SEL-451 Data Sheet
Schweitzer Engineering Laboratories, Inc.
2
➤
High-impedance Fault Detection.
The optional
high-impedance fault (HIF) detection element
operates for small current ground faults typically
caused by downed conductors on surfaces such as
earth, concrete or other poorly conductive
materials. HIF event data are made available in
standard COMTRADE format.
➤
Ethernet Access.
Access all relay functions with
the optional Ethernet card. Interconnect with
automation systems by using IEC 61850 Edition 2
or DNP3 protocol directly. Use file transfer
protocol (FTP) for high-speed data collection.
Connect to substation or corporate LANs to
transmit synchrophasors in the IEEE C37.118–
2005 format by using TCP or UDP Internet
protocols.
➤
Parallel Redundancy Protocol (PRP).
Provide
seamless recovery from any single Ethernet
network failure, in accordance with IEC 62439-3.
The Ethernet network and all traffic are fully
duplicated with both copies operating in parallel.
➤
IEC 61850 Operating Modes.
The relay supports
IEC 61850 standard operating modes such as Test,
Blocked, On, and Off.
➤
IEEE 1588, Precision Time Protocol.
The relay
shall support Precision Time Protocol version 2
(PTPv2). PTP provides high-accuracy timing over
an Ethernet network.
➤
Digital Relay-to-Relay Communications.
Enhanced M
IRRORED
B
ITS
®
communications can
monitor internal element conditions between bays
within a station, or between stations, using SEL
fiber-optic transceivers. Send digital, analog, and
virtual terminal data over the same M
IRRORED
B
ITS
channel.
➤
Monitoring.
Schedule breaker maintenance when
accumulated breaker duty (independently
monitored for each pole of two circuit breakers)
indicates possible excess contact wear. Electrical
and mechanical operating times are recorded for
both the last operation and the average of
operations since function reset. Two independent
DC monitors provide notification of substation
battery voltage problems even if voltage is low
only during trip or close operations.
➤
Breaker Failure.
High-speed (less than one cycle)
open-pole detection logic reduces coordination
times for critical breaker failure applications.
Apply the SEL-451 to supply breaker failure
protection for one or two breakers. Logic for
breaker failure retrip and initiation of transfer
tripping is included.
➤
Sequential Events Recorder (SER).
Record the
last 1000 events, including setting changes, power-
ups, and selectable logic elements.
➤
Dual CT Input.
Apply with ring bus, breaker-and-
a-half, or other two-breaker schemes. Combine
currents within the relay from two sets of CTs for
protection functions, but keep them separately
available for monitoring and station integration
applications.
➤
Comprehensive Metering.
Improve feeder
loading by using built-in, high-accuracy metering
functions. Watt and VAR measurements optimize
feeder operation. Minimize equipment needs with
full metering capabilities including rms,
maximum/minimum, demand/peak, energy, and
instantaneous values.
➤
High-Accuracy Time-Stamping.
Time-tag binary
COMTRADE event reports with real-time
accuracy of better than 10 µs. View system state
information to an accuracy of better than 1/4 of an
electrical degree.
➤
Oscillography and Event Reporting.
Record
voltages, currents, and internal logic points at a
sampling rate as fast as 8 kHz. Off line phasor and
harmonic-analysis features allow investigation of
bay and system performance.
➤
Reclosing.
Incorporate programmable reclosing of
one or two breakers into an integrated substation
control system. Synchronism and voltage checks
from multiple sources provide complete bay
control.
➤
Fault Locator.
Efficiently dispatch line crews to
quickly isolate line problems and restore service
faster.
➤
IEC 60255-Compliant Thermal Model.
Use
the relay to provide a configurable thermal model
for the protection of a wide variety of devices.
➤
Rules-Based Settings Editor.
Communicate with
and set the relay by using an ASCII terminal, or
use QuickSet to configure the SEL-451 and
analyze fault records with relay element response.
➤
Auxiliary Trip/Close Pushbuttons.
These
optional pushbuttons are electrically isolated from
the rest of the relay. They function independently
from the relay and do not need relay power.
➤
Low-Energy Analog (LEA) Inputs.
Reduce costs
and save space with as many as six C37.92-compliant
LEA voltage inputs.
➤
Time-Domain Link (TiDL
®
) Technology.
The
relay supports remote data acquisition through use
of an SEL-2240 Axion
®
. The Axion provides
remote analog and digital data over an IEC 61158
EtherCAT
®
TiDL network. This technology
provides very low and deterministic latency over a
fiber point-to-point architecture. The SEL-451
relay can receive fiber links from as many as eight
Axion remote data acquisition nodes.
