Detecting aging by-products of SF6 using quadrupole mass spectrometry

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dc.contributor.author Dervos Constantine, T en
dc.contributor.author Papaioannou Ioanna, C en
dc.contributor.author Michaelides Joseph, M en
dc.date.accessioned 2014-03-01T02:41:22Z
dc.date.available 2014-03-01T02:41:22Z
dc.date.issued 1997 en
dc.identifier.issn 00849162 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/30464
dc.subject Epoxy Resin en
dc.subject Isotope Ratios en
dc.subject Mass Spectrometry en
dc.subject Power Plant en
dc.subject Quality Control en
dc.subject Current Transformer en
dc.subject.other Aging of materials en
dc.subject.other Carbon dioxide en
dc.subject.other Mass spectrometry en
dc.subject.other Sulfur compounds en
dc.subject.other Detection limits en
dc.subject.other Sulfur hexafluoride en
dc.subject.other Electric insulating materials en
dc.title Detecting aging by-products of SF6 using quadrupole mass spectrometry en
heal.type conferenceItem en
heal.identifier.primary 10.1109/CEIDP.1997.641138 en
heal.identifier.secondary http://dx.doi.org/10.1109/CEIDP.1997.641138 en
heal.publicationDate 1997 en
heal.abstract Quadrupole Mass Spectrometry (QMS) has been used to validate the condition of the operating gas in a SF6 GIS 150 kV indoor power substation, running under periodic maintenance for almost 30 years. The switches of the examined system were of the dead tank, single phase, double pressure type. The employed analyzer head enabled detection of positive ions having maximum mass to charge ratio 200 and a minimum detectable concentration 0.5 ppm. According to the experimental results, before the periodic maintenance process the 34S concentration had been increased by a factor of 2 (natural abundance of isotope 34S is 4.5%). Additionally significant amounts of CO2 could be detected in gas volumes enclosing the current transformers. One month after the periodic maintenance process, i.e. gas dehydration, chamber cleaning and filter substitution, the S isotopic ratios were back to normal and the CO2 concentration was not detectable. In the event of permanent damage of solid insulants (i.e. presence of aluminum fluorides diffused in the epoxy resin) CO2 concentration was still increased at higher concentrations than the CO2 in atmosphere while the dew point measurements did not reveal the weakness. Other SF6 by-products and their concentrations could also be detected with the above measuring instrument (i.e. SF5+, SF4+, SF3+, SF2+, SF+, S+, F+, H2O+, HO+, SOFx+, SO2Fx+) and therefore it may be used as a quality control tool of GIS power plants. en
heal.publisher IEEE, Piscataway, NJ, United States en
heal.journalName Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report en
dc.identifier.doi 10.1109/CEIDP.1997.641138 en
dc.identifier.volume 2 en
dc.identifier.spage 571 en
dc.identifier.epage 574 en

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