Oil immersed transformer

Dry type transformerOil immersed transformerMining flame proof substationPhase-shift Rectifier transformerSpecial transformerIntegrated substationReactor

Hermetically sealed 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

    Whether in design, manufacturing methods or materials the cores of Huarui transformers represent the latest state of technology. The silicon alloyed electric sheet steel used is grain-oriented, cold-rolled and insulated on both sides, guaranteeing low losses and noise and these values are even improved by laser treatment. Numerically controlled cutting machines provide for careful treatment in the cutting process in order to avoid mechanical tension in the core and thus unwanted properties right from the beginning. Standard use of step-lap cutting additionally minimizes losses and noise.

  • The Tank

    The Tank

     The Tank Whether during transport or operation –the tank must be absolutely  fully sealed structure under mechanical stress. Preconditions to achieve this are constructional experience, the most modern calculation methods and high-quality welding work. Special attention is paid to corrosion protection. Pretreatment of the surface is processed by phosphating pickling, contributes to corrosion protection, just like multi-coating with preset drying times for each layer. On request, hot-dip galvanization provides for even better protection.  

  • winding


    The winding as the centerpiece of the transformer must be especially protected – both against high electrical stress due to external over voltages and against mechanical overloads by short circuits. Huarui transformers are systematically designed to meet these requirements. The windings are made of copper or aluminum. Low-voltage windings are made of strip or flat wire, and the high voltage windings are manufactured from round or profile wire. (“diamond-dotted paper”) bonds the winding into a compact block while drying and increases the short-circuit capacity additionally.

  • insulation bushing

    insulation bushing

    procelain busing

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
Dielectric liquid
Mineral oil / Dimethyl Silicone/ Vegetable Oil
Impedance4% to 8%
 Lossesaccording to customers requirements
Vector groupsDyn11, Yyn11 (according to customers requiements)

Factory Advantages

  • Personalized customization

    Only Focused on transformers, but we offer customized different types of transformers.

  • +20 years experience

    +20 years experience R&D team, derived from a 60 years history transformer factory in Changsha city of China.

  • Drew up the National Standard for Mining Explosion-proof Substation

    GB8286 (Mining explosion-proof Mobile Substations)the product of National standard that origin and inheritor,Unique designing for customers' convenience,like “Vertically Lifting”


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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Varelen Electric Co., Ltd

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