Device for switching a direct current in a pole of a DC voltage network

A device for switching a direct current in a pole of a direct current network, the device comprising:

• two connection terminals for connection in series to the pole;
• an operating current path extending between said connection terminals, said operating current path having at least one mechanical switch;
• a disconnection branch configured to bypass said operating current path, said disconnection branch having a power switching unit for disconnecting high fault currents, said power switching unit having a power semiconductor switch configured to be switched on and off;
• a commutation device for commutating a current from said operating current path onto said disconnection branch, said commutation device having at least one inductive component part;
• junctions each disposed between said operating current path and said disconnection branch;
• inductive component parts each disposed between a respective one of said connection terminals and a respective one of said junctions;
• and
• further inductive component parts each disposed in said operating current path or in said disconnection branch and each inductively coupled to a respective one of said inductive component parts.

A device for switching a direct current in a pole of a direct current network, the device comprising:

• two connection terminals for connection in series to the pole;
• an operating current path extending between said connection terminals, said operating current path having at least one mechanical switch;
• a disconnection branch configured to bypass said operating current path, said disconnection branch having a power switching unit for disconnecting high fault currents, said power switching unit having a power semiconductor switch configured to be switched on and off;
• a commutation device for commutating a current from said operating current path onto said disconnection branch, said commutation device having at least one inductive component part;
• a junction between said operating current path and said disconnection branch;
• an inductive component part disposed between a connection terminal and said junction;
• and
• a further inductive component part disposed in said operating current path or in said disconnection branch and inductively coupled to said inductive component part;
• said inductive component parts being inductively coupled to one another have windings with mutually opposite winding directions.

A device for switching a direct current in a pole of a direct current network, the device comprising:

• two connection terminals for connection in series to the pole;
• an operating current path extending between said connection terminals, said operating current path having at least one mechanical switch;
• a disconnection branch having a power switching unit for disconnecting high fault currents, said power switching unit having a power semiconductor switch configured to be switched on and off;
• said power switching unit having a series circuit including two-pole sub modules having at least one said power semiconductor switch configured to be switched on and off and a device for decaying energy released during switching;
• and
• a commutation device for commutating a current from said operating current path onto said disconnection branch, said commutation device having at least one inductive component part;
• each of said sub modules having two connection terminals, an energy storage device and a power semiconductor circuit connected in parallel with said energy storage device, permitting either a voltage drop across said energy storage device or a zero voltage to be generated at said two connection terminals of each of said sub modules.