Varelen Electric Co., Ltd

Cast Resin Transformer

  • Non-flammable and self-extinguishing.
  • Insulated with an epoxy resin - environmentally friendly.
  • Reinforce insulation, improve the heat dissipation of transformer.
  • Moisture proof, dust proof, flame resistance and lightning shock resistance.
  • Maintenance free, more reliable



Cast Resin Transformer
cast resin transformers
epoxy cast resin transformer
cast resin coils
cast resin dry transformer

Related product parameters

Why choose Varelen dry type transformer? Safe and environmental friendly transformers

  • ♦reduce environment pollution
  • ♦zero risk of flammable or polluting material leaks
  • ♦Environmentally-friendly production

  • ♦Non-flammable and self-extinguishing
  • ♦Strong short-circuit resistance
  • ♦High overload capacity
  • ♦dry type transformers can be designed, customized, and supplied with a wide variety of accessories , according to customer requirements.

  • ♦ long life 25 years


Varelen dry type transformer is suitable for power transmission and distribution system, hotel, restaurant, hospitals, shopping malls, bank buildings , stadiums, wind , solar , airports, railway, stations especially heavy load centers and places with special fire protection requirements.


Varelen technology: What makes us different?

Varelen electric used most advanced production technology and the most control systems to guarantee the highest transformer products quality and total product reliabliity.

1. Magnetic core: The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel laminations insulated on both sides, guaranteeing low losses and low noise.

2. Clamping frame:  it is processed by CNC cutting, bending and then one-time punch forming, the hole’s size is accurate and the appearance looks delicate.

3. HV and LV winding: The winding coil is made of oxygen-free copper, class H for main insulation materials and coil is insulated by NOMEX paper of DUPONT brand, LV winding is isolated by copper foils. All these make the heat-resistant is up to 220℃, with excellent overload capacity and low loss, but high efficiency.

4. Varelen practices strictly exclusive casting system of F(155℃) or H(180℃), and the epoxy resin is injected and casted in the vacuum machine, so it’s highly insulated, dust-proof and moisture-proof, which ensures stable and reliable performance.



Main Specification
Transformer Type cast resin
Rated capacity up to 25mva
Rated voltage up to 36kv
Frequency 50/60Hz
Phase 3 Phase
Winding material Copper /Aluminum
Insulation class F, H, C
Vector group YNd1d1, Dyn11, Dyn5
Cooling AN
Protection Enclosure IP00 to IP54
Temperature Class E2 C2 F1



Tap changer

Temperature monitoring

Antivibration pads




For each transformer are prepared and issued a test report, in accordance with IEC 60076. except for routine tests, we also offer type tests and specialized tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.


Routine test

  • Measurement of winding resistance
  • Measurement of voltage ratio and check of phase displacement
  • Measurement of short-circuit impedance and load loss
  • Measurement of no-load loss and current
  • Separate-source AC withstand voltage test
  • Induced AC withstand voltage test
  • Partial discharge measurement

Type test

  • Lightning impulse test
  • Temperature-rise test

Special test

  • Partial discharge measurement
  • Measurement of sound level
  • Short-circuit test

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