WIXLIB

L90 Line Differential Systemdifferent earthing conditions, lines with in-zonetransformers or tapped transformer feeders,and overhead lines with series compensation.Each zone element for the phase and grounddistance can be independently set as quador mho characteristics with the flexibility ofdesigning different characteristic shapesto suit different power system conditions.The advanced comparator-based distanceelements provide the utmost security, sensitivityand selectivity for different types of faults.Superior digital filtering techniques providesecure and optimum reach accuracy evenunder worst-case CCVT transients. Securedirectional discrimination is achieved by usingpositive sequence memory voltage polarization,providing reliable directionality for worst-caseclose-in faults. Dual distance algorithms deliverexceptional security and speed performance toensure average operating times of 1.5 cycles for75% line reach and SIR 30, and 2.5 cycles for90% line reach and SIR 60.The L90 employs a well-proven algorithm forphase selection, which provides faster, secureand reliable faulted phase identification forsingle-pole tripping and proper fault-distancecalculation for a variety of power systemconditions. An additional voltage monitoringfunction provides extra security to the distanceelement , which can be used to block thedistance elements under voltage source fusefailure conditions.In-Zone Transformer CompensationPhase distance protection in the L90 can beused to detect faults through different types ofthree-phase wye/delta transformers, allowingapplication of the L90 for backup protectionon generators. VTs and CTs can be installedindependently of each other on either side ofthe power transformer. The relay automaticallycompensates for transformer connections, toguarantee accurate reach for any type of fault.Line Pickup (Switch-on-to Fault)Overcurrent FunctionsThe line pickup feature uses a combination ofundercurrent and undervoltage to identify aline that has been de-energized (line end open).Three instantaneous overcurrent elements areused to identify a previously de-energized linethat has been closed on to a fault.The L90 provides thermal overload, and timeand instantaneous overcurrent elements forphase, neutral, ground, negative sequence,phase and neutral directional. The neutraldirectional overcurrent element supportsenhanced dual polarization modes which canbe configured to prioritize on voltage or currentpolarization. Any of them can run in parallelwith primary differential protection or canbe programmed to run when the differentialelement is not available.Power Swing DetectionDynamic transients in the power system, due toshort-circuits, circuit switching, or load unbalancechanges, can travel across the power networkas power swings (characterized by fluctuatingcurrents and voltages). This can result in unwantedtripping since distance elements can respondto these power swings as faults. The L90 powerswing detection element provides both powerswing blocking and out-of-step tripping functions.The element measures the positive sequenceapparent impedance and traces its locus withrespect to either a two or three-step userselectable mho or quad operating characteristic.Negative sequence current supervisors provideextended selectivity for detecting evolving faultsthat may appear as a power swing event (faultswith slow moving impedance locus).Series Compensated LinesThe L90 provides enhanced stability andsecurity by employing an adaptive distancereach control to cope with the overreachingand sub-synchronous oscillations when appliedto, or in the vicinity of, series compensatedlines. For directional integrity the relay usesmemory voltage polarization and a multi-inputcomparator to deal with current inversion issuesin series compensated lines.Single-Pole TrippingThe L90 relay uses a state-of-the-art dual phaseselection algorithm that provides fast andaccurate fault type identification even underweak infeed conditions.Load EncroachmentDirect Transfer Trip (DTT)The load encroachment feature offersdiscrimination between line loading conditionsand fault conditions, especially for long linesunder heavy loads by supervising the distanceelements or any overcurrent element . Thisprevents unwanted tripping under heavyline load conditions and enables optimumoperation of the line while meeting regulatoryrequirements for line loading.Use the DTT feature of L90 to trip remotebreakers. Both single and three-pole DTTs aresupported. Up to eight signals can be sent overpilot communications channels, selectablethrough user-configurable logic.4Overvoltage and Undervoltage ProtectionLong lines under lightly loaded or no-loadconditions may experience voltages exceedingrated per unit voltage level of the line. Use thethree-phase overvoltage elements of the L90 toinitiate a local trip as well as a remote trip usingDirect Transfer Tripping DTT.GEDigitalEnergy.comCommunication Aided (Pilot) SchemesL90 supports different teleprotection functionsfor fast fault clearance for any faults within theprotected line. The following types of pilot-aidedschemes are available in the L90: Direct Underreach Transfer Trip (DUTT) Permissive Underreach Transfer Trip forDistance and Current (PUTT) Two Permissive Overreach Transfer Trip (POTT) Hybrid Permissive Overreach Transfer Trip(HYB POTT), permissive echo and transientblocking logic incorporated Directional Comparison Blocking Scheme (DCB) Directional Comparison Unblocking Scheme(DCUB) Customizable version of the POTT and DCBschemes (POTT1 and DCB1)AutoreclosingThe L90 provides multi-shot autoreclosing (upto 4 shots) for single or three-pole autorecloseon all types of faults with independent settingsfor each shot. Any of the autoreclose elementscan be dynamically blocked or unblocked byother elements or user logic. This way they canbe coordinated with the L90 protection settinggroups. Four different autoreclose operationmodes are available, enabling users to select theautoreclosing mode to suit specific applications.Synchronism CheckThe L90 provides four synchrocheck elementsthat monitor voltage difference, phase angledifference and slip frequency, to ensure properbreaker closure as per user requirements. Anyof the four synchrocheck elements can bedynamically blocked or unblocked by otherelements or user logic. The L90 also providesadditional enhancements in synchronizing byallowing synchrocheck verification betweenlocal and remote line terminal voltages.

L90 Line Differential SystemBreaker FailureHardFiber System benefits:The L90 is able to provide fully independentbreaker failure protection for the breakersassociated to the line when connected to asubstation with a breaker-and-a-half or ringbus arrangement. The L90 provides the requiredelements to perform two independent breakerfailure functions. Communicates using open standardIEC 61850 messaging Flexible, modular I/O covering a broad rangeof input signals and tripping schemes Mechanically latching outputs can be used todevelop secure interlocking applications andreplace electromechanical lockout relays Drastically reduces P&C design, installationand testing labor by eliminating individualcopper terminationsMonitoring and Metering Integrates with existing L90’s by replacingtraditional CT/VT inputs with the IEC 61850Process Bus moduleMultiple Breaker ConfigurationsThe L90 includes high accuracy meteringand recording for all AC signals. Voltage,current , and power metering are built intothe relay as a standard feature. Current andvoltage parameters are available as total RMSmagnitude, and as fundamental frequencymagnitude and angle. Does not introduce new cyber securityconcernsThe L90 supports multi-breaker busbarconfigurations, such as breaker-and-a-half orring bus arrangements, providing dual breakerautoreclose dual synchrocheck elements, anddual independent breaker failure elements.The design provides secure operation duringexternal faults with possible CT saturation.Advanced AutomationThe L90 incorporates advanced automationfeatures including powerful FlexLogic programmable logic, communication, andSCADA capabilities that far surpass whatis found in the average line relay. The L90integrates seamlessly with other UR relays forcomplete system protection.Special Applications - Distributed BusbarUse the L90’s capability of supporting up to 4directly connected CTs for applications wherethe use of conventional bus differential relayingis not practical or economically feasible. TheL90 can be used to protect both line and busesby measuring currents from the feeder CTs asshown. The L90 provides primary protection forboth the buses and the circuit connecting them.Fault and Disturbance RecordingThe advanced disturbance and event recordingfeatures within the L90 can significantly reducethe time needed for postmortem analysis ofpower system events and creation of regulatoryreports. Recording functions include: Sequence of Event (SOE)- 1024 time stamped eventsFlexLogicFlexLogic is the powerful UR-platformprogramming logic engine that provides theability to create customized protection and controlschemes, minimizing the need and associatedcosts of auxiliary components and wiring.IEC 61850 Process Bus Oscillography- 64 digital & up to 40 analog channels- Events with up to 45s length Data Logger and Disturbance Recording- 16 channels up to 1 sample/cycle/channelUsing FlexLogic, the L90 can provide requiredtripping and custom scheme logic for linebreaker control and interlocking and dynamicsetting group changes.The IEC 61850 Process Bus module is designedto interface with the Multilin HardFiber System, allowing bi-directional IEC 61850 fiberoptic communications. The HardFiber System isdesigned to integrate seamlessly with existingUR applications, including protection functions,FlexLogic, metering and communications. Fault Reports- Powerful summary report of pre-fault andfault values Multi-Ended Fault Location- Calculation of fault location on two or threeterminal lines with 2% accuracyScalable HardwareThe L90 is available with a multitude of I/Oconfigurations to suit the most demandingapplication needs. The expandable modulardesign allows for easy configuration and CB2CB3CB4VT21PH1PHCommunication e of Distributed Bus Differential Protection Application.PROTECTEDLINE831783A1.CDRL90 Breaker-and-a-Half Application Example.GEDigitalEnergy.com5

L90 Line Differential SystemThe very high sampling rate and large amountof storage space available for data recordingin the L90 can eliminate the need for installingcostly stand-alone recording equipment.Advanced Device Health DiagnosticsThe L90 performs comprehensive device healthdiagnostic tests at startup and continuouslyduring run-time to test its own major functionsand critical hardware. These diagnostic testsmonitor for conditions that could impact securityand availability of protection, and present devicestatus via SCADA communications and the frontpanel display. Providing continuous monitoringand early detection of possible issues helpimprove system uptime.CommunicationsThe L90 provides for secure remote data andengineering access, making it easy and flexibleto use and integrate into new and existinginfrastructures. Fiber optic Ethernet provideshigh-bandwidth communications allowing forlow-latency controls and high-speed file transfersof relay fault and event record information. Theavailable redundant Ethernet option and theembedded managed Ethernet switch provide themeans to create fault tolerant communicationarchitectures in an easy, cost-effective manner.The L90 supports the most popular industrystandard protocols enabling easy, directintegration into monitoring and SCADA systems. Comprehensive device health diagnosticperformed at startup IEC 61850 Ed. 2 with 61850‑9‑2 and61850‑90‑5 support Monitors the CT/VT input circuitry to validatethe integrity of all signals DNP 3.0 (serial & TCP/IP)Cyber Security – CyberSentry URCyberSentry UR enabled UR devices deliver fullcyber security features that help customers tocomply with NERC CIP and NIST IR 7628 cybersecurity requirements. This software optiondelivers the following core features:AAA Server Support (Radius/LDAP)Enables integration with centrally managedauthentication and accounting of all useractivities and uses modern industry bestpractices and standards that meet and exceedNERC CIP requirements for authentication andpassword management.Role Based Access Control (RBAC)Efficiently administrate users and roles withinUR devices. The new and advanced accessfunctions allow users to configure up to fiveroles for up to eight configurable users withindependent passwords. The standard “RemoteAuthentication Dial In User Service” (Radius) isused for authentication.Event Recorder (Syslog for SEM)Capture all cyber security related events withina SOE element (login, logout, invalid passwordattempts, remote/local access, user in session,settings change, FW update, etc), and thenserve and classify data by security level usingstandard Syslog data format. This will enableintegration with established SEM (Security EventManagement) systems.6 Ethernet Global Data (EGD) IEC 60870-5-103 and IEC 60870-5-104 Modbus RTU, Modbus TCP/IP HTTP, TFTP, SFTP and MMS file transfer SNTP and IEEE 1588 for time synchronization PRP as per IEC 62439-3Interoperability with EmbeddedIEC 61850 Edition 2The new IEC 61850 implementation in the URFamily positions GE as an industry leader in thisstandard. Implements Edition 2 of the standard acrossthe entire family of UR devices Provides full relay setting management viastandard SCL files (ICD, CID and IID) Enables automated relay settingmanagement using 3rd party tools throughstandard file transfer services (MMS and SFTP) Increases the number of Logical Devices anddata mapped to them, GOOSE messages, andreports to support different organizationalneeds for data transfer and reducedependency on generic logical nodes Configures GE Systems based on IEC 61850using universal 3rd party tools Multicast IEEE C37.118 synchrophasordata between PMU and PDC devices usingIEC 91850-90-5LAN RedundancySubstation LAN redundancy has beentraditionally accomplished by reconfiguringthe active network topology in case of failure.Regardless of the type of LAN architecture (tree,mesh, etc), reconfiguring the active LAN requiresGEDigitalEnergy.comtime to switchover, during which the LAN isunavailable. UR devices deliver redundancy asspecified by PRP-IEC 62439-3, which eliminatesthe dependency on LAN reconfiguration and theassociated switchover time. The UR becomes adual attached node that transmits data packetsover both main and redundant networkssimultaneously, so in case of failure, one of thedata packets will reach the receiving device withno time delay.Multi-LanguageUR devices support multiple languages: English,French, Russian, Chinese, Turkish and German.These language options are available on thefront panel, in the EnerVista setup software, andin the product manuals. Easily switch betweenEnglish and an additional language on the localdisplays without uploading new firmware.EnerVista SoftwareThe EnerVista suite is an industry-leading setof software programs that simplifies everyaspect of using the L90 relay. The EnerVistasuite provides all the tools to monitor the statusof the protected asset, maintain the relay, andintegrate information measured by the L90 intoDCS or SCADA monitoring systems. ConvenientCOMTRADE and SOE viewers are an integral partof the UR setup software included with every URrelay, to carry out postmortem event analysisand ensure proper protection system operation.EnerVista LaunchpadEnerVista Launchpad is a powerful softwarepackage that provides users with all of the setupand support tools needed for configuring andmaintaining Multilin products. The setup softwarewithin Launchpad allows for the configuration ofdevices in real-time by communicating via serial,Ethernet, or modem connections, or offline bycreating setting files to be sent to devices at a latertime.Included in Launchpad is a document archivingand management system that ensures criticaldocumentation is up-to-date and availablewhen needed. Documents made availableinclude: Manuals & Brochures Application Notes Guideform Specifications Wiring Diagrams FAQ’s Service Bulletins

L90 Line Differential SystemViewpoint MonitoringTypical WiringViewpoint Monitoring is a simple-to-use andfull-featured monitoring and data recordingsoftware package for small systems. ViewpointMonitoring provides a complete HMI packagewith the following functionality:ABC52 Plug-&-Play Device Monitoring System Single-Line Monitoring & ControlN Annunciator Alarm 5IC5F1aF1bIA Automatic Event RetrievalIA5OPTIONAL Trending Reports Automatic Waveform Retrieval8LViewpoint UR EngineerH5aH5cH6aH6cH5bViewpoint UR Engineer is a set of powerful toolsthat will allow the configuration and testingof GE relays at a system level in an easy-touse graphical drag-and-drop environment .Viewpoint UR Engineer provides the followingconfiguration and commissioning 56K6DN4N5N6L7aL7cL8aL8cL7bL8bEnerVista -RELAYCOMMS.W7ATx1Tx2B1bB1aB2bB3aB3bB5b HIB6b DB-9(front)1 Single-Click Fault Data TOREMOTEL90VN2L3aL3cL4aL4cL3b Device Health ReportVIU6L1aL1cL2aL2cL1b Settings Security Audit ReportVIL90Viewpoint Maintenance provides tools thatwill create reports on the operating status ofthe relay, simplify the steps to download faultand event data, and reduce the work requiredfor cyber security compliance audits. Toolsavailable in Viewpoint Maintenance re* OpticTx110BaseFLNORMALRx1 OPC/DDE eTRemoteDeviceD1aD2aD3aD4bD4a Automatic Event 45678983 RXD2 TXD207 putBNCCo-axialIRIG-BOutputBNCCo-axialThe L90 front panel provides extensive localHMI capabilities. The local display is used formonitoring, status messaging, fault diagnosis,and device configuration. User-configurablemessages that combine text with live data can bedisplayed when user-defined conditions are met.VIU4Viewpoint MaintenanceUser InterfaceVSURGETC 6bU6cVIU2U8b Graphical System Monitor Automatic Waveform RetrievalVI6H Graphical Logic Monitor Multilin DriversVI Graphical System DesignerEnerVista Integrator is a toolkit that allowsseamless integration of Multilin devices intonew or existing automation systems. Included inEnerVista Integrator is:VIH3H8b Graphical Logic DesignerVIH7aH7cH8aH8cH7bTC 1H1aH1bH1cH2aH2bH2cH3aH3bH3cH4aH4bH4cI6GminimumX WPROVIDEDVUTS766Inputs/ Inputs/COM outputs outputs**RPNML66Inputs/ Inputs/outputs outputs**KH 7

OrderingL90 - * 00 - H * * - F ** - H ** - L ** -N ** - S **- U** -W/X ** For Horizontal MountBase UnitL90 Base UnitCPU E RS485 RS485 (IEC 61850 option not available)J RS485 multimode ST 100BaseFXK RS485 multimode ST Redundant 100BaseFXN

The Multilin L90 is a high-end line current differential protection relay intended for transmission lines and cables of different voltages levels, providing reliable and secure operation even under the worst case power system conditions. The L90 provides high-speed phase-segregated fault clearance, suitable for single and three-pole