Transformer oils have certain technical and chemical parameters. These parameters define the scope of oil application and use.
Dissipation factor is one of the most important indications of oil quality and is a measure of the oil’s dielectric strength. Aging causes oil to lose its functionality and poses a threat to operation of oil filled equipment. Dielectric strength testing is a safety concern and must never be neglected.
The actual dielectric strength of the oil is mostly defined by the presence of solid particles and moisture. It is therefore important to remove solid particles and water from insulation oil.
Another indication is the oil’s viscosity, which shows how efficient the oil is in terms of cooling. Oil viscosity should top out at temperatures of at least 95, 125 95, 125, 135 and 150°С for various oil types.
Setting and flashpoint temperatures indicate the allowable range of oil operation. Low setting temperatures are essential to use the oil in cold climate. High flashpoint is important for fire safety concerns.
Another important quality of the oil is its oxidation stability, i.e. the ability to maintain its properties in prolonged use. Oxidation stability is influenced by many factors, both internal (antioxidant additive, reaction with metals, formation of gas in the oil) and external (moisture, air and temperature). This parameter is important for service life of both the oil and oil filled equipment in general.
Many oils, e.g. GK and TKp contain antioxidant additive which can extend the service life of oil to 20-25 years.
Purchasing transformer oil from manufacturers and traders is not a problem these days. Each company is competing and attempting to sell at the lowest price and offer the best service.
Transformer oil is an indispensible part of insulation of electric equipment. High purity and low viscosity of the oil allow it to be used in power transformers.
Depending on the actual equipment, transformer oils function as dielectric liquid or, for instance, as arc-extinguishing media in switches.
Quality oil has high dielectric strength, low setting point, high oxidation stability, availability of convenient and practical transportation vessels. High quality oil significantly extends reliable operation of oil filled electric equipment.