Journal ArticleDOI
Residual charge density distribution measurement of surface leader with feedback electrostatic probe
TLDR
In this article, a two-layer structure pipe is designed to lower the surface potential after leader discharge, and the residual surface charge density distribution under 23.5kV application voltage is given, and numerical characteristics of residual charge in the leader channel and streamer channel are analyzed.Abstract:
A charge density distribution scanning system is fabricated using an electrostatic probe, which utilizes DC voltage feedback principle to nullify the electric field between the probe and charged insulator surface. A two-layer structure pipe is designed to lower the surface potential after discharge. In this way, the surface potential distribution caused by the residual charge of leader discharge under the impulse application voltage up to 40 kV can be measured. In this Letter, the residual surface charge density distribution under 23.5 kV application voltage is given, and the numerical characteristics of residual charge in the leader channel and streamer channel are analyzed.read more
Citations
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Effects of surface roughness on surface charge accumulation characteristics and surface flashover performance of alumina-filled epoxy resin spacers
Jianyi Xue,Han Wang,Junhong Chen,Li Kefeng,Yan-Qin Liu,Bai-Peng Song,Junbo Deng,Guan-Jun Zhang +7 more
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The regulation mechanism of SiC/epoxy coatings on surface charge behavior and flashover performance of epoxy/alumina spacers
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Surface charge transport behavior and flashover mechanism on alumina/epoxy spacers coated by SiC/epoxy composites with varied SiC particle size
Journal ArticleDOI
Inversion Algorithm to Calculate Charge Density on Solid Dielectric Surface Based on Surface Potential Measurement
TL;DR: The 2-D Fourier transform and Wiener filter techniques are employed in the algorithm for shift-invariant system thus the relationship between potential and charge density can be processed in spatial frequency domain, which tremendously simplifies the conventional procedure.
Journal ArticleDOI
Enhancing flashover performance of alumina/epoxy spacers by adaptive surface charge regulation using graded conductivity coating.
TL;DR: This study reports surface charging behavior and flashover performance on alumina/epoxy spacers with different surface conductivity graded coating (SCGC) schemes in SF6/N2 mixtures under DC stress and reveals a transition of surface charge dominant mechanism from bulk conductivity model to surface Conductivity model with the increase of conductivity on coated area.
References
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Journal ArticleDOI
The mechanism of leader breakdown in electronegative gases
TL;DR: In this article, a survey of the current state of understanding of leader breakdown of electronegative gases in nonuniform field gaps and under fast-rising voltage waveforms is given.
Journal ArticleDOI
High resolution measurements of surface charge densities on insulator surfaces
D.C. Faircloth,N.L. Allen +1 more
TL;DR: The uses and limitations of the electrostatic probe for the measurement of charge densities on insulating surfaces are discussed in this article, where two important limitations have together been overcome: (i) the effects on the probe signal of charges on all points of the surface have been taken into account by means of a matrix inversion procedure; and (ii) a robotic control system has been developed which enables the probe to follow and scan a wide range of axi-symmetric insulator profiles.
Journal ArticleDOI
Residual charge distribution of positive surface streamer
TL;DR: In this article, the authors developed a measuring system of charges accumulated on an insulating plate with an electrostatic probe whose sensing electrode is of 0.5 mm diameter, which was used to suppress the excessive amplification of the noise.
Journal ArticleDOI
Investigation of surface discharges on different polymeric materials under HVAC in atmospheric air
Hai-Bao Mu,Guan-Jun Zhang,Y Komiyama,Shota Suzuki,Hiroaki Miyake,Yasuhiro Tanaka,Tatsuo Takada +6 more
TL;DR: In this article, a single cycle of sinusoidal HVAC with peak value of 5 kV and duration time of 50ms is applied on a needle-plate electrode configuration and the applied voltage starts from the positive or negative half-cycle, respectively.
Journal ArticleDOI
Leader propagation in uniform background fields in SF6
TL;DR: Seeger et al. as discussed by the authors presented a physical leader propagation model that consistently describes the observed phenomena in uniform background fields in SF6, which can be associated with the precursor and the stem mechanisms.