Protective relay system and protective relay device
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United States of America Patent
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Jan 16, 2018
Grant Date -
Nov 19, 2015
app pub date -
Dec 16, 2013
filing date -
Jan 15, 2013
priority date (Note) -
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Abstract
A protective relay system includes plural protective relay devices protecting a power system based on electrical quantity data from the power system, and a communication between the protective power devices is performed via a network. The protective relay device includes a clock unit periodically clocking a timing at which sampling is performed on an electrical quantity of the power system, a relay computing unit performing a relay computation based on the electrical quantity data having undergone the sampling and electrical quantity data received via the network, a random-number creating unit creating a random number, and a synchronization-frame processing unit setting a timing of sending a synchronization frame to another protective relay device via the network based on the random number created by the random-number creating unit.
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