Sel -421-4 Manual
Sel -421-4 Manual

Sel -421-4 Manual

Protection, automation, and control system
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SEL-421-4, -5 Protection,
Automation, and Control System
High-Speed Line Protection,
Automation, and Control System
Key Features and Benefits
The SEL-421-4, -5 Protection, Automation, and Control System combines high-speed distance and directional protec-
tion with complete control for a two-breaker bay.
Complete Distance Protection. You can apply as many as five zones of phase and ground distance and directional
overcurrent elements. Select mho or quadrilateral characteristics for any phase or ground distance element. Use the
optional high-speed distance elements and series-compensation logic to optimize protection for critical lines or
series-compensated lines. Patented coupling capacitor voltage transformer (CCVT) transient overreach logic
enhances the security of Zone 1 distance elements. Best Choice Ground Directional Element
directional element performance and eliminates the need for many directional settings. Apply the distance and
directional elements in communications-based protection schemes such as POTT, DCB, and DCUB, or for
instantaneous or time-step backup protection.
Power Swing Blocking and Out-of-Step Tripping. You can select power swing blocking of distance elements for
stable power swings or out-of-step tripping for unstable power swings. Zero-setting, out-of-step detection logic is
available, eliminating the need for settings and power system studies.
Switch-Onto-Fault. Disconnect status inputs and voltage elements can enable high-speed protection.
Synchronism Check. Synchronism check can prevent circuit breakers from closing if the corresponding phases
across the open circuit breaker are excessively out of phase, magnitude, or frequency. The synchronism-check
function has a user-selectable synchronizing voltage source and incorporates slip frequency, two levels of maximum
angle difference, and breaker close time into the closing decision.
Reclosing Control. You can incorporate programmable single-pole or three-pole trip and reclose of one or two
breakers into an integrated substation control system. Synchronism and voltage checks from multiple sources
provide complete bay control.
Fault Locator. Utilities can efficiently dispatch line crews to quickly isolate line problems and restore service
faster.
Schweitzer Engineering Laboratories, Inc.
®
logic optimizes
SEL-421-4, -5 Data Sheet

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Summary of Contents for Sel SEL-421-4

  • Page 1 High-Speed Line Protection, Automation, and Control System Key Features and Benefits The SEL-421-4, -5 Protection, Automation, and Control System combines high-speed distance and directional protec- tion with complete control for a two-breaker bay. ➤ Complete Distance Protection. You can apply as many as five zones of phase and ground distance and directional overcurrent elements.
  • Page 2 Numerous predefined user-selectable mimic displays are available; the selected mimic appears on the front-panel screen in one-line diagram format. The one-line diagram includes user-configurable labels for disconnect switches, breakers, bay name, and display for as many as six analog quantities. The relay features SEL OGIC programmable local control supervision of breaker and disconnect switch operations.
  • Page 3: Functional Overview

    IEEE 1588, Precision Time Protocol (PTP). PTP provides high-accuracy timing over an Ethernet network. ➤ Digital Relay-to-Relay Communications. M communications can monitor internal element conditions IRRORED between bays within a station, or between stations, using SEL fiber-optic transceivers. Send digital, analog, and virtual terminal data over the same M channel. IRRORED ➤...
  • Page 4: Protection Features

    Zone 1 distance element, resulting from the series capacitor transient response. The SEL-421 simultaneously measures as many as five zones of phase and ground mho distance protection plus Each of the distance elements has a specific reach setting.
  • Page 5 Settings are automatically associated with the stan- dard element zone reach, requiring no additional settings. The SEL-421 uses mho characteristics for phase and ground distance protection. Two zones are fixed in the forward direction, and the remaining three zones can be Quadrilateral Distance Elements set for either forward or reverse.
  • Page 6: Directional Elements

    IRRORED ments. The negative-sequence directional element uses optic transceivers for 3–6 ms relay-to-relay transmission the same patented principle proven in the SEL-321. This time. Among the schemes supported are the following: directional element can be applied in virtually any appli- ➤...
  • Page 7: Combined Current For Protection Flexibility

    Figure 6, Figure 7, and Figure 8 show close-up views of the front panel of the SEL-421. The front panel includes a Figure 6 Factory-Default Status and Trip Target LEDs 128 x 128 pixel, 3" x 3" LCD screen; LED target indica- (8 Pushbutton, 16 Target LED Option) tors;...
  • Page 8: Circuit Breaker Operations From The Front Panel

    You can set these display points to any of the available analog quanti- ties with labels, units, and scaling. The SEL-421 updates these values along with the breakers and switch position in real time to give instant status and complete control of a bay.
  • Page 9: Rack-Type Breakers Mosaics

    When in the test or racked-in positions, the breaker show these targets. can be displayed as open or closed. When racked out, no The SEL-421 features a versatile front panel that you can breaker open/close display are available. The rack-type customize to fit your needs. Use SEL...
  • Page 10: Alarm Points

    LEDs DISPLAY POINTS and operator control pushbuttons and LEDs. The blank Circuit Breaker 1 slide-in label set is included with the SEL-421. You can --Closed-- use templates supplied with the relay or hand label sup- Circuit BK1 SF6 Gas plied blank labels and print label sets from a printer.
  • Page 11: Communications Features

    Form A contact outputs. interrupting outputs. The following additional I/O boards Assign the control inputs for control functions, monitor- are currently available. ing logic, and general indication. You can use SEL OGIC ➤ Eight independent inputs, 13 standard Form A and control equations to program each control output.
  • Page 12: Sntp Time Synchronization

    As many as 64 remote analog outputs. Assign the or as a backup to a higher accuracy time input to the relay. remote analog outputs to virtually any analog quantity available in the relay. You can also use SEL OGIC math variables to develop custom analog quantities for assignment as remote analog outputs.
  • Page 13: Mms Authentication

    (CID) file, the relay requires authentication from any The SEL patented M technology provides IRRORED client requesting to initiate an MMS session. bidirectional relay-to-relay digital communication. Figure 20 shows two relays with SEL-2815 Fiber-Optic Architect Software Transceivers that use M communications. IRRORED communications can operate simultane-...
  • Page 14: Flexible Control Logic And Integration Features

    Outstation relay summary event reports, and settings groups. IEEE C37.118 Phasor measurement protocol. SEL protocol for exchanging digital and analog information among SEL relays and for use as low-speed termi- IRRORED nal connection. IEC 61850 Ethernet-based international standard for interoperability between intelligent devices in a substation.
  • Page 15 , I1, 3I , 3I Remote Terminals A, B, C Differential Current Local terminal/all , I1, 3I , 3I Remote terminals A, B, C Alpha Plane Alpha plane ratio Alpha plane angle alpha Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 16: Oscillography And Event Reporting

    IRIG-B clock input or PTP source to use this feature. SEL-421-4, -5 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 17: Substation Battery Monitor For Dc Quality Assurance

    The relay also monitors breaker motor run time, pole dis- The relay measures and reports the substation battery crepancy, and breaker inactivity. voltage for up to two battery systems. The SEL-411L, SEL-421, SEL-451 support two battery monitors while Breaker Manufacturer's the SEL-487B, SEL-487E, and SEL-487V support one.
  • Page 18: Diagrams And Dimensions

    Figure 22 3U Front Panel, Rack-Mount Option With Standard HMI i4091a Figure 23 5U Front Panel, Panel-Mount Option With Extended HMI and Optional Trip/Close Pushbuttons Figure 24 3U Rear Panel, Main Board With Terminal Block SEL-421-4, -5 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 19 Figure 25 4U Rear Panel, Main Board, Connectorized Option With One (INT5) I/O Board i4149a Figure 26 5U Rear Panel, Main Board With Terminal Block and Two (One INT3 and One INT2) I/O Boards Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 20: Models And Options

    (Horizontal Mounting Shown; Dimensions Also Apply to Vertical Mounting) Figure 27 SEL-421 Dimensions for Rack- and Panel-Mount Models Models and Options ➤ Consider the following options when ordering and con- Chassis size figuring the SEL-421. ➢ 3U, 4U, and 5U (U is one rack unit—1.75 inches or 44.45 mm)
  • Page 21 1 A nominal or 5 A nominal CT inputs ➢ 300 V phase-to-neutral wye configuration PT Contact the SEL factory or your local Technical Service Center for particular part number and ordering informa- inputs tion (see Technical Support on page 23). You can also ➤...
  • Page 22: Specifications

    Not all firmware versions of the SEL-421-4 support 1000 lines. Specifications Saturation Current (Linear) Rating Note: TiDL (EtherCAT) technology is no longer offered in the SEL-421-4, -5. TiDL (T-Protocol) is available in the SEL-421-7. If the relay uses TiDL 1 A Nominal: 20 A (EtherCAT), the operating times will be delayed by 1.5 ms.
  • Page 23 Note: Do not use hybrid control outputs to switch ac control signals. 300 Vdc continuous voltage Limiting Breaking 10,000 operations Capacity/Electrical 10 operations in 4 seconds, followed by Endurance: 2 minutes idle Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 24 48, 110, 125, 220, 250 V level-sensitive Approximate Range: 2 km Current Drawn: <5 mA at nominal voltage Data Rate: 100 Mbps <8 mA for 110 V option Typical Fiber Sampling Rate: 2 kHz Attenuation: –2 dB/km SEL-421-4, -5 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 25 10 AWG (5.3 mm Potential (Voltage) 18 AWG (0.8 mm 14 AWG (2.5 mm Connection Contact I/O 18 AWG (0.8 mm 10 AWG (5.3 mm Other Connection 18 AWG (0.8 mm 10 AWG (5.3 mm Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 26: Reporting Functions

    64 local control bits Test Ad: 16 hours at –40°C 32 latch bits in protection logic Cold, Storage: IEC 60068-2-1:2007 32 latch bits in automation logic Test Ad: 16 hours at –40°C SEL-421-4, -5 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 27 <5% of setting plus steady-state accuracy IEC: 0.05–1.00, 0.01 steps Operating Time: See Figure 2. Curve Timing Accuracy: ±1.50 cycles plus ± 4% of curve time (for current between 2 and 30 multiples of pickup) Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 28 PT 100, NI 100, NI 120, and CU 10 RTD-Types Supported, Field Selectable Breakers: 2 (control), 3rd indication As long as 500 m Fiber-Optic Cable to SEL-2600 RTD Module Disconnects (Isolators): 10 (maximum) Breaker Failure Instantaneous Overcurrent Timers Setting Range: 1–99999 cycles, 1-cycle steps...
  • Page 29 ±0.1% (33.5–300 V L–N Phase and Phase-to-Phase Angle: ±0.5° (33.5–300 V L–N Sequence Voltage Magnitude: ±0.1% (33.5–300 V Sequence Voltage Angle: ±0.5° (33.5–300 V Frequency (Input 40–65 Hz) Accuracy: ± 0.01 Hz Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 30: Technical Support

    Technical Support We appreciate your interest in SEL products and services. If you have questions or comments, please contact us at: Schweitzer Engineering Laboratories, Inc. 2350 NE Hopkins Court Pullman, WA 99163-5603 U.S.A. Tel: +1.509.338.3838 Fax: +1.509.332.7990 Internet: selinc.com/support Email: info@selinc.com SEL-421-4, -5 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 31 Notes Schweitzer Engineering Laboratories, Inc. SEL-421-4, -5 Data Sheet...
  • Page 32 2350 NE Hopkins Court • Pullman, WA 99163-5603 U.S.A. Content subject to change without notice. Tel: +1.509.332.1890 • Fax: +1.509.332.7990 Unless otherwise agreed in writing, all SEL product sales are subject to SEL’s terms and selinc.com • info@selinc.com conditions located here: https://selinc.com/company/termsandconditions/.

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Sel-421-5

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