Estimation for a Life Model of Transformer Insulation Under Combined Electrical & Thermal Stress

Document Type

Article

Publication Date

1-1-1992

Abstract

This paper proposes a life model of power-transformer insulation; it is the Arrhenius model with a weighting factor for the enhanced reaction under combined thermallelectrical stress. Laboratory tests are used to evaluate the model's parametem. The thermal and thermaVelectrical stress aging data on Fish paper are presented and analyzed. The estimates from the life model are close to the experimental results. We hope that life model is extendable to other engineering materials. The model's parameters can be evaluated from two laboratory tests, viz, thermal aging and combined thermal/electrical aging. For the Fish paper, when thermal stress is increased by 30°C, the life is reduced by a factor of 2; at 70°C life was 238 hours and at 100°C life was 120 hours. The material life was further reduced by a factor of nearly 2 when subjected to thermallelectrical stress: at 80°C life was 200 hours whereas at 80°C and 600 Vac life was 118 hours. Electrical stress is important in accelerating the material degradation. © 1992 IEEE

Identifier

0026925892 (Scopus)

Publication Title

IEEE Transactions on Reliability

External Full Text Location

https://doi.org/10.1109/24.159823

e-ISSN

15581721

ISSN

00189529

First Page

466

Last Page

468

Issue

3

Volume

41

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