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SEL-411L

Advanced Line Differential Protection, Automation, and Control System

Apply the SEL-411L for complete protection and control of any transmission line (short, long, or series-compensated). The SEL-411L provides differential and distance protection with both phase- and sequence-based operating elements for sensitivity and high-speed operation.

You can choose from many popular fiber and multiplexed communications options. Distance protection and logic from a complete SEL-421 Protection, Automation, and Control System are included to provide redundant protection and integration. The SEL-411L includes a traveling-wave fault locating method to locate faults within a tower span. Broken conductor detection in the SEL-411L detects conductor breaks in overhead lines. This function can prevent a shunt fault that could occur from a falling conductor. Use Time-Domain Link (TiDL) technology and Sampled Values (SV) technology using IEC 61850-9-2 to transform the way you modernize your substation.

SEL-400 Series Relay Mimic Diagrams

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Line Current Differential Protection—Apply subcycle single- or three-pole line current differential protection with backup distance protection for transmission lines using serial or Ethernet for differential communications. Patented generalized Alpha Plane technology combined with overcurrent supervision, external fault detection, and disturbance detection logic enables the 87L function to operate with exceptional security and sensitivity. You can invert individual or grouped CT or PT polarities to account for field wiring or protection zone changes.

Series-Compensated and Long Lines—Prevent Zone 1 overreach on series-compensated lines with optional logic in the SEL-411L-1. Built-in charging compensation improves the sensitivity and speed of differential protection for long lines.

In-Line Transformers—Simplify protection schemes and reduce equipment costs by providing complete protection for the combined line and transformer. The 87L function of the relay allows in-line transformer applications that compensate for vector group, ratio, and zero sequence of the in-zone transformer. Use harmonic blocking, restraint, or both for stabilization under magnetizing inrush conditions.

Out-of-Step Blocking and Tripping—During power swings, the relay automatically selects either out-of-step blocking or out-of-step tripping. Out-of-step blocking enhances your security by blocking distance elements during stable swing conditions. During unstable power swing conditions, the SEL-411L implements out-of-step tripping to maintain balance between generation and load.

Multiterminal Transmission Lines—Protect lines with up to four terminals. Apply the SEL-411L on breaker-and-a-half bus configurations or other two-breaker schemes with the relay’s dual CT and PT inputs. Efficiently dispatch line crews to quickly isolate line problems and restore service faster. The multiterminal fault location system quickly locates faults, even on lateral transmission lines.

Traveling-Wave Fault Locator—Accurately pinpoint faults with time-synchronized traveling-wave fault location. Save time and money by sending maintenance crews to the tower nearest the fault.

Broken Conductor Detection—Detect conductor breaks in subtransmission or transmission overhead lines using the broken conductor detection function. This function can prevent a shunt fault that could occur from a fallen conductor. Configure the broken conductor detection function to block autoreclose attempts onto permanent faults. The function also provides the location of the conductor break to aid in restoring the power line.

Bay Control, Reclosing, and Breaker Failure Detection—Apply complete bay control, reclosing, and breaker failure protection for two breakers. Monitor circuit breaker performance, including the average and last tripping time, motor run time, and contact-interrupting duty.

Reliable Distance Protection—Provide reliable backup protection with five zones of phase and ground distance elements that include directional overcurrent elements for subcycle operation and security.

Thermal Overload Protection—Use the three independent IEC 60255-149 thermal elements to activate a control action, issue an alarm, or trip when equipment overheats as a result of adverse operating conditions. The SEL-2600 RTD Module provides ambient temperature measurements.

Digital Secondary System TechnologiesTiDL and SV technologies for digital secondary systems replace copper wire with fiber-optic cable to increase safety, reduce costs associated with using copper, improve reliability, and limit the impact of an electromagnetic pulse. Apply the SEL-411L-2 TiDL relay with the SEL-TMU TiDL Merging Unit in the field to provide remote I/O and communicate digitized analog signals over fiber optics. This simple point-to-point solution with a strong cybersecurity posture is easy to implement, with no external time source or network engineering required. Apply the SEL-411L-2 SV relay to receive IEC 61850-9-2 SV data from a remote merging unit and exchange data with GOOSE messages using a network. Both TiDL and SV relays can be configured using SEL Grid Configurator software, which simplifies settings management.

Features

    1. 1

      EIA-232 front serial port is quick and convenient for system setup and local access.

    2. 2

      Front-panel display allows operators to control and view the status of disconnects and breakers.

    3. 3

      User-selectable mimic screens show the system configuration in one-line diagram format.

    4. 4

      Easy-to-use keypad aids simple navigation.

    5. 5

      24 programmable target LEDs with user-configurable labels alert operators in the substation to faulted phases, the relay’s status, and element operation.

    6. 6

      Programmable operator pushbuttons with user-configurable labels allow front-panel customization.

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    1. 1

      Choose from a vertical or horizontal, panel-mount or rack-mount chassis and different size options.

    2. 2

      Choose either fiber or copper connections for one or two 87L communications channels.

    3. 3

      Communications protocols include FTP, Telnet, synchrophasors, DNP3 LAN/WAN, IEC 62439-3 PRP, IEEE 1588 PTPv2, and IEC 61850 Edition 2 (optional feature). 

    4. 4

      Three EIA-232 serial ports for Mirrored Bits communications, SCADA, and engineering access provide flexibility to communicate with other devices and control systems. The ports include demodulated IRIG-B for precise-time input.

    5. 5

      Six current and six voltage analog inputs support protection for substations with dual-breaker schemes.

    6. 6

      The power supply allows different options: 24–48 Vdc; 48–125 Vdc or 110–120 Vac; or 125–250 Vdc or 120–240 Vac.

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      4U chassis with mounting options (vertical or horizontal; panel or rack) accommodates your application needs.

    2. 2

      LEDs indicate the connection status to an SEL-TMU TiDL Merging Unit on a per-port basis.

    3. 3

      Eight 100 Mbps fiber-optic ports allow the TiDL relay to connect with eight remote SEL-TMU devices and to receive remote analog and digital data.

    4. 4

      Choose either fiber or copper connections for one or two 87L communications channels.

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      The 4U chassis has various mounting options to accommodate hardware needs.

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      Choose either fiber or copper connections for one or two 87L communications channels. 

    3. 3

      Select fiber-optic, copper, or mixed Ethernet with separate ports for SV data and engineering access.

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Details

High-Speed Differential Protection
Differential elements improve system stability with subcycle operating times . Line charging current compensation provides an accurate response for long or short lines. Apply the proven Alpha Plane operating principle for reliable and secure operation. Serial or Ethernet channels can be used for differential protection.

Multiterminal Protection With Fault Location
Line current differential protection provides high-speed protection for multiterminal lines, even with two breakers per terminal. Protect up to four terminals using serial communications or up to four terminals using Ethernet. In addition, the multi-ended impedance-based fault locating algorithm uses information from all terminals to accurately locate faults.

Distance Protection
Complete subcycle distance and directional elements provide standalone protection or backup protection to differential schemes in the event that communications are lost. Best Choice Ground Directional Element logic optimizes directional element performance and eliminates the need for many directional settings. Apply the distance and directional elements in communications-based protection schemes like POTT, DCB, and DCUB, or for instantaneous or time-step backup protection.

Complete Reclosing System With Synchronism Check and High-Speed Breaker Failure Detection for Two Breakers
Dual CT and PT input logic and settings are included for control of two circuit breakers. Settable voltage inputs provide flexible operation. Open-pole detection in less than 5/8 of a cycle allows the use of shorter breaker failure margin times. Independent current inputs provide protection for two circuit breakers.

Fault Locating
Accurately pinpoint faults using the double-ended traveling-wave fault locating method. Save time and money by sending maintenance crews to the tower closest to the fault.At the same time, ensure dependability with single- and multi-ended impedance-based fault-locating methods.

Broken Conductor Detection
The Broken Conductor Detection (BCD) element is designed to detect a conductor break before it converts into a shunt fault for overhead lines. The BCD element can help in mitigating possible fire or public hazard. The detection logic compares the measured current against the line charging current threshold and uses the angular difference between the phase voltage and phase current to detect the conductor break. Additionally, the BCD function includes fault locating and phase identification to assist the user in restoring service.

Synchrophasor Measurements to Increase Asset Utilization
Use IEEE C37.118.1/2-2011, -2014a Standard for Synchrophasor Measurements for Power Systems with 1–60 messages per second to analyze power system events and to validate system load flow and fault models. Apply direct relay-to-relay synchrophasors for wide-area-based control without additional devices.

True Digital Fault Recorder (DFR) Functionality
Use records sampled at 8 kHz in IEEE C37.111-2013 COMTRADE format to analyze power system events directly from the relay without the need for dedicated equipment.

Flexible Communications
An Ethernet card option provides two copper or fiber ports for communication with failover redundancy. Simplify Ethernet network topology and reduce external equipment with dual Ethernet ports that offer a switched mode for looped Ethernet networks. Available Ethernet communications protocols include FTP, Telnet, DNP3 LAN/WAN, the IEEE 1588 Precision Time Protocol Version 2 (PTPv2), IEC 61850 Edition 2, IEEE C37.118.1/2-2011, -2014a synchrophasors, and the IEC 62439-3 Parallel Redundancy Protocol (PRP).

Time-Domain Link Technology
Apply a TiDL solution where SEL-TMU devices are placed in the yard close to the primary equipment to digitize discrete I/O signals and analog data and then transport them over a fiber-optic cable to the SEL-411L-2 TiDL relay in the control house. Each SEL-TMU can share data with as many as four TiDL relays, providing protection design flexibility and reducing device count. TiDL technology provides a simple and secure solution using point-to-point connections and a non-Ethernet protocol. Because a TiDL system does not need an external time source or Ethernet switches, it is easy to configure and commission.

Sampled Values Technology
Implement an SV solution, where the merging unit (publisher) digitizes analog signals from primary equipment and then transmits them to an SEL-411L-2 SV relay (subscriber) in the control house via a fiber-based Ethernet network. The system uses precise time synchronization via IRIG-B or PTP. The SEL-411L-2 SV relay offers the traditional protection available in the SEL-411L-1 and can also receive SV data from devices such as the SEL-401 Protection, Automation, and Control Merging Unit or the SEL-421-7 Protection, Automation, and Control System Merging Unit. Because all SEL SV devices are implemented with IEC 61850-9-2 and the UCA 61850-9-2LE guideline, the SEL-411L-2 SV relay can be used with other manufacturers’ SV units.

Simplified Settings Management
The SEL-411L-2 TiDL and SV relays can be configured using SEL Grid Configurator software, which increases efficiency and improves settings insights. It features a spreadsheet-style editor, protection visualization, comprehensive reporting, custom filters, and multiple-device settings management.

  • Subcycle distance and directional elements suitable for series-compensated lines
  • Traveling-wave fault location
  • Broken conductor detection logic
  • IEEE C37.118-2011 synchrophasor standard
  • Digital secondary system solutions
    • SEL-411L-2 relay with TiDL technology
    • SEL-411L-2 relay (subscriber) with IEC 61850-9-2 Sampled Values
  • Conformal-coated circuit boards
  • Four Ethernet ports
  • IEC 61850 Edition 2 communications and IEEE 1588 Precision Time Protocol Version 2 (PTPv2)
  • IEEE C37.118.1/2-2011, -2014a Synchrophasor standard
  • Connectorized hardware configuration
  • Channel interface:
    • Isolated EIA-422
    • Isolated ITU-T G.703
    • 850 nm or 1,300 nm fiber, IEEE C37.94 encoding
    • 1,300 nm single- or multimode fiber
    • 1,550 nm single-mode fiber
    • 10/100BASE-T Ethernet
    • 100BASE-FX Ethernet
  • One or two channels.
  • 4U, 5U, 6U, or 7U chassis for up to four I/O boards
  • Vertical or horizontal, panel- or rack-mount hardware package
  • Inputs/outputs (settable or level-sensitive, optoisolated)

Minimum Software Version

Video

SEL Time-Domain Link (TiDL) Technology

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-411L R129-V0 SEL-411L-R129-V0-Z019004-D20220928 10/18/22 ~1222910001
SEL-411L-1 R129-V0 SEL-411L-1-R129-V0-Z019004-D20220928 10/18/22 ~1222910001
SEL-411L-2 R201-V0 SEL-411L-2-R201-V0-Z101100-D20220928 10/18/22 ~1222910001
SEL-411L-A R129-V0 SEL-411L-A-R129-V0-Z019004-D20220928 10/18/22 ~1222910001

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Minimum Software Version

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