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Comparative study of dielectric spectroscopy measurements and anayses of oil and paper samples from a transformer undergoing repair

Jörgen Blennow (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; K Walczak ; Andreas Dernfalk (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Belen Garcia ; Aleksander Bartnicki (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik)
In Proc. of 19th Nordic Insulation Symposium, Trondheim, Norway, June 13-15 (2005)
[Konferensbidrag, övrigt]

New methods, based on characterisation of dielectric response measurements, for assessing moisture content of pressboard and paper are gaining ground. However, there is a need for calibrating results with results from other techniques. This communication presents results from a study of a 19.5/6.8/6.8 kV - 40 MVA power transformer, which was opened on-site during maintenance work, thus allowing for collecting paper samples. Dielectric spectroscopy measurements were conducted before and after its opening. Results were compared with measurements on oil and paper samples. These showed that the moisture levels in the interior of the solid insulation were unchanged. Further, it was found that FDS measurements gave more accurate estimates of moisture levels than estimates based on oil analyses and equilibrium curves.

Denna post skapades 2006-09-12. Senast ändrad 2017-10-03.
CPL Pubid: 7052


Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Högspänningsteknik (2005-2017)


Elektroteknik och elektronik

Chalmers infrastruktur