Propagation characteristics of a positive surface streamer

Kumada, Akiko; Fukuda, Yoshiro; Kamada, Y.; Hidaka, Kunihiko

doi:10.1002/tee.20013

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…In recent years, optical systems based on the Pockels effect have been proposed for the two-dimensional potential distribution measurement on a planar insulator [5][6][7][8][9]. This optical technique has enabled the potential distribution of a propagating negative streamer to be directly measured with high time (0.2 ns) and high spatial (10 µm) resolution [7].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional potential and charge distributions of positive surface streamer

Tanaka¹,

Matsuoka²,

Kumada³

et al. 2009

J. Phys. D: Appl. Phys.

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Information on the potential and the field profile along a surface discharge is required for quantitatively discussing and clarifying the propagation mechanism. The sensing technique with a Pockels crystal has been developed for directly measuring the potential and electric field distribution on a dielectric material. In this paper, the Pockels sensing system consists of a pulse laser and a CCD camera for measuring the instantaneous two-dimensional potential distribution on a 25.4 mm square area with a 50 µm sampling pitch. The temporal resolution is 3.2 ns which is determined by the pulse width of the laser emission. The transient change in the potential distribution of a positive surface streamer propagating in atmospheric air is measured with this system. The electric field and the charge distributions are also calculated from the measured potential profile. The propagating direction component of the electric field near the tip of the propagating streamer reaches 3 kV mm−1. When the streamer stops, the potential distribution along a streamer forms an almost linear profile with the distance from the electrode, and its gradient is about 0.5 kV mm−1.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional potential and charge distributions of positive surface streamer

Tanaka¹,

Matsuoka²,

Kumada³

et al. 2009

J. Phys. D: Appl. Phys.

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“…The surface charge density is influenced by many factors, such as the type of insulating material, surface roughness, gas pressure, electric field distribution, and surface discharge intensity. In Deng's and Kumada's investigations [52,53], the maximum surface charge density was higher than several hundred pC mm −2 due to the extensive leader discharge and the high perpendicular electric field component. For a conventional insulator in highpressure SF 6 under DC voltage, the surface charge is approximately several tens of pC mm −2 due to possible corona discharges, which was measured by Fujinami et al [34], Xue et al [54], and Li et al [55].…”

Section: Estimation Of Average Streamer Propagation Velocitymentioning

confidence: 93%

Volume and surface memory effects on evolution of streamer dynamics along gas/solid interface in high-pressure nitrogen under long-term repetitive nanosecond pulses

Zhao

Huang

Wang

et al. 2020

Plasma Sources Sci. Technol.

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Evolution of the surface streamer and the discharge mode transition from the corona discharge to the surface flashover were investigated by pulse sequence resolved electrical and optical measurements under long-term repetitive nanosecond pulses (RNP). The test sample was a cylindrical epoxy resin insulator attached with a needle electrode in 0.1-0.4 MPa nitrogen. Under positive RNP, the inception phase of subsequent streamer discharges decreases with increasing the pulse repetition frequency (PRF), and a periodical streamer stagnation phenomenon appears at high gas pressure. Under negative RNP, the surface streamer does not illustrate symbolic decreasing tendencies in light intensity and corona inception phase in gas gap. The dependence of the evolution of surface streamer velocity on PRF is correlated with the repulsive force from surface charges and the accessibility of seed electrons. Statistical characteristics of back discharges under negative RNP are qualitatively explained by the local electric field around the triple junction. The reversal phenomenon of polarity effect of the allowable repetitive working coefficient is probably resulted from the corona stabilization effect, the surface electron detrapping process, and the assistance of background electric field. Principal results qualitatively support that behaviors of surface streamer and flashover are dominated by the electric field distribution, volume and surface memory effects as well as their interactions and bidirectional transformations, which are different from the monotonically facilitative tendency predicted by the metastable-species-dominated memory effect mechanism.

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