A Maintenance Inspection Program for Large Rotating Machines

Johnson, J. S.

doi:10.1109/t-aiee.1951.5060472

Cited by 23 publications

(2 citation statements)

References 7 publications

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“…Typically, the expected lifetime of generators, like other high-voltage equipment, is determined mainly by the condition of its insulating system [1]. The last 60 years have seen many studies conducted in attempts to understand and identify the degradation mechanisms of the stator insulation system [2]. For a long time, partial discharge (PD) measurements have been recognized being a powerful tool to carry out diagnosis of generators.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface degradation on slot partial discharge activity

Lévesque

David

Hudon

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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To improve our understanding of slot partial discharge (PD) mechanisms, an accelerated aging test was initiated two years ago. This long-term experiment is being performed on six stator bars subjected to slot PDs under electrical, thermal and mechanical stresses. It is well known that slot PD activity in air-cooled generators is harmful to the stator winding ground insulation. The degradation induced by slot PDs will modify the physical properties of the surfaces of the cavity where PDs take place and this in turn will influence the slot PD process. To understand the evolution of slot PD activity and the changes in its PRPD (Phased Resolved Partial Discharge) pattern, it is therefore essential to recognize and understand the interdependence between surface modifications and PD signals. This paper presents results of visual observations of stator bar surface degradation, changes in surface conductivity and the effect on the evolution of PD signals in the presence of slot PD activity under conditions of electrical, thermal and mechanical stresses.

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Section: Introductionmentioning

confidence: 99%

Effect of surface degradation on slot partial discharge activity

Lévesque

David

Hudon

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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“…However, as more exposed than neutral to noise from transformer and power system, extra noise suppression might be necessary for HV terminal detecting methods. Kurtz et al [49] modified the off-line test system described by Johnson [50] by replacing the large coupling capacitor with an appreciably smaller one of about 80 pF connected with a resistive detection impedance, which was the predecessor of the subsequent PD analyzer (PDA), i.e., HVCC. PDA includes differential and directional modes.…”

Section: Hv Terminal Detecting Methodsmentioning

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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Prüfung und Überwachung der Wicklungsisolation

Wichmann¹

1973

Herstellung Der Wicklungen Elektrischer Maschinen

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A Maintenance Inspection Program for Large Rotating Machines

Cited by 23 publications

References 7 publications

Effect of surface degradation on slot partial discharge activity

Effect of surface degradation on slot partial discharge activity

A Review of Online Partial Discharge Measurement of Large Generators

Prüfung und Überwachung der Wicklungsisolation

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