Varelen Electric Co., Ltd

Power Transformer

  • ♦Varelen design power transformer can customized voltage up to 132KV                 
  • ♦High short circuit withstand capability
  • ♦Low loss and saving cost
  • ♦Customized transformers are available


Power Transformer

Related product parameters

Main Specification
Transformer Type oil immersed
Rated capacity up to 25mva
Rated voltage up to 132kv
Frequency 50/60Hz
Phase 3 Phase
Winding material Copper /Aluminum
Insulation class A
Vector group YNd1d1,dyn11
Dieletric liquid Mineral oil / Dimethyl Silicone/ Vegetable Oil
Tap changer Off-load or on-load


Pressure Relief Device

Tap changer

Oil temperature Indicator

Bucholz relay



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

  • 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
  • Determination of sound level for each method of cooling for which a guaranteed sound level is specified
  • Measurement of the power taken by the fan and liquid pump motors
  • Measurement of no-load loss and current at 90% and 110% of rated voltage

Special test

  • Partial discharge measurement
  • Measurement of sound level
  • Short-circuit withstand test
  • Determination of capacitances windings-to-earth, and between windings
  • Vacuum deflection test on liquid immersed transformers
  • Pressure deflection test on liquid immersed transformers

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