TESTING AND MEASUREMENTS OF TRANSFORMERS
We conduct technical inspections of power 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.
Types of technical tests performed on transformers by OPA S.A.:
Depending on the type of technical inspection and the group to which a given transformer belongs, the scope of measurements and tests of transformers may vary. We can distinguish the following measurements and tests of transformers, which we perform in our company:
- 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.
GALLERY
