Oil immersed transformers


Medium voltage transformers

Largely reduce non-load losses by adopting amorphous or high quality silicon steel core, LV winding has stronger resistance to short circuit, Low noise solution
  • oil immersed transformer 3200kva
  • distribution transformer 3mva
  • 3150kva transformer
  • 3mva transformer
  1. oil immersed transformer 3200kva
  2. distribution transformer 3mva
  3. 3150kva transformer
  4. 3mva transformer

Low noise solution

Efficient transformers with reduced losses

High frequency-low losses

Environmental friendly

Manintance free


Customized design

Our product advantages

  • Iron core

    Iron core

    The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel lamination insulated on both sides, guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.

  • The Tank

    The Tank

    The transformer is fully sealed, which ensures the stability of oil quality, extends the service life,  maintenance. At the same time, the tank composed of corrugated radiator adopts phosphating and multi-layer anti-rust spraying technology to produce, which has good weather resistance.


  • winding


    The windings are made of oxygen-free copper , so the load loss of is lower and the electric performance is better.

  • insulation bushing

    insulation bushing

     Insulated ceramic bushing, excellent insulation capability, effective in preventing breakdown

Related product parameters

Main Specifications
Transformer typeOil-immered type
PhasesThres phases or single phases
Capacity30 - 31500kva (customization is available)
Voltageup to 36kv
Oil preservationHermetically Sealed/ Conservator/ Free Breathing
Tap changeroff-load or on-load
Winding material Aluminum/ copper
Coolerscorrugated wall or radiator
Cooling modeONAN /ONAF/KNAN
Dielectric liquid
Mineral oil / Dimethyl Silicone/ Vegetable Oil
Impedance4% to 8%
 Lossesaccording to customers requirements
Vector groupsDyn11, Yyn11 (according to customers requiements)


Varelen offers a complete range of power and distribution transformers designed to grant the reliability, durability, and efficiency required in utility, industrial,and commercial applications. Our oil-immersed transformers are manufactured in accordance with the most demanding industry and international standards. Transformers can be used for indoor or outdoor applications and can be provided with off-load and on-load tap changers.
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Contact us

Varelen Electric Co., Ltd

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