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Lars Hermansson

Bruno Halvarsson

Urban &angst;str&ouml;m

Tomas Roininen

Per Olof Thuresson

Stefan Valdermarsson

The invention relates to a circuit breaker, preferably for high or medium voltage. The movable conact of each breaker pole is connected, via mechanical means for transmitting movement, to a movable part of an electric motor (). The movable contact and the means for transmitting movement are arranged in a gas-tight apparatus chamber () surrounded by a gas-tight apparatus housing () of insulating material such as porcelain. In accordance with the invention the motor () is arranged entirely in the apparatus chamber (). The invention also relates to an electric plant provided with the breaker claimed, uses of the breaker claimed and a method of breaking electric current in which the breaker claimed is used.

Circuit breaker

A plant for transmitting electric power with a direct voltage network and at least two stations connected thereto with line commutated valves ( ) with bidirectionally controlled thyristors (BCT) with ability to conduct current in both directions therethrough as rectifying semiconductor components, comprises at least one cable ( ) with an insulating mantle with a polymer base surrounding the conductor thereof for forming the direct voltage network interconnecting the stations. The plant has also a unit ( ) adapted to control the thyristors of the valves for changing the power feeding direction between the stations through changing the current direction in said cable.

Plant for transmitting electric power and a method for changing the direction of power transmission in such a plant

In a plant for transmitting electric power between two stations (,) through a direct voltage network (,) for High Voltage Direct Current an arrangement (,) is arranged for draining electric power from the direct voltage network. The arrangement has a valve (,) made of bidirectionally controlled thyristors (BCT) with ability to conduct current in both directions therethrough. The plant has also a unit (,) adapted to control the thyristors of the valve so that the current direction between the direct voltage network and the valve is such that electric power is fed from the direct voltage network to an alternating voltage network- connected to the valve independently of the power feeding direction between said two stations (,).

Plant for transmitting electric power including bidirectionally controlled thyristors (BCT)

HVDC transmission system with bidirectionally controlled thyristors

Method for reconstruction of a plant for transmitting electric power as

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Västerås, Sweden

Lars Hermansson