Introduction of a new fully biodegradable dielectric fluid

The development of a vegetable oil based fully biodegradable dielectric fluid for use in electrical equipment is described. The starting material was a high oleic vegetable oil which was further purified and stabilized. A battery of evaluation tests and performance tests were conducted which confirmed the applicability of the fluid in equipment such as distribution transformers for prolonged use. The fluid belongs to the class of less flammable liquids due to its high flash and fire points. It is considered environmentally friendly due to its very high biodegradability. It is a possible alternative to the currently used fluids such as mineral oil and silicone which have low biodegradability.