Distance protection relay and method

Distance protection relay and method

The invention relates to a protective relay for an electrical power distribution system. The protective relay comprises first and second current transformers arranged to sense a respective current flowing into a power line, and a voltage sensing device arranged to sense the voltage of the power line...

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Hauptverfasser: EINARSSON, TORBJOERN, GAJIC, ZORAN, GANESAN, SETHURAMAN
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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creator EINARSSON, TORBJOERN
GAJIC, ZORAN
GANESAN, SETHURAMAN
description The invention relates to a protective relay for an electrical power distribution system. The protective relay comprises first and second current transformers arranged to sense a respective current flowing into a power line, and a voltage sensing device arranged to sense the voltage of the power line. The protective relay further comprises a first and a second device for determining the direction of a fault within the system based on a current signal from the first and second current transformers and a voltage signal from the voltage sensing means. The protective relay further comprises a third device for determining the fault direction based on a sum of the current signals from the first and second current transformers and a voltage signal from said voltage sensing means. Controller means determines whether a fault is internal or external based on the fault directions determined by the first, second and third devices. The invention also relates to a corresponding method.
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subjects CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
title Distance protection relay and method
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