sel 351r schweitzer

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2350 NE Hopkins Court Pullman, WA 99163-5603 USA Phone: (509) 332-1890 Fax: (509) 332-7990 E-mail: [email protected] Internet: www.selinc.com SEL-351R Recloser Control Data Sheet Data Sheet DWG. FRONT (press for 3 sec) LOCK 1 HOT LINE R PULLMAN WASHINGTON USA SCHWEITZER ENGINEERING LABORATORIES 1 4 5 2 3 SEL-351R RECLOSER CONTROL GROUP CNTRL SET EXIT 81 CURRENT HIGH PORT F SERIAL 9 OTHER EVENTS STATUS TRIP FAST SELECT PROBLEM BATTERY TAG METER RESET CANCEL TEST SUPPLY AC ENABLED CONTROL LAMP TARGET CURVE 9 8 7 6 SEF G C AUX 1 AUX 2 B LOCKOUT A CYCLE RESET CONTROL STATE GROUND RECLOSE ENABLED FAULT TYPE WAKE UP RECLOSER CLOSED ENABLED ENABLED REMOTE CLOSE SETTINGS ALTERNATE OPEN 196-0325 TRIP U.S. Patents 5,041,737 5,208,545 5,317,472 5,349,490 5,365,396, 5,479,315 5,515,227 5,602,707 5,694,281 Foreign Patents issued and other U.S. and Foreign Patents Pending RECLOSER KEY FEATURES Compatible with Standard Control Cable and Mounting Dimensions for Ease of Retrofit Tested to ANSI/IEEE C37.60 Easy Settings Up to Four Reclosures and Sequence Coordination Fast and Delay Curves for Phase and Ground Overcurrent Protection US, IEC, Programmable, and All Traditional Recloser Curves Underfrequency Load Shedding Recloser Wear Monitor, Load Profiling, Sequential Events Recorder (SER), and Event Reports Enhanced SELOGIC ® Control Equations and Six Setting Groups for Designing Custom Schemes Mirrored Bits Technology for Relay-to- Relay Digital Logic Communications Optional DNP Version 3.00 Level 2 Protocol with Point Mapping Connect True Three-Phase Voltage for: complete metering, including MWh and MVARh load encroachment logic to prevent tripping on load fault location and directional overcurrent elements high-side blown fuse detection Connect Extra Voltage Channel for Synchronism-Check and Line Voltage Check Control and Low Voltage Close Cables Available from SEL.

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SEL 351R Schweitzer

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  • 2350 NE Hopkins Court

    Pullman, WA

    99163-5603

    USA

    Phone: (509) 332-1890

    Fax: (509) 332-7990

    E-mail: [email protected]

    Internet: www.selinc.com

    SEL-351R Recloser Control

    Data SheetData Sheet

    DWG. FRONT

    (press for 3 sec)LOCK

    1

    HOT LINE

    RPULLMAN WASHINGTON USASCHWEITZER ENGINEERING LABORATORIES

    145 23

    SEL-351R RECLOSER CONTROL

    GROUPC N T R LSET

    EXIT

    81C U R R E N THIGH

    PORT FSERIAL

    9

    O T H E REVENTS STATUS

    TRIPFAST

    SELECT

    PROBLEMBAT T ERY

    TAG

    METERRESET

    CANCELT E S T

    SUPPLYAC

    ENABLEDC O N T R O L

    LAMP

    T A R G E T

    CURVE

    9 8 7 6

    SEFGC

    AUX 1

    AUX 2

    BL O C K O U T ACYCLERESET

    CONTROL STATE

    GROUND

    RECLOSE

    ENABLED

    FAULT TYPE

    WAKE UP

    RECLOSERCLOSED

    ENABLED

    ENABLEDR E M O T E

    C L O S ESETTINGSALTERNATE

    OPEN

    196-0325

    TRIP

    U.S. Patents 5,041,737 5,208,545 5,317,472 5,349,490 5,365,396, 5,479,315 5,515,227 5,602,707 5,694,281Foreign Patents issued and other U.S. and Foreign Patents Pending

    RECLOSER

    KEY FEATURES Compatible with Standard Control

    Cable and Mounting Dimensions forEase of Retrofit

    Tested to ANSI/IEEE C37.60

    Easy Settings

    Up to Four Reclosures and SequenceCoordination

    Fast and Delay Curves for Phase andGround Overcurrent Protection

    US, IEC, Programmable, and AllTraditional Recloser Curves

    Underfrequency Load Shedding

    Recloser Wear Monitor, Load Profiling,Sequential Events Recorder (SER), andEvent Reports

    Enhanced SELOGIC Control Equationsand Six Setting Groups for DesigningCustom Schemes

    Mirrored Bits Technology for Relay-to-Relay Digital Logic Communications

    Optional DNP Version 3.00 Level 2 Protocol with Point Mapping

    Connect True Three-Phase Voltage for:

    complete metering, including MWh and MVARh load encroachment logic to prevent tripping on load fault location and directional overcurrent elements high-side blown fuse detection

    Connect Extra Voltage Channel for Synchronism-Check and Line Voltage Check

    Control and Low VoltageClose Cables Available

    from SEL.

  • 2INSTALLATION OVERVIEW AND EXAMPLE APPLICATIONS

    NEW CAPABILITIES AVAILABLE WHEN TRADITIONAL INSTALLATIONS ARERETROFITTED

    Figure 1 shows an SEL-351R retrofitted into a traditional installation, where single-phase 120Vac power is the only voltage brought to the control. Even this installation has the first elevenbulleted key features listed on the front cover. One of these key features, underfrequency loadshedding, is illustrated in Figure 2.

    (a lso connectedto voltage VAfor f requency

    moni tor ing- see Figure 7) Dwg. l inedia1

    120 VacPower

    120 Vac Close Power(i f recloser is equipped)

    Tr ip and CloseRecloser StatusIA , IB , I C , IN

    Contro l Cable

    LoadSource

    C

    B

    A

    RECLOSER

    SEL-351R

    24 Vdc

    Figure 1: Retrofit Traditional Installation With SEL-351R Recloser Control

    The feeder in Figure 2 would traditionally be the last to trip for underfrequency load sheddingbecause it serves critical fire department and hospital loads. By retrofitting recloser controlinstallations on various taps with SEL-351Rs, the feeder can now contribute first tounderfrequency load shedding at the tap level. The SEL-351Rs on the residential load taps areset to trip first for underfrequency load shedding, without interrupting service to the critical firedepartment and hospital loads.

    Resident ia l

    Resident ia l

    Substat ion

    SEL-351R

    Fire Depar tmentand Hospi ta l

    1

    SEL-351R

    1

    SEL-351R

    1

    Figure 2: Implement Underfrequency Load Shedding at the Tap Level with SEL-351RRecloser Controls

  • 3FULL CAPABILITIES AVAILABLE WHEN ALL VOLTAGES ARE CONNECTEDWhen true three-phase voltage and synchronism-check voltage are connected to the SEL-351R asshown in Figure 3, the additional key features listed at the bottom of the front cover are gained.This allows for more sophisticated control schemes as illustrated in Figure 4.

    120 VacPower

    120 Vac Close Power(i f recloser is equipped)

    Tr ip and CloseRecloser StatusIA, IB , IC , IN

    Control Cable

    SEL-351R

    Connect to extra vol tagechannel VS for synchronism-check and l ine vol tagecheck (channel VSconnected to phase A in th isexample)

    Dwg. lnd iag24 Vdc3-Phase Vol tage(connect to vol tage

    channels VA, VB, and VC)

    LoadSource

    C

    B

    A

    RECLOSER

    Figure 3: Connect True Three-Phase and Synchronism-Check Voltages to SEL-351RRecloser Control

    The load in Figure 4 can be served from either recloser 1 or recloser 2. The respectiveSEL-351R knows the state of source- and load-side voltages. The controls communicate viafiber-optic cable to determine whether the load should be quickly transferred to the other sourcein the event of an outage. This communication is reliably and economically accomplished withMirrored Bits technology and SEL-2815 Fiber-Optic Transceivers. If the power system islooped, the SEL-351Rs also have directional overcurrent elements for reliable, secure tripping.

    TXRX

    SEL-2815

    SEL-351R

    DWG: DS351R04Load

    2

    31

    Fiber-Opt ic Cable

    3 1

    SEL-351R

    SEL-2815

    Source Source

    TXRX

    1

    Figure 4: Improve Service Reliability for Load With Two SEL-351R Recloser ControlsCommunicating Over Fiber-Optic Cable

  • 4HARDWARE OVERVIEW

    Contro l CableReceptac le 7/8" and 1-3/8"

    Knockouts

    TerminalB lock

    Bat tery Fence

    Batter ies

    NEMA Type 3R(IP32) Enclosure

    Relay Module

    120 Vac (GFCI)Convenience Out le t

    D W G : M 3 5 1 R 0 3 8

    SidePanel

    Figure 5: SEL-351R Recloser Control Enclosure With Swing Panel Open

    Figure 6: SEL-351R Recloser Control Relay Module Side Panel

  • 5INSIDE THE ENCLOSURE

    B

    Radio

    SEL-351R Recloser Contro l(not including front panel)

    7 OutputContacts /1 A L A R M

    EIA-485EIA-232EIA-232

    VV A

    V C

    V S

    IA, IB, IC, IN

    Recloser StatusTr ip and Close

    S C A D Aor

    OtherControl

    ControlCable

    +

    EIA-232(Wake Up)

    120 VacPower

    24 VdcLead-Acid

    Battery

    6 Opto isolatedInputs

    dwg: insidej

    (synch-check)

    (a lso moni tors

    to Radio

    Power In

    BatteryMonitor/Charger

    TerminalBlock

    12 Vdc Out

    f requency)OrderingOption

    OrderingOption

    ClosePower(if recloser

    is equipped)PowerSupply

    24 Vdc

    PowerSupply

    Control

    PowerSupply

    12 Vdc

    (if installed)

    ToConvenience

    Outlet

    24 Vdc Out

    Figure 7: Connections Inside the SEL-351R Recloser Control Enclosure

    Comments on the connections in Figure 7:

    The control cable from the recloser attaches at the bottom of the SEL-351R enclosure to astandard receptacle. The wiring from this receptacle continues into the control itself, withthe currents landing on the terminal block to connect channel IN residually with phase currentchannels IA, IB, and IC.

    The 120 Vac power is paralleled to voltage channel VA, as discussed in the retrofit of atraditional installation in Figure 1. If the SEL-351R is ordered with additional voltagechannels VB, VC, and VS, then true three-phase voltage and synchronism check voltage canbe connected, as discussed in Figure 3. The terminal block is used to make these voltageconnections.

    Battery charging/discharging is made through the internal battery monitor/charger. Thisallows the control to keep track of battery capacity. Knowing battery capacity, the controlcan put itself to sleep if capacity reaches a user-set threshold after an extended outage.

    The figure proposes the idea of connecting a radio to communicate with the SEL-351R. TheEIA-232 wake-up ports only function is to receive a specific message to wake up the controlif it has been put to sleep to conserve battery energy during an extended outage (and 120 Vacpower has not yet been restored). Communication takes place with the other paralleled EIA-232 port after the unit wakes up.

  • 6FRONT-PANEL INTERFACE

    DWG. FRNTCALL-1

    (press for 3 sec)LOCK

    1

    HOT LINE

    RPULLMAN WASHINGTON USASCHWEITZER ENGINEERING LABORATORIES

    145 23

    SEL-351R RECLOSER CONTROL

    GROUPCNTRLSET

    EXIT

    81CURRENTHIGH

    PORT FSERIAL

    9

    OTHEREVENTS STATUS

    TRIPFAST

    SELECT

    PROBLEMBATTERY

    TAG

    METERRESET

    CANCELTEST

    SUPPLYAC

    ENABLEDCONTROL

    LAMP

    TARGET

    CURVE

    9 8 7 6

    SEFGC

    AUX 1

    AUX 2

    BLOCKOUT ACYCLERESET

    CONTROL STATE

    GROUND

    RECLOSE

    ENABLED

    FAULT TYPE

    WAKE UP

    RECLOSERCLOSED

    ENABLED

    ENABLEDREMOTE

    CLOSESETTINGSALTERNATE

    OPEN

    1 9 6 - 0 3 2 5

    TRIP

    U.S. Patents 5,041,737 5,208,545 5,317,472 5,349,490 5,365,396, 5,479,315 5,515,227 5,602,707 5,694,281Foreign Patents issued and other U.S. and Foreign Patents Pending

    RECLOSER

    Status and TripTarget LEDs

    Pushbut tons

    Operator Controls

    Ample spacing al lowsfor protective glove

    operation of al l basicrecloser control

    function (note thecorresponding status

    LED just to the right ofeach operator control,

    except WAKE UP).

    Display2 x 16 l iquid

    crystal display (LCD)

    1

    2

    3

    See noted safety features forCLOSE and TRIP operatorcontrols in Table 1.

    Figure 8: SEL-351 Recloser Control Front-Panel Interface

  • 7Table 1: Front-Panel Interface Definitions (see Figure 8)

    The pushbuttons (except TARGET RESET/LAMP TEST) have dual functions (primary/secondary).After a primary function is selected (i.e., METER pushbutton), the pushbuttons then revert tooperating on their secondary functions (CANCEL, SELECT, left/right arrows, up/down arrows,EXIT) so the user can scroll through information, activate settings/control, etc. on the LCD.

    CONTROL ENABLED* SEL-351R Recloser Control is enabled.AC SUPPLY 120 Vac power is present.BATTERY PROBLEM Indicates any of the following battery problems:

    - discharge test failure- disconnected- cannot be charged- monitor/charger failure

    HOT LINE TAG No closing or auto-reclosing can take place via the control.TRIP Indication that a trip occurred by an overcurrent element,

    underfrequency element, or otherwise.FAST CURVE Fast curve overcurrent element trip.HIGH CURRENT High-set overcurrent element trip.81 Underfrequency trip.RESET The control is in the Reset State, ready for a reclose cycle.CYCLE The control is actively in the trip/reclose cycle mode.LOCKOUT All reclose attempts were unsuccessful, so the control goes to the

    lockout state.A, B, C* Phases A, B, or C involved in fault.G Ground involved in fault.SEF Sensitive earth fault overcurrent element trip.

    GROUND ENABLED Enables/Disables ground overcurrent elements.RECLOSE ENABLED Enables/Disables auto-reclosing.REMOTE ENABLED Enables/Disables remote control.ALTERNATESETTINGS

    Switches active setting group between main and alternate settinggroups.

    LOCK(press for 3 sec)

    Blocks the function of other operator controls (except WAKE UPand TRIP). 3 second delay to engage/disengage.

    AUX 1 User programmable; e.g., program to Trip Test - to test auto-recloselogic without applying current.

    AUX 2 User programmable; e.g., program to Enable/Disable fast curvetripping.

    WAKE UP* Wakes up the control after it has been put to sleep.CLOSE/RECLOSER CLOSED

    Close recloser/recloser closed status.Note: The CLOSE operator control can be set with a delay, allowingthe operator to press CLOSE and then move away a safe distancefrom the recloser before closing proceeds.

    TRIP/RECLOSER OPEN

    Trip recloser (go to lockout)/recloser open status.Note: The TRIP operator control can be set with a delay, allowingthe operator to press TRIP and then move a safe distance from therecloser before tripping proceeds.

    * These indicated LEDs and operator control have fixed functions. All the other LEDs and operatorcontrols (with corresponding status LEDs) can change function by programming at a higher logic level.

  • 8COMMUNICATIONS

    Front Panel

    SEL-2020

    SEL-351R (#2)SEL-351R (#1)

    SEL-351R (#1)

    Computer

    PORT 2

    (METALLIC)Cable #C273A

    SEL-351R

    SEL-351R SEL-351R

    SEL-2020Communicat ions

    Processor

    SEL-351R (#2) SEL-351R (#32)

    DATA AND T IME-SYNCHRONIZATION* CONNECTIONS

    SEL-2020Communicat ions

    Processor

    PORT 2

    Fiber-Optic Cable#C273AFZ

    or #C273AF0 SEL-2810

    Optical Cable ConnectionMetal l ic Cable Connection

    EIA-485 CONNECTIONS ( i f ordered wi th EIA-485 por t )

    PORT 1 PORT 1 PORT 1

    LOCAL CONNECTIONSC O N N E C T T O THE SEL-2020O N C E A N D COMMUNICATE W I T HANY C O N N E C T E D SEL RELAY O RR ECLOSER CONT ROL

    PORT 2 Side Panel

    PORT F Front Panel

    O R . . .C O N N E C T T O THE SEL-351RR ECLOSER CONT ROLINDIVIDUALLY VIA THE FR O N T-P ANEL SERIAL PO R T

    DWG: M351R050

    * Demodulated IRIG-B t ime code can be input into the connector for ei ther ser ial port 1 orserial port 2, but not both at the same t ime.

    PORT 2 Side Panel

    PORT F Front Panel

    Cable#C234A

    Figure 9: SEL-351R Recloser Control Communications Connections Examples

  • 9Operator Controls and Serial Communications

    The SEL-351R is equipped with three EIA-232 serial ports (one on the front panel and two onthe side panel) and as an option one isolated EIA-485 serial port (on the side panel). Each serialport operates independently of the other serial ports. The serial ports provide full access to eventhistory, recloser control status, and meter information. Multi-level password access providessecurity for control and setting operations. Several communication methods are supported:

    Simple ASCII - Plain-language commands for human and simplemachine communications.

    - Use for metering, setting, self-test status, eventreporting, and other functions.

    Compressed ASCII - Comma-delimited ASCII data reports. Allows anexternal device to obtain control data in a formatwhich directly imports into a spreadsheet ordatabase program. Data are checksum protected.

    Extended Fast Meter - Binary protocol for machine-to-machinecommunications. Quickly updates the SEL-2020,RTU, and other substation devices with meteringinformation, relay element, input and outputstatus, time-tags, open and close commands, andsummary event reports. Data are checksumprotected.

    - Binary and ASCII protocol operatesimultaneously over the same communicationslines such that control operator meteringinformation is not lost while a technician istransferring an event report.

    Distributed Port SwitchProtocol (LMD)

    - Enables multiple SEL devices to share a commoncommunications network using a two-characteraddress from 01 to 99. LMD is appropriate forlow-cost, low-speed port-switching applicationswhere updating a real-time database is not arequirement.

    DNP V3.0 Level 2 - Distributed Network Protocol Version 3.00Level 2 slave implementation is available. TheSEL-351R provides point mapping to allowcustom DNP mapping for the application.

    The SEL-351R does not require special communications software. Dumb terminals, printingterminals, or a computer supplied with terminal emulation and a serial communications port is allthat is required.

  • 10

    FEATURES AND BENEFITS

    SEL-351R RECLOSER CONTROL DERIVED FROM THE SEL-351 RELAYThe SEL-351R Recloser Control is derived from SELs premiere distribution relay: the SEL-351Relay. The primary differences between the SEL-351R and the SEL-351 Relay are:

    The three single-phase time-overcurrent elements of the SEL-351 Relay (51AT, 51BT,51CT) are converted to extra phase, neutral ground, and residual ground time-overcurrent elements (51P2T, 51N2T, and 51G2T, respectively) in the SEL-351R.These extra time-overcurrent elements provide fast and delay curve tripping for phaseand ground overcurrent protection.

    The SEL-351R has front-panel operator controls (see bottom of Figure 8 and Table 1).These operator controls and corresponding status LEDs eliminate separate panel controlswitches and lights.

    EASY TO SET THE SEL-351R RECLOSER CONTROLThe SEL-351R is easy to set - only settings such as minimum trip pickup, curve type, and recloseinterval have to be made. These settings are made at an EZ (easy) access level. The SELOGICControl Equations cannot be changed at this access level.

    The control logic is preconfigured at the factory. If the user wants to customize the logic, theSELOGIC Control Equations can be reprogrammed at a higher logic level.

    TRADITIONAL RECLOSER CONTROL FEATURES AVAILABLE IN THE SEL-351RRECLOSER CONTROL

    Reclosing

    The SEL-351R can reclose up to four (4) times. This allows for up to five operations of anycombination of fast and delay curve overcurrent elements. Each reclose interval can be set up to999,999 cycles (over 4.5 hours) if desired.After a reclose interval has timed out, the control waits for a user-set time (close power waittime) for the 120 Vac power to come hot before proceeding with the auto-reclose. The recloserneeds either primary or secondary (120 Vac) voltage to provide the closing power, depending onhow the recloser is equipped. The 120 Vac power into the SEL-351R is an indication of thepresence of this primary or secondary voltage. The close power wait time has the same 999,999cycle setting range.

    The reset times are separately set for reset timing for an auto-reclose and reset timing for amanual/remote close from lockout. Traditionally, the reset time for a manual/remote close fromlockout is set less than the reset time for an auto-reclose. The reset times have the same 999,999cycle setting range.

  • 11

    Front-panel LEDs track the control state for auto-reclosing: RESET, CYCLE, or LOCKOUT(see Figure 8 and Table 1).Sequence coordination logic is enabled to prevent the SEL-351R from tripping on its fast curvesfor faults beyond a downstream recloser.

    If the user wants to customize the reclosing logic, the corresponding SELOGIC Control Equationscan be reprogrammed at a higher logic level.

    Overcurrent Protection

    Fast and Delay Curves

    Fast and delay curves are available for phase and ground overcurrent protection. For a nominalrecloser ct ratio of 1000:1, these curves can be set as sensitive as 100 A and 5 A primary forphase and ground overcurrent protection, respectively. These fast and delay curves can be set forany combination of operations, up to five as described in the preceding reclosing subsection (e.g.,two fast curve operations, followed by two delay curve operations).These curves can be set with numerous curve choices, including user-designed curves. Thechoices resident in the SEL-351R are listed in Table 2.

    Table 2: Curve Choices Resident in the SEL-351R Recloser Control

    Curve Type Curve Choices

    All TraditionalRecloser Curves

    A, B, C, D, E, F, G, H, J, KP, L, M, N, P, R, T, V,W, Y, Z, 1, 2, 3, 4, 5, 6, 7, 8, 8PLUS, 9, KG, 11,13, 14, 15, 16, 17, 18

    US Curves moderately inverse, inverse, very inverse,extremely inverse, short-time inverse

    IEC Curves class A (standard inverse), class B (very inverse),class C (extremely inverse), long-time inverse,short-time inverse

    Programmable Curves(User-Designed)

    Four (4) Programmable Curves

    Any fast or delay curve (phase or ground) can be set with any of the curves in Table 2. The USand IEC curves conform to IEEE C37.112-1996 IEEE Standard Inverse-Time CharacteristicEquations for Overcurrent Relays.

    The traditional recloser curve choices in Table 2 are listed using the older electronic controldesignations. The traditional recloser curves can also be specified in a curve setting using thenewer microprocessor-based control designations - the SEL-351R works with either designation.For example, a given traditional recloser curve has the following two designations:

    Older electronic control designation: A

    Newer microprocessor-based control designation: 101

    Traditional recloser curve A and 101 are the same curve - use either designation in making curvesettings in the SEL-351R.

  • 12

    Four (4) user-designed curves (created with a software package) can be downloaded to the SEL-351R. The fast and delay curves (phase or ground) can be set with the user-designed curves orthe curve choices in Table 2.

    Fast and delay curves (including US or IEC curve choices) can be modified with traditionalrecloser control curve modifiers:

    constant time adder - adds time to curve vertical multiplier (time dial) - shifts whole curve up or down in time minimum response time - holds off curve tripping for minimum time high current trip - instantaneous trip with optional time delay high current lockout - high-set lockout threshold

    Fast and delay curves using US or IEC curve choices from Table 2 can be set withelectromechanical induction-disc emulation reset if desired. This feature is useful in situationswhere the relay to the source-side of the SEL-351R is an electromechanical relay.

    For example, for a fault to the load-side of the SEL-351R, the source-side electromechanicalrelay also times. When the recloser interrupts the fault, the source-side electromechanical relaystarts to reset. If the fast or delay curve reset emulates an electromechanical relay, then source-side electromechanical relay and the SEL-351R reset in tandem. When the recloser is auto-reclosed back into the fault - the fast or slow curve of the SEL-351R starts to time from where itis, if not yet fully reset. This keeps the source-side electromechanical relay from ratcheting totrip for repetitive reclosures by the SEL-351R into the load-side fault.

    Front-panel target LEDs indicate any overcurrent trip in general (TRIP LED) and thendiscriminate a fast curve trip (FAST CURVE LED) or a high current trip (HIGH CURRENT).See Figure 8 and Table 1.

    Sensitive Earth Fault (SEF) ElementA sensitive earth fault (SEF) element with time delay (up to 16,000 cycles) can be set as sensitiveas 5 A primary (assuming nominal recloser ct ratio of 1000:1). Current channel IN with a 0.05 Asecondary nominal rating provides this sensitivity (see Figure 7 and accompanying notes).Front-panel target LEDs indicate any SEF element trip with the SEF LED (see Figure 8 andTable 1).

    Custom Overcurrent Protection

    If the user wants to customize the overcurrent protection, the corresponding SELOGIC ControlEquations can be reprogrammed at a higher logic level.

  • 13

    Recloser Wear Monitor Feature = Intelligent Recloser Maintenance Scheduling

    Reclosers experiencemechanical and electricalwear every time they operate.The recloser wear monitorfeature measures unfiltered accurrent at the time of trip andthe number of close-to-openoperations as a means ofmonitoring this wear.

    Every time the recloser trips,the relay records themagnitude of the raw currentin each phase. This currentinformation is integrated on aper phase basis. Figure 10: Recloser Contact Wear Curve and Settings

    When the result of this integration exceeds the threshold set by the recloser wear curve, theSEL-351R asserts a logic point for the affected phase. This logic point can be routed foralarming or to modify reclosing (e.g., shorten the number of reclosures). This method ofmonitoring recloser wear is solidly based on methods of breaker rating from breaker manufacturers.

    Figure 10 shows three setpoints needed to emulate a breaker wear curve. These setpoints are setautomatically by the SEL-351R, following recommendations for reclosers in ANSI C37.61-1973.Only the recloser type (oil or vacuum) and the interrupt rating have to be entered.If the user wants to customize the recloser wear curve, the setpoints in Figure 10 can beprogrammed at a higher logic level.

    Intelligent Battery Monitor/Charger

    Refer to the Figure 7.

    When 120 Vac power is interrupted, 24-volt, 8.0 Amp-hour sealed lead-acid batteries supplypower to the SEL-351R. The temperature-compensated battery monitor/ charger monitorsbattery capacity, measures power supply load current, and calculates expected battery run time.A fully charged 8.0 Amp-hour battery supplies the trip and control power for 10 to 24 hoursdepending on ambient temperature and load.

    After battery capacity discharges to a user-set threshold, the SEL-351R puts itself to sleep. The12 Vdc can be kept on to power a radio during the sleep mode.

    The SEL-351R can be programmed to issue a trip to sectionalize the dead line before going tosleep. When power is restored, the system can then be restored section by section.

    The recloser control wakes up if any of the following occur:

    120 Vac power is restored a specific message is received by the EIA-232 wake-up port (see Figure 7) the WAKE UP operator control is pressed (see Figure 8)

  • 14

    The control reports battery health in the diagnostic self-test status reports. Regardless of batteryhealth, the SEL-351R can trip and close the recloser from the 120 Vac power.

    Load Profile

    The SEL-351R logs up to 15 user-selected values into the load profile buffer. These values canbe virtually any analog value (e.g., current, demand current, voltage, MW, MVAR, MWh,MVARh). Set the data logging interval from 5 to 60 minutes. The SEL-351R stores up to 40days of data for a load profile of 15 values logged every 15 minutes.

    Note: With a single phase voltage connection, no power or energy values are available.

    Event Reporting and SER

    Event reports are automatically triggered at fault inception and when the SEL-351R issues a trip.Event report length is selectable: 15 or 30 cycles. The current, voltage, frequency, and elementstatus information contained in each report confirms performance of the control, scheme, andsystem for every fault. The latest twenty-eight 15-cycle event reports (or fourteen 30-cycle longevent reports) are stored in nonvolatile memory. Decide how much detail is necessary when yourequest an event report: 1/4-sample/cycle or 1/16-sample/cycle filtered or unfiltered analog data.

    The control adds lines in the sequential events recorder (SER) report for a change of state ofprogrammed conditions. The control stores the latest 512 lines of the SER report in nonvolatilememory. Use SER reports to gain a broad perspective of system performance at a glance -especially an auto-reclosing sequence.

    Event reports and SER reports are date- and time-stamped. The IRIG-B time-code inputsynchronizes the SEL-351R time to within 5 ms of the time-source input. A convenient sourcefor this time code is the SEL-2020 or SEL-2030 Communications Processor (see Figure 9).

    Remote Control

    Remote control of the SEL-351R can be accomplished via the:

    serial ports optoisolated inputs/output contacts connected to SCADA (see Figure 7)

    The user can customize the remote control (and its hierarchy with front-panel operator control -see bottom of Figure 8) by programming SELOGIC Control Equations at a higher logic level.

    NEW FEATURES AVAILABLE WITH THE SEL-351R RECLOSER CONTROLFigure 1 shows an SEL-351R retrofitted into a traditional installation, where single-phase 120Vac power is the only voltage brought to the control. Even this installation has the first elevenbulleted key features listed on the front cover. The new features available with the SEL-351Rare described in this subsection.

  • 15

    Underfrequency Load Shedding

    The SEL-351R underfrequency load shedding element has a pickup range of 40.10 - 65.00 Hzwith a time delay settable up to 16,000 cycles. Figure 2 gives an example application forunderfrequency load shedding.

    Front-panel target LEDs indicate any underfrequency load shedding trip with the 81 LED (seeFigure 8 and Table 1).Five (5) additional frequency elements are available in the SEL-351R. Use these extra elementsfor additional underfrequency load shedding levels (with varying time delays) or to provide afrequency window for load restoration. These extra frequency elements can be accessed at ahigher logic level.

    Relay-to-Relay Digital Communications (Mirrored Bits Technology)The SEL patented Mirrored Bits technology provides bidirectional relay-to-relay digitalcommunications. Figure 4 gives an example application for Mirrored Bits. Mirrored Bits canoperate independently on up to two EIA-232 serial ports on a single SEL-351R. With MirroredBits operable on two serial ports, there is communication upstream and downstream from theSEL-351R site.

    This bidirectional digital communication creates eight additional virtual outputs (transmittedMirrored Bits) and eight additional virtual inputs (received Mirrored Bits) for each serial portoperating in the Mirrored Bits mode. These Mirrored Bits can be used to transmit/receiveinformation in communications-aided tripping schemes (e.g., permissive overreaching transfertripping) and other control functions (e.g., cancel reclosing). Mirrored Bits also help reduce totalscheme operating time by eliminating the need to assert output contacts to transmit information.

    Enhanced SELOGIC Control Equations

    SELOGIC Control Equations provide the reserve horsepower in the SEL-351R for implementingnecessary custom protection and control schemes. All SEL-351R logic is already set at thefactory in the SELOGIC Control Equations. If the user wants to customize the logic, the SELOGICControl Equations can be reprogrammed at a higher logic level. This can be done separately foreach setting group, so a different scheme can be had in each setting group (see following multiplesetting groups discussion).Programming SELOGIC Control Equations consists of combining relay elements (e.g., voltage,overcurrent), inputs, reclosing states, etc. with SELOGIC Control Equation operators to driveoutput contacts and other settable parameters.

    The SELOGIC Control Equation operators included are:

    + OR One element on either side of a + symbol must assert before the condition is true.

    * AND Elements on both sides of the * symbol must assert before the condition is true.

    ! Invert (NOT) Inverts the value of the element immediately following the ! symbol.( ) Parentheses Enclose elements, inputs, etc., inside these parentheses to be operated on

    by the +, !, or * operators. Use these parentheses in the SELOGIC Control Equations tominimize setting entries.

  • 16

    / Rising Edge Produces a logic 1 pulse for one processing interval following a risingedge of the element immediately following the / symbol.

    \ Rising Edge Produces a logic 1 pulse for one processing interval following a fallingedge of the element immediately following the \ symbol.

    In addition to Boolean-type logic, 16 general purpose SELOGIC Control Equation timers eliminatethe need for external timers for custom protection or control schemes. Each timer hasindependent time-delay pickup and dropout settings (six timers settable up to 999,999 cycles andten timers settable up to 16,000 cycles). Program the input to a timer with any desired element(e.g., time qualify a voltage element). Assign the timer output to trip logic, reclose logic, or othercontrol scheme logic.

    Multiple Setting Groups

    The relay stores six setting groups. Switch the active setting group with the front-panel GROUPpushbutton (see Figure 8), a serial port command, or other programmable conditions (e.g., viaoptoisolated inputs). Use these setting groups to cover a wide range of protection and controlcontingencies. Selectable setting groups make the SEL-351R ideal for applications requiringfrequent setting changes and for adapting the protection to changing system conditions.

    When the active setting group is switched, the settings (e.g., overcurrent and reclosing) as well asthe logic (implemented in SELOGIC Control Equations) is switched, too. Setting groups can beprogrammed for different operating conditions, such as feeder paralleling, station maintenance,seasonal operations, emergency contingencies, loading, source changes, and downstream reclosersetting changes.

    Use the ALTERNATE SETTINGS operator control (see Figure 8) to switch the active settinggroup between setting group 1 (main setting group) and setting group 2 (alternate setting group).Switching the active setting group with the front-panel GROUP pushbutton (see Figure 8) or aserial port command requires a password.

    FULL CAPABILITY AVAILABLE WHEN ALL VOLTAGES ARE CONNECTED TO THESEL-351R RECLOSER CONTROL

    When true three-phase voltage and synchronism-check voltage are connected to the SEL-351R asshown in Figure 3, the additional key features listed at the bottom of the front cover are gained.These additional, new features available with the SEL-351R are described in this subsection.

    The voltage elements, synchronism-check elements, directional overcurrent elements, loss-of-potential logic, communications-assisted trip logic, and load encroachment logic can be accessedat a higher logic level.

    Under- and Overvoltage Elements

    Many phase, phase-to-phase, and sequence undervoltage (27) and overvoltage (59) elements areavailable for application in numerous schemes:

    hot-bus/dead line or dead bus/hot line auto-reclosing control blown transformer high-side fuse detection voltage sag and swell detection (trip, alarm, or trigger event reports)

  • 17

    undervoltage (27) load shedding (use both 27 and 81U load-shedding schemes to detectsystem MVAR and MW deficient conditions, respectively) capacitor bank control

    Synchronism-Check Elements

    Besides providing under- and overvoltage elements, voltage channel VS can also be used forsynchronism-check. Voltage channel VS synchronism checks with user-selected phase VA, VB, orVC. Two synchronism-check elements are available for such applications as:

    one synchronism-check element for automatic reclosing the other synchronism-check element for manual/remote closing

    Alternatively, voltage channel VS can be connected at many other power system points (e.g.,ungrounded capacitor neutral or broken delta potential transformer connection).

    Fault Locator Reduces Line Patrol and Outage Time

    The SEL-351R accurately locates all faults, even during periods of substantial load flow. Thefault locator uses fault type, replica line impedance settings, and fault conditions to provide anaccurate estimate of fault location without communications channels, special instrumenttransformers, or prefault information.

    Complete Metering CapabilitiesExtensive and accurate metering capabilities are provided by the SEL-351R. VA,B,C and IA,B,Cmetering accuracies, and power measurement accuracies are provided in the TechnicalSpecifications section.Metered quantities include phase voltages and currents (including demand), sequence voltagesand currents, power, frequency, and energy (including demand) along with maximum/minimumlogging of selected quantities. All metered quantities are reported in primary quantities (currentin A primary and voltage in kV primary):

    Currents IA,B,C,N Input currentsIG Residual ground current (IG =3I0 = IA + IB + IC)

    Voltages VA,B,C Wye-connected voltage inputsVS Synch-check voltage input

    Power MWA,B,C Single-phase megawattsMW3P Three-phase megawattsMVARA,B,C Single-phase megavarsMVAR3P Three-phase megavars

    Energy MWhA,B,C Single-phase megawatt hoursMWh3P Three-phase megawatt hoursMVARhA,B,C Single-phase megavar hoursMVARh3P Three-phase megavar hours

    Power Factor PFA,B,C,3P Single- and three-phase power factor; leading orlagging

    Sequence I1, 3I2, 3I0 Positive-, negative-, and zero-sequence currents

  • 18

    V1, V2, 3V0 Positive-, negative-, and zero-sequence voltages

    Frequency FREQ (Hz) Instantaneous power system frequency (monitoredon channel VA)

    If true three-phase voltage is not connected, the voltage (VA,B,C), MW/MVAR, MWh/MVARh,and power factor metering values are not available.

    Directional Overcurrent Elements

    Phase and ground directional elements are standard features of the SEL-351R. The SEL-351Rincludes Best Choice Ground Directional Logic, which, if enabled, selects the best grounddirectional element for the system conditions.

    Phase directional elements provide directional control of phase and negative-sequenceovercurrent elements. The phase overcurrent elements may be controlled by positive-sequencevoltage-polarized and negative-sequence voltage-polarized directional elements, which worktogether. The positive-sequence voltage-polarized directional element includes over 29 cycles ofmemory. Thus, this directional element gives a reliable output even for close-in, forward- orreverse-bolted, three-phase faults where each phase voltage is zero.

    Ground directional elements provide directional control to the neutral ground and residualground overcurrent elements. Ground directional control is provided by two directional elementsworking together: a negative-sequence voltage-polarized element similar to that used in the phasedirectional element and a zero-sequence voltage-polarized directional element which uses thesame principle as the negative-sequence directional element.

    The negative-sequence directional element uses the same patented principle proven in our SEL-321 Relay. This directional element can be applied in virtually any application (regardless of theamount of negative-sequence voltage available at the relay location). The zero-sequencedirectional element is also patented.

    Loss-of-Potential Logic Validates Three-Phase Voltage Inputs

    Relay functions that use phase voltages or that use symmetrical component voltages (e.g.,metering, directional elements, fault location) rely upon valid input voltages to make the correctdecisions. The SEL-351R includes loss-of-potential logic that detects one, two, or three blownpotential fuses. This logic is unique as it does not require settings and is suited to allapplications.

    Communications-Assisted Trip Logic for Rapid Fault Clearance

    Use communication channels to improve the sensitivity, coordination, and speed of protection.Increasing in-section trip speed decreases the fault-induced voltage sag to the surroundingfeeders. The SEL-351R is the ideal solution for use in distribution feeder communications-basedtripping schemes. All schemes except DTT should include current reversal logic which requirestrue three-phase voltage connections. Schemes supported include:

    Permissive Overreaching Transfer Tripping (POTT) Directional Comparison Unblocking (DCUB) Directional Comparison Blocking (DCB) Permissive and Direct Underreaching Transfer Trip (PUTT and DUTT, respectively)

  • 19

    Direct Transfer Tripping (DTT)The communications-assisted trip logic of the SEL-351R easily handles the following:

    Current reversals Breaker open at one terminal Weak-infeed conditions at one terminal Switch-onto-fault conditions

    Time-step and time-overcurrent backup protection ensures reliable operation should the channelbe lost.

    Load Encroachment Logic

    The SEL-351R contains patented load-encroachment logic which allows phase overcurrentelements to be set securely below maximum expected load to detect end-of-line three-phasefaults in heavily loaded feeder applications.

    Figure 11: Load Encroachment Characteristics

    Load-encroachment logic usespositive-sequence load-in and load-out region elements to discriminatebetween load and fault conditions.

    When the load impedance (Z1)resides in a load region, the phaseovercurrent elements are blocked.As Figure 11 shows, when a three-phase fault occurs, Z1 moves from aload region to the line angle, and thephase overcurrent elements areunblocked.

    Load encroachment logic also controls the phase-directional element. Therefore, torque-controlling phase-overcurrent elements with the phase-directional element automaticallyincludes load encroachment torque control. External input torque control of the phase-overcurrent elements is also available.

  • 20

    TECHNICAL SPECIFICATIONS

    General Specifications

    Battery ChargerAc Voltage Input

    Input Power: 106 - 140 Vac, 120 Vac nominal.

    12 Vdc Output 11 - 14 Vdc, 6 W continuous, 13 W for 1 second.

    Ac Voltage Inputs Voltage Inputs VA, VB, VC, and VS.300 VL-N continuous (connect any voltage up to 300 Vac). 600 VL-N for 10seconds.Burden: 0.03 VA @ 67 V; 0.06 VA @ 120 V; 0.8 VA @ 300 V.

    Ac CurrentInputs

    1 A nominal: 3 A continuous, 100 A for 1 second, linear to 20 A symmetrical.250 A for 1 cycle.Burden: 0.13 VA @ 1 A, 1.31 VA @ 3 A.

    Sensitive Earth Fault:

    0.05 A nominal channel IN current input: 1.5 A continuous, 20 A for 1 second,linear to 1.5 A symmetrical.100 A for 1 cycle.Burden: 0.0004 VA @ 0.05 A, 0.36 VA @ 1.5 A.

    Frequency andRotation

    60/50 Hz system frequency and ABC/ACB phase rotation are user-settable.Frequency tracking range: 40.1 - 65 Hz (VA required for frequency tracking, butmay be supplied by control ac power source - see Figure 7).

    Output ContactsExcept Trip and

    Close

    Per IEC 255-0-20 : 1974, using the simplified method of assessment:6 A continuous carry30 A make per IEEE C37.90 : 1989100 A for one second270 Vac/360 Vdc MOV for differential surge protectionPickup/dropout time: < 5 msBreaking Capacity (L/R = 40 ms):

    24 V 0.5 A 10,000 operations48 V 0.5 A 10,000 operations

    125 V 0.3 A 10,000 operations250 V 0.2 A 10,000 operations

    Cyclic Capacity (L/R = 40 ms):24 V 0.5 A 2.5 cycles per second48 V 0.5 A 2.5 cycles per second

    125 V 0.3 A 2.5 cycles per second250 V 0.2 A 2.5 cycles per second

    Trip and CloseOutputs

    5 A make and carry for 0.2 seconds repetitive.60 Vdc continuous.

    OptoisolatedInput Ratings

    250 Vdc: on for 200 - 300 Vdc; off below 150 Vdc125 Vdc: on for 105 - 150 Vdc; off below 75 Vdc

    48 Vdc: on for 38.4 - 60 Vdc; off below 28.8 Vdc24 Vdc: on for 16.0 - 30 Vdc.

    With nominal control voltage applied, each optoisolated input draws approximately4 mA of current.

  • 21

    Time-Code Input Relay module accepts demodulated IRIG-B time-code input at Port 1 and Port 2(Port 1 is an optional EIA-485 port). Do not connect the time-code input into bothPort 1 and Port 2 at the same time. Relay time is synchronized to within 5 ms oftime-source input.

    SerialCommunications

    Two side-panel and one front-panel EIA-232 serial communications ports.One optional side panel EIA-485 serial port with 2100 Vdc of isolation.

    Per-port baud rate selections: 300, 1200, 2400, 4800, 9600, 19200, 38400.

    Routine DielectricTest

    Control ac power: 2500 Vac for 10 seconds.Optional power supply inputs, optoisolated inputs, analog inputs, and outputcontacts except Trip and Close: 3100 Vdc for 10 seconds.

    Operating Temp. Relay module: -40 to +85C (-40 to +185F)[LCD contrast impaired for temps. below -20C (-4F)]

    Batteries: -40 to +60C (-40 to +140F)Entire SEL-351R unit: -40 to +50C (-40 to +122F)The entire SEL-351R unit was operation tested up to +70C (+158F). The 20C(36F) difference between the +50C rating and +70C allows for temperature risedue to sunlight.

    Battery Specs. Normal Capacity: 8.0 amp-hours at +25C (+77F)Run Time: 20 hours at +25C (+77F), 9 hours at -40C (-40F)

    The above run times presume the following global EZ settings are made:%Battery capacity for sleep = 0% (no battery capacity retained)Turn on the 12 V power = N (12 Vdc power off)

    Estimated Life: 4 years at +25C (+77F), 8 months at +60C (+140F)Recharge Time: 55 hours at +25C (+77F)

    Environment IEC 68-2-30 - 1980 Basic environmental testing procedures, Part 2: Test - TestsCa; Damp heat, cyclic. Severity Level: (12 + 12-hr cycle).IEC 529 - 1989 Degrees of protection provided by enclosures - IP32/NEMA 3R(type test).

    RFI andInterference Tests

    ANSI/IEEE C37.60.6.12 - 1981 Cable Charging Current Interrupting test forautomatic circuit reclosers and fault interrupters for AC systems, 5 Amp rmscharging current interrupted, 20 close-open operations, randomly timed (type testwith a McGraw-Edison VWVE recloser rated for 27 kV, 12 kA interrupting, 560Amp continuous).ANSI/IEEE C37.60.6.13 - 1981 Transformer Magnetizing Current Interruptiontest for automatic circuit reclosers and fault interrupters for AC systems,magnetizing current interrupted equal to 3 1/2% of the continuous current rating ofthe recloser, 20 close-open operations, randomly timed (type test with a McGraw-Edison VWVE recloser rated for 27 kV, 12 kA interrupting, 560 Amp continuous).ANSI/IEEE C37.60.6.14 - 1981 Control Elements SWC tests for automatic circuitreclosers and fault interrupters for AC systems, Oscillatory Surge Test method,6.14.1, applied to control element connections to external devices, 1.0 to 1.5 MHzoscillatory test wave of crest voltage of 2.5 - 3.0 kV occurring in the first half-cycle, decaying to 50% in not less than 6 s.

    IEEE C37.90.1 - 1989 IEEE SWC Tests for Protective Relays and Relay Systems(3 kV oscillatory, 5 kV fast transient) (type test).

  • 22

    IEEE C37.90.2 - 1987 IEEE Trial-Use Standard, Withstand Capability of RelaySystems to Radiated Electromagnetic Interference from Transceivers, 10 V/m(type test with enclosure door open).

    Exceptions:

    5.5.2(2) Performed with 200 frequency steps per octave.5.5.3 Digital Equipment Modulation Test not performed.5.5.4 Test signal turned off between frequency steps to simulate

    keying.IEC 801-4 - 1988 Electromagnetic compatibility for industrial-processmeasurement and control equipment, Part 4: Electrical fast transient/burstrequirements, Severity Level: 4 (4 kV on optional power supply, 2 kV on inputsand outputs) (type test).IEC 255-22-1 - 1988 Electrical disturbance tests for measuring relays andprotection equipment, Part 1: 1 MHz burst disturbance tests. Severity Level 3(2.5 kV common mode, 1.0 kV differential) (type test).IEC 255-22-3 - 1989 Electrical relays, Section 3: Radiated electromagnetic fielddisturbance tests, Severity Level: 3 (10 V/m) (type test).IEC 255-22-4 - 1992 Electrical disturbance tests for measuring relays andprotection equipment, Section 4: Fast transient disturbance test (type test).

    Impulse Tests ANSI/IEEE C37.60.6.2 - 1981 Insulation (Dielectric) tests for automatic circuitreclosers and fault interrupters for AC systems, 1.2 50 s voltage impulse(positive and negative) of crest voltage of 125 kV, applied to recloser with controlconnected (type test with a McGraw-Edison VWVE recloser rated for 27 kV, 12kA interrupting, 560 Amp continuous).IEC 255-5 - 1977 Electrical relays, Part 5: Insulation tests for electrical relays,Section 6: Dielectric Tests, Series C (2500 Vac on analog inputs including controlac power; 3100 Vdc on optional power supply inputs, contact inputs, and contactoutputs excluding Trip and Close). Section 8: Impulse Voltage Tests, 0.5 Joule, 5kV (type test).

    Vibration andShock Test

    IEC 255-21-1 - 1988 Electrical relays, Part 21: Vibration, shock, bump, andseismic tests on measuring relays and protection equipment, Section 1 - Vibrationtests (sinusoidal), Class 1 (relay module only).IEC 255-21-2 - 1988 Electrical relays, Part 21: Vibration, shock, bump, andseismic tests on measuring relays and protection equipment, Section 2 - Shock andbump tests, Class 1 (relay module only).IEC 255-21-3 - 1993 Electrical relays, Part 21: Vibration, shock, bump, andseismic tests on measuring relays and protection equipment, Section 3 - Seismictests, Class 2 (relay module only).

    ESD Test IEC 255-22-2 - 1996 Electrical disturbance tests for measuring relays andprotective equipment, Section 2: Electrostatic discharge tests, Severity Level: 4(8 kV contact discharge all points except serial ports, 15 kV air discharge to allother points) (type test).

    Burn-in Twenty temperature cycles from ambient to 75C (167F) over 48 hours.

  • 23

    Relay Element Pickup Ranges and Accuracies

    Instantaneous/Definite-Time Overcurrent Elements

    Pickup Range: 0.05 - 20.00 A, 0.01 A steps (1 A nominal)0.20 - 34.00 A, 0.01 A steps (1 A nominal - forphase-to-phase elements)0.005 - 1.500 A, 0.001 A steps (0.05 A nominalchannel IN current input)

    Steady-State Pickup Accuracy: 0.01 A and 3% of setting (1 A nominal)1 mA and 5% of setting (0.05 A nominalchannel IN current input)

    Transient Overreach: 5% of pickupTime Delay: 0.00 - 16,000.00 cycles, 0.25-cycle stepsTimer Accuracy: 0.25 cycle and 0.1% of setting

    Time-Overcurrent Elements

    Pickup Range: 0.10 - 3.20 A, 0.01 A steps (1 A nominal)0.005 - 0.160 A, 0.001 A steps (0.05 A nominalchannel IN current input)

    Steady-State Pickup Accuracy: 0.01 A and 3% of setting (1 A nominal)1 mA and 5% of setting (0.05 A nominalchannel IN current input)

    Time Dial Range: 0.50 - 15.00, 0.01 steps (US)0.05 - 1.00, 0.01 steps (IEC)0.10 - 2.00, 0.01 steps (recloser curves)

    Curve Timing Accuracy: 1.50 cycles and 4% of curve time forcurrent between 2 and 30 multiples of pickup

    Under- and Overvoltage Elements

    Pickup Ranges: 0.0 - 150.0 V, 0.1 V steps (various elements)0.0 - 260.0 V, 0.1 V steps (phase-to-phaseelements)

    Steady-State Pickup Accuracy: 1 V and 5% of setting

    Transient Overreach: 5% of pickup

    Synchronism-Check Elements

    Slip Frequency Pickup Range: 0.005 - 0.500 Hz, 0.001 Hz stepsSlip Frequency Pickup Accuracy: 0.003 Hz

    Phase Angle Range: 0 - 80, 1 stepsPhase Angle Accuracy: 2

  • 24

    Under- and Overfrequency Elements

    Pickup Range: 40.10 - 65.00 Hz, 0.01 Hz stepsSteady-State plus Transient Overshoot: 0.01 Hz

    Time Delay: 2.00 - 16,000.00 cycles, 0.25-cycle stepsTimer Accuracy: 0.25 cycle and 0.1% of setting

    Timers

    Pickup Ranges: 0.00 - 999,999.00 cycles, 0.25-cycle steps(reclosing relay and some programmable timers)0.00 - 16,000.00 cycles, 0.25-cycle steps (someprogrammable and other various timers)

    Pickup and dropout accuracy for all timers: 0.25 cycle and 0.1% of setting

    Metering Accuracy

    Accuracies are specified at 20C and at nominal system frequency unless noted otherwise.

    Voltages VA, VB, VC, VS, 3V0, V1, V2 0.2% (33.5 - 150 V)Currents IA, IB, IC 3.0 mA and 0.1% (0.1 - 2 A) (1 A nominal)

    Temperature coefficient:[(0.0002%)/(C)2] * (__C - 20C)2

    (see example below)Currents IN, I1, 3I0, 3I2 0.01 A and 3% (0.1 - 20 A) (1 A nominal)1 mA and 5% (0.01 - 1.5 A) (0.05 Anominal channel IN current input)

    Phase Angle Accuracy 1.0

    Metering accuracy calculation example for currents IA, IB, and IC due to preceding statedtemperature coefficient:

    For temperature of 40C, the additional error for currents IA, IB, and IC is:[(0.0002%)/(C)2] * (40C - 20C)2 = 0.08%

  • 25

    ENCLOSURE DIMENSIONS

    Ground ing Lug

    Contro lCab le

    Receptac le

    D W G : M 3 5 1 R 0 4 2

    1/4" (6.4 mm) dia. holes(6 hole plugs instal led) 1-3/8" (34.9 mm)

    dia. holes (2 holeplugs instal led)

    1/8" (3.2 mm) holes for #4-40screws (8 hole plugs instal led)

    3/8" (9.5 mm) holefor customer lock

    7/8" (22.2 mm) dia. holes(1 vent and 2 hole plugsinstal led)

    1-1/4"(31.8 mm)

    11-1/4"(285.8 mm)

    1-2/10"(30.5 mm)

    14-1/4"(362.0 mm)

    3"(76.2 mm)

    1-3/8"(34.9 mm)

    1-3/8"(34.9 mm)

    2"(50.8 mm)

    1/8" (3.2 mm) holes(4 screws instal ledfor battery tray)

    Figure 12: SEL-351R Recloser Control Grounding Lug Location and Other DimensionalInformation (Bottom View)

  • 26

    11

    -1/4

    "(28

    5.8 m

    m)14

    -1/4

    "(36

    2.0 m

    m)

    D W G : M 3 5 1 R 0 0 7

    FRO

    NTSI

    DEBA

    CK

    BO

    TTO

    MDW

    G:M

    351R

    041

    20-1

    /8"

    (511.2

    mm)24

    -5/8

    "(62

    5.5 m

    m)

    18"

    (457.2

    mm)

    Mou

    ntin

    g ho

    les/

    slots

    for

    5/8"

    (16 m

    m) bo

    lts

    1-1/

    4" (3

    1.8 m

    m) di

    a.ho

    les

    for l

    iftin

    g

    SEL

    drill

    plan

    Trad

    itiona

    ldr

    ill pl

    an

    27"

    (685.8

    mm)

    22"

    (558.8

    mm)

    Figure 13: SEL-351R Recloser Control Dimensions and Mounting Drill Plan

  • 27

    SEL SERVICE AND WARRANTY

    FACTORY ASSISTANCEThe employee-owners of Schweitzer Engineering Laboratories, Inc. are dedicated to makingelectric power safer, more reliable, and more economical.

    We appreciate your interest in SEL products, and we are committed to making sure you aresatisfied. If you have any questions, please contact us at:

    Schweitzer Engineering Laboratories, Inc.2350 NE Hopkins CourtPullman, WA USA 99163-5603Tel: (509) 332-1890Fax: (509) 332-7990We guarantee prompt, courteous, and professional service.

    We appreciate receiving any comments and suggestions about new products or productimprovements that would help us make your job easier.

    NEW PRODUCT WARRANTYAll new products sold to customers are warranted against defects in design, materials, andworkmanship for a period of ten (10) years from the date of first retail delivery to a customer. Ifit is determined that the new product defect is covered under this warranty, SEL will repair,replace, or substitute an identical unit at its own discretion to the customer at no charge.

    Note: The 24 Vdc battery inside the SEL-351R enclosure is excluded from the warranty.

    SEL may, at its own discretion, require the customer to ship the unit back to the factory fordiagnosis before making a determination as to whether it is covered by this warranty. In suchevent, SEL may, at its own discretion, decide to provide the customer with a substitute unitwhich may be sent to the customer either from the SEL factory or from an authorized represen-tative or distributor from their inventory.

    All expenses related to the shipment of defective units back to SEL or the provision of a substi-tute unit to the customer are the responsibility of the customer. This expense may include, but isnot limited to, freight, insurance, Customs clearance, and duties. All expenses related to theshipment of repaired units back to customers (or the provision of a new unit to the customer) willbe borne by SEL.

  • All brand or product names appearing in this document are the trademark or registered trademark of their respective holders.

    Schweitzer Engineering Laboratories, Inc., SELOGIC, and are registered trademarks of Schweitzer Engineering Laboratories, Inc.

    This document is covered by U.S. Patent Nos: 5,208,545; 5,317,472; 5,602,707; 5,515,227; 5,652,688; 5,349,490; 5,365,396; 5,041,737;5,479,315; and 5,694,281.

    Foreign Patents issued and other U.S. and Foreign Patents Pending.

    Copyright SEL 1998 (All rights reserved) Printed in USA.

    SEL-351R Recloser Control 981216

    2350 NE Hopkins Court

    Pullman, WA

    USA

    99163-5603

    Phone: (509) 332-1890

    Fax: (509) 332-7990

    E-mail: [email protected]