantee: | Domingos Alves Rade |
| Support Opportunities: | Research Grants - Applied Research Centers Program |
| FAPESP's process: | 24/14472-6 - Lightning study in mixed overhead-underground transmission lines using rigorous formulations for computing earth-return parameters. |
| Grantee: | Jesus Enrique Guevara Asorza |
| Support Opportunities: | Scholarships abroad - Research Internship - Master's degree |
| FAPESP's process: | 23/05066-1 - Study of transient overvoltages in underground and submarine transmission lines considering rigorous models for calculating ground-return parameters |
| Grantee: | Jesus Enrique Guevara Asorza |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 21/06157-5 - Statistical study of overvoltages due to maneuvers in the EAT transmission lines considering the freqency dependence of the electrical parameters of the soil |
| Grantee: | Jaimis Sajid Leon Colqui |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |