Breakdown of environmentally friendly insulating liquids

Williamson, C. and Timoshkin, I. and MacGregor, S. and Wilson, M. P. and Given, M. J. and Sinclair, M. and Jones, A. (2020) Breakdown of environmentally friendly insulating liquids. In: Defence and Security Doctoral Symposium 2020, 2020-11-10 - 2020-11-10, Cranfield University.

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Abstract

The present work details experiments conducted using impulse voltages of negative polarity to investigate the breakdown parameters (breakdown voltage and time to breakdown) of interfaces formed by dielectric liquids and a selection of polymer dielectrics. Samples of Nylon 66, Polymethylmethacrylate (PMMA), and Polyvinylidene difluoride (PVDF) were tested with: a synthetic ester, MIDEL 7131; a natural ester, Envirotemp FR3; and a naphthenic liquid, Shell Diala S4 ZX (used for benchmarking). Experimental results from this work show that, under the studied test conditions, the solid-liquid interfaces formed by the selected solid dielectrics and ester fluids exhibit comparable dielectric strengths to those formed with the naphthenic oil under investigation.

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