html{display:none} SEL-411L Advanced Line Differential Protection, Automation, and Control System | Schweitzer Engineering Laboratories

SEL-411L—The Industry Benchmark

Transmission Protection

The Only Relay With Traveling Wave Fault Location

The SEL-411L Advanced Line Differential Protection, Automation, and Control System is the industry benchmark for transmission line protection. The relay provides a wide range of applications and benefits:

Traveling Wave Fault Location (TWFL)
Pinpoint the fault location to within a tower span. Accurate fault location reduces costs by allowing line crews to spend less time out in the field and to restore power to customers faster. The TWFL is done automatically within the relay for two-terminal lines.

Subcycle Current Differential and Distance Protection
Apply the SEL-411L for the high-speed protection of any transmission line. The current differential function provides sensitive and reliable protection for up to four-terminal lines, while the proven distance elements give five zones of distance protection.

Multiterminal Protection With Fault Location
Protect up to four-terminal lines with line current differential elements using Ethernet communication. The unique fault location algorithm uses information from all terminals to identify the faulted branch.

Synchronized Phasor Measurements
Monitor voltages, currents, phase angles, and breaker status using IEEE C37.118 compliant synchrophasors. Receive synchrophasors from other IEEE C37.118 devices, and perform logic for advanced control schemes.

Advanced Automation and Communications
Apply DNP3, IEC 61850, SEL Fast Message, and other protocols for complete automation systems. Send data to other IEC 61850 devices for protection logic or control purposes.

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