Title :
Advanced Applications of Polarisation / Depolarisation Current Analysis on Power Transformers
Author_Institution :
Indep. High Voltage Diagnostics Consultant, Auckland
Abstract :
One case study in this paper shows how to identify wet insulation system in an on-load tap changer (OLTC) by polarisation / depolarisation current (PDC) analysis. It emphasizes the importance of filling a new transformer with good oil having very low conductivity. The other two case studies on transformers without oil (before oil refilling) demonstrate how aging type of solid insulation can be identified by the PDC technique.
Keywords :
ageing; current transformers; dielectric polarisation; power transformer insulation; aging type; dielectric polarisation response; on-load tap changer; polarisation-depolarisation current analysis; power transformers; solid insulation; wet insulation system; Aging; Conductivity; Filling; Oil insulation; On load tap changers; Petroleum; Polarization; Power transformer insulation; Power transformers; Solids;
Conference_Titel :
Electrical Insulation, 2008. ISEI 2008. Conference Record of the 2008 IEEE International Symposium on
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4244-2091-9
Electronic_ISBN :
1089-084X
DOI :
10.1109/ELINSL.2008.4570376
