The three-phase oil-immersed transformer is fully oil-filled and sealed, which can better prevent oil leakage. Introduction of oil-immersed transformer manufacturers: The corrugated oil tank shell of three-phase oil-immersed transformer adapts to the expansion of oil with its own elasticity, and is a permanently sealed oil tank. Oil-immersed transformers have been widely used in various power distribution equipment. The core part of the three-phase oil-immersed transformer is composed of a closed iron core and a winding set on the iron core column. In addition, there are fuel tanks, oil conservators, casings, breathing apparatus, explosion-proof pipes, radiators, tap changers, gas relays, thermometers, oil purifiers, etc.
The fully oil-filled sealed three-phase oil-immersed transformer is filled and sealed to better prevent oil leakage. In this design, the corrugated tank shell adapts to oil expansion with its own elasticity and acts as a permanently sealed tank without an oil conservator. Note that conventional oil-immersed transformers still use an oil conservator and breather - confirm which type is being quoted. Oil-immersed transformers are widely used in power distribution equipment.
Core Structure
The core consists of a closed iron core and windings set on the core columns, together with the tank, oil conservator (conventional type), bushings, breathing apparatus, explosion-proof pipe, radiator, tap changer, gas relay, thermometer and oil purifier.
Advantages
1.Winding design:
the low-voltage winding uses a cylindrical copper-foil structure (copper wire for small capacities); the high-voltage winding uses a multi-layer cylindrical structure - balanced ampere-turn distribution, small magnetic flux leakage, high mechanical strength and strong short-circuit resistance.
2.Mechanical rigidity:
core and windings are separately tightened; self-locking anti-loosening nuts and a non-hanging structure withstand transport shock.
3.Low moisture:
coil and core are vacuum-dried, and the oil is processed by vacuum oil filtering and injection, reducing internal moisture to low levels.
4.Compact design:
the corrugated tank provides a breathing function that compensates for oil volume change from temperature, eliminating the conservator and reducing transformer height.
5.Oil isolation:
because the corrugated sheet replaces the conservator, the oil is isolated from the outside, preventing oxygen and moisture ingress that would degrade insulation performance.
Does an Oil-Immersed Transformer Need Oil Filtration?
Oil-immersed transformers are generally exposed to the environment during use, and the main function of the oil is heat dissipation. Distribution operating oil is usually assessed by acid value, water-soluble acidity, dielectric strength and appearance. Oil filtration matters because the radiator oil circuit has small clearances: external impurities, air contact and high working temperatures degrade the oil. If the oil is dirty, the cooling circuit becomes blocked, cooling performance drops, and major accidents such as overheating and explosion can occur.