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Transformer Oil
Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. It is used in oil-filled wet transformers, some types of high-voltage capacitors, fluorescent lamp ballasts, and some types of high-voltage switches and circuit breakers.
The transformer coils can be designed with copper that carries a high current so that the coils become hot. Since the coil is an excellent heat conductor, transformer oil can be used to reduce the temperature of the copper coil preventing it from burning. Two types of oils are available Paraffinic oil and Naphthenic oil:
- Paraffinic oil is a mineral insulating oil derived from special crudes and contains a substantial amount of n-paraffin. Paraffin oil has less oxidation and has a boiling point of about 530°C. Due to high wax content, the pour point is high compared to naphthenic oil. Oxidation products are insoluble within the oil.
- Naphthenic oil is a mineral insulating oil derived from particular crudes which contain very low n-paraffin. Naphthenic oil has a boiling point of about approximately 425°C. This oil is comparatively more readily corroded than paraffinic oil. Due to less wax content, the pour point is less compared to paraffinic oil. The oxidation products are soluble within the oil.
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There are certain properties to meet for an oil to be used as transformer oil. They are listed below:
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