SEL-411L Advanced Line Differential Protection, Automation, and Control System
Apply the SEL-411L Relay for complete protection and control of any transmission line. The SEL-411L provides differential protection with both phase- and sequence-based operating elements for sensitivity and high-speed operation. 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 backup protection and integration. Any transmission line (short, long, or series compensated) can be well protected with the SEL-411L Relay.
- High-Speed and Security in Line Differential Protection
Differential elements provide subcycle operating times to improve system stability. 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. Multiterminal lines and transformers in the differential zone are protected. - Reliable Backup Protection
Complete distance and directional elements provide backup protection in case the differential communications channel is lost. All the features of the SEL-421 Relay are included in addition to the differential protection. - Complete Reclosing System With Synchronism Check and High-Speed Breaker Failure Detection for Two Breakers
Dual CT and VT 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 cycle allows the use of shorter breaker failure margin times. Independent current inputs provide protection for two circuit breakers. - Synchrophasor Measurements to Increase Asset Utilization
Validate system load flow and fault models using instantaneous voltage angles. Use system-state measurements to increase stable system loading through reduced margin requirements. Use IEEE C37.118 format with 1–60 messages per second or SEL Fast Message format for interleaved communications. Apply direct relay-to-relay synchrophasors for wide-area-based control without additional devices. - True Digital Fault Recorder (DFR) Functionality
Use binary COMTRADE event reports sampled at 8 kHz directly from the relay without expensive auxiliary equipment.
- Use high-speed single- or three-pole line current differential with distance protection backup for critical transmission lines.
- Connect to serial (or Ethernet networks (coming soon)) for differential communications.
- Apply complete bay control, reclosing, and breaker failure protection for two breakers.
- View synchrophasors from any location with an SEL-411L to measure the system state. Use 1–60 messages per second in high-accuracy IEEE C37.118 data format.
- Control generators or shed loads using synchrophasors directly from another device with IEEE C37.118 synchrophasors.
- Monitor circuit breaker performance, including average and last tripping time, compressor run time, and contact-interrupting duty.
- Use expanded SELogic® control equations for custom applications, such as capacitor voltage differential, voltage-restrained overcurrent, or thermal emulation of transmission lines.
- Combine the DFR functions of the SEL-411L with SEL software to view system-wide events with microsecond timing accuracy.
- Provide thermal overload protection.*
* Connect to an SEL-2600 RTD Module using a fiber-optic transceiver.
- Subcycle distance and directional elements suitable for series-compensated lines.
- Conformal-coated circuit boards.
- Ethernet communications.
- IEC 61850 communications.
Channel interface:
- Isolated EIA-422
- Isolated ITU-T G.703
- 850 nm or 1300 nm fiber, IEEE C37.94 encoding*
- 1300 nm single- or multimode fiber*
- 1550 nm single-mode fiber*
- One or two channels.
- Vertical or horizontal, panel- or rack-mount hardware package.
- Inputs/outputs (settable or level-sensitive, optoisolated).
* Connect to an SEL-2600 RTD Module using a fiber-optic transceiver.
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