Abstract
Increasing demand of electricity and high consumption of natural fuel resources has raised countless challenges for the electricity industry. For years, transformers were equipped with mineral oil for better and lasting performance but the recent uncertainty about the future of oil availability is motivating the researchers to find out the “Green Insulating Oils” for transformers. Thus, green insulating oils are being probed with great interest at research centers worldwide. In this paper, Canola oil was studied for applications in transformers as a sustainable solution. The paper also compared the proposed oil with mineral oil by studying the initiation and propagation of streamers in the oils when subjected to standard lightning impulse voltages. It also presents experimental results of a comparative study of initiation and propagation of streamers in canola seed based oil and mineral insulating oil when subjected under standard lightning impulse voltages. Moreover, streamer patterns, modes of propagation and their stopping lengths were investigated under both polarities of voltage in point-plane electrode gap. The paper concludes with six different findings, which states that canola oil is a better and sustainable choice of oil for transformer use. Key words: Breakdown, impulse voltage, oil, seed based insulating oil, streamer propagation.
Highlights
Mineral oil based dielectric fluids are applied in a large variety of electrical power equipment
Results presented here are for the streamers in Canola oil that were captured using both polarities of standard lightning impulse voltages (1.2/50 μs)
This paper has reported on streamer initiation and their propagation in seed based Canola oil and mineral insulating oil used in transformers
Summary
Mineral oil based dielectric fluids are applied in a large variety of electrical power equipment. 0.0011 0.01 2.2 2.05 al., 2005; Perrier et al, 2004) In this context, the vegetable seed oils are natural products and have renewable sources with plenty of supply and present suitable “green products” that can replace the mineral based oils. The vegetable seed oils are natural products and have renewable sources with plenty of supply and present suitable “green products” that can replace the mineral based oils Their most attractive features are the high biodegradability (95 to 100%) and higher fire point (~360°C) instead of ~160°C for most mineral based insulating oils. The first commercial product was BIOTEMP, patented in the U.S in September 1999 by ABB Another U.S patent was issued in September 1999 for transformer oil which uses regular soybean oil. Another U.S patent was granted to Cooper Industries, Inc. under the trademark of Envirotemp FR3 (Moumine et al, 1995)
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