Transformer oil composition and properties

Transformer oils are natural petroleum distillation, to obtain a refined mineral oil, the lubricating oil in the oil fractions was purified by acid treatment to give pure stable, low viscosity, good insulation, and good cooling liquid mcb circuit breaker compound. Commonly known as the party shed oil, light yellow transparent liquid, relative density 0.895. Freezing point <-45 ℃, the specific heat capacity of about 0.5 (cal / g * degrees) composed mainly of three kinds of hydrocarbons, mainly composed of cycloalkanes (about 80%), the other for the aromatics and alkanes. In China, air circuit breaker oil paraffin base oil, naphthenic oil. Paraffinic base oil produced in Daqing, naphthenic oil produced in Xinjiang Karamay.
Good transformer oil should be clean and transparent liquid, without sediment, suspended solids and floccules Electric transformer impurity substances. If it is contaminated and oxidation and produce the resin and sediment, transformer oily substance will deteriorate, light red color gradually changes until it becomes dark brown liquid. When the transformer is faulty, but also make the color of the oil change under normal circumstances, transformer oil was light brown when it should not be used again. In addition, transformer oil can be expressed as turbid emulsion, oil color black, dark. Transformer oil cloudy emulsion that contains water in oil. Dark oil color, indicating that the transformer oil insulation aging. Oil color black, and even coke smell, indicating that the transformer internal fault.