Dielectric response methods for diagnostics of power transformers

Volume

19

Issue

3

fYear

2003

Firstpage

12

Lastpage

18

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;

fLanguage

English

Journal_Title

Electrical Insulation Magazine, IEEE

Publisher

ieee

ISSN

0883-7554

Type

jour

DOI

10.1109/MEI.2003.1203017

Filename

1203017