Underground transformer station for high and medium voltage

A transformer station for high and medium voltages which is installed beneath the earth's surface, wherein at least one access point to the switchgear assembly and ventilation shafts are arranged above-ground, comprising:

• power transformers configured for converting high voltage into medium voltage;
• at least one medium-voltage switchgear assembly, and at least one auxiliary, secondary and protection and control devices;
• an access and transportation shaft which is configured for transporting operating means which are to be installed into the station, the access and transportation shaft including a moving closure element;
• and
• a base surface for holding the operating means and the transformers, the base surface being provided beneath the access and transportation shaft, wherein:
• the access and transportation shaft has a common transportation opening for transporting the transformers into the transformer station and is configured to be used as an exhaust-air shaft, the access and transportation shaft having ventilation ducts which ensure air guidance and constitute a physical termination of the shaft;
• the transformers, after being placed on the base surface, are configured to be moved into boxes for accommodating the transformers, the boxes being closeable;
• and
• coolers provided for the transformers are configured to be removed from the transformer tank and arranged outside the transformer boxes.