Mining transformers


Mining Oil immersed transformer

Easily adopt to the grid, easy connection process, saving energy
  • special oil immersed transformer
  • oil immersed pad mounted transformer
  • distribution transformer price
  1. special oil immersed transformer
  2. oil immersed pad mounted transformer
  3. distribution transformer price

Low noise solution

Efficient transformers with reduced losses

High frequency-low losses

Environmental friendly

Easily adopt to the grid, easy connection process


Customized design

Related product parameters

Main Specification
Primary Voltage1kv
Secondary Voltage415V
Winding materialCopper
Insulation levelH, C
Environment temperature-25~ +40

Factory Test

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 specialised tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.

 Routine Test

 a) Measurement of winding resistance

 b) Measurement of voltage ratio and check of phase displacement

 c) Measurement of short-circuit impedance and loss 

 d) Measurement of no-load loss and current

 e) Dielectric routine tests

 f) Tests on on-load tap-changers, where appropriate

 g) Leak testing with pressure for liquid-immersed transformers(tightness test)

 h) Tightness tests and pressure tests for tanks for gas-filled transformers

 i) Check of the ratio and polarity of built-in current transformers

 j) Check of core and frame insulation for liquid immersed transformers with core or frame insulation

 Type Test

 a) Temperature-rise type test

 b) Dielectric type tests

 c) Determination of sound level for each method of cooling for which a guaranteed sound level is specified

 d) Measurement of the power taken by the fan and liquid pump motors

 e) Measurement of no-load loss and current at 90% and 110% of rated voltage

 Special Test

 a) Dielectric special tests

 b) Winding hot-spot temperature-rise measurement

 c) Determination of capacitances windings-to-earth, and between windings

 d) Measurement of zero-sequence impedance(s) on three-phase transformers

 e) Determination of transient voltage transfer characteristics

 f) Short-circuit withstand test


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.

Related Content

Flame-proof transformers

Flame-proof transformers

GNAN transformers

GNAN transformers

Flame-proof mobile substation

Flame-proof mobile substation


Contact us

Varelen Electric Co., Ltd

Information submitted... Later, please