Evaluation of partial discharge detection techniques on hydro-generators in the Australian Snowy Mountains scheme. Tumut 1 case study

Simpson, John; Tychsen, R.C.; Su, Qi; Blackburn, T.R.; James, R.E.

doi:10.1109/60.372564

Cited by 10 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both authors conclude that the attenuation is much larger for higher than for lower frequencies. This is not only for turbine generators, but also for hydro generators; comparable results were found and in [14], it is shown that the time delay between the fast mode and the slow mode can be used to locate a discharge. It is interesting to note that there is little difference in results, despite the huge differences in stator design.…”

Section: A Analysis Of the "Slow Mode" And The "Fast Mode"supporting

confidence: 65%

“…In 1983, Timperley showed that several types of incipient insulation failures generate travelling waves in a stator winding, and that their frequency characteristics depend on the origin of the defect [8]. Several authors report impulse response tests on stator windings; examples can be found in [9]- [14]. It is reported that a PD pulse essentially propagates as a travelling wave and that the stator winding can be regarded as a transmission line.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Propagation of Partial Discharge Signals in Stator Windings of Turbine Generators

Pemen

Laan

Leeuw

2006

IEEE Trans. On Energy Conversion

View full text Add to dashboard Cite

Abstract-We studied the propagation of partial discharge pulses in a stator winding by means of measurements on a dismantled 35-MW generator and found that a stator winding acts as a transmission line. Therefore, a partial-discharge (PD) signal manifests itself at the generator terminals after a transit time that depends on the location of the discharge. Due to capacitive and inductive couplings in the end-winding region, a second propagation mode is present for higher frequencies. This "fast mode" manifests itself at the terminals without appreciable time delay. The capacitive and inductive couplings also cause crosstalk between the phases. As a consequence, a signal measured in one phase does not necessarily originate from a discharge in that phase. The amplitudes of the fast mode and, to a lesser extent, the slow mode (or transmission-line mode) are heavily damped when the discharge occurs further away from the measuring terminal. The consequence is that only discharges close to the measuring terminal can be observed. The propagation of a PD signal is not only influenced by the construction of the generator but also by its external connections.

show abstract

Section: A Analysis Of the "Slow Mode" And The "Fast Mode"supporting

confidence: 65%

mentioning

confidence: 99%