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2021

Characteristics of applicable locations for oil immersed transformers

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Distribution transformers are one of the important equipment in the power supply and distribution systems of industrial and mining enterprises and civil buildings. Due to the excellent performance and low cost of oil immersed transformers, the vast majority of power transformers use transformer oil as insulation and cooling medium.

Oil immersed transformer

Development history of oil immersed transformers

At the end of the 19th century, transformers began to use transformer oil as insulation and cooling medium, and oil immersed transformers emerged. In addition to abundant natural storage and low price, transformer oil has been widely used due to its following characteristics.

Characteristics of oil immersed transformers

1) When used in conjunction with fiber materials, it has good insulation performance, can reduce insulation distance, and lower costs.

2) Transformer oil has low viscosity and good heat transfer performance.

3) It can effectively protect the iron core and winding 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 transformers.

At present, except for some small and medium-sized transformers and gas transformers with special purposes, the vast majority of large and medium-sized transformers still use transformer oil as a cooling and insulation medium.

Transformers impregnated with transformer oil have an insulation heat resistance level of Class A and a long-term operating temperature of 105 ℃.

Applicable places for oil immersed transformers

1. Non enclosed oil immersed transformers: mainly including S8, S9, S10 and other series products, widely used in industrial and mining enterprises, agriculture and civil buildings.

2. Enclosed oil immersed transformers: mainly including S9, S9-M, S10-M and other series products, commonly used in places with high oil pollution and chemical substances in the petroleum and chemical industries.

3. Sealed oil immersed transformers: mainly including BS9, S9-, S10-, S11-MR, SH, SH12-M and other series products, can be used for power distribution in various places such as industrial and mining enterprises, agriculture, civil buildings, etc.

Principle of dry-type transformer

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Principle of dry-type transformer

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