The core-coil of the transformer transmits high voltage and current. The encompassing structure is dispersed by the core-coil. A particular distance is preserved from the core-coil that's known as"Electrical Clearance". In addition to the ambient medium is kept electrical isolated (dielectric) that cost can't pass through the medium. You can get navigated here to find the best Transformer Oil testing for your industry.
With the atmosphere as a surrounding dielectric medium, the electric clearance has to be high. Hence a transformer becomes big and bulky. Plus with heavy pressures like in malfunction conditions the atmosphere may lose its own dielectric property getting ionized or electrically conductive.
On the other hand, the dielectric and heating of liquid vitamin or transformer oil are a lot greater compared to the atmosphere. Therefore for a compact layout transformer oil is a much better option for transformer dielectric medium.
A dielectric material (or in brief dielectric) is an electrical insulator that may be polarized by an applied electric field. When a dielectric is placed in an electric field, electrical charges don't flow throughout the material.
Why transformer oil is used in transformer
Mineral oil enclosing a transformer core-coil gathering known as"Transformer petroleum" enriches the dielectric strength of this twisting and prevents oxidation of the center. Dielectric improvement happens because oil has a higher electric resistance than air and since the dielectric constant of oil is much closer to that of their insulating material.