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Power transformers are essential for the electric power system, while insulating oils are essential for power transformers' insulation and cooling. 

With increasing environmental concern, vegetable oil developed with the properties of high biodegradable, low toxicity, high flash points, high fire points, lower flammability and more environmental friendly, which is also used as an insulating and cooling fluid in transformers. Here are some key benefits comparing with traditional mineral oils:

1. Better safety performance. The ignition point of vegetable oil is higher than 300°C, which is twice more than mineral oil. It can improve the fire protection performance of the transformer and ensure the safety of the power grid.

2. Longer service life. Compared with mineral oil, the life of the insulation system can be extended to 5 to 8 times.

3. Larger load. The load capacity of the transformer is more than 20% higher than that of mineral oil transformer, and the reliability is improved.

4. Environmental protection. Vegetable oil is biodegradable, non-toxic, harmless to soil and water, and green and environmentally friendly.

5. Small size, small floor space, optimized design, and reduced total cost.

In a conclusion, vegetable oils can be used as an alternative to traditional mineral-based transformer oils. The initial cost may be higher, but it is worthwhile since the long-term operational safety and environmental benefits can justify the investment.