Factory Tests
• Test : Tests performed in the test laboratory:
Routine Experiments
• Measurement of winding resistance
• Measurement of voltage conversion ratio and control of voltage vector phase shift
• Measurement of short-circuit impedance and loss in load
• Measurement of no-load loss and current
• Dielectric routine experiments
• Insulation resistance
Type Tests
• Temperature rise test
Special Experiments
• Measurement of zero sequence impedance in three-phase transformers
• Measurement of no-load current harmonics
Tests performed in non-factory test laboratories:
Type Tests
• Lightning impact test
• Short Circuit mechanical strength test
Special Experiments
• Determination of the capacitance between the windings, the ground and the windings,
• Measurement of zero sequence impedance in three-phase transformers
• Short circuit withstand test
• Measuring sound levels
• Measurement of no-load current harmonics
• Measuring the insulation resistance of the windings to earth and/or measuring the loss factor (loss angle tangent) (tgδ) of the insulation system capacitances.