Optical Observation of Self-Gas-Flow in GCB

Oomori, Tatsuo; Hamano, S.; Sasao, H.; Ueda, Y.; Murai, Y.

doi:10.1109/tpas.1983.318094

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…Es- An arc is a kind of plasma discharge, which is accompanied by the creation of high temperature and the emission of strong light. The research [8,26,30] has indicated that the temperature of an arc can reach 20,000 K, based on measurements in a large current region above 1 kA. The lights created by arcs include infrared light, visible light, and ultraviolet light.…”

Section: Discussionmentioning

confidence: 99%

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Zhao¹,

Nie²,

Zhao³

et al. 2021

Energies

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The substantial improvements in transmission voltage, which have been adopted to meet fast-growing energy demands, require more reliable power equipment and higher-quality insulating materials. The polytetrafluoroethylene (PTFE) nozzle, as the key part of a high-voltage circuit breaker, is often subjected to arc ablation and breakdown phenomena. Thus, it is very urgent to develop nozzles with better performance. In this study, PTFE/boron nitride (BN) composites were prepared. The relationships among the BN filler loading, thermal transition properties, spectral reflectance properties, arc ablation resistance, and AC dielectric breakdown performances, as well as their corresponding mechanisms, were studied. Experimental results show that the thermal conductivity and thermal diffusivity of PTFE/BN composites increased monotonously with BN loading, and that both parameters were improved by 41% and 44%, respectively, for 11 wt % composites compared with pure PTFE. Moreover, PTFE/BN composites had higher light reflectance in the wavelength range from 320 to 2500 nm. The PTFE/BN composites presented better arc ablation resistance performance with increased BN loading, which was improved by 88.5%. It is thought that the increased thermal conductivity, thermal diffusivity, the strong light reflectance, and surface sediment after arc ablation contribute to the improvement in arc ablation resistance performance. The AC breakdown strength of PTFE/BN composites was enhanced by 30.93%, attributed to the good heat dissipation properties introduced by the BN fillers. Thus, filling BN into the PTFE matrix would be helpful to solve the equipment issue that comes from the improvement in transmission voltage.

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Section: Discussionmentioning

confidence: 99%

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Zhao¹,

Nie²,

Zhao³

et al. 2021

Energies

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“…Based on measurements in a large current region above 1 kA and analysis, SF 6 arc temperature is estimated as high as about 20,000 K. At such a high temperature, PTFE exposed to SF 6 arc ablates due to heat transfer and radiation power emitted from the arc. Particularly, radiation power reaching about 50% of input power is likely to be the main factor of PTFE ablation.…”

Section: Main Factors Of Ptfe Ablationmentioning

confidence: 99%

Ablated mass of PTFE nozzle due to high‐current SF₆ arc exposure: Formulation of ablated mass

Sato

Horinouchi

Hiza

et al. 2019

Electrical Engineering Japan

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Characteristics of PTFE ablation due to SF6 arc exposure were studied to predict the ablated mass of PTFE nozzle in high‐voltage circuit breaker. From the measurement of the ablated mass, the predominant factor of the PTFE ablation was revealed as a radiation power of SF6 arc. Subsequently, the radiation power absorbed in PTFE was formulated on the basis of the radiation transfer property and the arc physics. The formulation for the prediction of the PTFE ablated mass was established with the formulated radiation power and the measured masses. Finally, the validity of the PTFE ablated mass prediction was shown from the results of the error verification with the measured masses.

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Transient pressure variations in SF₆puffer circuit breakers

Shimmin¹,

Jones²,

Ali³

1990

J. Phys. D: Appl. Phys.

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The operation of the SF6 puffer circuit breaker relies on he pressurisation of gas by a combination of piston compression, nozzle blocking and gas heating. Theoretical modelling of the physical processes occurring during high-current interruption is important for mechanical design and for prediction of electrical performance. A high-current arc model has been developed, which takes account of observed gas behaviour throughout the arcing period and beyond current zero. The predicted pressurisation is compared with experimental work, and shows good agreement over a wide range of operating conditions. The theoretical model pays particular attention to the mechanisms of heat transfer within the upstream region of the interrupter, and incorporates a new description of the arc thermal boundary.

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Optical Observation of Self-Gas-Flow in GCB

Cited by 6 publications

References 4 publications

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Ablated mass of PTFE nozzle due to high‐current SF₆ arc exposure: Formulation of ablated mass

Transient pressure variations in SF₆puffer circuit breakers

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Optical Observation of Self-Gas-Flow in GCB

Cited by 6 publications

References 4 publications

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Ablated mass of PTFE nozzle due to high‐current SF6 arc exposure: Formulation of ablated mass

Transient pressure variations in SF6puffer circuit breakers

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Product

Resources

About

Ablated mass of PTFE nozzle due to high‐current SF₆ arc exposure: Formulation of ablated mass

Transient pressure variations in SF₆puffer circuit breakers