Dc Voltage Breakdown of SF6-Air and SF6-CO2 Mixtures in Rod-Plane Gaps

Malik, N. H.; Qureshi, A. H.; Safar, Yousef A.

doi:10.1109/tei.1983.298701

Cited by 18 publications

(14 citation statements)

References 1 publication

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“…The dependence of BDV on the voltage polarity and pressure is influenced by corona discharges (corona stabilized region) under low pressures. As the pressure increases beyond Pc, the corona onset voltage and BDV are comparable [10]. Transition…”

Section: B Effect Of Pressurementioning

confidence: 97%

“…The effect of gas pressure depends upon DC voltage polarity. This is linked to the corona stabilization region up to the critical pressure, Pc at which breakdowns and corona discharges will coincide [9], [10]. In the corona stabilization region under low pressure, it is more likely for negative BDVs to be higher than positive in non-uniform fields.…”

Section: Introductionmentioning

confidence: 99%

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Effects of DC Polarity and Field Uniformity on Breakdown of SF₆ and C₃F₇CN/CO₂ Mixture

Bahdad

Chen

Ranjan

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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To address issues of greenhouse gases and resultant global warming, there is an urgency to finding an electronegative gas to replace SF6 in global power system networks. This paper provides an experimental study of various factors on DC breakdown of electronegative gases. Rod-plane geometries with a range of rod diameters (3.5-12.5 mm) and electrode separations (5-55 mm) are used to provide different degrees of field uniformity. SF6 and a 20% C3F7CN / 80% CO2 mixture are tested under pressures ranging between 1 and 5 bar. Breakdown voltages under both polarities rise linearly with gap distance in quasi-uniform fields with the positive being higher. Increasingly non-uniform fields lead to saturation in the case of positive breakdown voltage, while in the negative polarity case the breakdown voltage increases linearly. As a result, the two polarities' breakdown voltage magnitudes crossover as field non-uniformity increases. The value at which the negative value exceeds the positive is dependent on the field uniformity, pressure and gas medium. A simulation based on the streamer criterion model provides a good agreement with experimental results for positive DC breakdown in the range of 2 to 5 bar. In terms of the insulation characteristics, 20% C3F7CN / 80% CO2 could provide a valuable alternative to SF6 in high voltage plant for outdoor applications in hot-climate countries and indoors for cold-climate countries.

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Section: B Effect Of Pressurementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effects of DC Polarity and Field Uniformity on Breakdown of SF₆ and C₃F₇CN/CO₂ Mixture

Bahdad

Chen

Ranjan

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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“…Relevant scholars around the world have carried out a considerable of research on the breakdown characteristics of SF 6 and achieved fruitful results. The investigations on factors, such as forms of applied voltage (including impulse, steady-state, or DC) [26]- [28], field distributions [29]- [30], voltage waveform parameters [30]- [32], and voltage polarities [33] affecting the breakdown characteristics of SF 6 were performed. The models of breakdown of SF 6 in inhomogeneous gaps were established and the mechanisms were clarified [27], [34], [35].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Electric Field Inhomogeneity on Repetitive Performance of a Corona-Stabilized Switch

Huang

Yang

2020

IEEE Access

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The corona-stabilized switch has a great potential in pulsed power systems where high pulse repetition frequencies are required. Corona discharge in SF 6 in highly inhomogeneous electric field is utilized to improve repetitive performance of this kind of switch. To clarify how the repetitive performance (insulation recovery and repetitive breakdown stability) of the switch depends on the field inhomogeneity, the insulation recovery and repetitive breakdown stability of a corona-stabilized switch are experimentally investigated and theoretically analyzed. An innovative double-pulse method combining breakdown voltage and discharge channel images is used to measure the insulation recovery of the switch. For different electrodes, their voltage jitters at pulse repetition frequencies of 1-2000 Hz are measured to illustrate the stability of repetitive breakdown. The experimental results are theoretically analyzed from the memory effect and behavior characteristics of the residual plasma, the critical volume and its dynamic characteristics. The results reveal the corona stabilization enhancement effect during the repetitive breakdown in SF 6 in extremely inhomogeneous field. The influence of electrode profile on the propagation of discharge channel shock wave, the decay of residual plasma and the recovery of neutral gas density are clarified. Effect of the electrostatic conditions, including the critical volume and its dynamic characteristics, and the intensity of corona discharge, on the repetitive performance of the switch are also clarified. INDEX TERMS Corona stabilization, electric field inhomogeneity, gas discharge devices, insulation recovery, memory effect.

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“…The experiments are usually done in order to obtain the breakdown value of voltage under different type of voltage and electrode geometry [10][11][12][13][14][15]. In numerical modelling, simulation models are built and solved to acquire some microscopic parameters of discharge and study the principles of the discharge [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Studies of the Electrical Discharge Characteristics of Sulfur Hexafluoride

Radmilović-Radjenović¹,

Radjenović²

2017

Journal of Electrical Engineering and Technology

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-This paper contains results of the theoretical studies of the electrical breakdown properties in sulfur hexafluoride. Since the strong interaction of high-energy electrons with the polyatomic sulfur hexafluoride molecule causes their rapid deceleration to the lower energy of electron capture and dissociative attachment, the breakdown is only possible at relatively high field strengths. From the breakdown voltage curves, the effective yields that characterize secondary electron productions have been estimated. Values of the effective yields are found to be more consistent if they are derived from the experimentally determined values of the ionization coefficient and the breakdown voltages. In addition, simulations were performed using an one-dimensional Particle-in-cell/Monte Carlo collision code. The obtained simulation results agree well with the available experimental data with an error margin of less than 10% over a wide range of pressures and the gap sizes. The differences between measurements and calculations can be attributed to the differences between simulation and experimental conditions. Simulation results are also compared with the theoretical predictions obtained by using expression that describes linear dependence of the breakdown voltage in sulfur hexafluoride on the pressure and the gap size product.

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Dc Voltage Breakdown of SF6-Air and SF6-CO2 Mixtures in Rod-Plane Gaps

Cited by 18 publications

References 1 publication

Effects of DC Polarity and Field Uniformity on Breakdown of SF₆ and C₃F₇CN/CO₂ Mixture

Effects of DC Polarity and Field Uniformity on Breakdown of SF₆ and C₃F₇CN/CO₂ Mixture

The Influence of Electric Field Inhomogeneity on Repetitive Performance of a Corona-Stabilized Switch

Theoretical Studies of the Electrical Discharge Characteristics of Sulfur Hexafluoride

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