CHAPTER 2: PRODUCT DESCRIPTION PRODUCT DESCRIPTIONL90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 2-32Figure 2-1: Single-line diagramTable 2-2: Other device functions2.1.2 Features2.1.2.1 Line current differential• Phase segregated, high-speed digital current differential system• Overhead and underground AC transmission lines, series compensated linesFunction Function FunctionBreaker Arcing Current (I2 t) Fault Locator OscillographyBreaker Control Fault Reporting Pilot SchemesBreaker Flashover FlexElements™ (8) Setting Groups (6)Broken Conductor Detection FlexLogic™ Equations Stub BusContact Inputs (up to 96) IEC 60870-5-103 Communications Synchrophasor (PMU)Contact Outputs (up to 64) IEC 61850 Communications Time synchronization over IRIG-B or IEEE1588Control Pushbuttons IEC 62351-9 Data and CommunicationsSecurityTime Synchronization over SNTPCT Failure Detector L90 Channel Tests Transducer Inputs/OutputsCyberSentry™ Security Line Pickup User Definable DisplaysData Logger Load Encroachment User Programmable LEDsDigital Counters (8) Metering: Current, Voltage, Power, Energy,Frequency, Demand, Power Factor, 87Lcurrent, local and remote phasors,harmonics, THDUser Programmable PushbuttonsDigital Elements (48) Modbus Communications User Programmable Self-TestsDirect Inputs (8 per L90 comms channel) Modbus User Map Virtual Inputs (64)Disconnect Switches Non-Volatile Latches Virtual Outputs (96)DNP 3.0 or IEC 60870-5-104 protocol Non-Volatile Selector Switch VT Fuse FailureEvent Recorder Open Pole Detector
