CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Sequential Comparative Study of Dielectric Response and Analyses of Oil and Paper from a Power Transformer Undergoing Repair

Jörgen Blennow (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Andreas Dernfalk (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; K Walczak ; Chandima Ekanayake (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Paul Koestinger ; Lennart Karlsson ; Uno Gäfvert ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Aleksander Bartnicki (Institutionen för material- och tillverkningsteknik, Högspänningsteknik)
In Proc. 14th International Symposium on High Voltage Engineering (2005)
[Konferensbidrag, refereegranskat]

Methods, based on characterisation of dielectric response, for assessing moisture content in pressboard and paper are gaining ground. However, there is a need for calibrating obtained results with results from other techniques. This communication presents results from a study of a 50/10 kV - 40 MVA power transformer, which was sent to a workshop for repair, thus allowing for collecting samples of the solid insulation. Dielectric spectroscopy measurements in frequency domain were conducted at several occasions before and after the repair. Moisture estimation based on dielectric response measurements as well as on titration of oil samples yielded similar results to those obtained by direct titration of paper samples, as long as appropriate temperature values were used in all the analyses mentioned. The temperature value during measurements should be used for the analysis of the dielectric response, while in-service temperature of oil should be used for the evaluation based on Karl Fisher titration.



Denna post skapades 2006-09-12.
CPL Pubid: 7051

 

Institutioner (Chalmers)

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

Ämnesområden

Elektroteknik och elektronik
Materialteknik

Chalmers infrastruktur