Experimental investigation of surface flashover in vacuum using nanosecond pulses

Yan, Ping; Shao, Tao; Wang, Jue; Wei, Gao; Yuan, Wu; Pan, Rui; Zhang, Shichang; Sun, Guoqiang

doi:10.1109/tdei.2007.369524

Cited by 54 publications

(14 citation statements)

References 19 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A simple method to complicate the configuration of an insulator while fixing the insulator thickness is to increase the insulator's half conical angle h, that is, to fabricate it as a frustum. When h deviates from 0 , the E f of an frustum insulator would increase considerably, which is verified by many experimental results, either for the insulator in vacuum [35][36][37][38][39] or for the insulator in transformer oil. 13,14,40 Assuming that a batch of frustum insulator are immersed in transformer oil, the E f would increase as the conical angle h deviates from 0 .…”

Section: Complicating the Configuration Of The Insulatorssupporting

confidence: 58%

Mechanism and influencing factors on critical pulse width of oil-immersed polymer insulators under short pulses

Zhao

et al. 2015

Physics of Plasmas

View full text Add to dashboard Cite

The critical pulse width (s c ) is a pulse width at which the surface flashover threshold (E f ) is equal to the bulk breakdown threshold (E BD ) for liquid-polymer composite insulation systems, which is discovered by Zhao et al. In this paper, the mechanism of s c is interpreted in perspective of the threshold and the time delay (t d ) of surface flashover and bulk breakdown, respectively. It is found that two changes appear as the pulse width decreases which are responsible for the existence of s c : (1) E BD is lower than E f ; (2) t d of bulk breakdown is shorter than t d of surface flashover. In addition, factors which have influences on s c are investigated, such as the dielectric type, the insulation length, the dielectric thickness, the dielectrics configuration, the pulse number, and the liquid purity. These influences of factors are generalized as three types if s c is expected to increase: (1) factors causing E BD to decrease, such as increasing the pulse number or employing a dielectric of lower E BD ; (2) factors causing E f to increase, such as complicating the insulator's configuration or increasing the liquid purity; (3) factors causing E BD and E f to increase together, but E f increases faster than E BD , such as decreasing the dielectric thickness or the insulation length. With the data in references, all the three cases are verified experimentally. In the end, a general method based on s c for solid insulation design is presented and the significance of s c on solid insulation design and on solid demolition are discussed. V C 2015 AIP Publishing LLC. [http://dx.

show abstract

Section: Complicating the Configuration Of The Insulatorssupporting

confidence: 58%

Mechanism and influencing factors on critical pulse width of oil-immersed polymer insulators under short pulses

Zhao

et al. 2015

Physics of Plasmas

View full text Add to dashboard Cite

show abstract

“…The generator coaxial output requires a compact dielectric having a cylindrical shape, such as the one presented in Figure 1. This geometry is very common for insulators placed at the input or output of pulsed power generators [8][9][10][11][12][13]. At the same time, this particular shape of dielectric has certain features that have to be observed in order to avoid flashover, which makes the published formulas for simple geometries not applicable for calculating the surface breakdown voltage.…”

Section: Introductionmentioning

confidence: 99%

Determination of Breakdown Voltage Along the Surface of a Cylindrical Insulator

Zhabin

Ferron²,

Rivaletto³

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

This paper investigates the electric breakdown along the surface of a cylindrical dielectric, part of a coaxial transmission line. The particular geometry of the insulator is very common, as it is used at the input or output of most high-power, high voltage generators. The streamer propagation criterion is used to calculate the flashover voltage. Studies of the dependence of the flashover voltage on the distance between the electrodes obtained in tests with DC voltage and also by applying voltage impulses with different durations and rise-times are reported. The highest difference between the estimated values and the experimental data is less than 15%, which proves the applicability of the criterion for determining the surface breakdown voltage within the geometry under study. In particular, the results of these studies are used in the design of a compact 0.5 MV pulsed power system currently under development.

show abstract

“…There are many factors influencing surface flashover performance in vacuum, such as dielectric constant of insulating material, shapes of both solid insulator and electrode, surface charge density, surface morphology of insulator, applied voltage, and so on. All these factors have been widely investigated in many studies [1][2][3][4][5][6][7][8][9][10][11]. Especially, the surface morphology of the insulator is closely related to its vacuum insulating performance [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polymethyl-methacrylate using atmospheric pressure argon plasma jets to improve surface flashover performance in vacuum

Shao

Zhou

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

Self Cite

103

View full text Add to dashboard Cite

Hydrophilic modification of polymethyl methacrylate (PMMA) surface is performed by atmospheric pressure plasma jet (APPJ) in Ar gas for improving the PMMA surface flashover performance in vacuum. In the experiments, APPJ is driven by a microsecond-duration pulsed generator, which has voltages of 0-30 kV, a rise time of 300 ns and a full width at half maximum of 2 s. Characteristics of the APPJ are analyzed according to its voltage and current waveform, discharge image and optical emission spectrum. Furthermore, surface properties of the PMMA surface before and after the treatment are characterized by water contact angle measurements and morphology observations. Results show that the main species of the plasma jet are composed of N 2 , Ar, OH, and O, among which such polar groups as OH and O enhance the hydrophilic property of the PMMA surface. The water contact angle decreases from 68° to a minimum value (16°) after the treatment. In addition, all the surface flashover voltages in vacuum for the PMMA samples treated by APPJ are higher than those for the untreated PMMA samples.Index Terms -Pulsed power, microsecond pulse, gas discharge, pulsed discharge, non-thermal plasma, atmospheric pressure plasma jet, surface treatment, hydrophilic modification, surface flashover, flashover voltage.

show abstract

Experimental investigation of surface flashover in vacuum using nanosecond pulses

Cited by 54 publications

References 19 publications

Mechanism and influencing factors on critical pulse width of oil-immersed polymer insulators under short pulses

Mechanism and influencing factors on critical pulse width of oil-immersed polymer insulators under short pulses

Determination of Breakdown Voltage Along the Surface of a Cylindrical Insulator

Surface modification of polymethyl-methacrylate using atmospheric pressure argon plasma jets to improve surface flashover performance in vacuum

Contact Info

Product

Resources

About