Abb Ab

Asea Brown Boveri Ab

Anders Sunesson

Jan Isberg

Hans Bernhoff

Mats Ekberg

Mats Leijon

Bertil Berggren

Peter Isberg

Erik Johansson

Li Ming

Pan Min

Dan Windmar

Mikael Bergkvist

Mark Irwin

&angst;ke &Ouml;berg

A photoconductive switch comprises a first layer (,), two contact layers (,) arranged on said first layer and connectable to different potentials for applying a voltage thereacross, said first layer being adapted to be conducting upon applying a voltage across said contact layers when exposed to light from an illumination source of an energy high enough for lifting charge carriers from the valence band to the conduction band of the material of said first layer. The illumination source is an excimer lamp, in which unstable electronically excited dimers are formed when a voltage is applied across first and second electrodes (,) separated by a gas or gas mixture. The dimers so formed decompose into two gas atoms while emitting a photon of an energy suitable for lifting charge carriers from the valence band to the conduction band of the material of the first layer.

Photoconductive switch

This invention is related to a device and a method in an electric power plant for protection of an object (,) against over-currents from a network (,) or another equipment included in the high voltage plant, the device comprising a switching device (,) in a line (,) between the object and the network/equipment. The line (,) between the object and the network/equipment is connected to an arrangement (,) reducing over-currents towards the object (,), said arrangement (,) being actuatable for over-current reduction with the assistance of an over-current condition detecting arrangement (,) within a time period substantially less than the break-time of the switching device (,).

Device and method relating to protection of an object against over-currents comprising over-current reduction

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Åkarp, Sweden

Anders Sunesson