Cost-effective online partial discharge measurements for electrical machines: Preventing insulation failure

Yue, Qin; Leach, C.E.

doi:10.1109/mei.2010.5585005

Cited by 2 publications

(1 citation statement)

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“…To face this problem as well as avoid measures directly attaching the insulation system of high voltage parts, natural detecting points as surge capacitors or the equivalent capacitor between bus bar and isolated phase output bus (IPB) sheath, as well as the capacitor between conductor and screen earth of cable (if existing) connecting the generator to the transformer are preferably used for access, as shown in Figure 7. A RFCT was placed on the grounding lead of these capacitors to detect PD signals [11,48,55,56]. Since these capacitors were adjacent to the bars likely to have traditional PD, much larger PD signals are expected in this location compared to the RFCT located at the neutral.…”

Section: Hv Terminal Rfct Coupling (Hvct)mentioning

confidence: 99%

A Review of Online Partial Discharge Measurement of Large Generators

Luo

Wang³

2017

Energies

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Abstract:Online partial discharge (PD) measurements have long been used as an effective means to assess the condition of the stator windings of large generators. An increase in the use of PD online measurement systems during the last decade is evident. Improvements in the detection capabilities are partly the reason for the increased popularity. Another reason has been the development of digital signal processing techniques. In addition, rapid progress is being made in automated single PD source classification. However, there are still some factors hindering wider application of the system, such as the complex PD mechanism and PD pulse propagation in stator windings, the presence of detrimental noise and disturbances on-site, and multiple PD sources occurring simultaneously. To avoid repetition of past work and to provide an overview for fresh researchers in this area, this paper presents a comprehensive survey of the state-of-the-art knowledge on PD mechanism, PD pulse propagation in stator windings, PD signal detection methods and signal processing techniques. Areas for further research are also presented.

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Section: Hv Terminal Rfct Coupling (Hvct)mentioning

confidence: 99%