A Performance Analysis of a Hydrogenerator In The Case of Field Short-Circuit Using FEM

Authors

  • S.E.Dallas Author
  • A.N.Safacas Author
  • J.C. Kappatou Author

DOI:

https://doi.org/10.24084/repqj09.418

Abstract

The  maintenance  of  synchronous  generators  is  very  significant  for  the  energy  production.  Being  aware  of  the  performance  of  a  synchronous  machine  during  different  kinds  of faults, such as phase to phase, phase to ground or field short-circuits, could provide useful information about their protection. A short-circuit in the field excitation is not a common fault, but it  is  severe  enough  to  create  high  oscillations  to  both  electrical  and  mechanical  magnitudes  (field,  stator  and  damper  currents,  rotor  shaft  torque,  load  angle  etc).  Such  kind  of  faults  is  difficult to examine and provide experimental results because of the  kinds  of  generator  used  for  energy  production.  The  size  of  these  machines,  either  hydrogenerator  or  turbogenerator,  is  enormous    for    experimental    laboratory    studies.    Another    important  issue  that  arises  is  the  difficulties  in  the  accurate  calculation  of  the  damper  currents  during  transient  operation.  The Finite Element Method analysis gives solution to this kind of  problems,  as  it  can  calculate  as  well  the  damper,  stator  and  field currents as the electromagnetic field distribution inside the air gap.

Author Biographies

  • S.E.Dallas

    1 Department of Electrical and Computer Engineering

    University of Patras

    Rion – Patras 26500 (Greece)

    Phone/Fax number: +302610996415/+302610997362, e-mail: sdallas@ece.upatras.gr

  • A.N.Safacas

    Department of Electrical and Computer Engineering

    University of Patras

    Rion – Patras 26500 (Greece)

    Phone/Fax number: +302610996415/+302610997362, e-mail: A.N.Safacas@ece.upatras.gr

  • J.C. Kappatou

    Department of Electrical and Computer Engineering

    University of Patras

    Rion – Patras 26500 (Greece)

    Phone/Fax number: +302610996415/+302610997362, e-mail: joya@ece.upatras.gr

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Published

2024-01-17

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Articles