Varelen - Special Transformer

• Transformer Type: oil immersed
• Rated capacity: up to 20mva
• Rated voltage: up to 132kv
• Frequency: 50/60Hz
• Phase: 3 Phase
• Winding material: Copper /Aluminum
• Insulation class: A
• Vector group: YNd1d1
• Cooling: ONAN, KNAN
• Dieletric liquid: Mineral oil / Dimethyl Silicone/ Vegetable Oil
• Tap changer: Off-load or on-load
• Accessories:
• Conservator
• 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
• c) 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