Investigation into the possibility of partial discharge damage in a synchronous generator supplying a thyristor bridge load

G. Reid, J. Hiley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The loading of a small synchronous generator with a thyristor bridge causes harmonic currents to flow in its windings. This can lead to an increase in the generator's working temperature. This temperature increase promotes additional thermal stressing of the machine, and acts to lower the partial discharge (PD) inception and extinction voltages of its insulation system. The use of a thyristor bridge also produces notches in the generator phase to neutral and line to line voltage waveforms, the leading edge of which are sufficiently fast fronted to cause a non-linear distribution over the phase winding. Furthermore, the use of thyristor snubbers can produce an oscillating overvoltage at the trailing edge of the notch. It has been suggested that these overvoltages and fast fronted transients may produce PDs in the generator insulation, possibly leading to damage and premature failure. This paper details a laboratory investigation into the PD performance of the insulation in a 16kVA. three phase synchronous generator when loaded with a thyristor bridge.

Original languageEnglish
Title of host publication39th International Universities Power Engineering Conference, UPEC 2004
Pages732-736
Number of pages5
Volume2
Publication statusPublished - 2004
Event39th International Universities Power Engineering Conference - Bristol, United Kingdom
Duration: 6 Sep 20047 Sep 2004

Conference

Conference39th International Universities Power Engineering Conference
Abbreviated titleUPEC 2004
CountryUnited Kingdom
CityBristol
Period6/09/047/09/04

Keywords

  • Insulation
  • Non-Linear Load
  • Partial Discharge
  • Synchronous Generator

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