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 OS 110kV, US switchable 10kV to 20kV, with an apparent power of 40MVA ONAN, or 50MVA ONAF. The OS and US windings are permanently rated at 50MVA. Operation without forced ventilation is planned up to 40MVA, and above 40MVA the OLTC transformer must automatically engage forced ventilation. Purpose of the OLTC transformer, with equalising winding Operating mode Continuous duty Type Power transformer with primary-side tap-changer, with low voltage switchable from 10kV to 20kV Design Oil transformer with air bushings on the US and OS sides for outdoor installation or twice for indoor installation and road-transportable design for delivery. Expected lifespan 60 years.