After two decades of pioneering research, Essential Energy has demonstrated that vegetable oil is not only suitable for cooking but also serves as an effective insulator for power transformers.
This groundbreaking study provides compelling evidence for the use of vegetable oil as an environmentally friendly alternative to traditional mineral oils in the energy sector.
In 2004, Essential Energy took a bold step by introducing vegetable oil as an insulating medium for transformers, particularly those located near environmentally sensitive areas.
Senior Engineer Dan Martin and Engineering Manager Lindsay McPherson spearheaded this innovative approach, which has now yielded valuable long-term data on the performance of vegetable oil in transformer applications.
“We began using vegetable oil to insulate transformers adjacent to the National Parks in 2005,” Lindsay McPherson explained.
“By 2007, we had partnered with Monash University and Ausgrid to further explore the potential of vegetable oil in our operations.”
The company has since installed 22 transformers, each containing approximately 10,000 litres of vegetable oil, along National Park borders and other strategic locations.
These installations, ranging up to 132 kilovolts, have provided a wealth of data on the oil’s performance under various conditions.
One of the key advantages of vegetable oil is its higher fire point compared to mineral oil, enhancing safety in areas prone to environmental risks or near buildings.
This property has allowed Essential Energy to deploy vegetable oil-insulated transformers in diverse locations, including a heritage site in Wagga Wagga and near an irrigation canal in Yenda.
The research team has conducted annual tests for acidity, oxidisation, and moisture exposure over the past 20 years.
The results have consistently shown that the vegetable oil’s chemical properties remain within acceptable standards, even when subjected to power outages and extreme temperatures.
Dan Martin, who completed his PhD on the suitability of vegetable oils for large power transformers, noted: “We expect about 60 years of life for the transformers. With 20 years of positive data, we’re confident they will last at least another 20-30 years.”
The success of this long-term study opens up new possibilities for the energy sector.
As the transition to renewable energy continues, plant-based oils like soybean or canola oil could find applications in various insulation needs.
“While mineral oil remains crucial for a safe and reliable electricity network, integrating plant-based oils into the energy mix can significantly contribute to more sustainable and environmentally friendly energy systems,” Martin added.
This groundbreaking research by Essential Energy not only demonstrates the viability of vegetable oil as a transformer insulator but also paves the way for more sustainable practices in the power industry.
As environmental concerns continue to shape energy policies worldwide, such innovations could play a crucial role in building a greener, more sustainable future for power distribution.
