Dong Energy Thermal Power is planning to implement district heating production based on biofuels through erection of two wood-chip boilers, providing steam for existing steam turbine and/or stand alone district heating condenser. 2 boilers as an add-on the existing gas fired plant, Skærbækverket. The new biomass fired boilers shall deliver up to 320 MW heat to the district heating system. The new boiler plant shall have a c...
Dong Energy Thermal Power is planning to implement district heating production based on biofuels through erection of two wood-chip boilers, providing steam for existing steam turbine and/or stand alone district heating condenser. 2 boilers as an add-on the existing gas fired plant, Skærbækverket. The new biomass fired boilers shall deliver up to 320 MW heat to the district heating system. The new boiler plant shall have a capacity of maximum 280 MW and the remaining heat shall be provided by flue gas condensers.Transformers.It is DONG Energy Thermal Power's intention to enter into a contract for the engineering, delivery, transport, installation, commissioning and performance responsibility for transformers based on Functional Specifications. DONG Energy Thermal Power will elaborate technical and functional requirements to be included in the Tender material and also set up requirements for guarantees and performance.The plant shall be equipped with new transformers. The transformers will be feed from the new medium voltage distribution on site.The final design of the distribution is not set. Alternative solutions regarding the interface of the new medium voltage and main low voltage distribution are investigated.New transformers will be used for the add-on plant, destined users are new main low voltage distributions. Low voltage distribution transformers are to be of dry type and standard value of size, ratings chosen on basis of easy to obtain and changeable between bars at plant if needed.The following values are valid for the MV grid:— Rated Medium Voltage 3-phase, 50 Hz 12.0 kV;— Operating Medium Voltage 3-phase, 50 Hz 10.5 kV;— Nominal Medium Voltage 3-phase, 50 Hz 10.0 kV;— Standard lightning Impulse withstand voltage 75 kV peak;— Standard short-duration power-frequency withstand voltage 28 kV rms;— Short circuit current > 20 kA.The following values are valid for the main distribution of low voltage switchgear grid, with earthing system TN-S:— Operating Low Voltage 3-phase, 50 Hz, 690 VAC >2,5 MVA (3-4 pcs);— Operating Low Voltage 3-phase, 50 Hz, 400/230 VAC >2,0 MVA (3-4 pcs).Prospective short current levels for the new main distribution of low voltage switchgear are Ik > 50 kA.
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