Distribution transformers and Shunt reactors with Petersen coil functionality

Caruna is looking for the reliable and cost efficient supplier(s) for oil-immersed distribution three-phase transformers 1-24 kV 50 Hz and oil-immersed three-phase shunt reactors with Petersen coil functionality 24 kV 50 Hz to be used in Caruna's electricity network in Finland. Caruna is now starting the tendering process by selecting tenderers to the negotiation process. In this tendering, distribution transformers and shunt reactors with Petersen coil functionality are grouped in the following purchase groups: Group 1: Distribution transformers Group 2: Shunt reactors with Petersen coil functionality More detailed description of the above equipments will be shared with selected tenderers during the negotiation round., Group 1: Distribution transformers Group 1: Distribution transformers. Distribution transformers from 50 kVA to 1000 kVA intended for operation in three-phase distribution networks, for indoor or outdoor or poles continuous service, 50 Hz, immersed in oil, natural cooling and hermetically sealed without conservator, with two windings: - a primary (high-voltage) winding with a highest voltage for equipment Um not exceeding 24 kV. - a secondary (low-voltage) winding with a highest voltage for equipment Um not exceeding 1,1 kV. The ambient temperature range of the equipment shall be from –40 °C to +40 °C. Technical lifetime of transformers shall be longer than 40 years. Rough estimated volume per year: 2026: 250 pcs 2027: 550 pcs 2028: 770 pcs 2029: 980 pcs 2030: 1100 pcs Rough estimated split of total volume per transformer size: 50 kVA (43 %) 100 kVA (26 %) 200 kVA (11 %) 315 kVA (5 %) 500 kVA (4 %) 800 kVA (5 %) 1000 kVA (6 %) No volume commitment is given from Caruna side. Detail technical specifications about the transformers will be shared with selected tenderers during the negotiation round., Group 2: Shunt reactors with Petersen coil functionality Shunt reactors with Petersen coil functionality intended for operation in three-phase distribution networks, for indoor or outdoor, continuous service, 50 Hz, immersed in oil, natural cooling and hermetically sealed, without conservator. The ambient temperature range of the equipment shall be from –40 °C to +40 °C. Technical lifetime of reactors shall be longer than 40 years. Estimated volume per year: 2026: 20 pcs 2027: 60 pcs 2028: 90 pcs 2029: 120 pcs 2030: 140 pcs No volume commitment is given from Caruna side. Detail technical specifications about the shunt reactors will be shared with selected tenderers during the negotiation round.,