Project description Substation Berliner Straße The structure is built on a 2,095 m2 plot and is divided as follows: In the basement, the cables are introduced into the building. These are then transferred directly to the 20 kV switchgear on the ground floor and via an open shaft to the 110 kV switchgear on the first floor. Upper floor led. The two 110 kV transformers provided are located on the ground floor, while the oil pans for these transformers are located on the 1st floor. Basement level. The building has a staircase in the southern area, which allows access from the basement to the roof. In addition, a freight elevator is installed, which extends to the 1. Upstairs is enough. The structure extends over a depth of about 22.5 m and a width of about 48.8 m. On the southwest side, an approximately 2 m wide shaft is provided, which serves the forced cooling of the two 50/63 MVA transformers. The total building height is about 15.3 m including an attic of 1.4 m. The civil engineering includes a well foundation for the foundation as well as the construction of a Berlin Verbaus with rear anchorage to secure the excavation. Furthermore, the building must be provided with a predefined expanded metal facade with a corresponding substructure. The 110 kV switchgear in the 1. The upper floor is to be designed as a gas-insulated double busbar variant with an alternative gas to SF6 that meets the current requirements of the F-Gas Regulation. This switchgear comprises seven fields with the following division: Substation 1, feed-in network 1, longitudinal separation, cross coupling, feed-in network 2, substation 2 and reserve field. The busbars and fields shall be designed to 2500 A and a short-circuit current of 40 kA for 3 seconds. The standardized protective and control cabinets are housed in a separate adjoining room. A supplied 110 kV E-coil is available in the 1. To be installed on the upper floor and connected to the 110 kV points of the transformers. The separators to be supplied are located in the e-coil room. All necessary connections must be taken into account in the scope of the project. On the ground floor are the 20 kV primary switchgear and the star point switchgear. The primary switchgear shall be implemented as an air-insulated double busbar, with a rated current of 2500 A and a short-circuit current of 25 kA for 3 seconds. It comprises 42 fields, two of which must be reserved. The switchgear is divided into three busbar sections, which are connected to each other via two longitudinal couplings. Sections 1 and 3 also contain cross couplings. The star point switchgear is to be designed as an air-insulated single busbar, comprises 11 fields and can be connected to each other via three longitudinal couplings. It shall be designed for a rated current of 1250 A and a short-circuit current of 20 kA for 1 second. Two supplied 20 kV E-coils, as well as a supplied earthing transformer and the 20 kV star points of the supplied transformers must be connected to this system. All necessary connections must be taken into account in the scope of the project. In the first Basement is the AC and DC switchgear as well as the batteries for the DC supply. The DC switchgear is redundant and includes two batteries with 200 Ah each at 220 VDC. The AC switchgear comprises six fields, including a feed-in field for the 400 kVA self-consumption winding of the earthing transformer, a feed-in field for a 400 A house connection, and one for the mains replacement system. In addition, three fans are installed in each basement for ONAF operation of the 110 kV transformer rooms. All technical components must be manufactured in accordance with current standards and regulations. Execution of electrical equipment ? 110 kV switchgear in SF6-free design incl. control cabinets (7 fields with space reserve for another) ? Two 110/20 kV transformers with an output of 50/63 MVA (supplied) ? 20 kV primary switchgear // DSS system air-insulated (42 fields) ? 20 kV point switchgear // ESS system air-insulated (11 fields) ? Two 20 kV electric coils up to 52-520 A in continuous operation, 650 A in short-term operation (supplied) ? One piece 110 kV E-coil up to 24-240 in short-term operation (will be provided) ? A piece of grounding transformer with a stellar point current of up to 565 A in continuous operation; 660 A in short-term operation and a net power of 400 kVA (will be provided) ? Self-consumption system AC and DC ? 220 VDC battery system Division of the rooms in the substation ? Basement o 2 pieces transformer trays o stairwell (1x for sw net) o anteroom (1x for sw net) o goods lift (1x for sw net) o technical room o self-consumption system room AC o self-consumption system room DC o battery room o tank room o cable basement (20 and 110 kV cables) o cable ducts (2x 110 kV, 2x fiber optics, 1x TGA, etc.) ? Ground floor o 2 pieces transformer rooms o staircase (1x for sw net) o anteroom (1x for sw net) o freight elevator (1x for sw net) o BMA/EMA room o hallway o 2 pieces 20 kV electric coil rooms o 1 piece earthing transformer room o 20 kV DSS primary and star point switch room o sanitary rooms o 20 kV technical room o cable shafts (2x 110 kV, 2x fiber optic, 1x TGA, etc.) ? First upper floor o 2 pieces of air spaces for the transformers o staircase (1x for sw net) o vestibule (1x for sw net) o freight elevator (1x for sw net) o hallway o 110-kV protection and control technology o 1 piece 110-kV E-coil room o 110-kV switchgear room o 110-kV technical room o network replacement system room o cable ducts (2x FO, 1x TGA, etc.)
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