Koch, Myriam ; Straumann, Ulrich ; Franck, Christian M. (2012)
Determination of waiting times between successive breakdown experiments.
2012 Conference on Electrical Insulation and Dielectric Phenomena. Montreal, Canada (14.10.2012-17.10.2012)
doi: 10.1109/CEIDP.2012.6378792
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
A common duty in high voltage engineering is the experimental determination of the breakdown voltage probability distribution of gaseous insulated electrode configurations. Due to electron detachment from negative ions in the case of electron attaching gases, the breakdown probability does not only depend on the gas and its density, but also on the ion density in the gas. If a disruptive discharge occurs in a gas gap, the number of ions in the gap is significantly increased compared to the equilibrium state at zero voltage. If the time until the next voltage application is too short, the statistical time lag will be decreased and, as a consequence, the probability of breakdown will be increased. To perform statistical independent breakdown experiments it is necessary to ensure identical ion densities in the gas gap before every new voltage application. In the literature waiting times mostly around six minutes are proposed as sufficient for ion density equalization in sulfur hexafluoride (SF 6 ). However, simulations of the behavior of SF 6 performed for the present contribution reveal that six minutes are not always sufficient to achieve statistical independent results. Especially at higher pressures longer waiting times are necessary. To investigate this problem, measurements of the natural ion pair generation in SF 6 were performed at different laboratories. Based on this data the temporal development of the ion distribution in the gas is calculated. Two cases are of interest: the changes in ion density after a disruptive discharge and in case the gap withstood the applied voltage and therefore all ions are swept out. After transformation of the temporal ion density into breakdown probability curves it is possible to estimate the necessary waiting time.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Koch, Myriam ; Straumann, Ulrich ; Franck, Christian M. |
| Art des Eintrags: | Bibliographie |
| Titel: | Determination of waiting times between successive breakdown experiments |
| Sprache: | Englisch |
| Publikationsjahr: | 13 Dezember 2012 |
| Ort: | Piscataway |
| Verlag: | IEEE |
| Buchtitel: | Annual Report: Conference on Electrical Insulation and Dielectric Phenomena (CEIDP 2012) |
| Veranstaltungstitel: | 2012 Conference on Electrical Insulation and Dielectric Phenomena |
| Veranstaltungsort: | Montreal, Canada |
| Veranstaltungsdatum: | 14.10.2012-17.10.2012 |
| DOI: | 10.1109/CEIDP.2012.6378792 |
| Kurzbeschreibung (Abstract): | A common duty in high voltage engineering is the experimental determination of the breakdown voltage probability distribution of gaseous insulated electrode configurations. Due to electron detachment from negative ions in the case of electron attaching gases, the breakdown probability does not only depend on the gas and its density, but also on the ion density in the gas. If a disruptive discharge occurs in a gas gap, the number of ions in the gap is significantly increased compared to the equilibrium state at zero voltage. If the time until the next voltage application is too short, the statistical time lag will be decreased and, as a consequence, the probability of breakdown will be increased. To perform statistical independent breakdown experiments it is necessary to ensure identical ion densities in the gas gap before every new voltage application. In the literature waiting times mostly around six minutes are proposed as sufficient for ion density equalization in sulfur hexafluoride (SF 6 ). However, simulations of the behavior of SF 6 performed for the present contribution reveal that six minutes are not always sufficient to achieve statistical independent results. Especially at higher pressures longer waiting times are necessary. To investigate this problem, measurements of the natural ion pair generation in SF 6 were performed at different laboratories. Based on this data the temporal development of the ion distribution in the gas is calculated. Two cases are of interest: the changes in ion density after a disruptive discharge and in case the gap withstood the applied voltage and therefore all ions are swept out. After transformation of the temporal ion density into breakdown probability curves it is possible to estimate the necessary waiting time. |
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektrische Energiesysteme > Hochspannungstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektrische Energiesysteme |
| Hinterlegungsdatum: | 05 Mär 2024 13:22 |
| Letzte Änderung: | 10 Jun 2024 14:15 |
| PPN: | 519014871 |
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