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Wednesday, August 5, 2020 | History

2 edition of Study of breakdown phenomena in high pressure N2 and SF6. found in the catalog.

Study of breakdown phenomena in high pressure N2 and SF6.

T. K. Datta

Study of breakdown phenomena in high pressure N2 and SF6.

by T. K. Datta

  • 106 Want to read
  • 4 Currently reading

Published by University of Salford in Salford .
Written in English


Edition Notes

MSc thesis, Electrical Engineering.

ID Numbers
Open LibraryOL20905735M

Figure 2. Comparison of the insulation property of CF3I-N2 gas mixtures with SF6 and SF6-N2 mixture in highly nonuniform electric field. Seen from Figure 2, power frequency breakdown voltage of SF 6 has obvious “hump effect” as a function of pressure with the distance of 10 and 20 mm. Similarly, the increase of breakdown voltage of 20%-mixed SF 6-N 2 mixture with pressure also tends to. Corona Stabilization in SF6/N2 Mixtures Under Impulse Conditions Discussion Corona and Breakdown in Coaxial-Electrode Geometry in SF6 and SF6/N2 Mixtures Discussion A Study of Prebreakdown Processes Influencing the Volt-Time Characteristics of Gaseous Insulation Discussion Mass Spectrometry of Low Energy Ions Extracted from Medium Pressure Air.

The breakdown voltages of some electron attaching gases and gas mixtures have been calculated from their fundmental properties such as ionization and attachment cross sections, the momentum transfer cross section, the drift velocity or the mean energy of electrons. The calculated breakdown voltages in SF6, N2O, SF6+N2, and SF6+N2O gas mixtures, on the basis of Maxwellian electron energy. High-pressure phenomena, changes in physical, chemical, and structural characteristics that matter undergoes when subjected to high pressure. Pressure thus serves as a versatile tool in materials research, and it is especially important in the investigation of the rocks and minerals that form the deep interior of the Earth and other planets.. Pressure, defined as a force applied to an area, is.

Sulfur hexafluoride (SF6) is the electric power industry's preferred gas for electrical insulation and arc quenching/current interruption equipment used in the transmission and distribution of electrical energy. However, SF6 is a potent greenhouse gas and this has led to concerns regarding its long-range environmental impact. For pure SF 6 the optimal gas pressure varies between 4 and 6 bar. In order to find a suitable SF 6-N 2 gas mixture to substitute SF 6, the gas pressure has been varied in such a way that the similar lightning impulse breakdown voltage levels were obtained. In further experiments, we compared gases of corresponding dielectric strengths.


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Study of breakdown phenomena in high pressure N2 and SF6 by T. K. Datta Download PDF EPUB FB2

Recently, a high voltage and insulation group at Tokyo Electric Power Company completed a series of experiments to study the breakdown characteristics of SF 6 for non-standard lightning impulse waves associated with lightning surges and disconnector switching surges [19]-[22].

The breakdown voltage over time characteristic of SF 6 gap at. Abstract: A dual photomultiplier system and a field probe have been used to study the optoelectrical phenomena in commercially pure SF6 and mixtures of SF6 with oxygen-free N2, under impulse voltages in a point-plane gap.

The critical pressure has been estimated using an extrapolation technique, and the results have been compared with those of other recently published work.

In order to meet requirements of a low condensation temperature and to study the possibility of a cheaper insulation, mixtures of SF6 and gases like air and nitrogen have become a matter of study.

This work presents results from a study of high-pressure SF6 and SFe/N2 mixtures in the range by: From the test results it is shown that the surface resistances and breakdown voltages of the samples all decrease after corona discharge, and they are lower in SF6/N2 than SF6 View Show abstract.

A Study of the Critical Pressure in SF6/N2 Mixtures for. Get Price. Abstract: A dual photomultiplier system and a field probe have been used to study the optoelectrical phenomena in commercially pure SF6 and mixtures of SF6 with oxygen-free N2, under impulse voltages in a point-plane gap.

Figures 7(a) and 7(b) present the variation in onset voltage at the pulse stage in SF6/N2 gas mixtures under different gas pressures and gap spacings, in which the gas-mixture ratio is φ(SF 6):φ(N 2) = With an increase in gas pressure and gap spacing, the onset voltage at the pulse stage shows a clear linear-growth trend.

The critical pressure p c at which breakdown occurs at onset was the same for impulse as for dc conditions and for both cases p c was insensitive to the SF 6 content of the mixture (Fig.

If similarity is obeyed, the onset field at the high-stress electrode should be given for any geometry by the relation E/p = (E/p)iim [1+ C/fpr)3*].

Breakdown in electronegative gases, time lags for breakdown, streamer theory of breakdown in gases, Paschen’s law, Breakdown in non-uniform field and corona discharges, Post breakdown phenomena and applications, practical considerations in using gases for.

The breakdown process is observed using a high-speed camera, and the model is verified through experiments. insulation strength of SF6/N2 and C4F7N/CO2 gas mixtures is mainly performed in this.

Juhre and E. Kynast, "High pressure N2, N2/CO2 and CO2 gas insulation in comparison to SF6 in GIS applications," 14th Int'l. Sympos. High Voltage Eng., p.

The conditions for the measured breakdown results for 30/70% CF3I/CO2 [73], SF6 [], [] and air [8] were converted into the product of pressure and gap distance, pd, as shown in Figure Abstract. Recently, SF 6 has been identified as a greenhouse gas with a long atmospheric lifetime ore, recycling guidelines for SF 6 in electrical power equipment have been discussed, and the reduction of the release of SF 6 to the atmosphere has progressed addition, many researchers have investigated alternative insulation gases to SF 6 High-pressure N 2 gas is one of the.

The decomposition products of C6F12O and N2 under breakdown voltage were determined by gas chromatography–mass spectrometer (GC-MS). Test results of the kV high-pressure.

The results are reported of a study of dc breakdown between coaxial electrodes in SF 6 /N 2 mixtures at pressures up to 8 bar, in which the effects of electrode material, area and surface roughness have been examined. The mixtures showed less spark conditioning than SF 6 and were slightly less sensitive to electrode-roughness effects.

In SF 6 the results were similar whether the inner. The present study may contribute further evidence to the inadequacy of Paschen’s law in describing breakdown voltages at high pressure-distance configurations. an experimental apparatus was built to observe and record the nature of high voltage phenomena in a near-vacuum.

Analysis of Paschen Curves for air, N2 and SF6 Using the. M.O. Pace, D.L. McCorkle, and X. Waymel, Possible high pressure nitrogen-based insulation for compressed Gas Insulated Cables, IEEE Conference on Electrical Insulation and Dielectric Phenomena, ( Annual report n°95CH).

Google Scholar. ABSTRACT. The pressure dependence of the attachment rate constant of several perfluoroalkane dielectrics has been studied in buffer gases of N 2 and Ar up to a total pressure of MPa. It has been observed that the higher order perfluoroalkanes (n-C N F 2N+2; 3 ≤ N ≤ 6) exhibit a marked dependence of their attachment rate constant on the total gas pressure, particularly in the pressure.

Select PREDISCHARGE DEVELOPMENT IN N2 AND SF6 AT HIGH GAS PRESSURE. Book chapter Full a systematic breakdown study has been carried out under well controlled uniform-field conditions to investigate the electrical breakdown strength of this gas at high products (Nd), N being the real gas number density and d the electrode separation.

Deviations from the Paschen's law in air and nitrogen are investigated for gaps from nm to 10 μm, by using a high precision electrode positioning deviation is observed when electrode gaps are smaller than 4 μm at atmospheric pressure. At distances lower than 1 μm, a nearly constant average breakdown field of V/μm is evidenced in both gases with Au and Ru electrodes.

S.F. Philp. Compressed gas insulation in the million-volt range: A comparison of the sf6 with N2 and CO2. IEEE Trans., - 42) Sharbaugh, A.H., Watson, P.K.: `Departures from Paschen's law in high pressure nitrogen', Annual report of conference on.

Study high pressure hydrogen gas filled RF cell K. Yonehara MC Design Workshop 12/11/08 1. Contents 2 • Breakdown phenomena with various conditions • Procedure: N2 run → H2 run → SF6 .A Study of the Critical Pressure in SF6/N2 Mixtures for Positive Point Plane Systems with Impulse Voltages Abstrakty.

A dual photomultiplier system and a field probe have been used to study the optoelectrical phenomena in commercially pure SF6 and mixtures of SF6 with oxygen-free N2, under impulse voltages in a point-plane gap.

The critical.An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk.

Full text of "Gases for electrical insulation and arc interruption: possible present and future alternatives to pure SF6".