Factors Controlling Surface Flashover in SF6 Gas Insulated Systems

Nitta, T.; Shibuya, Y.; Fujiwara, Y.; Arahata, Yoshikuni; Takahashi, Hideki; Kuwahara, Hiroshi

doi:10.1109/tpas.1978.354569

Cited by 86 publications

(38 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most studies are designed to investigate the importance of some parameters for flashover or establish a link between the flashover voltage and the parameter under consideration. These studies showed that the flashover is hugely influenced by components from the fundamental properties of the dielectric material such as surface conductivity and permittivity, as well as non-fundamental components such as metal particle contamination, surface defects, and defects at the triple junction interface [66].…”

Section: Plasma-enhanced Treatmentmentioning

confidence: 99%

Surface fluorinated epoxy resin for high voltage DC application

Mohamad

Chen

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

Charge build up under high voltage DC is a significant concern in the transmission system as its presence may distort the local electric field. By chemically treat polymeric insulation via directfluorination, and plasma enhanced fluorination process, the charge transport characteristics of the material can be modified. In doing so, excellent surface properties similar to those of fluoropolymers can be attained without compromising the bulk properties of the original polymeric insulation. The change in chemical components at the surface of polymeric insulation should lead to a corresponding change in dielectric properties at the surface and consequently may suppress the occurrences of charge build up. In this research, epoxy resin samples with various surface fluorinating conditions were formulated and treated. The samples then were characterised by SEM and EDX analysis, Raman spectroscopy, and DC surface conductivity measurements. To further explain the effects of fluorination treatment, modelling of the electric field and current density distribution had been carried out. Surface potential decay tests from corona discharge, as well as PEA measurements, show that there is a significant change in decay characteristics with the introduction of surface fluorinated layer. The decay mechanisms responsible for the observed

show abstract

Section: Plasma-enhanced Treatmentmentioning

confidence: 99%

Surface fluorinated epoxy resin for high voltage DC application

Mohamad

Chen

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

show abstract

“…The contamination of SF 6 by water vapor may lead to an important degradation of its insulating performances [18]. Electrical discharges in wet SF 6 produce long-lived decomposition by-products.…”

Section: Moisture Influence On Sf 6 Recoverymentioning

confidence: 99%

The effects of moisture and gaseous additives on SF6 recovery characteristics

Spiliopoulos¹

2006

Euro. Trans. Electr. Power

View full text Add to dashboard Cite

SUMMARYIn order to investigate the intrinsic recovery characteristics of SF 6 an idealized model-breaker experiment is designed. The experimental simulation of the interruption phenomena offers the possibility to study the evolution of the free-decaying plasma dielectric strength against the recovery time. The effect of gaseous additives such as air, nitrogen and oxygen on the SF 6 recovery characteristics has been researched. The obtained recovery curves show distinct phases as for pure SF 6 . The influence depends on the gaseous additive nature and its proportion to the gaseous mixture. The presence of water vapor (humidity) in the breaking chamber is proved to be a degradation agent of the SF 6 insulating and recovery properties. Both dielectric and post-arc recovery studies show that the gas dielectric strength reduces with the increment of the humidity concentration.

show abstract

“…Particles can be moved onto the insulators by the electric field and can, subsequently, initiate breakdown [1,17,51,52,60,[64][65][66]. The insulator flashover characteristics with particles are very similar to the particle-initiated gas breakdown characteristics.…”

Section: Paricle Contamination Effectsmentioning

confidence: 99%

“…The most critical position for the long wire particles with disc insulators has been shown to be where the tangential field is a maximum rather than the resultant field [60]. With conical insulators, the most critical position is the inside corners where the insulators meet the conductor or the enclosure [51].…”

Section: Paricle Contamination Effectsmentioning

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

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

Factors Controlling Surface Flashover in SF6 Gas Insulated Systems

Cited by 86 publications

References 9 publications

Surface fluorinated epoxy resin for high voltage DC application

Surface fluorinated epoxy resin for high voltage DC application

The effects of moisture and gaseous additives on SF6 recovery characteristics

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

Contact Info

Product

Resources

About