The oil immersed power transformer is used for regulating voltage and AC power transmission. The advantages include small dimension, reasonable price, strong weather resistance and so on. It is applicable to power systems, industrial and mining enterprises, transportation, post and telecommunications sector, research institutes, etc.Smart and diverse structures and nice appearance make this product to meet the needs of different users.
You can find more information on our web, so please take a look.
Features：
High-quality grain-oriented cold-rolled silicon steel sheet are employed, and the whole oblique non-porous banding structure are used here. The core has a multi-level ladder shape, with three joints or five joints, which is of low no-load loss and low noise. Rolled cores are direct rolled by certain special equipment, which gives the advantages including no seam, no corner weight, reluctance reduction, low no-load loss. Amorphous alloy is an advanced core material, which leads to an average reduction of 72% no-load loss and a reduction of 50% no-load current.
The high-quality QQ acetal enameled round copper wire and oxygen-free copper rod are used to form the coil. The coil type includes cylinder type, continuous type, new type spiral type, split type, etc. It has sufficient electrical strength, mechanical strength and cooling capacity.
In order to increase the capacity of anti-short-circuit of the transformer, self-adhesive transposition wire is used in the 35kV and above windings. The wire is made of self-adhesive acetal enameled flat wire, and after winding into a coil, it is heated so that the flat wire could be bonded between each other to form a rigid coil, which can withstand greater bending stress, thereby enhancing the capacity of anti-short-circuit of the transformer. The most important feature of the self-adhesive transposition wire is that it can reduce the loss of the transformer, and as a result of multi-stranded conductor with transposition, the eddy current loss and circulation loss are greatly reduced, it can also reduce the temperature rise of the partial hot spots of winding, thus the winding temperature distribution is more uniform.
Oil tank
The oil tank is made of high quality steel plate, and the shape includes elliptical shape, rectangular shape, etc. The type of the radiator includes: corrugated sheet type radiator, expansion type radiator and corrugated type tank. The sealing performance test is conducted on oil tanks. The inside and outside surfaces are pickling and phosphate treated, and then spray priming paint for three times and surface paint for one time, which give its corrosion resistance.
Oil transformers use mineral oil as the heat dissipation and insulation medium. This is a widely used electrical equipment in the world. Most of the transformers in today's power transmission systems are oil-cooled. There are two main types of oil transformers: Open-type transformers (Conservator type transformers) and Sealed-type transformers (Hermetically sealed type transformers).
Cooling oil according to the principle of heat generated by the coil and magnetic core during operation will transfer to the oil. The temperature of the oil will spread out to the outside through the transformer's metal shell.
Goto Tongdian to know more.
Oil-immersed transformers consist of the magnetic core, windings and bushings. The magnetic core provides a path for magnetic flow. Windings create a magnetic field and consist of a conductor coil, wrapped around the core and insulated with press board barriers and screens. The thickness of the winding insulation increases with voltage. Bushings connect transformer windings to a substation. A characteristic feature of an oil-immersed transformer is the oil conservator. It simplifies operation by monitoring the oil level in a tank and providing space for thermal expansion of the oil.
Moreover, the minimum net distance between the outer profile of the fuel oil-immersed transformer and the wall and door of the transformer room also has strict distance requirements. The various civil structures, fire barriers and storage tanks of oil-immersed power transformer substations are designed because of the flammability and liquidity of oil. In addition, "when the transformer room is located in the building, the door shall be a Class A fire door." In this way, the construction investment designed to prevent fire in each substation is naturally much larger.
Advantages of Oil-immersed transformers compared to Dry-type transformers
- The cost of procuring an oil transformer is usually 1.5 to 2 times lower than a dry transformer for the same capacity.
- Dry transformer' epoxy resin has poor heat dissipation performance than mineral oil.
- In general, the dry transformer's heat dissipation is inferior to that of the oil transformer, so the capacity of the dry transformer usually only meets the need for power distribution from the intermediate station to the end-consumption site. Also, on the grid system, oil transformers are more versatile (including transmission and distribution transformers).
- The dry-type transformer is usually suitable for voltages below 35 kV while oil-immersed are unlimited.
- The temperature monitoring of the dry transformer depends on the temperature sensor mounted inside the machine's body, so the obtained temperature is the temperature of a particular location, the temperature reflected by the screen is not the exact mean temperature. The transformer insulation oil conducts heat relatively evenly. The temperature reflected by the monitor can be considered the average temperature.
- Because of the monolithic casting structure of the dry transformer, compared with the ability to repair, recover, utilize, the oil transformer is more dominant. The insulating material of the machine dries out over time will age, and defects will accumulate. In the event of a failure, the dry transformer will be rejected entirely. The dry machine components, including copper (or aluminum) and the magnetic core, are nearly non-recyclable.
The company is the world’s best 35kV Oil-Immersed Power Transformer supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.