Varelen Electric Co., Ltd

Pad mounted transformer

Liquid-filled three phase pad-mounted transformers are an excellent choice for any
commercial or industrial underground distribution system.

Provide safe, reliable power output in public space.

  • Sealed tank construction
  • FR3 high-fire-point dielectric fluid, environmental friendly choice
Pad mounted transformer

Related product parameters

Main Specification
Transformer Type oil immersed
Rated capacity up to 20000kva
Rated voltage up to 36kv
Frequency 50/60Hz
Phase 3 Phase
HV Bushing Dead front or loop feed designs
LV Bushing Epoxy or procelain bushing
Winding material Copper /Aluminum
Insulation class F, H
Oil Mineral oil , FR3, MIDEL 7131
Vector group Dyn11, Dyn5
Cooling ONAN/ ONAF
Tap changer yes
Application apartment buildings, schools, hospitals, shopping centers, and  industrial sites.

pad mounted transforme details


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 loss
  •  Measurement of no-load loss and current
  • Dielectric routine tests
  • Tests on on-load tap-changers, where appropriate
  • Leak testing with pressure for liquid-immersed transformers(tightness test)
  • Tightness tests and pressure tests for tanks for gas-filled transformers
  • Check of the ratio and polarity of built-in current transformers
  • Check of core and frame insulation for liquid immersed transformers with core or frame insulation

Type test

  • Temperature-rise type test
  •  Dielectric type tests
  • 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

  • Dielectric special tests
  • Winding hot-spot temperature-rise measurement
  •  Determination of capacitances windings-to-earth, and between windings
  • Measurement of dissipation factor(tanδ) of the insulation system capacitances
  •  Determination of transient voltage transfer characteristics
  •  Measurement of zero-sequence impedance(s) on three-phase transformers
  • Short-circuit withstand test
  • Measurement of d.c. insulation resistance each winding to earth and between windings
  • Vacuum deflection test on liquid immersed transformers
  • Pressure deflection test on liquid immersed transformers
  • Vacuum tightness test on site on liquid immersed transformers

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