| Full text | |
| Author(s): |
Asorza, J. E. Guevara
;
Rojas, R. E.
;
Filho, J. Pissolato
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Electric Power Systems Research; v. 251, p. 7-pg., 2025-09-19. |
| Abstract | |
This paper evaluates the impact of using approximate versus exact internal impedance formulations in Overhead Transmission Lines (OHTL), focusing on Half-Wavelength Transmission lines (HWTL) and high-surge impedance loading applications, where multiple conductors per phase are employed. Approximate formulations for the internal impedance of conductors simplify calculations but may introduce minor errors that, in specific applications, can become more significant. These inaccuracies affect key parameters, including active power transfer, surge impedance loading (SIL), and Joule losses, and can also compromise the accuracy of transient analysis. The study compares approximate and exact impedance formulations under steady-state and transient conditions across three OHTL configurations of varying designs. Results reveal that approximate formulations reduce accuracy in SIL and voltages calculations, resulting in potential power transfer limitations and increased voltage drops. Furthermore, a statistical analysis of switching manoeuvres demonstrates that the approximate model predicts higher overvoltages than the exact formula, with phase C exhibiting the most significant deviations. These findings underscore the critical importance of precise internal impedance modelling in HWTL studies to ensure reliable power system analysis. (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 |