Introduction to oil-immersed transformer
What is an oil-immersed transformer?
Oil-immersed transformer,with oil as the main insulation means of transformer, and rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling and forced oil circulation. The main parts of transformer are core, winding, oil tank, oil pillow, breathing apparatus, explosion-proof tube (pressure relief valve), radiator, insulation sleeve, tap switch, gas relay, thermometer, oil purifier and so on. Oil immersed transformer silicon steel sheet layer, due to long-term immersion transformer, oil can penetrate into it, and the transformer oil has elastic buffer effect, so the oil immersed transformer noise is small. However, the pressure regulating switch is in the tank, and it is good that the contact of the switch can not be seen outside when the pressure regulating. If the contact is not on, it is equal to the circuit opening. If the contact is poor, the switch is easy to burn when the load is too large.
Structure and application of oil-immersed transformer
Oil-immersed transformer is a kind of structure is more reasonable, more excellent performance of new high-performance transformer, the three-dimensional volume core due to its three core column is the three-dimensional arrangement of an equilateral triangle, no air gap in the magnetic circuit, winding closer, three length of magnetic circuit, and is the shortest, core core column cross-sectional area is more close to the circular, thus to further improve performance, reduce loss, noise reduction, Three BALANCE, reduce the third harmonic component, the product is more suitable for urban and rural, industrial and mining enterprises power grid transformation, more suitable for combined transformers and preassembled transformer substation transformers.
Cooling mode of oil-immersed transformer
(1) Oil-immersed transformers usually adopt three cooling modes: oil-immersed self-cooling, oil-immersed air-cooling and forced oil circulation.
(2) The oil-immersed self-cooling type relies on the natural convection of the oil to take away heat. The oil-immersed air-cooled type is based on the oil-immersed self-cooled type, and a fan is added to blow air to the oil tank and tubing to strengthen the heat dissipation. The forced oil cycle is to pump the hot oil in the transformer outside the transformer for cooling and then send it to the transformer.
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