Development of 1200-kV Compressed-Gas-Insulated Transmission and Substation Equipment in the United States

Walldorf,; Gnadt,

doi:10.1109/tpwrd.1987.4308118

Cited by 5 publications

References 2 publications

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Study on the influence of O2 on the breakdown voltage and self-recovery characteristics of c-C4F8/N2 mixture

et al. 2018

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The c-C4F8 gas is considered to have great potential as a gaseous medium for use in gas-insulated equipment due to its good insulation properties and its relatively low greenhouse gas potential (Global warming potential, GWP) relative to SF6. In this paper, the breakdown characteristics of c-C4F8/N2 gas mixtures are explored through the experimental and theoretical calculations and the influence of a small amount of oxygen in the mixtures is discussed. The breakdown tests were conducted under AC voltage. With the mixing ratio of c-C4F8 at 15%, the breakdown voltage of different oxygen contents was tested at 0.15 MPa. At the same time, the self-recovery performance of gas mixture was tested by several times breakdown test, and the breakdown voltage of mixed gas was calculated according to the Townsend self-sustaining discharge condition. The results show that the addition of O2 significantly reduced the breakdown voltage of the c-C4F8/N2 mixed gas, and the self-recovery characteristics of the mixed gas containing 3% O2 are significantly lower than that of the c-C4F8/N2 without O2. The calculation results of breakdown voltage are consistent with the test results. It is considered that the content of oxygen in the mixed gas of c-C4F8 should be strictly controlled.

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Study on the influence of O2 on the breakdown voltage and self-recovery characteristics of c-C4F8/N2 mixture

et al. 2018

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Research status of replacement gases for SF6 in power industry

et al. 2020

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SF6 is widely used in the industrial field due to its stable structure and excellent properties. It is mainly used in electrical insulation equipment. Due to the boiling point of SF6, its use in extremely cold regions has been limited. It is harmful to the health of practitioners due to the toxicity of decomposition products. The gas has limited its wider use because of its strong greenhouse effect. As a result, researchers and electrical equipment manufacturing companies around the world are gradually searching for new environmentally friendly gases and have conducted research and exploration on theory and experiment. In this paper, the current status and existing problems of SF6 are summarized. The research contents and research methods of SF6 alternative gas direction are reviewed from the aspects of insulation performance, interrupter performance, and decomposition performance. The existing research results of the natural gas, SF6 mixed gas, perfluorocarbons, and CnFmX gas are summarized, and the future development trend of alternative gas for SF6 in the electrical industry is proposed.

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Investigation of an SF/sub 6/ ultra high voltage circuit breaker using an opening resistor and auxiliary interrupter

Oshita

Hirasawa

Kurosawa

1992

IEEE Trans. Power Delivery

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Development of 1200-kV Compressed-Gas-Insulated Transmission and Substation Equipment in the United States

Cited by 5 publications

References 2 publications

Study on the influence of O2 on the breakdown voltage and self-recovery characteristics of c-C4F8/N2 mixture

Study on the influence of O2 on the breakdown voltage and self-recovery characteristics of c-C4F8/N2 mixture

Research status of replacement gases for SF6 in power industry

Investigation of an SF/sub 6/ ultra high voltage circuit breaker using an opening resistor and auxiliary interrupter

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