Alstom Technology Limited

Schneider Electric Energy UK Ltd.

Alstom Grid UK Limited

Areva T&d UK Limited

Simon Richards

Sankara Subramanian

Alan Wixon

A method and an apparatus for dynamic signal switching with multiple measurement sources, for a merging unit in an electrical power system, said merging unit receiving at least two input signals from at least one current transformer measuring the same physical primary quantity. The method comprises a step of outputting from said merging unit, in a real-time mode, a digitized output stream of sampled values with the truest representation of the physical primary quantity, based on the actual values of the input signals.

Method and apparatus for dynamic signal switching of a merging unit in an electrical power system

A method of monitoring the grading margin between at least two time-current characteristics of Intelligent Electronic Devices (IED, IED) installed in an electrical power system, each Intelligent Electronic Device comprising a counting means, the grading margin comprising a safety margin set by a user, characterized in that it comprises, when a fault occurs which causes a fault current in the electrical power system, a step of providing a warning to the user when the safety margin is infringed upon.

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Abbots Bromley, United Kingdom

Simon Richards