Schweitzer Engineering Laboratories, Inc. SEL-411L Data Sheet
3
➤
Dual CT Input. For breaker-and-a-half, ring-bus, or double-bus double-breaker bus applications, the SEL-411L
provides proper security for the 87L function by supporting two current inputs for individual measurements of
each breaker. Through the use of SEL
OGIC
®
control equations, you can dynamically include or exclude each current
input from the differential zone. With this capability, you can use the SEL-411L in such advanced applications as
breaker substitution in double-bus single-breaker or transfer bus configurations.
➤ Primary Potential Redundancy. Multiple voltage inputs to the relay provide primary voltage input redundancy.
Upon loss-of-protection (LOP) detection, the relay can use inputs from an electrically equivalent source connected
to the relay.
➤ Comprehensive Metering. The built-in, high-accuracy metering functions can improve feeder loading. Use watt
and VAR measurements to optimize feeder operation. Use differential metering to access remote terminal current
values. Minimize equipment needs with full metering capabilities, including rms, maximum/minimum, demand/peak,
energy, and instantaneous values.
➤ Bay Control. The relay provides bay control functionality with status indication and control for disconnect switches.
The relay features control for as many as two breakers and status indication of as many as three breakers. Numerous
predefined user-selectable mimic displays are available; the selected mimic appears on the front-panel screen in
one-line diagram format. The one-line diagram includes user-configurable labels for disconnect switches, breakers,
bay name, and display for as many as six analog quantities. The relay features SEL
OGIC programmable local control
supervision of breaker and disconnect switch operations.
➤ Breaker Failure. High-speed (less than one cycle) open-pole detection logic reduces coordination times for critical
breaker failure applications. Apply the relay to supply breaker failure protection for all supported breakers. Logic
for breaker failure retrip and initiation of transfer tripping is included.
➤ IEC 60255-149 Compliant Thermal Model. The relay can provide a configurable thermal model for the protection
of a wide variety of devices. This function can activate a control action or issue an alarm or trip when equipment
overheats as a result of adverse operation conditions. A separate resistance temperature detector (RTD) module is
required for this application.
➤ Ethernet Access. The optional Ethernet card grants access to all relay functions. Use IEC 61850 Manufacturing
Message Specification (MMS) or DNP3 protocol directly to interconnect with automation systems. You can also
connect to DNP3 networks through a communications processor. Use File Transfer Protocol (FTP) for high-speed data
collection. Connect to substation or corporate LANs to transmit synchrophasors by using TCP or UDP internet protocols.
➤ Serial Data Communication. The relay can communicate serial data through SEL ASCII, SEL Fast Message,
SEL Fast Operate, M
IRRORED BITS
®
, and DNP3 protocols. Synchrophasor data are provided in either SEL Fast
Message or IEEE C37.118 format.
➤ Automation. The enhanced automation features include programmable elements for local control, remote control,
protection latching, and automation latching. Local metering on the large front-panel LCD eliminates the need for
separate panel meters. Serial and Ethernet links efficiently transmit key information, including metering data, protection
element and control I/O status, synchrophasor data, IEC 61850 Edition 2 GOOSE messages, Sequential Events
Recorder (SER) reports, breaker monitoring, relay summary event reports, and time synchronization. Apply expanded
SEL
OGIC
®
control equations with math and comparison functions in control applications. Incorporate as many as
1000 lines of automation logic to accelerate and improve control actions.
➤ Synchrophasors. You can make informed load dispatch decisions based on actual real-time phasor measurements
from relays across your power system. Record streaming synchrophasor data from the relay for system-wide disturbance
recording. Control the power system by using local and remote synchrophasor data.
➤ Breaker and Battery Monitoring. You can schedule breaker maintenance when accumulated breaker duty
(independently monitored for each pole) indicates possible excess contact wear. The relay records electrical and
mechanical operating times for both the last operation and the average of operations since function reset. Alarm
contacts provide notification of substation battery voltage problems (as many as two independent battery monitors
in some SEL-400 series relays) even if voltage is low only during trip or close operations.
➤ Six Independent Settings Groups. The relay includes group logic to adjust settings for different operating conditions,
such as station maintenance, seasonal operations, emergency contingencies, loading, source changes, and adjacent
relay settings changes. Select the active group settings by control input, command, or other programmable conditions.
➤ Software-Invertible Polarities. Inverting individual or grouped CT and PT polarities allows you to account for
field wiring or zones of protection changes. CEV files and all metering and protection logic use the inverted polarities,
whereas COMTRADE event reports do not use inverted polarities but rather record signals as applied to the relay.
➤ Parallel Redundancy Protocol (PRP). PRP provides seamless recovery from any single Ethernet network failure.
The Ethernet network and all traffic are fully duplicated with both copies operating in parallel.
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