Static charge accumulated by epoxy post insulation stressed at high DC voltages

Mangelsdorf, Christopher W.; Cooke, C. M.

doi:10.1109/ceidp.1978.7728217

Cited by 24 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After a flashover has occurred, charges are trapped on the surface [62,63] but these do not necessarily result in flashover at the same site. Spark conditioning can remove particles already on the surface.…”

Section: Conditioning Effectsmentioning

confidence: 98%

“…The resistivity r for most insulator materials is related to the temperature T and field E by the relationship Charge accumulation in the bulk can occur as a result of a resistivity or conductivity gradient in the same direction as the field, due to the field dependency of the resistivity, or due to inhomogeneities in the material [62,63].…”

Section: Voltage Waveform Effects: Ac and Impulse Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Review of high-voltage gas breakdown and insulators in compressed gas

Cookson

1981

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

View full text Add to dashboard Cite

In the past ten years there have been significant advances in the theoretical and experimental analysis of high-voltage gas breakdown and surface flashover of insulators in compressed gases. This has probably been fostered by the recent growth in the design and application of gas-insulated high-voltage equipment. The review describes the characteristics of compressed-gas breakdown, including the effects of failure of Paschen's law; conditioning; electrode area; material and surface; breakdown-voltage distribution; particle contamination; voltage waveform; temperature; and gas mixtures. The insulator-flashover characteristics are then described, including the effects of insulator-electrode interface; insulator material; insulator shape; voltage waveform; charge generation; particle contamination; surface contamination; conditioning; flashover distribution; and dependence on type of gas. The various mechanisms proposed for gas breakdown and insulator flashover are reviewed and discussed in relation to the experimental characteristics. Future theoretical and experimental work is suggested to clarify the gas-breakdown and insulator-flashover mechanisms, and which would also help bring about the design of improved high-voltage gas-insulated systems.

show abstract

Section: Conditioning Effectsmentioning

confidence: 98%

Section: Voltage Waveform Effects: Ac and Impulse Characteristicsmentioning

confidence: 99%

Review of high-voltage gas breakdown and insulators in compressed gas

Cookson

1981

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

View full text Add to dashboard Cite

show abstract

“…These accumulated charges can influence the electric stress of the insulation considerably. They can reduce the voltage withstand capability and even lead to a breakdown of the insulation system [3]. The most critical parts in SF 6 gas insulated DC equipment are the surface of the insulators interfacing SF 6 and the solid, and triple points [4,5].…”

Section: Introductionmentioning

confidence: 99%

Micro discharges in HVDC gas insulated systems

Schueller

Gremaud

Doiron

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

“…Measurements to date show that surface charges can be homocharge or heterocharge [7][8][9][10]. Homocharge is claimed to be deposited by nonlinear bulk conduction in the solid insulator [10,11], whereas heterocharge is shown to be deposited either by conduction of ions through the gas generated from an emission site [7,14], or by nonlinear surface conduction [8], Surface charges may also result from the manufacturing processes, thus they may exist prior to the voltage application. Charge accumulation in the dielectric bulk occurs, either due to the field dependency of the resistivity or due to inhomogeneities in the material [11].…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies on flashover of insulators with high surface and volume resistivities under dry conditions reveal the importance of surface charges deposited on the interface [6][7][8] and of volume charges accumulated in the insulator [9][10][11] during the predischarge period. The charges deposited may enhance the electric stresses at the triple junctions and at the interface which may lower the flashover voltage [12,13].…”

Section: Introductionmentioning

confidence: 99%

Computation of the electric field at a solid/gas interface in the presence of surface and volume charges

Bektas

Farish

Hızal

1986

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

View full text Add to dashboard Cite

Enhancement of the electric field at a solid insulator/electrode/gas triple junction and on the surface of an insulator, due to imperfect contacts, surface irregularities and contamination, reduces the withstand voltage of the gas-only system. The charges deposited on the surface and in the bulk of the insulator, when stressed under high voltage, further modify the electric field. In the paper, the influence of accumulated static charges on the electric field distribution associated with a cylindrical insulator held between plane electrodes in atmospheric air is investigated. The electric field along the solid dielectric/air interface is calculated for different surface and volume charge distributions by using the finite-difference method based on Gauss's law. Derivation of the iteration equations are relatively easy, and, unlike most methods, there is no need for external imposition of solid dielectric/gas boundary conditions. The results indicate that, for some surface and volume charge distributions, field enhancement occurs at the triple junction, and this could initiate a surface flashover.List of symbols and units V = electric potential, V

show abstract

Static charge accumulated by epoxy post insulation stressed at high DC voltages

Cited by 24 publications

References 0 publications

Review of high-voltage gas breakdown and insulators in compressed gas

Review of high-voltage gas breakdown and insulators in compressed gas

Micro discharges in HVDC gas insulated systems

Computation of the electric field at a solid/gas interface in the presence of surface and volume charges

Contact Info

Product

Resources

About