Title :
Dielectric response methods for diagnostics of power transformers
Abstract :
The dryness and aging state of oil-paper insulation is a key factor in both the short- and long-term reliability of a power transformer, since moisture has deleterious effects on dielectric integrity and insulation aging rates. Today, the water content of the cellulose in an in-service transformer is determined indirectly via moisture measured from oil samples, according to IEC 60422. This report summarizes the work performed by Cigre Task Force 15.01.09, and presents conclusions regarding the state of the knowledge on the applicability of the current diagnostic techniques.
Keywords :
IEC standards; ageing; electric breakdown; insulation testing; paper industry; power transformer insulation; power transformer testing; transformer oil; CIGRE Task Force 15.01.09; IEC 60422; aging state; cellulose; diagnostic techniques; dielectric integrity; dielectric response methods; dryness; oil-paper insulation; power transformer diagnostics; power transformer reliability; Aging; Dielectric loss measurement; Dielectric measurements; Dielectrics and electrical insulation; Moisture; Oil insulation; Petroleum; Polarization; Power transformer insulation; Power transformers;
Journal_Title :
Electrical Insulation Magazine, IEEE
DOI :
10.1109/MEI.2003.1203017
