Transformer oil, английский Oil suitable for use in a transformer, to dissipate heat, keep the insulation on the wire pliable and retard the oxidizing effect of the air. since it circulates between coils of wires that carry high-voltage currents, it must resist the flow of current through it from one coil to another; otherwise, the transformer short-circuits. such resistance is termed dielectric strength; oil that is extremely dry, clean and acid-free has high dielectric strength.
