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Breakdown Characteristics of SF_6 and Liquefied SF_6 at Decreased Temperature
Eun-Hyeok Choi,김기채,이광식 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
SF_6 gas has been used as arc quenching and insulating medium for high and extra high voltage switching devices due to its high dielectric strength, its excellent arc-quenching capabilities, its high chemical stability and non toxicity. Despite of its significant contributions, the gas was classified as one of the greenhouse gas in the Kyoto Protocol. Thus, many researches are conducted to find out the replacement materials and to develop the SF_6 gas useless electrical equipment. This paper describes experiments on the temperature change-related breakdown characteristics of SF_6 gas (SF_6) and SF_6 liquid (LSF_6) in a model GIS(Gas-Insulated Switchgear) chamber in order to show the possibility of more stable and safe usages of SF_6 gas. The breakdown characteristics are classified into three stages,namely the gas stage of SF_6 according to Paschen's law, the coexisting stage of SF_6 gas with liquid in considerable deviation at lower temperature, and the stage of LSF_6 and remaining air. The result shows that the ability of the LSF_6 insulation is higher than the high-pressurized SF_6. Moreover, it reveals that the breakdown characteristics of LSF_6 are produced by bubble-formed LSF_6 evaporation and bubbles caused by high electric emission and the corona. In addition, the property of dielectric breakdown of LSF_6 is determined by electrode form, electrode arrangement, bubble formation and movement, arc extinguishing capacity of the media, difficulty in corona formation, and the distance between electrodes. The bubble formation and flow separation phenomena were identified for LSF_6. It provides fundamental data not only for SF_6 gas useless equipment but also for electric insulation design of hightemperature superconductor and cryogenic equipment machinery, which will be developed in future studies.
Breakdown Characteristics of SF6 and Liquefied SF₆ at Decreased Temperature
Eun-Hyeok Choi,Ki-Chai Kim,Kwang-Sik Lee 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
SF6 gas has been used as arc quenching and insulating medium for high and extra high voltage switching devices due to its high dielectric strength, its excellent arc-quenching capabilities, its high chemical stability and non toxicity. Despite of its significant contributions, the gas was classified as one of the greenhouse gas in the Kyoto Protocol. Thus, many researches are conducted to find out the replacement materials and to develop the SF6 gas useless electrical equipment. This paper describes experiments on the temperature change-related breakdown characteristics of SF6 gas (SF6) and SF6 liquid (LSF6) in a model GIS(Gas-Insulated Switchgear) chamber in order to show the possibility of more stable and safe usages of SF6 gas. The breakdown characteristics are classified into three stages, namely the gas stage of SF6 according to Paschen"s law, the coexisting stage of SF6 gas with liquid in considerable deviation at lower temperature, and the stage of LSF6 and remaining air. The result shows that the ability of the LSF6 insulation is higher than the high-pressurized SF6. Moreover, it reveals that the breakdown characteristics of LSF6 are produced by bubble-formed LSF6 evaporation and bubbles caused by high electric emission and the corona. In addition, the property of dielectric breakdown of LSF6 is determined by electrode form, electrode arrangement, bubble formation and movement, arc extinguishing capacity of the media, difficulty in corona formation, and the distance between electrodes. The bubble formation and flow separation phenomena were identified for LSF6. It provides fundamental data not only for SF6 gas useless equipment but also for electric insulation design of hightemperature superconductor and cryogenic equipment machinery, which will be developed in future studies.
Choi, Eun-Hyeok,Lim, Chang-Ho,Yoon, Dae-Hee,Park, Kwang-Seo,Kim, Lee-Kook,Lee, Kwang-Sik The Korean Institute of Electrical Engineers 2007 Journal of Electrical Engineering & Technology Vol.2 No.2
In this paper the experiments of breakdown characteristics by temperature change of $SF_6$ gas($GSF_6$), and $SF_6$ liquid ($LSF_6$) in model GIS (Gas Insulated Switchgear) are described. From the experiment's results, the breakdown characteristics classify the vapor stage of $SF_6$ according to Paschen's law, in which the gas & liquid coexisted stage of voltage value increases, resulting in much deviation and the breakdown of voltage ($V_B$) low stage as the interior of the chamber gets filled with a mixture of $SF_6$ that is not liquefacted and remaining air that cannot be ventilated. The ability of $LSF_6$ insulation is higher than the high-pressurized $SF_6$ gas. The breakdown characteristics of $LSF_6$ were produced by bubble formed evaporation of $LSF_6$ and bubbles caused by high electric emission. It is considered in this paper that the results are fundamental data for electric insulation design of superconductor and cryogenic equipments machinery that will be studied and developed in the future.
Breakdown Characteristics of SF<sub>6</sub> and Liquefied SF<sub>6</sub> at Decreased Temperature
Choi, Eun-Hyeok,Kim, Ki-Chai,Lee, Kwang-Sik The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
$SF_6$ gas has been used as arc quenching and insulating medium for high and extra high voltage switching devices due to its high dielectric strength, its excellent arc-quenching capabilities, its high chemical stability and non toxicity. Despite of its significant contributions, the gas was classified as one of the greenhouse gas in the Kyoto Protocol. Thus, many researches are conducted to find out the replacement materials and to develop the $SF_6$ gas useless electrical equipment. This paper describes experiments on the temperature change-related breakdown characteristics of $SF_6$ gas ($SF_6$) and $SF_6$ liquid ($LSF_6$) in a model GIS(Gas-Insulated Switchgear) chamber in order to show the possibility of more stable and safe usages of $SF_6$ gas. The breakdown characteristics are classified into three stages, namely the gas stage of $SF_6$ according to Paschen's law, the coexisting stage of $SF_6$ gas with liquid in considerable deviation at lower temperature, and the stage of $LSF_6$ and remaining air. The result shows that the ability of the $LSF_6$ insulation is higher than the high-pressurized $SF_6$. Moreover, it reveals that the breakdown characteristics of $LSF_6$ are produced by bubble-formed $LSF_6$ evaporation and bubbles caused by high electric emission and the corona. In addition, the property of dielectric breakdown of $LSF_6$ is determined by electrode form, electrode arrangement, bubble formation and movement, arc extinguishing capacity of the media, difficulty in corona formation, and the distance between electrodes. The bubble formation and flow separation phenomena were identified for $LSF_6$. It provides fundamental data not only for $SF_6$ gas useless equipment but also for electric insulation design of high-temperature superconductor and cryogenic equipment machinery, which will be developed in future studies.
Breakdown Characteristics of SF₆ in Different State and Bubble Movements under AC High-Voltage
Eun-Hyeok Choi,Chang-Ho Lim,Dae-Hee Yoon,Kwang-Seo Park,Lee-Kook Kim,Kwang-Sik Lee 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.2
In this paper the experiments of breakdown characteristics by temperature change of SF? gas (GSF?), and SF? liquid (LSF?) in model GIS (Gas Insulated Switchgear) are described. From the experiment's results, the breakdown characteristics classify the vapor stage of SF? according to Paschen's law, in which the gas & liquid coexisted stage of voltage value increases, resulting in much deviation and the breakdown of voltage (VB) low stage as the interior of the chamber gets filled with a mixture of SF? that is not liquefacted and remaining air that cannot be ventilated. The ability of LSF? insulation is higher than the high-pressurized SF? gas. The breakdown characteristics of LSF? were produced by bubble formed evaporation of LSF? and bubbles caused by high electric emission. It is considered in this paper that the results are fundamental data for electric insulation design of superconductor and cryogenic equipments machinery that will be studied and developed in the future.
Breakdown Characteristics of SF6 in Different State and Bubble Movements under AC High-Voltage
Eun-Hyeok Choi,Chang-Ho Lim,Dae-Hee Yoon,Kwang-Seo Park,Lee-Kook Kim,Kwang-Sik Lee 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.2
characteristics by temperature change of SF6gas (GSF6), and SF6 liquid (LSF6) in model GIS (Gas Insulated Switchgear) are described. From the experiment’s results, the breakdown characteristics classify the vapor stage of SF6 according to Paschen's law, in which the gas & liquid coexisted stage of voltage value increases, resulting in much deviation and the breakdown of voltage (VB) low stage as the interior of the chamber gets filled with a mixture of SF6 that is not liquefacted and remaining air that cannot be ventilated. The ability of LSF6 insulation is higher than the high-pressurized SF6 gas. The breakdown characteristics of LSF6 were produced by bubble formed evaporation of LSF6 and bubbles caused by high electric emission. It is considered in this paper that the results are fundamental data for electric insulation design of superconductor and cryogenic equipments machinery that will be studied and developed in the future.
최은혁(Eun-Hyeok Choi),임동영(Dong-Young-Lim),박혜리(He-Rie Park),박숭규(Sung-Gyu Park),김기채(Ki-Chai Kim),이광식(Kwang-Sik Lee) 한국조명.전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
현재 SF6 가스를 사용하는 각국 정부 및 환경단체, 전기, 화학 그리고 타 산업분야에서 SF6 가스의 환경영향에 관심을 표명하고 있으며, 그 중에서도 전력산업분야는 SF6의 가스 대체 물질을 찾는데 많은 연구를 하고 있다. 이에 건조공기, N2 가스 및 혼합가스(N2:O2)에 대하여 많은 연구로 SF6를 사용하는 전력설비를 친환경절연재인 건조공기로 대체하여 배전급에 운용되고 있다. 따라서 본 논문에서는 현재 배전급에 친환경절연재로 사용되고 있는 Dry-Air에 대하여 AC 전압인가시 시간변화에 따른 연면방전 특성 비교하여 고체절연물의 절연성 평가를 하였다.