Transformer Testing

• Measurement of winding resistance.
• Measurement of voltage ratio and Check of phase displacement/voltage vector relationship.
• Measurement of short-circuit impedance and Load loss at 50% and 100% load.
• Measurement of no-load loss and current.
• Measurement of insulation resistance.
• Separate source ac withstands voltage test.
• Induced ac voltage test.
• Temperature-rise test (oil-cooled transformer).
• Measurement of zero sequence impedance(s) on three-phase transformers.
• Measurement of neutral current.
• Pressure test (Routine).
• Pressure test (Type).
• Temperature-rise test (dry type transformer).
• Measurement of harmonics of no-load current.
• Magnetic balance test on 3-phase transformer.
• Permissible flux density and over fluxing.
• Oil leakage test.
• Measurement of no-load current at 112.5% voltage.
• Determination of sound level.
• Paint adhesion tests.
• Measurement of moisture content of oil & oil BDV test.
• Impulse test.