TESTING AND MEASUREMENTS OF TRANSFORMERS

Group II – oil-type transformers with a capacity greater than 2.5 MVA up to 100 MVA and a maximum rated voltage of up to 110 kV.
Group III – oil-filled transformers with a power rating up to 2.5 MVA.
Group IV – dry-type and composite Insulation transformers.

Post-installation testing conducted at the transformer installation site.

All transformers, regardless of their power ratings or nominal voltages , should undergo post-installation testing before being put into operation. The purpose of post-installation testing is to verify the transformer’s suitability for service and to check whether any changes or defects occurred during transport, storage, and installation at the site that might affect its reliability in operation.
Periodic testing of transformers.

The purpose of periodic inspections is to systematically (periodically) check the technical condition of transformers. Such inspections determine the suitability (or lack thereof) of transformers for continued operation. Observing results over time allows for assessing the degree and rate of transformer degradation..
Post-failure testing of transformers.
Acceptance testing of repaired transformers after overhaul or repair.

External inspection of the transformer.
Verification of the transformer’s equipment.
Measurements of the transformer’s gear and verification of the connection group.
Measurement of winding resistance.
Measurement of insulation resistance of the windings.
Measurement of magnetising currents.
Verification of the tap changer.
Measurement of the dynamic resistances of the on-load tap changer.
Measurement of the on-load tap changer switching times.
Measurement of winding capacitance and insulation loss factor (tgδ).
Testing the mechanical condition of windings using the Sweep Frequency Response Analysis (SFRA) method.
Measurement of insulation moisture content using the FDS (Frequency Domain Spectroscopy) method.

Testing of oil properties.
Verification of the Buchholz relay operation.
Verification of control panel operation, cooling system, tap changer drive, oil flow indicators, valves, and thermostats.
Verification of the transformer venting, coolers, pumps, bushings, conservator, tap changer, current transformers, etc.
Checking the silica gel in the dehumidifier.
Verification of the electric shock protection of control cabinets.
Thermal imaging inspection of transformers.
Study of transformer vat vibrations (vibroacoustic analysis of the transformer).
Measurement of the active power consumption of the on-load tap changer motor.
And others.

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