Abb Technology Ag

Abb Schweiz Ag

Jurgen Häfner

Gunnar Asplund

Bertil Berggren

Lars-Erik Lennart Juhlin

Lidong Zhang

Kerstin Linden

A high voltage DC breaker apparatus configured to break a fault current occurring in a high voltage DC conductor includes a current limiting arrangement having at least one section with at least one semiconductor device of turn-off type and at least one arrester connected in parallel therewith, and a mechanical DC breaker connected in series with the current limiting arrangement and including a mechanical switch. The mechanical DC breaker is configured to enable breaking of a fault current in said DC conductor once said semiconductor devices of said arrangement have been turned off.

High voltage DC breaker apparatus

A DC grid () comprising a plurality of AC/DC converters () which are interconnected via DC lines () is provided, wherein, in order to limit the effects of a fault in the DC grid, the DC grid is divided into at least two zones () by means of at least one current limiter () in a manner so that a current limiter is connected in each of the DC line(s) () by which two zones are interconnected. A method of limiting the effects of a fault in a DC grid by dividing the DC grid into at least two zones is also provided.

DC grid and a method of limiting the effects of a fault in a DC grid

A high voltage DC switchyard comprises at least one busbar, at lest two DC lines connected to said at least one busbar through DC breakers comprising a section of at least one semiconductor device of turn-off type and rectifying member in anti-parallel therewith. At least one said DC line is connected to at least one said busbar through a unidirectional said DC breaker, i.e. a DC breaker that may only block current therethrough in one direction.

High voltage DC switchyard with semiconductor switches

A current-limitation system for limiting a current through an DC connection in case of a fault occurring in a DC grid of which the DC connection forms a part is provided, as well as a method of operating a current-limitation system for limiting a current through an DC connection in case of a fault occurring in a DC grid of which the DC connection forms a part.

Growing community of inventors

Ludvika, Sweden

Jurgen Häfner