Switzerland – Installation services of transformers – 6 piece regulating transformers 40MVA ONAN (50MVA ONAF) 110//10/20kV

The supply, installation and commissioning of six on-load tap-changer (OLTC) transformers, 110kV OS, 10kV/20kV US, with an apparent power of 40MVA ONAN, or 50MVA ONAF. Both OS and US windings are permanently rated at 50MVA. Operation without forced cooling is envisaged up to 40MVA, and above 40MVA, the OLTC transformer must automatically switch on the forced cooling. Purpose of the OLTC transformer, with regulating winding. Operating mode: continuous operation. Type: power transformer with primary-side on-load tap-changer. Low voltage switchable from 10kV to 20kV. Design: oil transformer with air bushings on both US and OS sides for outdoor installation or indoor installation and road-transportable design for delivery. Expected lifetime 60 years.