Distribution transformer is one of the important equipment in the power supply and distribution system of industrial and mining enterprises and civil buildings. It reduces the network voltage of 10 (6) kV or 35kV to the 230 / 400V bus voltage used by users.Such products are suitable for AC 50 (60) Hz, three phase maximum rated capacity of 2500kVA (single phase maximum rated capacity of 833kVA, generally not recommended single phase transformer), can be used in the home (outside), the capacity of 315kVA and below, ambient temperature not higher than 40℃, not less than-25℃, maximum daily average temperature of 30℃, maximum annual average temperature 20℃, relative humidity not exceeding 90% (ambient temperature 25℃) and altitude not exceeding 1000m.If it is not consistent with the above use conditions, the appropriate quota adjustment shall be made according to the relevant provisions of GB6450-86.
Transformer oil is an oil liquid, it has the possibility of combustion, and its environmental protection has disadvantages.However, due to the characteristics of excellent performance and low price, the vast majority of power transformers still use transformer oil as the insulation and cooling medium.
At the end of the 19th century, the transformer began to use transformer oil as insulation and cooling medium, the oil immersed transformer appeared, transformer oil in addition to rich natural storage, low price, transformer oil has the following characteristics, so it has been widely used.
1) Use together with fiber materials, good insulation performance, can reduce the insulation distance, reduce the cost.
2) The transformer oil has low viscosity and good heat transfer performance.
3) Can well protect the cores and windings from the moisture in the air.
4) Protect the insulation paper and insulation board from oxygen, reduce the aging of insulation materials, and prolong the life of the transformer.
With the exception of some small and medium capacity transformers and gas transformers, the vast majority of large and medium-sized transformers still use transformer oil as a cooling and insulation medium.
The insulation heat resistance grade is grade A, and the long-term working temperature is 105℃.
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