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Power Transformer - China

price: 11.00 Dollar US$

Power Transformer: Dry Type & Oil Filled Transformer

Power transformer, a kind of device, utilizes the principle of electromagnetic induction to change alternating voltage. It is mainly composed of coil and iron core (magnetic core). And the coil has two or more than two windings: primary coil and secondary coil. Primary coil is connected with the power source, and the rest is called the secondary coil. And the main functions of power transformer are voltage transformation, current transformation, impedance transformation, isolation, voltage regulation, etc. According to the cooling method, power transformer can be divided into dry type transformer and oil immersed transformer.

An oil-immersed power transformer is on the ground.
Oil-immersed power transformer.A dry type power transformer is on the ground.
Dry type power transformer.
Comparison between dry type transformer and oil immersed transformer

Differences in processing technology
Dry type transformer depends on the nature air cooling or fan for cooling, while oil immersed transformer relies on the insulation oil as the cooling medium. The iron core and winding of dry type transformer are commonly casted by epoxy resin while the iron core and winding of oil immersed transformer are immersed in the tank filled with transformer oil.
Differences in capacity and voltage
Dry type transformer is commonly used for distribution with capacity less than 1600 kVA and voltage less than 10 kV. While oil immersed transformer can be used for all capacity and voltage. Dry type transformer should work in rated capacity, while oil immersed transformer has better overloading capacity.
Differences in applicable places
Dry type transformers mostly are applied for places where need fireproof and explosion-proof, such as the large buildings and high-rise buildings. Oil immersed transformer, after the accident, may have oil spray or oil leakage which would result fire. Thus, oil immersed transformers are usually used in separate rooms or outdoors with accident oil tank.
Differences in cost
When making power transformer with the same capacity and voltage, the process of making dry type transformer is relatively complex than oil immersed transformer, thus, the cost is also relatively high.
You can contact us via sales at electricpowerdistribution dot com, if you have any questions about our products.


Company Contact:


  • Phone: 8631857810511

  • Address: West Industry Park, Hengshui, Hebei, China., Henghui, Hebei, China

  • Email: Email


Published date: August 15, 2016 -

  • Business Description: Hebei Keneng Electric Co., Ltd. is the professional manufacturer of power distribution systems in China. We not only manufacture electric equipment, such as switchgears, power transformers, prefabricated substations, circuit breakers and other electrical components, but we can also design electric systems for customers according to their requirements. We have been focusing on research and development in recent years, and we have made great achievement in this industry. We have established long term cooperation relationship with many companies. Our products have been exported to many countries, such as Spain, Mexico, the Philippines, India and Germany, and our products have been used in many projects successfully.

    Electric equipment is widely used in various areas, such as residential areas, power plants, transformer substations, airports, railway stations, subways, ports, supermarkets, shopping centers, hospitals. And they are also used for many industries, such as paper-making, cement, textile, chemical engineering, food, automobile, metallurgy and mine.

    Several switchgears are in the workshop.
    Switchgears are mainly used for power generation, transmission, distribution and conversion in electric power systems.A power transformer is in the workshop.
    Power transformers can change alternating voltage by taking advantage of electromagnetic induction.
    A prefabricated substation is in the workshop.
    Prefabricated substations are widely used for residential areas, commercial hotels, large construction sites and high-rise buildings.
    We provide our customers with high quality & safe electric equipment and considerate service. We have large workshop, advanced equipment and skilled workers to guarantee the products quality. And we attach importance to raw material selection. Besides, we have testing rooms and complete testing equipment to test our products before they are delivered to our customers. And we have experienced engineers to design power systems according to your requirements.

    Contact us immediately if you are interested in our products or our service. You can email us at sales@electricpowerdistribution.com if you have any questions.

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