Contributions on corona onset voltage calculation for EHV and UHV substation connectors

• Autores: Joan Hernández Guiteras
• Directores de la Tesis: Jordi-Roger Riba Ruiz (dir. tes.), José Luis Romeral Martínez (codir. tes.)
• Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2014
• Idioma: inglés
• Tribunal Calificador de la Tesis: Andrea Cavallini (presid.), Joan Bergas Jané (secret.), Saïd Lalaouna (voc.)
• Materias:
  • Física
    • Electromagnetismo
      • Electricidad
    • Electrónica
      • Transporte de electrones
    • Física del estado sólido
      • Dieléctricos
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• Resumen

  • Research conducted within this thesis was performed in the framework on industry university research agreement. The objective of this research is to determinate the corona onset voltage in non-uniform geometries to avoid corona appearance to feasibly assist the design phase of EHV and UHV substation connectors and installed hardware under operating conditions, according to international standards. Thus, it has been deserved a special consideration to the study and modelling of corona effect to ensure that the designed connectors are almost free of this undesirable effect. Due to the nature of this partnership, the scientific research has been constrained to applicability in industrial environment and to overcome international standardization of the analyzed products.

    Thus, topics covered in this research include electromagnetic field analysis and corona effect calculations, being the latter of paramount importance when designing EHV and UHV substation connectors. It is the aim of this thesis to provide an understanding and appropriate mathematical methods to evaluate the dielectric performance of substation connectors for EHV and UHV transmission systems. Specifically, an introductory chapter to the state of the art of substation connectors and corona effect is detailed, followed by a chapter devoted to cover electric and magnetic fields created by substation connector and empirical corona onset conditions when air is not modeled. Then, a macroscopic description of corona through mathematical description of ionization process is addressed in steady and transient states. Latter, a microscopic description through gas statistics is used to describe and calculate corona ionization parameters for electrons in air. Finally, a closure chapter with main contributions of this research is found.