China Three-Phase Oil-Immersed Distributing Transformer From GNEE

‌Product Introduction
The three-phase oil-immersed distribution transformer is a transformer with a fully oil-filled sealed corrugated oil tank shell. Its core part consists of a closed iron core and a winding sleeved on the iron core column. In addition, the three-phase oil-immersed distribution transformer also includes oil tanks, oil storage cabinets, bushings, respirators, explosion-proof pipes, radiators, tap switches, gas relays, thermometers and oil purifiers. ‌

Oil-immersed transformer working principle
The working principle of the three-phase oil-immersed distribution transformer is based on electromagnetic induction. Its core part is the closed iron core and winding. The iron core is stacked with silicon steel sheets, and the surface is coated with insulating paint or the surface oxide film is used to insulate the sheets from each other. The winding is divided into a primary winding and a secondary winding. The primary winding is connected to the power supply and the secondary winding is connected to the load. The transformer converts high voltage into low voltage through electromagnetic induction to achieve voltage conversion and transmission. ‌

Three-phase transformers are classified by cooling method: ‌
‌Natural oil circulation natural cooling (oil-immersed self-cooling): suitable for small-capacity transformers. ‌ ‌Natural oil circulation air cooling (oil-immersed air cooling): suitable for medium-capacity transformers. ‌Forced oil circulation water cooling: suitable for large-capacity transformers‌

Three-phase power distribution application scenarios and maintenance
Three-phase oil-immersed distribution transformers are widely used in industrial and mining enterprises and civil building power supply and distribution systems to reduce the 10kV or 35kV network voltage to the 230/400V bus voltage used by users. This type of transformer is suitable for AC 50Hz or 60Hz, with a maximum three-phase rated capacity of 2500kVA. It can be used indoors and outdoors, and can be installed on poles when the capacity is 315kVA and below. Its working environment temperature range is -25℃ to 40℃, the relative humidity does not exceed 90%, and the altitude does not exceed 1000m‌

In order to ensure the normal operation of the transformer and extend its service life, regular inspection and maintenance are necessary. This includes checking the oil level, oil quality, temperature and the working status of each component, timely cleaning the oil tank and cooling system, replacing aging components, etc.‌

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