TYPES OF CAST RESIN TRANSFORMER TESTING

GNEE New Material cast resin type transformer

A cast resin transformer is a type of transformer that has outstanding features not use liquid to cool the coil but by air.

To make sure the quality and safety operation of the transformer, Users need to check and test them before operation and after operating for a long time. Tests help users easily detect some signs of damage.

 

Types of Cast Resin Transformer Testing

1. Routine Test

2. Type Test

3. Special Test

Routine Tests of Cast Resin Transformer

Auxiliary wiring insulation test

Dielectric routine tests

Voltage ratio Test

Transformer Ratio Test

Tests on-load tap changers

Winding resistance measurement

No-load loss and current measurement

Short-circuit impedance and load loss measurement

Phase displacement test

PD Measurement

Insulation test and functional verification of accessories

cast resin dry type transformer

Type Tests of Cast Resin Transformer

Temperature-rise type test (IEC 60076-2)

Dielectric-type tests (IEC 60076-3)

Sound level test (IEC 60076-10) for each method of cooling for which a guaranteed sound level is specified

No-load loss and current measurement at 90% and 110% of the rated voltage

Measurement of the power taken by the fan

Special Tests of Cast Resin Transformer

Dissipation factor measurement (tan δ) of the insulation system capacitances

Winding hot-spot temperature-rise measurements

Dielectric special tests (IEC 60076-3)

Determination of capacitances windings-to-earth and between windings

Short-circuit withstand test

Verification of the climatic classes

Detection of harmonic content in the no-load current

Determination of transient voltage transfer characteristics

Zero-sequence impedance(s) measurement on three-phase transformers

Frequency response Measurement (Frequency Response Analysis or FRA); the test procedure shall be agreed between manufacturer and purchaser

D.C. insulation resistance measurement between each winding to earth and between windings

Winding inductance measurement

Check of external coating (ISO 2178 and ISO 2409 or as specified)

Determination of weight with transformer arranged for transport for transformers up to 1,6 MVA by measurement; for larger transformers by measurement or calculation as agreed between manufacturer and purchaser

Thermographic detection of hot-spots

Verification of the behavior to fire classes

The transmitted vibrations measurement

In-rush surges test

Verification of the environmental classes

Test on vibration floor (seismic)

Recurrent voltage surges test

Low-temperature test