District heating transformers in Sweden

Delivery of no.2 4000 kVA cast resin transformers 21.5-0.725 kV to Norrenergi, Sundbybergsverket in Sweden.
The transformers feed a newly built pumping system for district heating with only a controlled frequency load.
The transformers are sized for a harmonic content required by the IEC 61378/1 standard, "transformers for industrial use" with a THDi of about 30%.