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Measuring picosecond flashover in pressurized sulfur hexafluoride (SF6)

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hyvönen, Petri, Dr.
dc.contributor.author Klüss, Joni Viljami
dc.date.accessioned 2012-08-31T07:27:13Z
dc.date.available 2012-08-31T07:27:13Z
dc.date.issued 2011
dc.identifier.isbn 978-952-60-4169-8 (printed)
dc.identifier.isbn 978-952-60-4170-4 (PDF)
dc.identifier.issn 1799-4934
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/4982
dc.description.abstract The exceedingly fast speed of breakdown in gas presents numerous challenges for measurement systems. Data integrity and analysis of recorded results are considerably affected by the measurement setup. In efforts to remove the effect of the measuring system and verify observations pertaining to the physical phenomenon of breakdown, two systems are compared. In addition, issues concerning the design, manufacturing and operation of high voltage pressurized spark gaps are discussed. Risetime of voltage collapse is measured in a pressurized SF6 spark gap using D-dot sensors and oscilloscopes with analogue bandwidth ranging from 6 to 30 GHz. Results from a 50 GHz series sampling oscilloscope are also presented. Inter-electrode distance is varied between 0.1 and 0.9 mm and pressure is increased from 1 to 19 bar. Breakdown voltages are measured ranging from c. 10 to 180 kV. Risetime values ranging from 50 to 800 ps and distinct variations in the voltage collapse waveform are observed. Measurements are documented and significant variables affecting the breakdown process and risetime analysis are identified. Risetime dependency to pressure, gap distance and electric field strength are presented using several analysis methods and compared to known theory. Methods to overcome or compensate the identified variables are discussed. Finally, optimal solutions for measurement systems and future research are presented. en
dc.format.extent 139
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.relation.ispartofseries Aalto University publication series. Doctoral dissertations, 53/2011 en
dc.subject.other Electrical engineering
dc.title Measuring picosecond flashover in pressurized sulfur hexafluoride (SF6) en
dc.type G4 Monografiaväitöskirja fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.department Sähkötekniikan laitos fi
dc.contributor.department Department of Electrical Engineering en
dc.subject.keyword high voltage en
dc.subject.keyword breakdown en
dc.subject.keyword flashover en
dc.subject.keyword sulfur hexafluoride en
dc.subject.keyword spark gap en
dc.subject.keyword rise time en
dc.identifier.urn URN:ISBN:978-952-60-4170-4
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.supervisor Lehtonen, Matti, Prof.

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