Evaluation of Mixed Systems for Sheath Bonding of Single-Circuit Underground Power Lines

Author(s)

Guevara, Jesus E. ; Flores Ruiz, William Gonzalo ; Leon Colqui, Jaimis Sajid

• Document type: Journal article
• Source: SOUTHEASTCON 2024; v. N/A, p. 6-pg., 2024-01-01.

Abstract

This paper investigates and presents the application of mixed systems for sheath bonding in single-circuit underground transmission lines, considering both triangular and flat formations. The employed mixed systems included methods such as sectionalized cross-bonding (SCB) along with single-point bonding (SPB), as well as continuous cross-bonding (CCB) combined with single-point bonding (SPB). Additionally, the extension of SCB for two minor section, known as midpoint (MP), also was considered, offering alternative approaches to sheath bonding beyond SCB and CCB. These mixed systems are utilized when the induced voltage on the sheath exceeds the maximum limit set by employing solely SCB or CCB methods. The analysis demonstrates that rather than increasing three smaller sections for a new SCB or CCB connection, the mixed system requires only one for single-point bonding or two for mid-point bonding. This results in fewer joint boxes, reduced costs, and shorter durations for civil and electromechanical works. (AU)

• 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
• 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: 23/11009-0 - Analysis of transient overvoltage performance in HV and EHV transmission lines considering the corona effect, pollution in the insulator string, and lines installed at high altitudes
• Grantee: Jaimis Sajid Leon Colqui
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor