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Partial discharge

About: Partial discharge is a research topic. Over the lifetime, 13997 publications have been published within this topic receiving 102058 citations. The topic is also known as: PD.


Papers
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Journal ArticleDOI
TL;DR: In this article, a research project was started focused on the measurement and interpretation of PD signals obtained under DC stress using IEC60270 and unconventional methods through UHF antenna and high frequency current transformer (HFCT).
Abstract: Partial discharge (PD) measurements are commonly used for monitoring and diagnostics of AC gas insulated systems (GIS). Because of the growing importance of DC GIS, a research project was started focused on the measurement and interpretation of PD signals obtained under DC stress. Results are presented using IEC60270 and unconventional methods through UHF antenna and high frequency current transformer (HFCT) on three different PD generating defects in a GIS chamber. The results of the PD analysis of the defects are compared for AC and DC stress. Phase resolved partial discharge patterns (PRPD) are used for the HVAC analysis, whereas time resolved partial discharge patterns (TRPD) are used for HVDC analysis. Finally, relevant characteristics of PD patterns in HVAC and HVDC are presented and related with the physical phenomena of the discharges.

61 citations

Journal ArticleDOI
TL;DR: In this paper, a planar configuration of discharge cell: metal electrode - dielectric plate (1 mm thick) - discharge gap (1.5 mm thick), and a fine metal mesh was placed.
Abstract: The atmospheric pressure glow discharge (APGD) is a new type of the discharge discovered by OKAZAKI et al. [1] recently. The APGD can be used in practical application (e.g. ozone generation), but the phenomena occurring in the discharge are not fully understood. We studied the APGD driven at 50 Hz, applied voltage up to 5 kV and burning in helium, argon and nitrogen. We used a planar configuration of discharge cell: metal electrode - dielectric plate (1 mm thick) - discharge gap (1.5 mm thick) - dielectric plate - metal electrode. Between the metal electrode and the dielectric plate a fine metal mesh was placed. For each gas we recorded the time dependence of power supply voltage and the time dependence of charge transferred through the discharge. We recorded also the discharges by the CCD camera with a video recorder. The same measurements were done in case of the discharge cells without the metal mesh. The metal mesh changes the discharge significantly. In the case of discharge cell with the mesh we can observe a homogeneous discharge and only one peak in the discharge current per half cycle of applied voltage while in the case of the discharge without mesh we observed individual micro-discharges and many pulses in the current per half cycle. This effect is most obvious in helium. In order to explain the observed phenomena we calculated the electric field in the discharge cell for APGD and propose a possible explanation of APGD. It has been found that the mesh does not influence the electric field in the discharge gap. Thus we propose that the mesh could influence the discharge by its electrical resistance, which is higher than the resistance of the metallic electrode.

61 citations

Journal ArticleDOI
TL;DR: In this article, a review of the methods that can reduce the risk of false indications, thus making the measurement less subjective, is presented, and compared with a table that provides an objective means of determining the stator-insulation condition relative to other similar machines.
Abstract: Partial-discharge (PD) measurements have long been used to assess the condition of the electrical insulation in motors and generators rated 3.3 kV and above. There are many ways to measure PDs during normal service of the motor or generator. Unfortunately most of the measurement methods mix stator PD with electrical-interference signals from poor electrical connections, power tool operation, corona from transmission lines, etc. The result can be false indications of stator-winding problems, reducing confidence in PD measurements. Another issue with online PD testing is interpretation, i.e., identifying which machines are in good condition and which machines need maintenance. In the past decade, a database of over 60 000 test results has been assembled. In hundreds of machines, the condition of the insulation determined by a visual inspection has been compared to the PD levels. The result is a table that provides an objective means of determining the stator-insulation condition relative to other similar machines. An analysis of the results also shows that there are significant differences in PD activity between manufacturers. This paper gives a review of the methods that can reduce the risk of false indications, thus making the measurement less subjective.

61 citations

Patent
21 Jul 1989
TL;DR: In this article, a method and device for detecting a partial discharge pulse in a high voltage conductor in the stator of a motor, turbine generator or a like, comprising a conductive plate having an insulated face, an insulated signal conductor spanning the insulated face of the plate, and means for transmitting an electrical pulse produced in the signal conductor to recording means for determining the location and severity of partial discharge activity within the high voltage insulation of the conductor.
Abstract: A method and device for detecting a partial discharge pulse in a high voltage conductor in the stator of a motor, turbine generator or the like, comprising a conductive plate having an insulated face, an insulated signal conductor spanning the insulated face of the plate, and means for transmitting an electrical pulse produced in the signal conductor to recording means for determining the location and severity of partial discharge activity within the high voltage insulation of the conductor.

61 citations

Journal ArticleDOI
TL;DR: In this paper, a magnetic compression solid-state pulsed power generator was used to produce repetitive nanosecond pulses for the excitation of dielectric barrier discharge (DBD) using two liquid electrodes.
Abstract: Dielectric barrier discharge (DBD) excitation by unipolar high voltage pulses is a promising approach for producing non-thermal plasma at atmospheric pressure. In this study, a magnetic compression solid-state pulsed power generator was used to produce repetitive nanosecond pulses for the excitation. The DBD is created using two liquid electrodes. The electrical characteristics of the discharge voltage and current are illustrated under different experimental conditions. The nanosecond-pulse discharge current is of the order of tens of amperes. This differs from common DBD current excitated by high-voltage ac sources. Compared with the characteristics of two current pulses corresponding to two discharges for unipolar pulsed-excitation, the secondary discharge in this study is minor owing to the pulsed power and discharge configuration. Under the experimental conditions, the luminous emissions from the front and side views of the liquid electrodes show that no filament is observed and the discharge is homogeneous and diffuse in the whole discharge region. The effects of applied voltage amplitude, repetition rate, and air gap spacing on the discharge characteristic are investigated. The discharge mode does not change with the variation of the investigated parameters. A comparison of high voltage ac and nanosecond-pulse excitation is also presented. In addition, discussion of the experimental results is presented.

61 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023306
2022780
2021376
2020677
2019835
2018860