Oil-immersed transformers are a new type of high-performance transformer with a more rational structure and superior performance. The three core legs of the three-dimensional wound core are arranged in an equilateral triangle, creating a magnetic circuit with no air gaps, resulting in a tighter winding. The three magnetic paths are of uniform length and are all the shortest possible, and the cross-sectional area of the core legs is closer to a circle. This further improves performance, reduces losses, lowers noise, achieves three-way balance, and reduces third harmonic components. This product is particularly suitable for power grid upgrades in urban and rural areas, industrial and mining enterprises, and is particularly suitable for combined transformers and prefabricated substation transformers.
Oil-immersed transformers use oil as the primary insulation and oil as the cooling medium, with various cooling methods including oil-immersion self-cooling, oil-immersion air cooling, oil-immersion water cooling, and forced oil circulation. The main components of a transformer include the core, windings, oil tank, oil pillow, breather, explosion-proof pipe (pressure relief valve), radiator, insulating bushing, tap changer, gas relay, thermometer, oil purifier, etc. Oil-immersed transformers are quiet because the oil between the silicon steel sheets is immersed in the transformer for a long time. The elasticity of the transformer oil acts as a buffer, which allows the transformer to penetrate the layers. However, the voltage regulator is located inside the oil tank, and the contact between the switch and the transformer is not visible from the outside. If the switch fails to make contact, the circuit is open. Poor contact can easily burn out when the load is too heavy.