Determination of the thermal aging factor for life expectancy of 550 kV transformers with a preventive test

authored by

X. Zhang, Ernst Gockenbach

Abstract

It is feasible to survey actual performances of degradation for 550 kV transformers by a preventive test. By means of condition monitoring, it is possible to forecast the transformers¿ lifetime. Such data, particularly in an application where few or no failures are expected, can provide considerably more information than the failure-time data from a traditional accelerated life test. In order to develop a life model for 550 kV transformers, the effect of temperature on a thermal aging factor is taken into account since it is associated with various degradation performances of a transformer. With the aid of measurement, the thermal aging factor is analysed by the probability plot and the least-squares fitting of data so that all unknown parameters of the life model are estimated. The method will extrapolate the lifetime of large power transformers from a preventive test in practice.

Organisation(s)

High Voltage Engineering and Asset Management Section (Schering Institute)

Type

Article

Journal

IEEE Transactions on Dielectrics and Electrical Insulation

Volume

20

Pages

1984-1991

No. of pages

8

ISSN

1070-9878

Publication date

11.12.2013

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electrical and Electronic Engineering

Sustainable Development Goals

SDG 3 - Good Health and Well-being

Electronic version(s)

https://doi.org/10.1109/TDEI.2013.6678845 (Access: Closed)