Caracterización de descargas parciales en ranuras y por vibración presentadas en estatores de hidrogeneradores
The reliability and availability of hydro generators is highly dependent on the condition of the stator insulation, which is exposed to a combination of thermal, electrical, environmental and mechanical stresses. An unscheduled interruption of a generator in operation could jeopardize system stabili...
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| Autores principales: | , |
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| Formato: | Online |
| Lenguaje: | spa |
| Publicado: |
Universidad de Costa Rica
2021
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| Materias: | |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/ingenieria/article/view/48667 |
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| Sumario: | The reliability and availability of hydro generators is highly dependent on the condition of the stator insulation, which is exposed to a combination of thermal, electrical, environmental and mechanical stresses. An unscheduled interruption of a generator in operation could jeopardize system stability, as well as cause economic losses, so it is necessary to have condition monitoring techniques, such as on-line partial discharge measurement. A partial discharge is defined as a localized electrical discharge, which only partially joins the insulation between the conductors, accompanied by movement of charges, acoustic emission, radiation and chemical reaction, among other effects. On-line partial discharge measurement is one of the most used techniques to follow the evolution of large hydro generators. This article proposes a novel methodology to detect the failure mechanisms of partial discharges: i) in slot; and, ii) by sparks produced by vibration, showing one example using a generator in service. The methodology is based on on-line partial discharge measurement for different active power levels. The above allows finding thermal and mechanical dependencies, which are able to locate and characterize the failure mechanism. Subsequently, a series of possible root causes of each are established, and recommendations for repair. The results obtained in the tests carried out show that on-line partial discharge measurement is effective when it comes to early detection of sudden failures, and has been successfully applied in the hydro generator evaluated. |
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