Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Liu, Jiajun; Karady, G.G.

doi:10.1109/tdei.2015.7116366

Cited by 8 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of a single barrier to increase the breakdown voltage is limited under certain conditions [10], and thus multiple barriers are inserted in the air‐insulated gap to further increase the breakdown voltage. The experimental results show that the barrier effect of a system with two barriers is about two times more efficient than that with a single barrier [22–25]. A fluid model is used to observe a series of discharge spreading and reignition in the air‐insulated gap with two barriers [25].…”

Section: Introductionmentioning

confidence: 99%

Breakdown path control by barrier effect for improving withstand characteristics of air‐insulated gaps under alternating voltages

et al. 2022

View full text Add to dashboard Cite

A polymer barrier inserted in the interelectrode gap can significantly improve the insulation performance of air-insulated high-voltage electrical equipment. With the development of power equipment towards integration and miniaturisation, multiple barriers can be used to further increase the insulation level. This paper investigated the withstand characteristics of the air-insulated rod-rod gap with multiple barriers by changing the barrier numbers, the barrier position and the barrier insertion direction. Four control modes were set up based on the assumed breakdown paths under alternating voltages. It was found that the control modes with barriers inserted from the opposite direction had a more significant improvement effect than that from the same direction. When the horizontal barrier position was closer to the electrode and the vertical barrier position was farther to the electrode axis, the breakdown voltage was higher. The vertical barrier position was a key factor affecting the probability of breakdown path type, and the breakdown voltages along different types of breakdown paths were almost the same when the barriers were at the same position. The increase of the breakdown voltage was mainly resulted from the change of electric field distribution in the insulated gap and the extension of the breakdown path length.

show abstract

Section: Introductionmentioning

confidence: 99%

Breakdown path control by barrier effect for improving withstand characteristics of air‐insulated gaps under alternating voltages

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In recent years, about the dielectric properties of insulation materials, scholars have conducted a large number of experiments on insulation materials flashover (Xie et al , 2019; Liu and Karady, 2015). There are few comparative tests and insulation characteristics studies on different insulation materials (Yang et al , 2019; Gao et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Flashover of insulation materials induced by electrostatic electromagnetic pulse

Zhang

Xin

et al. 2022

COMPEL

View full text Add to dashboard Cite

Purpose The purpose of this paper is to research the induced flashover laws of different insulation materials under electrostatic electromagnetic pulse, and the induced flashover characteristics of different electrode structures are further explored. Design/methodology/approach According to standard IEC 61000–4-2, an experimental system of electrostatic electromagnetic pulse flashover for insulation materials is established. The induction flashover laws of polytetrafluoroethylene, epoxy resin and polymethyl methacrylate surface-mounted finger electrodes under the different intensity of electrostatic electromagnetic pulse are researched. The influence of the finger electrode, needle–needle electrode and needle–plate electrode on insulation flashover was compared. Secondary electron emission avalanche (SEEA) and field superposition theory are used to analyze the experimental results of electrostatic electromagnetic pulse induced flashover. Findings The larger the dielectric strength of insulation materials, the more difficult flashover occurs on the surface. The field superposition enhances collision ionization between electrons and gas molecules, which leads to the insulation materials surface induced flashover easily by electrostatic electromagnetic pulse. The sharper the electrode shapes on the insulation materials surface, the stronger the electric field intensity at the cathode triple junction, more initial electrons are excited to form the discharge channel, which easily leads to flashover on the surface of the insulating material. Originality/value The proposed field superposition combined with the SEEA method provides a new study perspective and enables a more rational, comprehensive analysis of electrostatic electromagnetic pulse induced flashover of insulation materials. The work of this paper can provide a reference for the safety protection of spacecraft in orbit under a strong electromagnetic field environment, increase the service life of spacecraft and improve the reliability of spacecraft’s safe operation in orbit. It provides a basis for the selection of insulation materials for equipment under the different intensities of the external electromagnetic environment.

show abstract

“…In the case of air insulation, there has been a lot of researches conducted to clarify the electrical breakdown path and voltage characteristics according to the solid dielectric barrier. However, few studies have been conducted on the puncture breakdowns of solid dielectric barriers [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Lightning impulse breakdown path and characteristics with dielectric BMC barrier inserted sphere‐plane electrode

Seok

Choi

2020

IET sci. meas. technol.

View full text Add to dashboard Cite

This study deals with the electrical breakdown characteristics of the sphere‐plane electrode system with the dielectric barrier of bulk moulding compound (BMC) material under the positive lightning impulse voltage. The sphere electrode has a spherical shape of 50 mm in diameter and suspended with a metal rod of 10 mm in diameter, while the plane electrode has a circular with a diameter of 350 mm. The dielectric barrier has a square plate shape of BMC material, and the dimension is changed from 80 × 80 to 240 × 240 mm2. Experimental results show that electrical breakdown paths could be identified into three categories, depending on the dielectric barrier position and the dimension. The larger and farther away from the sphere electrode the dimension of the dielectric barrier is, the occurrence probability of electrical breakdown through the penetration of dielectric barrier becomes. It was confirmed that the breakdown voltage considerably depends on the dimension of the dielectric barrier and the dielectric barrier position.

show abstract

Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Cited by 8 publications

References 16 publications

Breakdown path control by barrier effect for improving withstand characteristics of air‐insulated gaps under alternating voltages

Breakdown path control by barrier effect for improving withstand characteristics of air‐insulated gaps under alternating voltages

Flashover of insulation materials induced by electrostatic electromagnetic pulse

Lightning impulse breakdown path and characteristics with dielectric BMC barrier inserted sphere‐plane electrode

Contact Info

Product

Resources

About