311L#01
Price: $10,808.37 | Savings: $375.00
- Line current differential relay
- Electromechanical relay retrofit
- Horizontal rack mount
SEL-311L
Line Current Differential Protection and Automation System
Use the SEL-311L Line Current Differential Relay with four-zone distance backup for easy-to-apply, high-speed line protection. Apply subcycle 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.
Starting at
$7,860
Line Current Differential Protection
Apply single- or three-pole subcycle differential protection. A vector ratio of the local and remote phase and sequence currents provides high-speed protection independent of line loading, CT saturation, or tapped load. Use a true hot-standby differential channel for increased dependability and security. Loss of the primary channel does not cause loss of protection.
Distance and Overcurrent Backup
Enable up to four zones of phase and ground mho distance elements plus four zones of ground quadrilateral distance elements. Distance protection plus directional and nondirectional overcurrent elements provide a full backup protection system. Apply distance and overcurrent functions in communications-assisted and stepped-distance schemes.
Direct Fiber or Multiplexed Communications
Provide reliability and security with one or two differential communications channels. Select from ITU-T G.703 or EIA-422 electronic interfaces, IEEE C37.94, 1300 nm single-or multimode optical fiber, or 1550 nm single-mode optical fiber. The Alpha Plane restraint characteristic accommodates channel asymmetry and switching without loss of security or sensitivity.
Three-Terminal and Tapped Lines
Accommodate three-terminal lines, even with weak infeed. Tapped line settings make maximum use of communications for secure protection.