| Full text | |
| Author(s): |
Asorza, Jesus E. Guevara
;
Colqui, Jaimis S. L.
;
Pissolato Filho, Jose
;
da Silva, Filipe Faria
;
Bak, Claus Leth
Total Authors: 5
|
| Document type: | Journal article |
| Source: | Electric Power Systems Research; v. 238, p. 12-pg., 2024-10-15. |
| Abstract | |
Renewable energy parks rely on underground cables arranged in trefoil formations to connect to the substation. However, challenges arise due to high soil thermal resistivity, which can limit cable capacity. Increasing the number of circuits in a trench exacerbates this issue, leading to the cables transmitting the rating current at a temperature higher than the manufacturer's recommended, and in this way, the cable lifespan is reduced. In order to address these challenges, the cross-bonding method can be applied to mitigate joule losses by balancing the induced voltage on the cable sheath. While traditionally used in high-voltage systems, cross- bonding has found widespread application in medium-voltage environments, including wind and solar parks. This paper investigates the impact of increasing the number of circuits within a trench on induced voltage variations across the cable sheaths. This analysis employs up to seven circuits in a trefoil configuration within the trench. Additionally, precise formulations are used to calculate the earth-return impedance of cables. The results reveal that while augmenting the number of circuits improves the induced voltage performance, it adversely affects ampacity. These findings provide valuable insights for improving electrical design practices in wind parks and similar. (AU) | |
| 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 |