Parameter dependence of gaseous insulation in SF&lt;sub&gt;6&lt;/sub&gt;

Bujotzek, M.; Seeger, Martin

doi:10.1109/tdei.2013.6518954

Cited by 28 publications

(49 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The systematic shift could probably be explained with a variation in the effective area due to differences in the exact geometry of the protrusion (tip radius, length) or surface variations of the tip (oxide layers, micro protrusions). The results of the Fowler-Nordheim equation [5], plotted for a field enhancement factor of β = 125 and effective areas of 10 −12 to 10 −19 m 2 (Fig. 4), support these assumptions.…”

Section: Discussionsupporting

confidence: 52%

See 1 more Smart Citation

Inception level of partial discharges in SF<inf>6</inf> induced with short X-ray pulses

Koch

Bujotzek

Franck

2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

Self Cite

View full text Add to dashboard Cite

Section: Discussionsupporting

confidence: 52%

“…Bujotzek et al show an example of a protrusion stressed with a lightning impulse (see figure 6 of [5]). In this case the appearance of an electron decides about a discharge for the technical relevant pressures between 0.35 MPa and 0.5 MPa.…”

Section: Introductionmentioning

confidence: 99%

Inception level of partial discharges in SF<inf>6</inf> induced with short X-ray pulses

Koch

Bujotzek

Franck

2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

Self Cite

View full text Add to dashboard Cite

“…The model presented by Seeger et al [12] introduces a possibility to calculate partial discharge and breakdown field strengths in various field geometries [36]. The model is based on the stepped leader propagation as introduced in section 1.…”

Section: Modelmentioning

confidence: 99%

“…The curves provided by the Fowler-Nordheim equation [44,45,11] give good agreement with the experimental results (dash-dotted lines in figure 5). For the field enhancement factor a value around β = 125 is taken for SF 6 [36,46]. The curve provided by the Fowler-Nordheim equation is quite sensitive on the factor β.…”

Section: Time Lagsmentioning

confidence: 99%

Partial discharges and breakdown in C₃F₈

Koch¹,

Franck²

2014

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Abstract. Traditional search processes of gases or gas mixtures for replacing SF 6 involve time consuming measurements of partial discharges and breakdown behaviour for several voltage waveforms and different field configurations. Recently a model for prediction of this behaviour for SF 6 was described in literature. The model only requires basic properties of the gas such as the critical field strength and the effective ionization coefficient, which can be obtained by swarm parameter measurements, and thermodynamic properties, which can be calculated. In this paper, we show for the well-known and electronegative gas octafluoropropane (C 3 F 8 ) that it is possible to transfer the model developed for SF 6 to this gas to describe the breakdown behaviour of C 3 F 8 . Thus the model can be beneficial in the screening process of new insulation gases.

show abstract

“…In defect free SF 6 GIS, the breakdown mechanism depends on the applied voltage wave shape, polarity and surface roughness and it is not generally possible to state the most critical case. Recently, a complete comparison of the parameter dependencies of the breakdown mechanism and voltage in SF 6 has been made for all technical relevant situations [56]. For this, the first electron occurrence, the streamer inception field and the leader propagation have been estimated and for each condition the most critical was selected.…”

Section: Breakdown Voltage Predictionmentioning

confidence: 99%

An Efficient Procedure to Identify and Quantify New Molecules for Insulating Gas Mixtures

Franck

Dahl

Rabie

et al. 2013

Contrib. Plasma Phys.

View full text Add to dashboard Cite

Author(s):Franck, Christian M.; Dahl, Dominik A.; Rabie, M.; Haefliger, P.; Koch, M. Publication Date: 2014 Permanent Link:https://doi.org/10.3929/ethz-a-010881816 Originally published in:Contributions to plasma physics 54(1), http://doi.org/10.1002/ctpp.201300030 Rights / License:In Copyright -Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH LibraryThis is the pre-peer reviewed version of the following article: In this contribution, a new procedure to systematically identify and quantify novel molecular gases with low global warming potential for application in high voltage insulation as gas mixtures is presented. The attention is focused on highly efficient procedures to be able to scan a large number of candidate gases. To identify new molecules, we derived an empirical correlation between the electric strength of a gas and certain molecular properties, like polarizability or dipole moment, which can be calculated by means of density functional theory. The swarm parameters of these pre-selected molecules in mixtures with buffer gases is then quantified, using a newly set-up Pulsed Townsend experiment. The setup operates with a high degree of automation to enable systematic evaluation of gas mixtures not to miss possible synergistic effects. Key element of this PT setup is a new photocathode that works with a high quantum efficiency and long lifetime even when exposed to reactive species during the measurements. Moreover, for an automated operation it is important to know precisely in which range the experiment can be operated, i.e. for example to know up to which electron density space charge effects can be neglected. Finally, the measured swarm parameters need to be translated into breakdown voltage strengths of different electrode arrangements and different applied voltage wave shapes. For this, a model of the the streamer to leader transition in SF6 will be applied to general strong electronegative gases in future studies.

show abstract

Parameter dependence of gaseous insulation in SF<sub>6</sub>

Cited by 28 publications

References 21 publications

Inception level of partial discharges in SF<inf>6</inf> induced with short X-ray pulses

Inception level of partial discharges in SF<inf>6</inf> induced with short X-ray pulses

Partial discharges and breakdown in C₃F₈

An Efficient Procedure to Identify and Quantify New Molecules for Insulating Gas Mixtures

Contact Info

Product

Resources

About

Parameter dependence of gaseous insulation in SF<sub>6</sub>

Cited by 28 publications

References 21 publications

Inception level of partial discharges in SF<inf>6</inf> induced with short X-ray pulses

Inception level of partial discharges in SF<inf>6</inf> induced with short X-ray pulses

Partial discharges and breakdown in C3F8

An Efficient Procedure to Identify and Quantify New Molecules for Insulating Gas Mixtures

Contact Info

Product

Resources

About

Partial discharges and breakdown in C₃F₈