Protective relay system and protective relay device

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 cl...

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Bibliographische Detailangaben
Hauptverfasser:	Mori Takahiro, Kawarada Akira, Sugiura Hideaki, Inukai Michihiko, Nishida Tomonori
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER COUNTING ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS FUNCTIONAL ELEMENTS OF SUCH SYSTEMS GENERATION MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING
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Beschreibung
Zusammenfassung:	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.