Basic Knowledge of Transformer Transportation

Transporting transformers involves specific considerations depending on their size and configuration.

Transformers Below 80 Tons

• Recommendation: Transport with oil. Fill the space above the oil level with dry air to prevent moisture.

• Conduct comparative tests before transportation, including insulation resistance, oil condition tests (water content, electrical strength if possible), and pressure gauge readings.

Transformers 80 Tons and Above

• Recommendation: Do not transport with transformer oil. Fill the transformer body with dry gas (air or nitrogen) to maintain dryness.

• Maintain the oil tank at a positive pressure of 0.01~0.03 MPa during transportation.

Monitoring and Testing

• For transformers transported with dry gas:

  1. Monitor vacuum/pressure and temperature regularly during transportation to detect any leaks that could compromise coil and insulation safety.

  2. Record and compare pressure and temperature values with factory specifications.

  3. Perform a dew point test if there are discrepancies in pressure/temperature relationships.

Shipping Procedures

• Transformers shipped without oil should have all parts dismantled and be equipped with a shock recorder.

• Ensure the transformer's sealing performance remains intact throughout transportation and storage.

• Regularly monitor gas pressure, following instructions and record sheets attached to the shipping manual.

Pressure Gauge and Filling Valve

• Install under a protective cover (side or top of the transformer) for monitoring. Use a transparent or stainless steel cover that seals after each inspection.

• Pressure gauge range: 0-60 kPa. Inflator outlet connected to a hose with 5-8 mm internal thread diameter.

Pressure Limits and Monitoring During Storage

• Factory pressure at 20°C is 20 kPa, adjusting with ambient temperature changes (positive pressure maintained even at -25°C).

• Check pressure regularly; report complete pressure loss immediately as it indicates a leak or moisture ingress.

• Maintain pressure above 20 kPa in colder climates, ensuring dry air dew point is below -40°C before filling.

In conclusion, adhering to these guidelines ensures the safe and effective transportation of transformers, preserving their integrity and performance during handling and storage.