A METHOD AND AN APPARATUS FOR SUPERVISION OF CURRENT TRANSFORMER IN A DIFFERENTIAL PROTECTION SYSTEM

A METHOD AND AN APPARATUS FOR SUPERVISION OF CURRENT TRANSFORMER IN A DIFFERENTIAL PROTECTION SYSTEM

A method and device are disclosed for supervising the operation of plural current transformers and for prevention of a malfunction, such as false tripping of power in an electrical system. Exemplary embodiments can include measuring current parameters (e.g., magnitude and phase angle) for each windi...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MURALI, KANDAKATTA, NAYAN, SHAH, JUHA, YLINEN
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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Beschreibung
Zusammenfassung:A method and device are disclosed for supervising the operation of plural current transformers and for prevention of a malfunction, such as false tripping of power in an electrical system. Exemplary embodiments can include measuring current parameters (e.g., magnitude and phase angle) for each winding in current transformer (CT) sets. A negative sequence current can be calculated from measured phase currents and a fault condition determined. A phase angle difference parameter derived from phase measurements between two healthy CTs can be used as an additional condition parameter for reliable operation of equipment in the electrical system.