Quantitative study on the aging of kraft paper in vegetable oils

Juan Carcedo,Carlos J. Renedo,Alfredo Ortiz,Fernando Delgado,Inmaculada Fernandez,Alberto Arroyo

doi:10.1109/mei.2016.7656808

Juan Carcedo, Carlos J. Renedo + Show 4 more

Open Access

https://doi.org/10.1109/mei.2016.7656808

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Abstract

Interest in using vegetable oils as dielectric coolants in power transformers dates back to the early studies on linseed- and castor- based fluids as possible replacements of mineral oil. However, interest in vegetable oils was lost due to their high viscosity and their tendency to oxidize. But, in the early 1990s and due to environmental concerns, the interest in dielectric fluids based on vegetable esters re-emerged. As a result, two vegetable ester– based oils were developed, namely, BIOTEMP, developed by ABB, and FR3®, developed by Cooper Power Systems.

Highlights

Interest in using vegetable oils as dielectric coolants in power transformers dates back to the early studies on linseed- and castor-based fluids as possible replacements to mineral oil
The results agree with that reported in previous research [28] showing a decrease of degree of polymerization (DP) over time and this deterioration being more pronounced at the beginning of the process and at higher temperatures
The measured DP of all three oils examined in this aging study show a strong dependence on the temperature of the test

Summary

Introduction

Interest in using vegetable oils as dielectric coolants in power transformers dates back to the early studies on linseed- and castor-based fluids as possible replacements to mineral oil. In the early 1990s and due to environmental concerns, the interest in dielectric fluids based on vegetable esters re-emerged. Two vegetable ester based oils were developed; namely, BIOTEMP® developed by ABB and FR3® developed by Cooper Power Systems. The behavior of natural esters is not yet known in detail. The International Electrotechnical Commission (IEC) created a working group (TC10 PT62975) that is charged with creating a document to define the limits of the parameters that determine the quality of a natural ester-based oil for power transformers. The document is entitled “Use and Maintenance Guidelines of Natural Ester Liquids in Electrical Equipment”

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Conclusion