Assessment of the effect of commercial vegetal oils on Kraft paper ageing through mechanical characterization

Fernández Diego, Cristina; Ortiz Fernández, Alfredo; Fernández Diego, Inmaculada; Carrascal Vaquero, Isidro Alfonso; Renedo Estébanez, Carlos J.; Delgado San Román, Fernando

doi:10.1109/TDEI.2018.007231

Ver/Abrir

AssessmentofTheEffect.pdf (224.9Kb)

Identificadores

URI: http://hdl.handle.net/10902/15048

DOI: 10.1109/TDEI.2018.007231

ISSN: 1558-4135

ISSN: 1070-9878

Fecha

2018-10-08

Derechos

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publicado en

IEEE Transactions on Dielectrics and Electrical Insulation, 2018, 25(5), 1880-1887

Editorial

Institute of Electrical and Electronics Engineers Inc.

Enlace a la publicación

https://doi.org/10.1109/TDEI.2018.007231

Palabras clave

Kraft paper

Power transformer

Thermal ageing

Tensile test

Degree of polymerization

Vegetal oil

Resumen/Abstract

Vegetal oils are considered a suitable substitute for mineral oil that is widely used in power transformers as insulation and cooling medium. Due to the fact that more and more power transformers containing this alternative insulating fluid are being constructed a mathematical ageing models is needed to help predict transformer failures. The continued performance of power transformers depends on the condition of its paper insulation mainly. In this sense, this paper analyses Kraft paper degradation through the loss of its mechanical strength. Accelerated thermal ageing test of the paper in two different vegetal oils were carried out at three temperatures during diverse periods of time, in order to obtain information on the kinetics of the ageing degradation of the paper. The evolution of the mechanical properties of paper failure are analysed as a function of temperature and ageing time. In addition, the results obtained are compared with the traditional method of degradation analysis, based on the measurement of the degree of polymerisation.