Detecting aging by-products of SF6 using quadrupole mass spectrometry

Dervos Constantine, T; Papaioannou Ioanna, C; Michaelides Joseph, M

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