The Development History Of Oil-immersed Transformers

Transformer oil is a petroleum-based liquid that is likely to burn and has disadvantages in terms of environmental protection. However, due to its excellent performance and low price, most power transformers still use transformer oil as an insulating and cooling medium.
At the end of the 19th century, transformers began to use transformer oil as an insulating and cooling medium, and oil-immersed transformers appeared. In addition to its abundant natural storage and low price, transformer oil has been widely used due to its following characteristics.
1) When used in combination with fiber materials, it has good insulation performance, can reduce insulation distance and reduce costs.
2) Transformer oil has low viscosity and good heat transfer performance.
3) It can well protect the core and windings from the influence of moisture in the air.
4) Protect insulation paper and insulation cardboard from the effects of oxygen, reduce the aging of insulation materials, and extend the life of the transformer.
Except for some small and medium-capacity transformers and gas transformers for special purposes, most large and medium-sized transformers still use transformer oil as a cooling and insulating medium.
Transformers impregnated with transformer oil have an insulation heat resistance grade of Class A and a long-term operating temperature of 105°C.