The fully oil-filled and sealed corrugated oil tank shell of the three-phase oil-immersed transformer adapts to the expansion of oil with its own elasticity and is a permanently sealed oil tank. Oil-immersed three-phase transformers are widely used in power distribution equipment. The structure of a three-phase oil-immersed transformer is as follows: What exactly is it?
1. Core and bushing of three-phase oil-immersed transformer
The magnetic circuit of the three-phase oil-immersed transformer is its core. The iron core is made of silicon steel sheets, which are coated with insulating paint or an insulating oxide layer to prevent hysteresis and eddy current losses. Lead rods connect the output winding of the transformer to the external circuit. The bushing acts as an insulator between the guide rod and the tank lid and holds the guide rod in place. Casing is divided into two types: high-pressure casing and low-pressure casing.
2. Explosion-proof tubes and windings of three-phase oil-immersed transformers
The three-phase oil-immersed transformer has an explosion-proof tube attached to its outer shell. If the transformer suddenly fails, the pressure inside the tank will rise rapidly. Avoid tank explosions to avoid accidents caused by excessive pressure. After the action, the pressure in the box is released, and the contacts receive an alarm or trip.
The winding of a transformer, also called a coil, is divided into two parts: the primary winding and the secondary winding. The windings and sub-windings are made of copper wire or aluminum wire and wrapped with high-strength insulating materials. In a three-phase oil-immersed transformer, the cylindrical winding and sub-winding of each phase are installed on the same iron core column.
three. Three-phase oil-immersed transformer oil tank and oil conservator
The core and windings of the three-phase oil-immersed transformer are installed in the oil tank and then filled with transformer oil. For large capacity transformers, insert a radiator or heat pipe outside the box. The oil conservator, also known as the oil conservator, is a cylindrical container placed horizontally above the oil tank and connected to the transformer oil tank through pipes. The oil conservator accounts for approximately 10% of the fuel tank volume. The oil conservator is a capsule type oil conservator, and the oil inside is isolated from the outside air through the capsule.
