Compressed Gas Insulation in the Million-Volt Range: A Comparison or SF6 with N2 and CO2

Philp, Sanborn F.

doi:10.1109/tpas.1963.291364

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…9 Conditioning is primarily an electrode effect, and electrodes conditioned at one pressure need further conditioning when th^ pressure, and therefore the field, is increased. 10 The electrode material and preparation have a large influence (Section 2.1.3): a smooth highly polished finish reduces the number of conditioning sparks, but varnish layers cause an increase. 9 *'' For conditioned Paper 6000 J, first received 14th February and in revised form 29th July 1969.…”

Section: Breakdown and Prebreakdown Characteristics 211 Conditioninmentioning

confidence: 99%

Electrical breakdown for uniform fields in compressed gases

Cookson

1970

Proc. Inst. Electr. Eng. UK

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The electrical breakdown and prebreakdown characteristics of uniform fields in compressed gases are described. The failure of Paschen's law and the dependence of the breakdown voltage on the material, preparation and area of the electrodes, on the dust content of the gas, and on the type of applied voltage are included. The failure of the Townsend and streamer mechanisms of low-pressure breakdown is discussed, and a summary is made of the many suggested breakdown mechanisms for compressed gases. These are divided into three groups: breakdown due only to field emission of electrons, breakdown due to electron-field emission and space charge in the gas, and breakdown due to electron-field emission and charge collection on an electrode. The breakdown and prebreakdown characteristics are interpreted in terms of the various breakdown mechanisms, and the areas indicated where further investigations are needed. The surface flashover of insulating spacers in compressed gases is also briefly reviewed. '

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Section: Breakdown and Prebreakdown Characteristics 211 Conditioninmentioning

confidence: 99%

Electrical breakdown for uniform fields in compressed gases

Cookson

1970

Proc. Inst. Electr. Eng. UK

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“…The breakdown voltages for both sets of results are comparable. [23] and the present study for SF 6 using a sphere-plane configuration (plane as the HV and sphere with a dia. of 19 mm as the ground) tested for a gap of 6.4 mm and pressures of 1 to 5 bar absolute.…”

Section: Comparative Study For Sf 6 Breakdownmentioning

confidence: 81%

“…A comparative investigation was carried out to ensure that the obtained SF 6 breakdown results in this study are repeatable with literature after formalizing the test procedures. The literature data were tested using a 381 mm diameter plane electrode as the HV terminal and a 19 mm diameter sphere as the ground electrode [23]. The electrodes were made of stainless steel, but the information on electrode surface finish was not specified.…”

Section: Comparative Study For Sf 6 Breakdownmentioning

confidence: 99%

“…The data for 6.4 mm gap spacing over the same pressure range was extracted from the literature [23] and compared to the present study, as depicted in Figure 6. The number of breakdowns making up statistical average of data point and error bars was not provided in [23]. The breakdown voltages for both sets of results are comparable.…”

Section: Comparative Study For Sf 6 Breakdownmentioning

confidence: 99%

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Negative DC Breakdown Characteristics of C₃F₇CN / CO₂ Gas Mixture for Application in High Voltage Accelerators

Iddrissu

Chen

Bahdad

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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This study investigates the technical feasibility of retro-filling a C 3 F 7 CN/CO 2 gas mixture for existing SF 6 -insulated accelerators. Negative DC breakdown characteristics of 20% C 3 F 7 CN / 80% CO 2 gas mixture and SF 6 for varying pressure, gap distance and field uniformity are analyzed experimentally using four distinctly different electrode configurations. The C 3 F 7 CN/CO 2 gas mixture shows a higher breakdown strength than SF 6 for configurations with high field uniformity, whereas SF 6 outperforms C 3 F 7 CN/CO 2 gas mixture under the non-uniform field. Importantly, 20% C 3 F 7 CN / 80% CO 2 gas mixture exhibits comparable insulation capability to SF 6 in a 10/30 mm coaxial geometry with similar field uniformity as found in the practical gas-insulated equipment. The results of this work contribute to the development of a potential retrofill solution using 20% C 3 F 7 CN / 80% CO 2 gas mixture for accelerators.

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“…When pressure of SF 6 is 10atm under DC situation, its dielectric strength is 580kV/cm, when pressure is 20atm, data is 780 kV/cm. So it is reasonable adopting SF 6 gas with 17atm as insulation, corresponding dielectric strength is 660 kV/cm [4].…”

Section: Structrual Design Of Tlmentioning

confidence: 99%

Design and test of 2250 kVsemi-flexible SF<inf>6</inf> insulated high voltage pulse transmission line

Wang

Liu

Song

et al. 2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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A high voltage pulse transmission line (TL) insulated by SF 6 is described which is used in high power microwave and high power pulse technology. According to requirements, we adopt compressed SF 6 gas as insulation and Polyphenylene Oxide (PPO) as support between inner and outer conductor which use corrugated structure with some depth to improve flexibility. For safety in application, stainless steel wire is used as tension component. Tests verify that attenuation of TL is 0.016dB/m when transmitting a signal with 3ns pulse width, 1kHz repetition frequency. Characteristic impedance of TL is 50ȍ. Flange and transition connecter are discussed for application. In following work, breakdown strength of SF 6 gas with different pressure under pulse high voltage will be studied in order to compare to data under AC and DC situations and achieve breakdown theory of SF 6 gas under some pulse high voltage situations.

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Compressed Gas Insulation in the Million-Volt Range: A Comparison or SF6 with N2 and CO2

Cited by 14 publications

References 21 publications

Electrical breakdown for uniform fields in compressed gases

Electrical breakdown for uniform fields in compressed gases

Negative DC Breakdown Characteristics of C₃F₇CN / CO₂ Gas Mixture for Application in High Voltage Accelerators

Design and test of 2250 kVsemi-flexible SF<inf>6</inf> insulated high voltage pulse transmission line

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Compressed Gas Insulation in the Million-Volt Range: A Comparison or SF6 with N2 and CO2

Cited by 14 publications

References 21 publications

Electrical breakdown for uniform fields in compressed gases

Electrical breakdown for uniform fields in compressed gases

Negative DC Breakdown Characteristics of C3F7CN / CO2 Gas Mixture for Application in High Voltage Accelerators

Design and test of 2250 kVsemi-flexible SF<inf>6</inf> insulated high voltage pulse transmission line

Contact Info

Product

Resources

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Negative DC Breakdown Characteristics of C₃F₇CN / CO₂ Gas Mixture for Application in High Voltage Accelerators