Oil immersed power transformer plays an important role in the operation of power grid.

对于油浸式电力变压器来说，其内部绝缘主要由绝缘纸板和变压器油构成，因此变压器油是其重要的液体绝缘介质。

For oil immersed power transformer, its internal insulation is mainly composed of insulating paperboard and transformer oil, so transformer oil is an important liquid insulation medium.

变压器油具有灭弧、绝缘、冷却等作用，因此油的绝缘性能直接决定了变压器能否处于正常安全的运行状态。

Transformer oil has the functions of arc extinguishing, insulation and cooling, so the insulation performance of oil directly determines whether the transformer can be in normal and safe operation state.
           

研究表明，水分与温度会对变压器油的绝缘性能产生很大的影响。

The results show that moisture and temperature have great influence on the insulation performance of transformer oil.

变压器油中水分含量的加大会改变变压器内部的电场分布，能够使变压器中油纸绝缘的电气强度快速下降，加快变压器油的老化，缩短变压器油的绝缘寿命。

The increase of moisture content in transformer oil will change the electric field distribution inside the transformer, which can make the electrical strength of oil paper insulation in the transformer decrease rapidly, accelerate the aging of transformer oil, and shorten the insulation life of transformer oil.

因此，水分是除了温度外对变压器油的电气性能影响较大的因素。

Therefore, besides temperature, moisture has a great influence on the electrical performance of transformer oil.