Products & Service


Production Add: Jinzhou South Road,

Ningxiang Industrial Park, Changsha,

Hunan Province, China 


Tel:+86 731 84351029

Fax:+86 731 84371029

Mobil: +86 13873121822

Your present location:index >> Products & service >> Dry Type Transformer >> Epoxy cast resin dry-type power transformers
  • Product: Epoxy cast resin dry-type power transformers
  • Rated capacity: 30~31500kVA
  • Frequency: 50/60Hz
  • Primary voltage: 5~35kV
  • Secondary voltage: 0.38~10kV



Transformers/reactors/intelligent integrated substations-Smart Energy for Better Life



Dry type transformer is suitable for power transmission and distribution system, hotel, restaurant, hospitals, shopping malls, bank buildings ,stadiums, airports, stations especially heavy load centers and places with special fire protection requirements. Dry type transformer is the best choice for specific markets where safety or ecology are main concerns.



1. One of the drafters of the National Standard Mine Flameproof Mobile Substations (GB/T 8286-xxxx ), which will replace the existing national standard (GB/T 8286-2005 ) and it was submitted for trial in Beijing.

2. +20 years experience R&D team, derived from a 60 years of history transformer manufacturer in Changsha, Hunan, China since 1956.

3. Full range of transformer types with customized functions are available.

4. CE & ISO certificated.


Below are the tests conducted by Varelen before delivery. Other tests required by clients can also be done accordingly.

Insulation resistance

Resistance of all windings

Check voltage ratio and vector group

No-load test at rated frequency and rated voltage

Impedance test

Withstand voltage test

Induced over-voltage withstand test

Partial discharge measurement


Product Features:

1. 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. 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.



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. 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.


5. Tap changer is available to adapt respective network conditions.


Main specifications:

Dry-type transformer type

Cast resin

Manufacturing standards

IEC, ANSI, NFC52 etc

Rated capacity

up to 25MVA

Rated Voltage

Up to 36KV


single or three phase


With tapping links or on-load tap changer


On request


50Hz or 60Hz

Vector groups

Dy, Yy, Yd as standard. Other on request

class insulation

According to IEC 60085, Class F or Class H

Temperature rise

With ambient temperature in accordance with IEC 60076-11

Type of cooling


IP rate

IP00 to IP54

Environment class


Climate class


Fireproof class