Memorias de investigación
Communications at congresses:
Experience on a 362 MVA Turbogenerator pressplates cracks evolution at underexcited conditions
Year:2019

Research Areas
  • Engineering,
  • Electric engineers, electronic and automatic (eil),
  • Electric engineering

Information
Abstract
The operation of turbogenerators at underexcited conditions increases the heating in the end-core region, especially in the pressplates. The pressplates should have excellent mechanical properties but low magnetic permeability to avoid high losses due to magnetic flux, so exotic steels and irons are used for this application. This paper presents the experience on a 362 MVA turbogenerator which operates at underexcited conditions for more than ten years, always in the allowable area according to the capacity curve. In the pressplates of this machine several cracks appeared, with the risk of catastrophic failure. Although the manufacturer recommendation was to replace the cracked pressplates, the material and the cause of the cracks have been analyzed and it has been determined than in this particular case, changing the machine operation, the risk of the growth of the cracks was very low. After one year of operation under our specified operating conditions, the size of the cracks has remained the same, avoiding some months of machine overhaul.
International
Si
Congress
2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)
960
Place
Toulouse, France, France
Reviewers
Si
ISBN/ISSN
978-1-7281-1832-1
10.1109/DEMPED.2019.8864880
Start Date
27/08/2019
End Date
30/08/2019
From page
141
To page
146
Experience on a 362 MVA Turbogenerator pressplates cracks evolution at underexcited conditions
Participants

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Generación eléctrica con energía eólica
  • Departamento: Automática, Ingeniería Eléctrica y Electrónica e Informática Industrial
  • Departamento: Física Aplicada e Ingeniería de Materiales