Varelen - Flameproof Transformer

• Transformer type: dry type
• Frequency: 50/ 60 hz
• Rated capacity: Up to 8000kVA
• Rated voltage: Up to 10kV
• Insulation class:  H  , C
• Cooling mode: ANAN
• Explosion-proof type: ExdIMb
• lightning impulse withstand voltage(Peak): 75kv, 60kv
• Connection code: Yd, Dyn, Yyn etc.
• Enclosure class: IP54  IP55
• Zone: Zone 1, Zone 2

For each transformer are prepared and issued a test report, in accordance with IEC 60079.  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

 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

 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