Three-terminal DC engineering DC field

The utility model relates to a three-terminal direct-current engineering direct-current field which comprises a bus collection station and is characterized by further comprising direct-current high-speed parallel switches which are respectively arranged on two-pole buses of the bus collection station. A direct-current high-speed parallel switch is arranged on a wire used for being electrically connected with a positive electrode wire and a negative electrode wire of a direct-current converter station of the bus collection station. The four sets of direct current polarity conversion switches are arranged in a bridge mode to form a polarity conversion loop, and the polarity conversion loop is arranged in a flexible wire cross-line mode. The polarity conversion loop and double-loop polar lineoutgoing equipment of the bus collection station are arranged in parallel, and the double-loop polar line outgoing equipment is arranged in a straight line. The utility model aims to provide a conventional three-terminal dir