| Autor: |
Julio Espinosa Domínguez, Osmel Perez Baluja, Amada Gabriela de la Cruz Conte, Carlos Sigas Martínez, Orlys Ernesto Torres Breffe |
| Jazyk: |
English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Revista Científica de Ingeniería Energética, Vol 45, Iss 1, Pp 1-11 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1815-5901 |
| Popis: |
Sequence networks make it possible to represent the elements of an electrical network during unbalanced faults, according to Fortescue's theorem presented in 1918. In the case of three-phase transformers, the equivalent sequence networks depend on the connection group of the windings and the connection of the neutral tothe ground. This paper carry out a detailed study of zero-sequence networks in power transformers, using mathematical simulation to analyze two special cases, unknown to some electrical protection specialists, in which the zero-sequence impedance can cause significant changes in short-circuit currents. The results have been obtained using theoretical and empirical methods, which have made it possible to demonstrate that transformers can behave as sources of short-circuit contribution in the presence of shunt lines. At the same time, the zero-sequence impedance is different depending on the design of the ferromagnetic core for the same connection group. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
