Areva T&d UK Limited

General Electric Technology Gmbh

Schneider Electric Energy UK Ltd.

Branislav Cvorovic

Harmeet Kang

A method of determining out of step condition and an instance of separation within electrical power system. The method does not require user settings and ensures reliable discrimination between recoverable power swing and pole slips that indicates non-recoverable power swing and the need for system separation. The method also allows tripping at a user selected system angle if desired. A calculated angle is used to determine the magnitude of the swing current to control the tripping at the desired angle &#x3b8; when the system could be safely split after detection of out of step condition based on the criteria of this invention.

Method for setting free detection of out of step condition in electrical power system

A method of supervising the operation of a plurality of current transformers arranged in respective groups and connected to a protection relay forming part of a three-phase electrical power system includes determining a current ratio at an output of each group of current transformers, comparing each current ratio with a predetermined high ratio, comparing each current ratio with a predetermined low ratio, and generating a fault indication when the current ratio at one location exceeds the predetermined high ratio and the current ratio at the or each other location remains below the predetermined low ratio.

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Stafford, United Kingdom

Branislav Cvorovic