SEL-311L

SEL-311L Line Current Differential Protection and Automation System

Ordering Information

Budgetary Price:
$6,045

Fully Optioned Price:
$10,440

Online Product Configuration

SEL-311L-0, -6

SEL-311L-1, -7

Use the SEL-311L Line Current Differential Relay with Integral Four Zone Distance Backup for Easy-to-Apply High-Speed Line Protection.

Apply sub-cycle current differential protection with included four zone distance and directional overcurrent backup. Use single or dual differential channels for reliability. Apply the SEL-311L on two- or three-terminal lines. Unique measuring elements provide coordination with tapped loads. Reduce total project construction and operation costs through integration of the included four-shot recloser and relay logic operators into your automation system.

Improve protection system reliability with continuous checks of communications quality, breaker wear, battery voltage, and relay health. Use the included LCD display in place of traditional panel meters.

  • Secure Line Differential Protection
    Sensitive differential elements provide sub-cycle operating time. Restraint for external faults uses an easy-to-set vector ratio of remote and local currents.

  • Synchrophasor Measurements
    Turn state estimation into state measurement with wide-area measurement of voltage and current phase angles and magnitudes. Improve system stability with high-speed, load-angle measurements. Increase stable loading with analysis of voltage and angular stability.

  • Complete Line Protection
    Protect transmission lines using differential and a combination of four stepped-distance zones of phase and ground-distance elements in communications-assisted schemes, with directional overcurrent element backup protection. Patented Capacitance Voltage Transformer (CVT) transient overreach logic enhances security of Zone 1 distance elements. Best Choice Ground Directional Element™ logic optimizes directional element performance and requires no directional settings.

  • Single-Pole Tripping
    Use the optional single-pole tripping capability of the differential elements to improve system stability.

  • Monitoring and Metering
    Event reports, sequential events recorder (SER), circuit breaker contact wear monitor, substation battery monitor, instantaneous and demand metering, and local display panel.

  • Reclosing
    Programmable four-shot breaker auto-reclose with synchronism and voltage check logic for optimal system restoration.

  • Communications
    Choose from four different channel types for differential communications:
    - ITU-T G.703 codirectional to multiplexer
    - EIA-422 56/64 kbps
    - IEEE C37.94 fiber optic
    - 1300 nm single mode fiber optic

    EIA-232 and EIA-485 serial ports for local/remote access and system integration.

    Mirrored Bits® communications protocol for eight channels of secure relay-to-relay logic communications available on both rear-panel EIA-232 serial ports.

    Download event reports using the optional Ethernet port. Quickly move information with IEC 61850 protocol.

  • acSELerator® SEL-5030 Software
    Helps speed relay application by allowing you to develop relay settings off-line, program SELogic® control equations, and analyze post-fault event reports.

  • Complete pilot protection for primary and backup three-pole tripping schemes on transmission and subtransmission lines.

  • Program up to four shots of automatic breaker reclosing with synchronism and voltage checks to optimize system restoration.

  • Send synchrophasor data to SCADA and wide-area measurement systems using SEL Fast Messages at rates of up to 60 times per minute. Accuracy of ± 1 degree and microsecond timing of event reports improve system visualization and event analysis. Use SEL-5077 synchroWAVe® Server Software to time-correlate synchrophasor data from SEL-311 Relays and send it to display and archiving systems, such as SEL-5078 synchroWAVe Console Software.

  • Use the built-in fault locator to efficiently dispatch line inspection and repair personnel.

  • Program breaker failure logic with SELogic control equations.

  • Schedule as-needed circuit breaker maintenance and send alarms when the breaker monitor detects excess breaker contact wear from the number of operations and magnitude of interrupted current.

  • Alarm for low-voltage conditions on station battery.

  • Use SEL-5040 Power System Report Manager Software to automatically gather relay event reports on your PC and manage them with a database.

  • Use SEL-5010 Relay Assistant Software to manage your relay settings.

  • Use SEL-5601 Analytic Assistant Software to display oscillograms and vector diagrams to analyze event reports.

  • Use the SEL-311L with IEEE C37.94 fiber-optic interface and fiber-optic cable to connect to an SEL-3094 Interface Converter. The SEL-3094 allows you to use a fiber-optic link to multiplexers that have metallic communications interfaces.

  • Single-Pole Tripping

  • Vertical panel-mount hardware package

  • Horizontal panel-mount hardware package

  • DNP3 Level 2 Outstation communications protocol

  • Conformal Coating—Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.

    Learn more about conformal coating. 

  • SEL provides options to help you efficiently and safely commission and test these relays.

  • 4391_tinyStreamline commissioning by using the SEL-4391 Data Courier™ to send and retrieve settings, gather event reports, and install enhancements.

Access drawings via the Online Product Configuration link in the Ordering Information box at the top right of this page (below the product photo).

From the Product Configuration page, configure your product or enter your part number via the Universal Part Number Reverse Lookup. Then, download custom .dwg or .pdf files, specific to your product.

You may also go directly to the Product Configuration page to make a product selection.
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Schweitzer Engineering Laboratories, Inc.

2350 NE Hopkins Court
Pullman, WA 99163 - USA
Phone: +1.509.332.1890
Fax: +1.509.332.7990
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