Presentation on theme: "UR - The Universal Relay"— Presentation transcript:
1UR - The Universal Relay gGE Power ManagementUR - The Universal Relay
2g UR Features GE Power Management FAMILY of relays built on a common platformCommon “look & feel” for ease of use product to productAll “bells & whistles”, present and future, available to whole familyReduced training time and drafting costsMODULAR architectureScaleable - accommodates a scaleable I/O architectureFlexible - accommodates different types of I/OUpgradeable - accommodates upgrading to new technologies
3g UR Features GE Power Management COMMUNICATIONS High-speed networking capability (Ethernet - fiber, redundancy)Multiple Protocols - UCA 2.0, DNP 3.0, Modbus, IECSUBSTATION Automation - System SolutionPMCS + UR with UCA 2.0 MMS/Ethernet
4Solution: Modular Software gGE Power ManagementSoftware IssuesSoftware accounts for 90% of digital relay designMost support functions are required in all types of relaysMarket needs are driving shorter development cyclesSolution: Modular Software
5g Modular Software GE Power Management ‘Object Oriented Design’ allows for scalable, flexible and re-useable software and featuresProtection ClassTOCIOCDistanceDifferentialFrequencyVolts/HzetcObjects
6Solution: Modular Hardware Design GE Power ManagementHardware IssuesMicroprocessor / Integrated Circuit Functionality is increasing exponentiallyComponents can become obsolete in 1 to 2 yearsUtility expect a 20+ year lifeSolution: Modular Hardware Design
7Modular Hardware Design GE Power ManagementModular Hardware DesignConceptPhysical Realization
8g Common Platform GE Power Management Common hardware modules Application SoftwareTransformerApplicationLineGeneratorFeederControl (PLC)Common hardware modulesCommon software modulesCapability to run a wide variety of applicationsResult: Universal Relay (UR)
9g Hardware GE Power Management Flash memory Draw-out modules for serviceabilityExpandable I/OField upgradable
10g Hardware GE Power Management 4RU, 19 inch rack-mount chassis Hinged faceplate allows easy access to modulesFaceplate can be mounted separately on doors for applications limited in depthExtension cable connects faceplate to main unit
11g Hardware - Modular I/O GE Power Management Configurable I/O via sub-modulesSub-Modules
12g Draw-Out Modules GE Power Management Modular design allows all modules to be easily inserted or removed for upgrading or repair. Field wiring is left undisturbed
13g Hardware - Interfaces GE Power Management CONTACT INPUTS (expandable)Configurable inputs may be used for:Breaker statusOscillography triggerControl inputsCONTACT OUTPUTS (expandable)Fully programmableTrip rated Form-A relaysForm-C relaysFast Form-C relays
14g User Interfaces GE Power Management PROGRAM UPDATING COMMUNICATIONS Flash memory storage of firmware for field updating via communications port. Enables product updating on-site for latest featuresCOMMUNICATIONSModbus RTU on 115 kbpsMMS/UCA 2.0 on Redundant 10BaseFPOWERFUL PROCESSORSNumerical data processing using a 32 bit CPU and DSP for high speed complex task processing
15g FlexLogic GE Power Management FlexLogic minimizes the requirement for auxiliary components and wiring while making more complex schemes possible.URPCThe power of this product comes from it’s ability to create user-defined logic through GE Flexlogicª. Flexlogicª includes the option of Virtual inputs. Virtual inputs are data values that are communicated over the LAN by the 10 MBit Ethernet LAN created at the substation. This allows the user to minimize wiring through using the communication line to send information from point to point.Traditionally, protective relay logic has been relatively limited and simplistic. Any unusual applications involving interlocks, blocking, or supervisory functions had to be hardwired using contact inputs and outputs if the requirement could be met at all. This would entail significant expense in implementation and troubleshooting, the only other option was to approach a manufacturer for a feature enhancement. If this approach was possible, it was rarely completed in a timely manner as the new feature had to be designed, implemented, and thoroughly tested. The advent of Flexlogicª minimizes the requirement for auxiliary components and wiring while making more complex schemes possible. The logic that determines the interaction of inputs, elements, and outputs is field programmable through the use of logic equations (“postfix” notation) that are sequentially processed. The use of virtual inputs and outputs in addition to hardware is available internally and on the communication ports for other relays to use (distributed Flexlogicª). Also, the F30 contact input/output capability is expandable. The contact inputs can accept wet or dry contacts and contact outputs can be trip rated Form-C or Form-A.
16Virtual Inputs / Outputs gGE Power ManagementVirtual Inputs / OutputsVirtual Inputs / Outputs extend the I/O capability of the relay to LAN communications.Virtual Inputs allow the user to combine and-gate, or-gate, inverters, counters and timers to create specific logics that can fit a customer’s unique requirements.
17Peer to Peer Communications gGE Power ManagementPeer to Peer CommunicationsNetworkablePeer to peer communicationsSelf-defining dataExternal data access via corporate WANPeer to peer communications: one can send virtual data from one relay to another without being told to do so. In effect the relays high speed communications enables the relay to send out information on it’s own. This is the far superior to a master-slave relationship because information is received on a continuous basis.Self-defining data: On power up the relay will identify itself to the host computer. The host computer will then query the relay and ask for all the data that the relay has. The relay will then download a complete database of objects into the host. The significance to this is that during software upgrades, the host will automatically be updated with the newest variables available inside the relay.Peer-to-peer communications and self-defining data are important because it enables the relays to continuously communicate bits of data to entire network of relays. This continuous stream of information is possible because the F-30’s high speed communication abilities which results in quicker detection and communication of faults. In a master-slave relationship, the master continuously pulls information from the slave. The consequences of this relationship are that the time needed to detect and communicate important information is lost.
18g Metering GE Power Management Current (Phase, Neutral and Ground) - Accuracy: ± 0.25% of reading or ± 0.1% of rating from 0.1 to 2.0 x CT rating (whichever is greater)Voltage (Vab Vbc Vca Van Vbn Vcn) -Accuracy: ± 0.25% of reading from 10 to 208 VApparent Power (VA) - Accuracy: ± 1.0% of readingReal Power (Watts) - Accuracy: ± 1% of readingReactive (Vars) - Accuracy: ± 1%Power Factor - Accuracy: ± 0.02
19g Monitoring GE Power Management Oscillography Event Recorder 64 samples / power frequency cycleAdjustable Memory (1 record / 128 cycles to 31 records / 8 cycles)6 Analog, 15 digital channels can be displayedSelectable triggersAdjustable trigger positionEvent Recorder1024 events, events are date and time stamped to nearest millisecondSelection of points to monitor (pickup, operation, logic, I/O)
20g Connectivity GE Power Management Communications URPC™ Integration ProtocolsPeer to Peer CommunicationsURPC™IntegrationGE Power Management has engineered the F-30 with the vision that this relay would be integrated easily into any system. To accommodate this specification we have focused on the following areas to enable the user to easily and effectively incorporate the F-30 relay into their power system.
21g Communications GE Power Management PROTOCOLS Modbus RTU protocol Standard Front Port: RS232Rear Port: RS485 up to 115kbpsUCA2Ô protocolApplication: MMSPhysical: 10BaseT (Ethernet) or 10BaseF (Fiber Optic)Transport layer ISO-OSI and TCP/IP
22Windows 95/ NT Based Software gGE Power ManagementURPC Program FeaturesWindows 95/ NT Based SoftwareView actual valuesView/edit setting on-lineView Event Recorder for troubleshootingUpgrade relay firmware programmingView relay StatusView/edit setting off-line with setting file managerOn-line instruction manualDownload & view oscillography in Comtrade formatThe Windows based F30PC program may be run on a PC with the Windows 95 or Windows NT operating system. The program may be used locally on the RS232 serial port or remotely on the other ports. It provides full access to the relay data with the following features:See above.Metered parameters that may be viewed with the F30PC program include current, voltage, apparent power (VA), real power (W), reactive power (var), and power factor. Current and voltage can be displayed in a graphical, phasor format. This is a particularly valuable feature that can reduce the troubleshooting of connection problems during commissioning. All status information such as target messages and digital input/output states may also be viewed with the PC program. Setting files may be created off-line (at a desk without an F30) or on-line (while communicating to an F30) and backup files may be stored to disk for future reference. The F30 stores a record of the last 1024 events. All events are date and time stamped to the nearest millisecond. Events consist of a broad range of change of state occurrences, including element pickups and operations, alarms, trips, contact operations, and setting changes. This provides the information needed to determine a sequence of events, which can reduce troubleshooting time and simplify report generation in the event of system faults. With the F30PC program, the event recorder is used as an index for quick access of snapshot records, setting change records, and oscillography records. Snapshot records store analog parameters and digital states at the time of the event. Setting change records store the old value and new value of any setting that has been altered and stored. The oscillography records captured by the F30 consist of current and voltage waveforms at 64 samples/cycle (up to 72 cycles), digital input states, and settings at the point of trigger. The number of pre-trigger and post-trigger cycles may also be selected. The event record, snapshot data, and setting change data may also be viewed on the faceplate display.
23Event Recorder Capture Screen gGE Power ManagementEvent Recorder Capture ScreenSnapshot DataOscillographic DataExample of the F30PC program.Settings Change DataThe three main types of data - Snapshot data, Oscillographic data, and Settings data - can be accessed from this screen, the Event recorder.
24gGE Power ManagementSnapshot DataExample of the F30PC program.
25g Oscillographic Data GE Power Management Example of the F30PC program.
26g Settings Change Data GE Power Management Example of the F30PC program.
27Staged release of enhancements to platform and individual relay models GE Power ManagementUR Relay TypesF30 Feeder Management Relay (9/98)L90 Line Current Differential (11/98)C30 Controller/Metering (2/99)C60 Controller/Metering/Breaker Failure (4/99)F60 Feeder Management Relay (4/99)T60 Transformer Management relay (4/99)D60 Line Distance Relay (5/99)L60 Line Current Phase Comparison Relay (6/99)Example of the F30PC program.Staged release of enhancements to platform and individual relay models
28Substation Automation gGE Power ManagementSubstation AutomationThe UR Relay is the Engine for Substation Automation
29UR - The Universal Relay gGE Power ManagementUR - The Universal Relay
30g GE Power Management UR L90 Line Differential Relay The F30 is a digital relay that provides feeder protection and power metering in one integrated package. The UR F-30 establishes a platform that will serve as the basis for all future relays. This platform is the result/answer to the industry’s requests to standardize the protocol communication functions of relays. It may be used as a stand alone device or as a component of an automated sub-station control system. The relay establishes the high performance platform that will serve as the foundation to a highly flexible and easily connectable network of relays that will better serve the user’s needs.UR L90 Line Differential RelayAn integrated transmission line protectionsystem for series compensated lines
31Power to Protect Your Lines gGE Power ManagementL90 Line Differential RelayPower to Protect Your LinesConnectivityModBus RTUMMS/UCA2TM ProtocolsSI CompatibilityFlexibilityThe F30’s is the first relay to be UCA 2.0 (Utility Communications Architecture) compliant. UCA 2.0 protocol is the protocol identified by EPRI to be the future in communications protocol. This means that when MMS (Manufacturing Messaging Specification) technology is applied a “plug-and-play” effect is created because the user can communicate with the relay by simply “plugging” into the unit. (The user must have a laptop computer equipped with MMS software.)UCA 2.0 protocol, MMS technology and “plug-and-play” performance gives the F-30 the added flexibility that makes this product highly accessible and allows for painless integration into any protection scheme.The results of a highly flexible, easily connectable relay are an enhanced ability to allow you to control and protect a power system. These features also make this relay ideal for systems integration projects.FlexCurvesFlexLogicFlexModulesOther FeaturesThe second Relay designed from the ground up around the MMS/UCA 2TM Ethernet communications standard. Giving you the flexibility, connectivity and power to manage your facility.
32Presentation Overview gGE Power ManagementL90 Line Differential RelayPresentation OverviewApplicationsProtection and ControlNew & Unique ConceptsUser InterfacesOrder Codes
33g Applications GE Power Management L90 Line Differential RelayApplicationsThe L90 is a digital current differential relay system intended to provide complete protection for transmission lines of any voltage level.Overhead Lines and CablesLines with 2 TerminalsEHV, HV, Sub-TransmissionWith/ without Series Compensation
34Transmission Line Protection & Metering GE Power ManagementL90 Line Differential RelayTransmission Line Protection & Metering
35g Protection & Control Functions GE Power Management L90 Line Differential RelayProtection & Control FunctionsCurrent Differential with Adaptive RestraintHigh Speed Tripping, 1/2 - 2 cyclesBackup OvercurrentDirect Transfer TripStub Bus ProtectionSensitive Ground InputThe F30 CT/VT module may be orderedas sensitive ground. The sensitiveground CT input is ten times more sensitive than the regular ground CT input.This enables the F30 to provide groundfault protection on high impedancegrounded or ungrounded systems andmay be especially important whenusing a residual CT connection todetect ground faults.Phase UndervoltageThe F30 has three individual phaseUndervoltage elements (all with identical programmable characteristics):* Pickup level* Definite time or inverse time curve* Minimum operating voltageprotection are:* Protection for sensitive loads such asinduction motors* Permissive functions such as blocking of elements or external devices* Automatic re-Energization schemesThree Phase, Neutral andGround InstantaneousOvercurrentThe F30 instantaneous overcurrent protection includes:* Three individual phase instantaneousovercurrent elements (all with identical characteristics)* Neutral instantaneous overcurrentelements* Ground instantaneous overcurrentDC offset is removed from the input signal to prevent overreach. Each instantaneous overcurrent element has the following programmable characteristics:* Pickup level* A time delay during which currentmust exceed the pickup for operationThree Phase, Neutral andGround Time OvercurrentThe F30 time overcurrent protectionincludes:* Three individual phase time overcurrent elements (all with identical characteristics)* Neutral time overcurrent element* Ground time overcurrent elementNeutral elements operate on the calculated 3I0 current; ground elements operate on the ground input current.Each time overcurrent element has thefollowing programmable characteristics:* Pickup level* Choice of 13 standard curve shapes,2 FlexCurvesª and curve multipliersn Instantaneous and electromechanicalreset time characteristic
36Current Differential Scheme gGE Power ManagementL90 Line Differential RelayCurrent Differential SchemeSimilar to a Percentage Restraint SchemeAdaptive Statistical RestraintAdaptive Based on Relay MeasurementsMore Accurate and Sensitive Fault SensingDetects High Impedance Single Line to GroundFaults that Existing Systems may not DetectThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
37gGE Power ManagementL90 Line Differential RelayNew & Unique ConceptsThree key technical considerations in designing a new current differential relay:Data ConsolidationRestraint CharacteristicSampling SynchronizationThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
38g Data Consolidation GE Power Management L90 Line Differential RelayData ConsolidationExtract appropriate parameters to be transmitted from raw samples of transmission line currentsBalance between transient response and bandwidthPhase consolidation:Phase current information is combinedFaulted phase information is lostL90 does not use phase consolidationTime consolidation:Reduces communication bandwidth requirementsImproves security caused by single corrupted data sampleL90 uses time consolidationThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
39g Phaselets Concept GE Power Management L90 Line Differential Relay 12345678910111213141516Full Cycle Window= 8 PhaseletsPhaselet( 1/8 cycle)Disturbance Detector50DDThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
40Phaselets Concept - Prefault gGE Power ManagementL90 Line Differential RelayPhaselets Concept - Prefault+X-X+R1st Pre-Fault Phaselet:Disturbance Detector resetscalculation window.Area ofuncertainty+X-X+R+X-X+RThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.-X+R+XFull CyclePre-Fault Phasor(No uncertainty)Phaselet 1Phaselet 4Phaselet 6Phaselet 8
41Phaselets Concept - Fault gGE Power ManagementL90 Line Differential RelayPhaselets Concept - Fault-X+R+X1st Fault Phaselet:Disturbance Detector resetscalculation window.+X-X+R+X-X+RPhaselet 9The user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.-X+R+XFull CycleFault Phasor(No uncertainty)Phaselet 12Phaselet 14Phaselet 16
42Phaselets Concept - Fault gGE Power ManagementL90 Line Differential RelayPhaselets Concept - FaultPhaselet Simulation on ‘Noisy’ WaveformSinusoid with random white Gaussian noise.The user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
43Phaselets Concept - Fault gGE Power ManagementL90 Line Differential RelayPhaselets Concept - FaultPhaselet Simulation on ‘Noisy’ WaveformConvergenceof uncertainty areato equivalent of full cycleFourier Transform.The user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.Decreasing‘area of uncertainty’(or variance error) asphaslet window sizeincreases.Phaselets improve operating speed while maintaining security.
44Restraint Characteristic gGE Power ManagementL90 Line Differential RelayRestraint CharacteristicClassic Dual-Slope Restraint CharacteristicIoperate = Iop = | I1 + I2 |Irestraint = Ir = K [ |I1| + |I2|]IoperateIrestraintK1K2ProtectedElementThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.I1I2Iop = | I1 + I2 |
45Restraint Characteristic gGE Power ManagementL90 Line Differential RelayRestraint CharacteristicL90 combines the classic method with adaptive elliptical restraint to improve both security and dependability.Classic Dual-slope Characteristic L90 - Adaptive Elliptical RestraintImStatic restraint region formed by classic methodImReIopIrIopReThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.Dynamic restraint region based on magnitude of the variance error measurement (i.e. the difference between the actual values measured and the estimated data from the Fourier Transform calculation)When the waveform is distorted due to CT saturation, harmonic content, or fault initiation transients, the restraint region will grow larger.
46Sampling Synchronization GE Power ManagementL90 Line Differential RelaySampling SynchronizationL90 uses distributed clock synchronizationClocks are synchronized to each other (no master clock)Phases are synchronized to each otherPrimary source is current measurementsSecondary source is time tagged messages (ping-pong)Timing error is driven to zeroPhase angle deviations are minimized (<0.6 degree)Clocks are synchronized to the power system frequencyEliminates one source of error in phasor measurementsLoop filter adjusts clock frequencyUses frequency and phase angle deviationThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
47Sampling Synchronization “Ping-Pong” Synchronization Technique: GE Power ManagementL90 Line Differential RelaySampling SynchronizationCurrent differential requires both relays to be in time synchronization for differential calculations.TxRxRxTxL90#1L90#2“Ping-Pong” Synchronization Technique:tf = forward travel timet0CommunicationsChanneltftf = tr = t3 - t0 - (t2 - t1)2The user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.t1t2Traditional “Ping-Pong” synchronization technique assumes forward time delay (tf) is equal to the return travel time (tr). This is NOT the case for communications equipment found in the utility/industrial environment.tr = return travel timetrt3
48Sampling Synchronization GE Power ManagementL90 Line Differential RelaySampling SynchronizationL90 Improvements on “Ping-Pong” Synchronization scheme:Minimizes variance on channel delays and jitter by averaging“Ping-Pong” calculationsImplements a DPLL (digital phase-locked-loop) allowing thePing-Pong algorithm to stabilize to new path delays.Calculates phase error at each end due to channel delays andcompensates clocks at both endsThe user has a choice of any one of the above curves or curve multipliers to provide the desired TOC protection function.
49g Flexibility GE Power Management Relay Channels FlexCurvesTM L90 Line Differential RelayFlexibilityRelay ChannelsFlexCurvesTMFlexLogicTMFlexModulesTMMetering and MonitoringThe F-30’s flexibility will allow the user to better utilize their existing facilities by optimizing protections schemes through FlexCurvesÔ, FlexLogicÔ and high speed communications.
50g Relay Channels GE Power Management L90 Line Differential RelayRelay ChannelsTwo Terminal Communication Channels820 nm Multi-mode Fiber (LED)1300 nm Multi-mode Fiber (LED)1300 nm Single-mode Fiber (ELED)1300 nm Single-mode Fiber (Laser)G.703 (April 99)RS422 (April 99)The F-30’s flexibility will allow the user to better utilize their existing facilities by optimizing protections schemes through FlexCurvesÔ, FlexLogicÔ and high speed communications.Three Terminal Available in April ‘99
51g FlexCurves GE Power Management Typical application of FlexCurves: L90 Line Differential RelayFlexCurvesTypical application of FlexCurves:When the protection curves used for lateral taps 2 and 3 differ; custom FlexCurves can be constructed to coordinate with both.The user can create downloadable curve shapes described by the user themselves. The user can design FlexCurvesÔ to coordinate with multiple devices containing unusual curve shapes to best fit the users specific needs. Such applications include F-30’s used with fusses or F-30’s used in combinations of fuses with other standard time overcurrent relays.
52g Monitoring GE Power Management Fault Location L90 Line Differential RelayMonitoringFault LocationIRIG-B Time SynchronizationCT Failure/Current UnbalanceTrip Circuit MonitorsChannel MonitorTest FeaturesLocal loopback for channelManual test modePlayback of oscillography filesThe F-30’s flexibility will allow the user to better utilize their existing facilities by optimizing protections schemes through FlexCurvesÔ, FlexLogicÔ and high speed communications.
53g User Interfaces GE Power Management L90 Line Differential Relay PROTECTIVE COVERProtects keypad when not in useCan be fitted with a sealRESET KEYClears event, EVENT CAUSE LEDindicators, and latched alarms
54g User Interfaces GE Power Management L90 Line Differential Relay STATUS INDICATORSIN SERVICE: The relay is operating normallyTROUBLE: Self-test detected a problemTEST MODE: The relay is in test modeTRIP: A trip command had been issuedALARM: An alarm condition is presentPICKUP: Pickup condition detectedRS232 SERIAL PORTConnect to a PC to run URPCUse for downloading settings, monitoring data, sequence of events reports, Oscillography
55g User Interfaces GE Power Management L90 Line Differential Relay EVENT CAUSE LED INDICATORSVOLTAGE: Event caused by voltageCURRENT: Event caused by currentFREQUENCY: Not applicableOTHER: Not applicablePHASE A Indicates whichPHASE B phase wasPHASE C involvedNEUTRAL/GROUNDRS232 SERIAL PORTConnect to a PC to run URPCUse for downloading settings, monitoring data, sequence of events reports, Oscillography
56g User Interfaces GE Power Management GE POWER MANAGEMENT RELAY L90 Line Differential RelayUser InterfacesGE POWER MANAGEMENTRELAYMENUHELPESCAPEENTERMESSAGEVALUEDISPLAY40 character vacuum fluorescent displayVisible in dim lighting or at any angleUsed for programming, monitoring, status,fault diagnosis, user programmablemessages and settingsKEYPADNumerical keypad and command keysallow full access to the relayRubber keypad is dust tight andsplash-proof with doorWebsite address via HELP for technicalsupport
57g User Interfaces GE Power Management L90 Line Differential Relay CONTACT INPUTS (Expandable)Configurable inputs may be used for:Breaker statusOscillography triggerControl inputsCONTACT OUTPUTS (Expandable)Trip rated Form-A relaysForm-C relays that may be programmed forauxiliary functions
58g User Interfaces GE Power Management L90 Line Differential Relay COMMUNICATIONSModBus® RTU on 115 kbpsMMS/UCA 2.0 on Redundant 10BaseFPROGRAM UPDATINGFlash memory storage of firmware for fieldupdating via communications port. Enablesproduct updating on-site for latest features.POWERFUL PROCESSORSNumerical data processing using a32 bit CPU and DSP for high speedcomplex task processing
59g Order Code GE Power Management L90 Line Differential Relay L90 - * H C * - F ** - H * * - L * *- N* *- S**- U**- W**Base Unit L Base UnitCPU A RS485 + RS485C RS BaseFD RS485 + Redundant 10BaseFSoftware Options No software optionsMounting H HorizontalFaceplate C Faceplate with keypad and displayPower Supply L /48 V (Low); VDC, VACH /250 V (High); VDC, VACCT/VT A Standard 4CT/4VTDigital I/O XX No module6G 4 Form-A, 8 inputs I 4 SCR outputs, 16 inputsDigital I/O 6A A A 6A 2 Form-A, 2 Form-C, 8 inputs6B B B 6B 2 Form-A, 2 Form-C, 4 inputs6C C C 6C 8 Form-C outputs6D D D 6D 16 Inputs6E E E 6E 4 Form-C, 8 inputs6F F F 6F 4 Form-A, 8 inputs6G G G 6G 8 Fast Form-C outputs6H H H 6H 4 Form-A, 8 inputs6I I I 6I 6 Form-A, 4 inputs6J J J 6J 4 SS SCR outputs, 8 inputs6K K K 6K 4 Form-C, 4 Fast Form-CInter-Relay Communications A 820 nm, multi-mode, LED, 2 Terminal7B 1300 nm, multi-mode, LED, 2 Terminal7C 1300 nm, single-mode, ELED, 2 Terminal7D 1300 nm, single-mode, LASER, 2 Terminal7R G Terminal7T RS422 2 Terminal
60g GE Power Management UR L90 Line Differential Relay An integrated transmission line protectionsystem for series compensated lines