Oil-immersed transformer, also known as an oil-filled transformer, is a voltage conversion device that uses oil cooling to reduce the temperature of the transformer. Unlike dry-type transformers, the main body of an oil-immersed transformer is installed in a welded steel tank filled with insulating oil.
The low-voltage windings of oil-immersed transformers generally adopt a cylindrical structure with copper foil wound around the shaft, except for the small-capacity copper wire; the high-voltage winding adopts a multilayer cylindrical structure to balance the ampere-turns distribution of the winding and reduce the magnetic leakage. High mechanical strength, strong short circuit resistance.
Since the oil-immersed transformer is immersed in the oil tank, if oil sprays or leaks, it may cause a fire. Therefore, oil-immersed transformers are usually used in separate rooms or external locations. If the climate in the installation area is relatively hot and humid, oil-immersed transformers are also a good choice.
When the oil-immersed transformer is in operation, the heat of the coil and the iron core is first converted into insulating oil, and then into the cooling medium. According to the capacity, it can be divided into an immersed natural cooling transformer and immersed forced air cooling transformer.
Usually used for line inverter
Power transformer overhaul and assembly work are best carried out in the inspection room. If there is no maintenance room, you need to choose a temporary installation place. It is best to choose a place near the foundation platform of the transformer to make the transformer in place, or it can be installed on the foundation platform on site. There should be a tent on the outdoor site. The temporary installation site must be easy to transport, the road should be flat, with sufficient width, the ground should be solid, flat and dry, away from smoke windows and water towers, and the distance from nearby buildings should meet the fire protection requirements.