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Condition Assessment of Hydrogenerator Stator Bar Insulation Using Partial Discharge Measurements

Aakre, Torstein Grav; Ildstad, Erling; Hvidsten, Sverre
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URI
http://hdl.handle.net/11250/2584878
Date
2018
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  • Institutt for elkraftteknikk [1559]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
10.1109/EIC.2018.8481078
Abstract
This paper presents results from laboratory measurements of partial discharge (PD) activity in 50 cm long samples cut from the mainwall section of old hydrogenerator stator bars. All stator bars were manufactured in 1976 and samples were taken after 35 years in service from both the low and high voltage sections of the generator, as well as non-energized back-up bars. The PD activity, using a phase resolved (PRPDA) measuring system, was investigated at different test voltages up to 9.6 kV (1.5 U 0 ), frequencies and temperatures in the range 20–155 °C and 0.1-50 Hz, respectively. The service-aged and the unaged reference samples showed a clear difference in voltage frequency dependence. It was, however, not possible to distinguish between service-aged bars from high and low electric stress. The observed frequency and temperature dependences are discussed with respect to theoretical assumptions regarding possible void degradation and surface conductivity.
Publisher
Institute of Electrical and Electronics Engineers (IEEE)

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