What is the specific resistivity of transformer oil in power transformers?

The specific resistivity of transformer oil in power transformers typically ranges from 10^12 to 10^14 ohm-cm at room temperature. This high resistivity is crucial for minimizing electrical losses and preventing short circuits within the transformer. The specific resistivity can be influenced by factors such as temperature, moisture content, and the presence of impurities, which can degrade the insulating properties of the oil.