Network transformers

Hitachi Energy has completed the development of the dry-type transformer intended for network applications, even submersible. The unit is inside a completely sealed tank, and both tank and active assembly have been designed and tested to the IEEE C57.12.40 standard for network transformers (amended for dry-type features). The absence of oil eliminates the threat to the surrounding environment during an internal failure. 

The main features of dry-type submersible network transformer are the complete absence of oil, entirely welded tank assembly, N2 gas overpressure for tank deterioration monitoring, 2-position ground switch, 70 percent overloading capability, similar footprint to liquid-filled units with cooling fans and power rating up to 1,000 kVA and 15 kV primary voltages.

• Up to 1 MVA
• High voltage up to 15 kV
• Classes E2, E3, C2, F1
• Frequencies: 50 Hz, 60 Hz and 16 2/3 Hz
• Cooling: AN
• Insulation system temperature: F and H
• Partial discharges <10 pC

• Respectful with people and property
• Suitable for being installed in the cities with high density (underground)
• Unique Hitachi Energy solution