Commissioning is the final and most important step before a power transformer enters service. It ensures the unit operates safely, reliably, and in compliance with international standards. Intertest provides complete commissioning services, combining electrical testing, functional verification, and expert assessment.

Scope of commissioning:

• Transformation ratio – confirmation of correct relation between primary and secondary windings.
• Winding resistance – verification of uniformity and detection of winding defects.
• Tap changer test – functional testing and verification of on-load/off-load tap changer performance.
• Vector group test – ensuring correct phase displacement and connection scheme.
• Short-circuit impedance – measurement of voltage drop and assessment of fault characteristics.
• Capacitance and power factor (tgδ) – analysis of insulation quality and detection of deterioration.
• Voltage withstand test – confirmation of insulation strength under elevated test voltages.
• Measurement of no-load loss – evaluation of transformer core performance and associated losses.

Your benefits:

• Safe and compliant commissioning in line with IEC and utility requirements.
• Early detection of defects before the transformer is energized.
• Reliable integration into the power system and extended service life.
• Documented results and expert recommendations from a certified team.

With Intertest Commissioning Services, you gain confidence that your power transformers are ready for flawless operation from day one.