SEL-311L Line Current Differential Protectionadmin2015-09-28T16:19:39+00:00
Project Description
SEL-311L Line Current Differential Protection and Automation System
Use the SEL-311L Line Current Differential Relay with integral 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.
Functional Overview
21
Phase and Ground Distance
25
Synchronism Check
50
Overcurrent
51
Time-Overcurrent
67
Directional Overcurrent
79
Autoreclosing
81
(O, U) Over-/Underfrequency
87L
Current Differential
DFR
Event Reports
LGC
Expanded SELOGIC Control Equations
HMI
Operator Interface
PMU
Synchrophasors
SER
Sequential Events Recorder
BRM
Breaker Wear Monitor
LOC
Fault Locator
SBM
Station Battery Monitor
Front- and Rear-Panel Diagrams
Front
Rear
Protect
Apply single-pole or three-pole subcycle current differential protection. Reduce protection system costs by using built-in distance and/or overcurrent backup functions.
Simplify
Innovative operating characteristic makes settings easy. No fault studies are required for most differential applications.
Optimize
Use single or dual channels for reliability. Apply on two- or three-terminal lines with or without tapped lines.
Monitor
Incorporate synchrophasor measurements into wide-area protection and control systems. Use high-accuracy time correlation to improve event report analysis.
Automate
Reduce total project construction and operation costs by integrating four-shot recloser and relay logic operators into your automation system.
Integrate
Improve station integration with serial and Ethernet communications. Use IEC 61850 communications for interoperability between relays with a select-before-operate function for added operational security. Increase communications dependability with dual failover Ethernet.