Title :
Identification of overheating in transformer solid insulation by polarization depolarization current analysis
Abstract :
This article shows how the on-site off-line electrical diagnostic technique, Polarization Depolarization Current (PDC) analysis, identifies and locates overheating / thermal fault in transformer solid insulation. The method is particularly useful for transformers using coated paper of any kinds since the determination of Degree of Polymerization (DP) in paper and the Furanic compounds in oil become impossible. In order to tell more precisely how severe the solid insulation is thermally aged, the Depolarization Index (dP.I.) is here introduced and discussed.
Keywords :
ageing; dielectric depolarisation; dielectric polarisation; fault location; paper; polymerisation; power transformer insulation; power transformer testing; transformer oil; Furanic compounds; PDC; ageing; coated paper; degree of polymerization; depolarization index; off line electrical diagnostic technique; overheating; polarization depolarization current analysis; thermal fault location; transformer solid insulation; Aging; Oil insulation; Partial discharges; Power transformer insulation; Solids; Windings; absorption; conduction; depolarization; insulation; overheating; polarization; pressboard;
Conference_Titel :
Electrical Insulation Conference (EIC), 2013 IEEE
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4673-4738-9
Electronic_ISBN :
978-1-4673-4739-6
DOI :
10.1109/EIC.2013.6554286