Switch for a transmission path for high-voltage direct current

Patent metadata

Field	Value
Publication number	US-9240680-B2
Application number	US-201214006749-A
Country	US
Kind code	B2
Filing date	Mar 5, 2012
Priority date	Mar 22, 2011
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A switch for a high-voltage direct current transmission path includes a vacuum circuit breaker for disconnecting the transmission path and a gas-insulated circuit breaker for disconnecting the transmission path. The gas-insulated circuit breaker is connected in series with the vacuum circuit breaker. A device is provided for building up a counter-current against the current in the transmission path for the purpose of reducing the current across the vacuum circuit breaker. The elements of the switch are actuated by a control device in such a way that the switch is switched off at or close to the zero crossing of the current.

First claim

The invention claimed is:

1. A switch for a high-voltage direct current transmission path, the switch comprising:
a series circuit including a first switching device and a second switching device, said first switching device configured for interrupting current and said second switching device configured for voltage isolation; and
a device configured for building up a counter-current against a current in the transmission path for reducing a current through said switching devices, said device for building up the counter-current being connected in parallel with said first switching device and including a high-voltage capacitor and a third switching device connected in series with said high-voltage capacitor, said third switching device being a thyristor.

2. The switch according to claim 1 , wherein said first switching device has a vacuum circuit breaker.

3. The switch according to claim 1 , wherein said second switching device has a gas-insulated circuit breaker.

4. The switch according to claim 1 , which further comprises a device connected in series with said first switching device for limiting a current rise.

5. The switch according to claim 4 , wherein said device for limiting a current rise includes an inductance in series with a parallel circuit having a nonlinear inductance and a capacitance.

6. The switch according to claim 1 , which further comprises a control device configured to determine a change in a current with respect to time and to determine therefrom a presence of a short circuit and, if a short circuit is present, to output control signals causing said first switching device to open.

7. The switch according to claim 6 , wherein said control device is configured to drive said device for building up a counter-current, if a short circuit is present, to build up a counter-current and to drive said first switching device to switch off at a lowest possible magnitude of a current.

Assignees

• Hartmann Werner
• Jaenicke Lutz-Ruediger
• Kosse Sylvio
• Maier Reinhard
• Panagou Anthoula
• Trapp Norbert
• Siemens Ag

Inventors

• Hartmann Werner
• Jaenicke Lutz-Ruediger
• Kosse Sylvio
• Maier Reinhard
• Panagou Anthoula
• Trapp Norbert

Classifications

• H01H89/00

  Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass · CPC title

• H02J3/36

  Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links · CPC title

• Y02E60/60

  Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD] · CPC title

• H01H33/596 Primary

  for interrupting DC · CPC title

• H02H3/08 Primary

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