SEL-487E Data Sheet Schweitzer Engineering Laboratories, Inc.
2
➤
Distance Protection. Mho or quadrilateral characteristics protect transformers and transmission lines with four
zones of phase distance and ground distance elements. Line harmonic blocking, load-encroachment, coupling
capacitor voltage transformer (CCVT) detection, and out-of-step blocking logic add security to your distance
protection scheme.
➤ Transformer and Feeder Backup Protection. Adaptive time-overcurrent elements with selectable operating
quantity, programmable pickup, and time-delay settings provide transformer and feeder backup protection.
➤ Reclosing Control. You can incorporate programmable three-pole trip and reclose of as many as six independent
breakers into an integrated substation control system.
➤ Reverse Power Flow and Overload Condition Protection. The SEL-487E directional real- and reactive-power
elements guard against reverse power flow and overload conditions.
➤ Synchronism Check. Synchronism check can prevent circuit breakers from closing if the corresponding phases
across the open circuit breaker are excessively out of phase, magnitude, or frequency. The synchronism-check
function has a user-selectable synchronizing voltage source and incorporates slip frequency, two levels of maximum
angle difference, and breaker close time into the closing decision.
➤ Input/Output Scaling. The SEL-2600 RTD Module provides as many as 12 temperature inputs, and the
SEL-2505/SEL-2506 Remote I/O Modules provide a scalable number of discrete I/O points.
➤ Two CT Input Levels. Selectable 1 A or 5 A nominal secondary input levels are available for any three-phase
winding input.
➤ Large CT Mismatch Ratio. The relay can accommodate CT ratio mismatch as great as 35:1.
➤ 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.
➤ Digital Secondary Systems (DSS) Technologies. You can order the relay as either an SV subscriber relay or a
TiDL relay. DSS capable relays receive current and voltage information that is published by remote merging units
instead of standard PT and CT inputs. DSS technologies reduce copper cable lengths and associated installation
labor costs and improve the overall safety of the substation.
➤ IEC 61850-9-2LE SV Relay. The SV subscriber relay can subscribe to current and voltage information that is
published by as many as seven remote SV merging units that are compliant with the IEC 61850-9-2LE guideline.
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