its a type of transformer oil which provides insulation ...
To ascertain the life of insulation, or effectiveness of the insulation (HV to LV, HV to earth and LV to earth) of the transformer
The dielectric strenght of a transformer represents the maximum voltage permissible to apply across the transformer insulation i.e. between the transformer winding to another part of the transformer, normally the chassis or another winding and without break-down of the insulation ocurring (e.g. arcing). The breakdown voltage of a transformer represents a voltage that exceeds its dielectric strenght and that causes breakdown e.g. arcing across the insulation.
time and temperature dependence of the transformer oil and its insulation paper used
Because one of its main functions is to provide good insulation.
Knowing the power rating of a transformer will help an operator use the transformer within its design limitations with regard to heating of the windings and their insulation.
It depends on the rated voltage of the transformer winding -are you talking about a 12-V transformer winding or a 400-kV transformer winding? Obviously, there is no one answer to your question!
The effect of the insulation is to stop electric currents flowing where they should not.
A megger would not be suitable for testing insulation resistance of a 13.2-kV transformer, as the transformer's voltage rating is significantly higher than the output voltage from a megger.
If you exceed the rated voltage of your transformer, there is a high possibility that its insulation will break down and you will ruin that transformer.
Basic materials to build a transformer are magnet wire, iron core and insulation material to separate the two windings.
Sure. No transformer is built to last forever. Aging and operations will weaken the insulation with time.