Transportable power transformer unit

A transportable power transformer unit, comprising:

• at least one single-phase transformer configured for connection to a high-voltage grid, each single-phase transformer including:
• a tank to be filled with an insulating fluid for receiving a core with a high-voltage and low-voltage winding, said tank having a cover with an upper surface;
• at least one bushing socket to be connected by a winding connection line extending inside said tank to the high-voltage or low-voltage winding;
• at least one high-voltage bushing being inserted into said at least one bushing socket removably for transport;
• cooling equipment for cooling the insulating fluid;
• an expansion vessel for compensating for temperature-induced volume fluctuations of the insulating fluid;
• said expansion vessel and said cooling equipment being permanently mechanically fixedly connected to said tank;
• said expansion vessel extending on or over said upper surface of said cover of said tank and parallel to said tank, and said expansion vessel being spaced apart from said cover of said tank with a clearance of between 1 cm and 50 cm facilitating transport of the transportable power transformer unit;
• and
• a transport unit formed of said expansion vessel, said cooling equipment, said tank and each bushing socket, said transport unit having an external contour lying inside a predefined transport profile, and said tank, said cooling equipment and said expansion vessel being filled with insulating fluid during the transport.