Read more on the webwww.nrelect.com 74read more on www.nrelect.comTheRCS-924relayprovidescurrentdifferentialprotection withovercurrentelementsforone-and-a-halfbreakerand ringbreakerapplications.Itintegrates3or4CTinputsfor three-terminal or four-terminal system. It provides overcurrent elementsforenergizingafaultybusorenergizingafaulty line. It is fully compatible with IEC 61850 communication.Functions3-terminal or 4-terminal current differential protection. (87)Two-level phase overcurrent protection. (50P/51P)Overcurrent protection for energizinga faulty bus or a faulty line. (50E)CT failure detection logic.Tripping/Closing circuit supervision.Current drift auto adjustment.Self diagnostic test.GPS clock synchronization.Fault Recorder.64trippingreports,64alarmreportsand64binaryinput status change reports.Highresolutionoscillographyoflast24oscillograms. (Compatible with international COMTRADE format)Rearcommunicationports:EthernetwithIEC61850or2 RS-485 with IEC 60870-5-103 protocol, 1 RS-485 with clock synchronization, 1 RS-232 or RS-485 with printer.Front communication port: 1 RS-232 for testing and setting.FeaturesCurrentdifferentialprotectionfor3-terminalor4-terminal connections. When one of the terminals is open, the relay will automatically become a 2-terminal or a 3-terminal differential protection.The patented adaptive foating threshold method is adopted, whichisinsensitivetosystemunbalanceanddisturbance. Themeasuringelementcangetbothhighsecurityandhigh speed simultaneously.Overcurrent protection is provided in the relay for energizing a faulty bus or energizing a faulty line.Innovativetechnologytopreventanyundesiredtripcaused byanycomponentfailureisadopted.Therelayhastwo independentdataacquisitionpaths,oneforafaultdetector and the other for protection and its logic. Tripping outputs are supervised by the fault detector to prevent any mal-operation.Theconnectortypecanbeselectedasplugin/outterminal connectororcrimpterminalconnector.Theuniqueplugin/outterminalconnectorsfromtherelayrearpaneltothe terminalblocksontherackorcabinetmakestheon-site commissioningandreplacementmucheasierthanthe traditional screw terminals when you do the commissioning.Ont hepr emi seof 24sampl esper cycl e, al l dat a measurement,calculationandlogicdiscriminationcouldbe donewithinonesamplingperiod.Theeventrecordingand protection logic calculation are completed simultaneously.TherelayprovidesGPSclocksynchronization,including message, secondpul se, mi nut epul seandI RI G- B synchronization.Theformatofeventreportiscompatiblewithinternational COMTRADE fle.Therelayiscompatiblewithmultipleprotocols-IEC61850 andIEC60870-5-103.Itprovidesnetworkinginterfacesuch as RS485, RS232 and Ethernet port.RCS-924Stub Differential Relay