DIGITAL PROTECTION RELAY AND THRESHOLD LEARNING METHOD OF DIGITAL PROTECTION RELAY

DIGITAL PROTECTION RELAY AND THRESHOLD LEARNING METHOD OF DIGITAL PROTECTION RELAY

A digital protection relay (1) includes: an A/D conversion unit (12) configured to sample inputted AC current at regular intervals; a calculation processing unit (13) configured to perform frequency analysis on the basis of a sampled digital value; a control unit (14) configured to inhibit the inter...

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1. Verfasser: MIYAUCHI, Toshihiko
Format: Patent
Sprache:eng ; fre ; ger
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CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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creator MIYAUCHI, Toshihiko
description A digital protection relay (1) includes: an A/D conversion unit (12) configured to sample inputted AC current at regular intervals; a calculation processing unit (13) configured to perform frequency analysis on the basis of a sampled digital value; a control unit (14) configured to inhibit the interruption operation when a proportion of a harmonic extracted by the calculation processing unit (13) is equal to or greater than a threshold set on the basis of a proportion of a harmonic contained in excitation inrush current; and a threshold learning unit (15) configured to, when excitation inrush current flowing through the transformer has occurred, calculate an update value for the threshold on the basis of a harmonic content rate of a harmonic contained in the excitation inrush current that has occurred.
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subjects CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
title DIGITAL PROTECTION RELAY AND THRESHOLD LEARNING METHOD OF DIGITAL PROTECTION RELAY
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