The barrier effect in dielectrics: the role of interfaces in the breakdown of inhomogeneous dielectrics

Lebedev, S.M.; Gefle, O.S.; Pokholkov, Y.P.

doi:10.1109/tdei.2005.1453459

Cited by 58 publications

(30 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Proper use of gas-solid hybrid insulation techniques could offer the possibility to eliminate the need for the strong greenhouse gas SF 6 as insulating medium in MV switchgear. The increase in withstand strength can be realized by either covering parts of the electrodes [1]- [6] or with interelectrode barriers [7]- [10]. Such methods require simulation models that model the relevant effects with high accuracy.…”

Section: Introductionmentioning

confidence: 99%

Surface charging of dielectric barriers under positive lightning impulse stress

Meyer

Mauseth

Husoy

et al. 2017

2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP)

View full text Add to dashboard Cite

Abstract-The complex geometry of gas-insulated substations makes it difficult to predict withstand voltages. A key challenge is the characterization of the interaction between electrical discharges and dielectric surfaces. A 60 mm rod-plane air gap with a dielectric barrier is stressed with positive lightning impulse, initiating discharges that are characterized with a PMT, a current measurement system and a high-speed camera. The discharges do not lead to breakdown at the tested voltages. The residual potential on the barrier is measured with a potential probe. Depending on the gap distance, the potential distribution is either bell-shaped or saddle-shaped. The saddle-shape appears when back discharges are seen from the electrode to the barrier. Back discharges reduce the surface charge until the voltage between barrier and rod is lower than the rod inception voltage. Charge density distributions are estimated from the measurements using FEM simulations. In addition to streamer discharges, leadertype channels are sometimes observed. They are arrested close to the dielectric surface. Streamers from these channels charge the dielectric barrier additionally.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface charging of dielectric barriers under positive lightning impulse stress

Meyer

Mauseth

Husoy

et al. 2017

2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP)

View full text Add to dashboard Cite

show abstract

“…For the macroscopic inhomogeneous dielectrics [6,7] the interface between two dielectrics with different characteristics may play the role of these inhomogenieties. On manufacturing the samples by extrusion, hot pressing and molding method, the initial state of the samples depends on the melt flow direction and cooling rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Mechanical Strain on the Treeing Phenomenon

Gefle

Lebedev

Volokhin

et al. 2007

2007 IEEE International Conference on Solid Dielectrics

Self Cite

View full text Add to dashboard Cite

The influence of the mechanical strain on the tree inception and growth in polymeric dielectrics such as polymethyl methacrylate, polystyrene and polycarbonate was studied in this work. The tree inception and growth process in transparent dielectrics was monitored by the optical method in white and polarized light in the divergent field under AC voltage. It has been found that the tree-inception time and the tree-growth time are dependent on a residual mechanical strain in the vicinity of the needle tip and in the sample volume. The tree inception-time may be increased by means of the control of the mechanical strain in the vicinity of the needle tip. Not only the treeinception and growth time but also the tree shape depends on residual mechanical strain.

show abstract

“…4, 5 The motivation for a multilayered structure is to take advantage of the barrier effect. [6][7][8][9] It is well known that introducing a component that presents a barrier to the propagation of the electrical breakdown channel can increase the dielectric strength of the material. 10 A multilayered polymer material provides many barriers to the propagation of a breakdown through the film.…”

mentioning

confidence: 99%

Dielectric response of structured multilayered polymer films fabricated by forced assembly

Wolak¹,

Pan²,

Wan³

et al. 2008

Applied Physics Letters

View full text Add to dashboard Cite

The effect of introducing a multilayer microstructure on the dielectric properties of polymer materials is evaluated in 32- and 256-layer films with alternating polycarbonate (PC) and polyvinylidene-hexafluoropropylene (coPVDF) layers. The permittivity, dielectric loss, dielectric strength, and energy density were measured as a function of the relative PC/coPVDF volume concentrations. The permittivity follows an effective medium model while the dielectric strength was typically higher than that predicted by a volume fraction based weighted average of the components. Energy densities as high as ∼14J∕cm3, about 60% greater than that of the component polymers, are measured for 50% PC/50% coPVDF films.

show abstract

The barrier effect in dielectrics: the role of interfaces in the breakdown of inhomogeneous dielectrics

Cited by 58 publications

References 18 publications

Surface charging of dielectric barriers under positive lightning impulse stress

Surface charging of dielectric barriers under positive lightning impulse stress

Effect of the Mechanical Strain on the Treeing Phenomenon

Dielectric response of structured multilayered polymer films fabricated by forced assembly

Contact Info

Product

Resources

About