Earthing transformers

An earthing transformer is usually associated with three-phase supply systems.

The neutral would be earthed directly or through some limiting impedance/resistance on a three-phase system. When the neutral point is unavailable or does not exist with a delta secondary winding of the transformer, a neutral point needs to be created. This is the purpose of the earthing transformer, which could consist of a zig-zag winding or a two-winding star delta transformer where the star winding of correct voltage supplies an accessible neutral point when connected to the supply system.

• Up to 2 MVA
• High voltage up to 36 kV
• Low voltage up to 0.69 kV
• Classes E2, E3, C2, F1
• Frequencies: 50 Hz, 60 Hz and 16 2/3 Hz
• Cooling: AN / ANAN / ANAF
• Insulation system temperature: F and H
• Partial discharges <10 pC
• Protection degree: IP00 - IP54

• Respectful with people and property
• Powerful engineering and Hitachi Energy design
• Customized solutions for all customers