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

Patent metadata

Field	Value
Publication number	US-9831657-B2
Application number	US-201214653983-A
Country	US
Kind code	B2
Filing date	Dec 19, 2012
Priority date	Dec 19, 2012
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A device for switching a direct current in a pole of a direct current network includes two connecting terminals to be connected in series with the pole, an operating current path extending between the connecting terminals, at least one mechanical switch in the operating current path, a disconnection branch including a power switching unit for shutting down high short-circuit currents having power semiconductor switches that can be switched on and off, and a commutation device for commutating a current from the operating current path to the disconnection branch. In order to provide such a device which is economical, generates fewer losses and at the same time is able to switch high short-circuit currents quickly, the commutation device is provided with at least one inductive component.

First claim

The invention claimed is:

1. 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 two mechanical switches and a central branch potential point disposed between said two mechanical switches;
a shunt current branch extending in a circuit being parallel to said operating current path between said connection terminals, said shunt current branch including at least one of said two mechanical switches or two power semiconductors and said shunt current branch having a central branch potential point disposed between said at least one of two mechanical switches or two power semiconductors;
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;
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; and
said disconnection branch connecting said central branch potential point of said operating current path to said central branch potential point of said shunt current branch.

2. The device according to claim 1 , wherein said commutation device has drivable power semiconductor switches being at least partially constructed to generate a back-emf suppressing fault currents in said at least one mechanical switch to be opened.

3. The device according to claim 2 , wherein said drivable power semiconductor switches include at least one thyristor disposed in said operating current path.

4. The device according to claim 1 , wherein said at least one inductive component part of said commutation device includes at least two inductive component parts being coupled inductively to one another.

5. The device according to claim 1 , which further comprises inductive component parts disposed at least one of between said central branch potential point of said operating current path and one of said mechanical switches or between said central branch potential point of said shunt current branch and one of said at least one of two mechanical switches or two power semiconductors.

6. The device according to claim 5 , which further comprises at least one inductive component part disposed in said disconnection branch and inductively coupled to at least one inductive component part of at least one of said operating current path or said shunt current branch.

7. The device according to claim 1 , wherein said disconnection branch is configured to bypass a section of said operating current path, and at least one inductive component part is disposed in said section of said operating current path being bypassed by said disconnection branch.

8. 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.

9. 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.

10. The device according to claim 9 , wherein said two inductive component parts have the same number of windings.

11. The device according to claim 9 , wherein said two inductive component parts being coupled inductively to one another have a different number of windings.

12. 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.

13. The device according to claim 1 , wherein said commutation device exclusively includes inductive component parts.

Assignees

• Siemens Ag

Inventors

• Ergin Dominik
• Knaak Hans-Joachim
• Zenger Richard

Classifications

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title

• H01H33/596

  for interrupting DC · CPC title

• H01H9/542 Primary

  Contacts shunted by static switch means · CPC title

• H01H9/548

  Electromechanical and static switch connected in series · CPC title

• H02H3/08 Primary

  responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) · CPC title