Alternating current line protection method and system based on wavefront index coefficient

Alternating current line protection method and system based on wavefront index coefficient

The invention discloses an alternating-current line protection method and system based on a wavefront index coefficient, and the method comprises the steps: collecting a, b and c three-phase voltages and currents of a power transmission line through a traveling wave voltage sensor, and carrying out...

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Hauptverfasser: YAN JIFEI, TSUNENAKA MANABU, ZHANG CHENHAO, SONG GUOBING
Format: Patent
Sprache:chi ; eng
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CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
SYSTEMS FOR STORING ELECTRIC ENERGY
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creator YAN JIFEI
TSUNENAKA MANABU
ZHANG CHENHAO
SONG GUOBING
description The invention discloses an alternating-current line protection method and system based on a wavefront index coefficient, and the method comprises the steps: collecting a, b and c three-phase voltages and currents of a power transmission line through a traveling wave voltage sensor, and carrying out the phase-mode transformation, and obtaining a modulus voltage um and a current im; starting protection according to the break variable of the modulus voltage [mu] m; calculating a voltage reverse traveling wave according to the modulus voltage um and the current im break variable; extracting the arrival time of the wave head of the second traveling wave in a given time window by using a wavelet modulus maximum method by using the voltage reverse traveling wave, then extracting data window data from the starting time to the arrival time of the wave head of the second traveling wave, and judging the fault direction through a fault direction criterion; and when the fault direction is a positive direction fault, fitti
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subjects CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
SYSTEMS FOR STORING ELECTRIC ENERGY
title Alternating current line protection method and system based on wavefront index coefficient
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