Sel SEL-487B User manual

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
Busbar and Breaker Failure Protection,
Automation, and Control System
Major Features and Benefits
The SEL-487B Relay provides bus current differential protection, circuit breaker failure protection, and
backup overcurrent protection. The relay has 21 analog current inputs and three analog voltage inputs. For
buses with no more than seven terminals, use one SEL-487B in a single-relay application. For buses with
eight to ten terminals, use two SEL-487B relays. For buses with as many as 21 terminals, use three SEL-487B
relays; each relay provides as many as six independent and adaptable zones of protection. Contact SEL
Research and Development for methods on protecting larger systems.
➤Busbar differential protection operates in less than one cycle to increase system stability margins and
reduce equipment damage.
➤Flexible zone selection and six differential zones provide protection for multiple busbar applications.
➤Failed CT detection elements reliably indicate open and shorted CTs for alarming and/or blocking.
➤Differential protection accommodates as high as 10:1 CT ratio mismatch without auxiliary CTs.
➤Differential protection is secure for external faults with minimal CT requirements.
➤Breaker failure protection for each terminal integrates bus and breaker failure protection.
➤Instantaneous and inverse time-overcurrent elements provide backup protection for each terminal.
➤Negative- and zero-sequence over- and undervoltage elements provide for differential element supervi-
sion.
➤Three dedicated check zones are available in each relay to supervise complex bus differential schemes.
➤Interconnection with automation systems uses IEC 61850 or DNP3 protocols directly or DNP3
through a Communications Processor. Use FTP for high-speed data collection.
SEL-487B Bus Differential Relay

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
2
➤The relay records a wide range of system events with sampling rates as fast as 8 kHz, and as much as
24 seconds of data per COMTRADE compliant event report.
➤Parallel Redundancy Protocol (PRP) provides 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.
➤IEEE 1588, Precision Time Protocol version 2 provides high-accuracy timing over an Ethernet net-
work.
➤Time-domain link (TiDL) technology allows for remote data acquisition through use of the SEL-2240
Axion. The Axion provides remote analog and digital data over an IEC 61158 EtherCAT TiDL net-
work. This technology provides very low and deterministic latency over a fiber point-to-point architec-
ture. The SEL-487B-1 Relay can receive fiber links from as many as eight Axion remote data
acquisition nodes.
Functional Overview
Figure 1 SEL-487B Relay Basic Functions in a Double-Bus Application
ANSI NUMBERS/ACRONYMS AND FUNCTIONS
16 SEC Access Security (Serial, Ethernet)
27/59 Over- and Undervoltage
50 Overcurrent
50BF Breaker Failure Overcurrent
51 Time-Overcurrent
85 RIO SEL M
IRRORED
B
ITS
Communications
87 Current Differential
DFR Event Reports
HMI Operator Interface
LGC Expanded
SEL
OGIC Control Equations
MET High-Accuracy Metering
RTU Remote Terminal Unit
SER Sequential Events Recorder
ADDITIONAL FUNCTIONS
SBM Station Battery Monitor
1 Copper or Fiber Optic * Optional Feature
ADDITIONAL FEATURES
Open CT Detection
Three Independent Check Zones
Disconnect Status and Monitoring Logic for 60 Disconnects
Single-Relay Application: 2 Three-Phase Zones for as many as 7 Terminals
Two-Relay Application: 3 Three-Phase Zones for as many as 10 Terminals
Three-Relay Application: 6 Single-Phase Zones for as many as 21 Terminals
4
EIA-232
2
Ethernet
1
*
16
S
E
C
27
59
85
RIO
DFR HMI LGC
MET SBMRTU SER
1
IRIG-B
SEL-487B
52-1
3
52-2
3 3 3
52-3
3
52-4
33
52-5
52-6
3 3
50 50 50 50 50 50 50
51 51 51 51 51 51 51
50BF 50BF 50BF 50BF 50BF 50BF 50BF
8787
Zone 1
Zone 1
Zone 2
Zone 2
PT898989
8989
8989
Tie Breaker
TiDL Time-Domain Link Remote Data Acquisition

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
3
Protection Features
Order the 9U chassis version of the SEL-487B to equip
the relay with a maximum of four interface boards. With
four interface boards, the relay has a total of 103 inputs
(72 common inputs and 31 independent inputs) and
40 outputs (24 high-speed, high-current interrupting out-
puts and 16 standard outputs).
Order the 7U chassis version of the SEL-487B to equip
the relay with a maximum of two interface boards. With
two interface boards, the relay has a total of 55 inputs
(36 common inputs and 19 independent inputs) and
24 outputs (12 high-speed, high-current interrupting
outputs and 12 standard outputs).
The 7U and 9U chassis options for the SEL-487B both
contain 21 current inputs and three voltage inputs.
With the flexibility of the expanded SELOGIC control
equations, you need no external auxiliary relays to
configure the relay for complex busbar arrangements.
The SEL-487B provides station-wide protection through
the use of up to six zones of differential protection,
advanced zone selection algorithms, and per-terminal
breaker failure and overcurrent protection.
Dynamic Zone Configuration
The SEL-487B dynamically assigns the input currents to
the correct differential elements without the need for
auxiliary relays. Connect the digital inputs from the bus-
bar disconnect auxiliary contacts directly to the relay.
SELOGIC control equations and zone selection logic will
correctly assign the currents to the differential elements,
even for complex bus arrangements such as the one in
Figure 2.
Busbar configuration information, as a function of the
disconnect status, is readily available. Figure 3 depicts
the response of the relay to the ZONE command,
showing the terminals and bus-zones assigned to each
protection zone.
Figure 2 Bus-Zone Protection Based on Disconnect Switch Positions
52 52
52
52
Silicon
Zone 1
Zone 2 Zone 4
Zone 3
Helium
52
Argon
52
Lithium
Krypton
52
Sodium
Neon
North
52
Boron
East West
South
DS1
DS2 DS3

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
4
=>>ZONE <Enter>
BUS PROTECTION
Rinadel Station
Terminals in Protection Zone 1
HELIUM SILICON
Bus-Zones in Protection Zone 1
NORTH
Terminals in Protection Zone 2
BORON ARGON LITHIUM
Bus-Zones in Protection Zone 2
EAST
Terminals in Protection Zone 3
SILICON KRYPTON
Bus-Zones in Protection Zone 3
SOUTH
Terminals in Protection Zone 4
SODIUM NEON
Bus-Zones in Protection Zone 4
WEST
=>>
Figure 3 Result of ZONE Command Indicating the Protection Zone Configuration According to Disconnect Switch Positions
Figure 4 Bus Arrangement With Disconnect DS2 Closed; the New Zone 1 That Includes Bus-Zones North and East
=>>ZONE <Enter>
BUS PROTECTION
Rinadel Station
Terminals in Protection Zone 1
HELIUM SILICON BORON ARGON LITHIUM
Bus-Zones in Protection Zone 1
NORTH EAST
Terminals in Protection Zone 3
SILICON KRYPTON
Bus-Zones in Protection Zone 3
SOUTH
Terminals in Protection Zone 4
SODIUM NEON
Bus-Zones in Protection Zone 4
WEST
=>>
Figure 5 Result of ZONE Command, Showing the Protection Zone Configuration After Zone 1 Merges With Zone 2
52
52 52 5252 52 52 52
Silicon
Zone 4
Zone 1 Zone 3
Helium
Boron
Argon
Lithium
Krypton
Sodium
Neon
North
East West
South
DS1
DS2 DS3

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
5
Closing disconnect DS2 combines Zone 1 and Zone 2,
resulting in a single zone. Figure 4 shows the new
protection zone configuration. In this combination, Zone
1 includes North and East bus-zones. Figure 5 shows the
new Zone 1 that includes bus-zones North and East.
Zone Selection Logic
Busbar protection requires assignment of the correct cur-
rent values to the appropriate differential elements as a
function of user-defined conditions. To achieve this, the
SEL-487B employs a two-step process:
➤Evaluates the user-defined conditions.
➤Assigns the currents to the differential element of
the appropriate zone.
Current assignment conditions vary from simple to
complex. A simple condition would be a statement such
as “always include this terminal in the differential
calculations.” A more complex condition statement could
be “when Disconnect 2 is closed, and the transfer
disconnect is open.”
SELOGIC control equations provide the mechanism by
which the user enters the conditions for assigning the
currents to the differential elements when these
conditions are met. When a SELOGIC control equation
becomes true (e.g., the disconnect is closed), the relay
dynamically assigns the current to the differential
elements. Conversely, when the SELOGIC control
equation is false (the disconnect is open), the relay
dynamically removes the currents from the differential
elements. This is also true for the trip output. When the
SELOGIC control equation of a terminal is false, the relay
issues no trip signal to that terminal. Table 1 shows a
simple case where the disconnect status is the only
condition for the relay to consider.
End-Zone Protection
To illustrate the flexibility of use of SELOGIC control
equations for user-defined conditions, consider the ease
of achieving end-zone protection with the SEL-487B.
Figure 6 shows fault F1 between an open circuit breaker
and CT of a feeder at a substation. This area is a “dead”
zone because neither busbar protection nor local line
protection can clear this fault; the remote end of the
feeder must clear this fault. Because the feeder circuit
breaker is already open, operation of the busbar
protection serves no purpose. The busbar protection must
not operate for this fault.
Figure 6 Fault Between Breaker and CT
By including the circuit breaker auxiliary contact in one
of the SELOGIC control equations (Figure 7), we can
cause the value of the SELOGIC control equation to be
false when the circuit breaker is open, removing the
current from the differential element calculations. This
capability ensures stability of the busbar protection. By
our use of SELOGIC control equations and normal
communications channels to configure the protection
system, the relay sends a trip signal to the remote end of
the feeder.
Figure 7 Bus Protection Is Not Affected by Fault, F1;
Use Transfer Trip to Clear the Fault
Check Zones
The SEL-487B provides three completely independent
check zones, each with its own adaptive differential
element. Supervise zone differential elements by using
the independent check zones to monitor all incoming
sources and outgoing feeders on a per-phase basis.
During an internal fault, the check zone differential
element will assert. During an external fault, the check
zone element will remain deasserted.
Differential Protection
The SEL-487B includes six independent current differ-
ential elements. Operating time for internal faults,
including high-speed output contact closure, is less than
one cycle. Figure 8 shows an example of an internal fault
and differential element operation.
Table 1 Conditions for Automatic Terminal Assignment
Example of
Condition
SELOGIC
Control
Equation
Result
Consider
Terminal in
Protection
Calculations?
Issue
Trip?
Disconnect is open False No No
Disconnect is closed True Yes Yes
Busbar Primary
Fault Current
Circuit
Breaker Open
End-Zone
Fault
52
F1
Busbar Primary
Fault Current
End-Zone
Fault
52a Auxiliary
Contact
52
F1

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
6
Figure 8 Differential Element Operation in Less Than
One Cycle for Internal Faults
Each of the differential elements provides the following:
➤Fast operating times for all busbar faults
➤Security for external faults with heavy CT satura-
tion
➤Security with subsidence current present
➤High sensitivity for busbar faults
➤Minimum delay for faults evolving from external
to internal faults
Figure 9 shows a block diagram of one of the six
differential protection elements.
Figure 9 External Fault Detection Logic Increases
Differential Element Security
CT saturation is one of the main factors to address when
considering relay security. Because of the high sampling
rate, the fault detection logic detects external faults in
less than 2 ms by comparing the rate of change of the
restraint and operating currents. Following the detection
of an external fault, the relay enters a high-security
mode, during which it dynamically selects a higher slope
for the differential elements (see Figure 9). Figure 10
shows an external fault with heavy CT saturation,
without differential element operation.
Figure 10 Differential Element Does Not Operate for
External Fault With Heavy CT Saturation
CT Supervision
Open or shorted current transformers produce equal and
opposite changes in restraint and operate current. The
advanced CT supervision in the SEL-487B monitors dif-
ferential zone restraint and operating current for these
changes, to provide rapid and dependable detection of
open or shorted CT conditions. Use the CT supervision
logic in zone trip equations.
Voltage Elements
Voltage elements consist of two levels of phase under-
(27) and overvoltage (59) elements and two levels of
negative- (59Q) and zero-sequence (59N) overvoltage
elements, based on one set of three analog voltage quan-
tities. Table 2 provides a summary of the voltage ele-
ments.
Breaker Failure Protection
The SEL-487B includes complete breaker failure protec-
tion, including retrip, for each of the 21 terminals.
Because some applications require external breaker fail-
ure protection, set the SEL-487B to external breaker fail
and connect the input from any external breaker failure
relay to the SEL-487B; you can set any terminal to either
internal or external breaker failure protection.
Time (sec)
Current (Amps)
00.05 0.10 0.15 0.20
0
5
–5
0
0
5
10
15
20
Fault Inception
Internal
Fault Detection (<1 cycle)
IO1
IO2
Fault
Detection Logic
Differential Element Trip
Output
Internal
Fault
External Fault
CT
Supervision
Slope 1
Slope 2
Current
Input I01
Current
Input I18
IOP
IRT
Table 2 Voltage Elements
Element Quantity Levels
Undervoltage Phase Two levels
Overvoltage Phase, negative-,
and zero-sequence Two levels
–50
0
50
100
–150
0
–100
–50
0
50
Current (Amps)
0.05 0.10 0.15 0.20
Time (sec)
(No Differential
Element Operation)
IO1
IO2
Internal
Fault Detection

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
7
Figure 11 Open-Phase Detection Reduces Breaker
Failure Coordination Time
High-speed, open-pole detection logic detects open-pole
conditions in less than 0.75 cycle, reducing breaker
failure coordination times as in Figure 11.
Overcurrent Elements
Choose from 10 time-overcurrent curves (Table 3) for
each of the 21 current inputs. Each torque-controlled
time-overcurrent element has two reset characteristics.
One choice resets the elements if current drops below
pickup for one cycle, while the other choice emulates the
reset characteristic of an electromechanical induction
disk relay.
Each terminal also includes instantaneous and definite-
time overcurrent elements. These overcurrent elements
are summarized in Table 4.
Disconnect Status Monitor
Figure 12 shows the disconnect open and close contact
relationship. During the open-to-close operation, the 89b
contact must open (disconnect is CLOSED) during the
transition zone before the main contact arcing starts. The
89a contact must close in this transition zone.
During the close-to-open operation, the 89b contact must
close during the transition zone after the main contact
arcing is extinguished (disconnect is OPEN), as shown in
Figure 12. The 89a contact must open in this transition
zone.
Table 5 shows the four possible disconnect auxiliary
contact combinations and how the relay interprets each
combination.
Figure 12 Disconnect Switch Auxiliary Contact Requirements for the Zone Selection Logic; No CT Switching Required
Table 3 Time-Overcurrent Curves
US IEC
Moderately Inverse Standard Inverse
Inverse Very Inverse
Very Inverse Extremely Inverse
Extremely Inverse Long-Time Inverse
Short-Time Inverse Short-Time Inverse
Subsidence
Open-Phase
Detection
Table 4 Overcurrent Elements per Terminal
Element Quantity Levels
Instantaneous Overcurrent Phase One level
Definite-Time Overcurrent Phase One level
Table 5 Disconnect Status as a Function of the
Auxiliary Contacts
89a 89b Relay 89 Status
Interpretation
00closed
0 1 open
10closed
11closed
Closed
89a Status
Open Open
Closed Closed
89b Status
Open
Disconnect Switch Starts to Close
Disconnect Switch Starts to Open
Open
Intermediate
Position
Intermediate
Position
Arcing Closed Arcing Open
Closing
qw
q
w
Opening
Main Contact Status
Intermediate
Position
Intermediate
Position

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
8
Tie-Breaker Configurations
Figure 13, Figure 14, and Figure 15 show three tie-
breaker schemes:
➤Two CTs configured in overlap (Figure 13)
➤A single CT with two cores configured in overlap
(Figure 14)
➤Two CTs configured with a differential element
across the breaker (Figure 15)
Configure any one of these schemes without using
external auxiliary relays. Figure 13 and Figure 14 also
show the tie breaker closing onto an existing fault, F1.
The SEL-487B includes tie-breaker logic to prevent the
loss of both zones for this fault.
T
Figure 13 Two CTs Configured in Overlap
Figure 14 A Single CT With Two CT Cores Configured in
Overlap
Configure one of the differential zones as a differential
across the tie breaker. This arrangement has the
following advantages:
➤Both main zones are secure for a fault between the
tie breaker and the CT.
➤Only one main zone is tripped for a fault between
the tie breaker and the CT (as opposed to both
main zones with an overlapping tie-breaker
arrangement).
Figure 15 Two CTs Configured With a Differential
Element Across the Breaker
Six Independent Settings Groups
Increase Operation Flexibility
The relay stores six settings groups. Select the active set-
tings group by control input, command, or other pro-
grammable conditions. Use these settings groups to
cover a wide range of protection and control contingen-
cies.
Selectable settings groups make the SEL-487B ideal for
applications requiring frequent settings changes and for
adapting the protection to changing system conditions.
Selecting a group also selects logic settings. Program
group logic to adjust settings for different operating
conditions, such as station maintenance, seasonal
operations, and emergency contingencies.
Applications
Figure 16 shows a station with double bus sections and a
bus tie breaker. Use a single SEL-487B for this
application.
For stations with breaker-and-a-half busbar configuration
and seven or fewer connections to either busbar, use an
SEL-487B for each busbar, as in Figure 17.
52
Bus 1 Bus 2
B1
F1
B2
Bus 1 Bus 2
B1
B2
52
F1
52
Bus 1 Bus 2
B1 B2
87

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
9
Figure 16 Single SEL-487B Protecting Double Bus Sections With Bus Tie Breaker
Figure 17 Two Single SEL-487B Relays Protecting the Two Busbars in a Breaker-and-a-Half Busbar Configuration
For stations with 10 to 21 terminals (Figure 18), use
three separate SEL-487B relays and wire analog current
inputs from A-, B-, and C-phases separately into each
relay. This way, each of the 21 analog current inputs in
each relay measures only one phase, with six dedicated
zones of protection available. Each relay operates
independently; the only communication among relays is
MIRRORED BITS®communication and IRIG-B. In this
application, operators have complete flexibility because
they can close any disconnect at any time without
compromising the busbar protection. This is possible
Zone 1 Zone 2
52 52
52
52 52
3 3 3 3 3 3
400/5
FDR_1 FDR_2 FDR_3 FDR_4
800/5
2000/5 2000/5
4000/53000/5
SEL-487B
Bus 2
Bus 1
3
3
3
3
3
3
52
52
52
52
52
52
52
52
52
SEL-487B
SEL-487B
•
•
•
•
•
•
4000/5
2000/5
FDR_1
FDR_8
FDR_2
FDR_9
FDR_7
FDR_14
2000/5
1000/5
400/5
200/5

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
10
because the relay dynamically computes the station
connection replica by using the patented zone-selection
algorithm.
Figure 18 shows a busbar layout consisting of two main
busbars and a transfer bus, one busbar coupler, and 20
terminals.
Figure 18 Three SEL-487B Relays Protect Two Main Busbars and a Transfer Busbar, Bus Coupler, and 20 Terminals
Optimize your SEL-487B by protecting both HV and LV
busbars with three relays. Figure 19 shows two HV
busbars and two LV busbars. Use of four zones for the
four busbars (two HV and two LV) still leaves two zones
available in each relay. We can configure independent
check zones for HV and LV bus protection supervision.
Bus 1
Bus 2
Transfer Bus
1
52
400/5
1
52
800/5
FDR_1
1
52
4000/5
FDR_20
SEL-487B
SEL-487B
SEL-487B
(C-Phase)
(B-Phase)
(A-Phase)

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
11
Figure 19 Three SEL-487B Relays Protect Both HV and LV Busbars
Bus 1
Bus 2
52
400/5
400/5
800/5 400/5 800/5 800/5
52 52 52 52
Bus 3
Bus 4
52
400/5
400/5
800/5
4000/5
1600/5
52
52
400/5
52
52
FDR_1
FDR_4
TRFR_1 TRFR_2
FDR_2
FDR_12
FDR_3
3-Phase PT
Check Zone HV
Check Zone LV
HVCTS
LVCTS
HVCTS
LVCTS
HVCTS
LVCTS
SEL-487B
SEL-487B
SEL-487B

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
12
Time Synchronization, Automation, and Communication
Time Synchronization
To synchronize the relays in a three-relay application,
use the unique IN and OUT IRIG-B connectors installed on
each relay for the IRIG-B signal. Referring to the
External Source connections in Figure 20, connect the
IRIG-B signal to the IN connector of Relay A to update
the time. Connect the OUT connector of Relay A to the IN
connector of Relay B to update the time in Relay B. Use
a similar connection between Relay B and Relay C to
update the time in Relay C. In the absence of an external
IRIG-B signal, connect the relays as shown by the
Internal Source connections in Figure 20. Connected this
way, Relay B and Relay C synchronize to the internal
clock of Relay A. The event reports the different relays
generate are time-stamped to within 10 µs of each other.
Figure 20 Time Synchronize SEL-487B Relays With or
Without External Clock Source
Precision Time Protocol (PTP)
Time Synchronization
In addition to IRIG-B, the relay can be time synchro-
nized through the Ethernet network using IEEE 1588
Precision Time Protocol, version 2 (PTPv2). When con-
nected directly to a grandmaster clock providing PTP at
1-second sync intervals, the relay can be synchronized to
an accuracy of ±100 ns. The relay is capable of receiving
as many as 32 sync messages per second.
Figure 21 Example PTP Network
SNTP Time Synchronization
Use simple network time protocol (SNTP) to cost-
effectively synchronize SEL-487B relays equipped with
Ethernet communication to within ±1 ms with no time
source delay. Use SNTP as a primary time source, or as a
backup to a higher accuracy IRIG-B time input to the
relay.
Figure 22 SNTP Diagram
Automation
Time-Domain Link (TiDL) Technology
The SEL-487B supports remote data acquisition through
use of an Axion with a technology known as TiDL. The
Axion provides remote analog and digital data over an
IEC 61158 EtherCAT TiDL network. This technology
provides very low and deterministic 1.5 ms latency over
a point-to-point architecture. The SEL-487B Relay can
receive as many as eight fiber links from as many as eight
Axion remote data acquisition nodes.
The relay supports a number of fixed topologies. The
relay maps the voltage and current inputs from the Axion
to existing analog quantities in the SEL-487B Relay
IN OUT
IN OUT
IN OUT
IN OUT
IN OUT
IN OUT
SEL-487B SEL-487B
SEL-487B SEL-487B
SEL-487B SEL-487B
Relay A Relay A
Relay B Relay B
Relay C Relay C
IRIG-B
Clock Receiver
External Source Internal Source
IRIG-B IRIG-B
SEL-487B SEL-487E
SEL-411L SEL-421 SEL-451
GPS
SEL-2488
SEL-2740M
SEL-487E SEL-487E SEL-487E SEL-487E
SEL-3354
SEL-2725
SEL-2401

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
13
based on the connected topology. This limits the number
of settings and makes converting an existing system to
TiDL easy. Figure 23 shows a sample TiDL topology.
The SEL-487B Instruction Manual shows all supported
topologies.
Figure 23 Sample Topology
Flexible Control Logic and Integration
Features
Use the SEL-487B control logic to replace the
following:
➤Traditional panel control switches
➤RTU-to-relay wiring
➤Traditional latching relays
➤Traditional indicating panel lights
Eliminate traditional panel control switches with 32 local
control points. Set, clear, or pulse local control points
with the front-panel pushbuttons and display. Program
the local control points to implement your control
scheme via SELOGIC control equations. Use the same
local control points for functions such as taking a
terminal out of service for testing.
Eliminate RTU-to-relay wiring with 96 remote control
points. Set, clear, or pulse remote control points via serial
port commands. Incorporate the remote control points
into your control scheme via SELOGIC control equations.
Use remote control points for SCADA-type control
operations (e.g., trip, settings group selection).
Replace traditional latching relays for such functions as
remote control enable with 32 latching control points.
Program latch set and latch reset conditions with
SELOGIC control equations. Set or reset the latch control
points via control inputs, remote control points, local
control points, or any programmable logic condition. The
relay retains the states of the latch control points after
powering up following a power interruption.
Replace traditional indicating panel lights and switches
with either of these HMIs:
➤Standard HMI: 16 latching target LEDs and 8 pro-
grammable pushbuttons with LEDs.
➤Expanded HMI option: 24 tricolor latching target
LEDs and 12 programmable pushbuttons.
Define custom messages to report analog and Boolean
power system or relay conditions on the large format
LCD. Control displayed messages via SELOGIC control
equations by driving the LCD display via any logic point
Port
6A
6B
6C
6D
6E
6F
6G
Analogs
I01, I02, I03,V01, V02, V03
I04, I05, I06
I07, I08, I09
I10, I11, I12 (optional)
I13, I14, I15 (optional)
I16, I17, I18 (optional)
I19, I20, I21 (optional)
I01, I02, I03
V0,
V1,
V2
Feeder 1
I04, I05, I06
Feeder 2
I07, I08, I09
Feeder 3
I10, I11, I12
Feeder 4
SEL Axion SEL Axion SEL Axion SEL Axion
I13, I14, I15
Line 1
I16, I17, I18
Line 2
I19, I20, I21
Line 3
SEL Axion SEL Axion SEL Axion
SEL Relay
Control House
Substation Yard

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
14
in the relay. Use any of the dozens of measured or
calculated analog values in the relay to create display
messages for system metering on the front-panel LCD.
SELOGIC Control Equations With
Expanded Capabilities and Aliases
Expanded SELOGIC control equations (Table 6) put relay
logic in the hands of the protection engineer. Assign the
relay inputs to suit your application, logically combine
selected relay elements for various control functions, and
assign outputs to your logic functions. Programming
SELOGIC control equations consists of combining relay
elements, inputs, and outputs with SELOGIC control
equation operators. You can use any of the relay internal
variables (Relay Word bits) in these equations. For
complex or unique applications, these expanded
SELOGIC control equation functions allow superior
flexibility. Add programmable control functions to your
protection and automation systems. New functions and
capabilities enable you to use analog values in
conditional logic statements. Use the new alias capability
to assign more meaningful relay variable names. This
improves the readability of customized programming.
Use as many as 200 aliases to rename any digital or
analog quantity. The following is an example of possible
applications of SELOGIC control equations using aliases:
=>>SET T <Enter>
1: PMV01,THETA
(assign the alias “THETA” to math variable PMV01)
2: PMV02,TAN
(assign the alias “TAN” to math variable PMV02)
=>>SET L <Enter>
1: # CALCULATE THE TANGENT OF THETA
2: TAN:=SIN(THETA)/COS(THETA)
(use the aliases in an equation)
ACSELERATOR QuickSet SEL-5030
Software
Use the ACSELERATOR QuickSet®SEL-5030 Software
to develop settings and busbar configurations offline.
The system automatically checks interrelated settings
and highlights out-of-range settings. You can transfer
settings you create offline by using a PC
communications link with the SEL-487B. The relay
converts event reports to oscillograms with time-
coordinated element assertion and phasor diagrams. The
ACSELERATOR QuickSet interface supports Server 2008,
Windows®7 and Windows 8 operating systems, and can
be used to open COMTRADE files from SEL and other
products. You can also use ACSELERATOR QuickSet to
design application-specific settings templates and then
store the templates in non-volatile memory within the
relay for trouble-free retrieval.
Figure 24 Settings Templates
MIRRORED BITS Communications
The SEL patented MIRRORED BITS technology provides
bidirectional relay-to-relay digital communication.
Figure 25 shows two SEL-487B relays with MIRRORED
BITS communications using SEL-2815 Fiber-Optic
Transceivers. In the SEL-487B, MIRRORED BITS com-
munications can operate simultaneously on any two
serial ports. This bidirectional digital communication
creates additional outputs (transmitted MIRRORED BITS)
and additional inputs (received MIRRORED BITS) for each
serial port operating in the MIRRORED BITS communica-
tions mode.
Communicated information can include digital, analog,
and virtual terminal data. Virtual terminal allows
operator access to remote relays through the local relay.
You can use this MIRRORED BITS protocol to transfer
information between stations to enhance coordination
and achieve faster tripping.
Ta b l e 6 E x p a n d e d S E L OGIC Control Equation Operators (Sheet 1 of 2)
Operator Type Operators Comments
Edge Trigger R_TRIG, F_TRIG Operates at the change of state of an internal function.
Math Functions SQRT, LN, EXP, COS, SIN, ABS,
ACOS, ASIN, CEIL, FLOOR, LOG Combine these to calculate other trigonometric functions, i.e., TAN: = SIN(THETA)/COS(THETA).
Arithmetic *, /, +, - Uses traditional math functions for analog quantities in an easily programma-
ble equation.
Comparison <, >, <=, >=,=, <> Compares the values of analog quantities against predefined thresholds or
against each other.
Boolean AND, OR, NOT Combines variables, and inverts the status of variables.

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
15
Figure 25 Integral Communication Provides Secure Protection, Monitoring, and Control as Well as Terminal Access to
Both Relays Through One Connection
Communications Features
The SEL-487B offers the following communications fea-
tures:
➤Four independent EIA-232 serial ports
➤Full access to event history, relay status, and meter
information from the communications ports
➤Settings and group switching password control
➤SCADA interface capability including FTP, IEC
61850, and DNP3 LAN/WAN (via optional inter-
nally mounted Ethernet card), and DNP3 Level 2
Slave (via serial port)
The relay does not require special communications
software. You need only ASCII terminals, printing
terminals, or a computer supplied with terminal
emulation and a serial communications port. Table 7
provides a synopsis of the communications protocols in
the SEL-487B.
Ethernet Card
The SEL-487B provides Ethernet communications capa-
bilities with the optional Ethernet card. This card mounts
directly in the relay. Use Telnet applications for easy ter-
minal communication with SEL relays and other devices.
Transfer data at high speeds (10 Mbps or 100 Mbps) for
fast file uploads. The Ethernet card communicates using
FTP applications for easy and fast file transfers. Choose
Ethernet connection media options for primary and
stand-by connections:
➤10/100BASE-T Twisted Pair Network
➤100BASE-FX Fiber-Optic Network
Communicate using IEC 61850 Logical Nodes and
GOOSE Messages, or DNP3 LAN/WAN.
Telnet and FTP
Order the SEL-487B with Ethernet communications and
use the built-in Telnet and File Transfer Protocol (FTP)
that come standard with Ethernet to enhance relay
communications sessions. Use Telnet with the ASCII
interface to access relay settings, and metering and event
reports remotely. Use FTP to transfer settings files to and
from the relay via the high-speed Ethernet port.
DNP3 LAN/WAN
The DNP3 LAN/WAN option provides the SEL-487B
with DNP3 Level 2 slave functionality over Ethernet.
You can configure custom DNP3 data maps for use with
specific DNP3 masters.
Precision Time Protocol (PTP)
An Ethernet card option with Ports 5A and 5B populated
provides the ability to accept IEEE 1588 Precision Time
Protocol, version 2 (PTPv2) for data time
synchronization. Optional PTP support includes both the
Default and Power System (C37.238-2011) PTP Profiles.
Precedence Con-
trol ( ) Allows up to 14 sets of parentheses.
Comment # Provides for easy documentation of control and protection logic.
Ta b l e 6 E x p a n d e d S E L OGIC Control Equation Operators (Sheet 2 of 2)
Operator Type Operators Comments
Fiber-Optic Cable
TX
RX
TX
RX
SEL-2815 SEL-2815
Station A Station B
Digital, Analog, and Virtual Terminal Data
Network
SEL-487B SEL-487B
Other
Relays Other
Relays
•
•
•
•
•
•

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
16
Parallel Redundancy Protocol (PRP)
This protocol is used to 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.
HTTP Web Server
When equipped with Ethernet communications, the relay
can serve read-only web pages displaying certain
settings, metering, and status reports. As many as four
users can access the embedded HTTP server
simultaneously.
IEC 61850 Ethernet
Communications
IEC 61850 Ethernet-based communications provide
interoperability among intelligent devices within the
substation. Logical nodes using IEC 61850 allow
standardized interconnection of intelligent devices from
different manufacturers for monitoring and control of the
substation. Reduce wiring among various manufacturers’
devices and simplify operating logic with IEC 61850.
Eliminate system RTUs by streaming monitoring and
control information from the intelligent devices directly
to remote SCADA client devices.
You can order the SEL-487B with embedded IEC 61850
protocol operating on 10/100 Mbps Ethernet. EC 61850
Ethernet protocol provides relay monitoring and control
functions including:
➤As many as 128 incoming GOOSE messages. The
incoming GOOSE messages can be used to control
up to 256 control bits in the relay with <3 ms
latency from device to device. These messages
provide binary control inputs and analog values to
the relay for high-speed control functions and
monitoring.
➤As many as eight outgoing GOOSE messages. You
can configure outgoing GOOSE messages for
Boolean or analog data. Boolean data and desig-
nated remote analog outputs are provided with
<3 ms latency from device to device. Apply outgo-
ing GOOSE messages for high-speed control and
monitoring of external breakers, switches, and
other devices.
➤IEC 61850 Data Server. The SEL-487B, equipped
with embedded IEC 61850 Ethernet protocol, pro-
vides data according to predefined logical node
objects. Each relay supports as many as seven
simultaneous client associations. Relevant Relay
Word bits are available within the logical node
data, so you can use the IEC 61850 data server in
the relay to monitor the status of relay elements,
inputs, outputs, or SELOGIC control equations.
➤Configuration of up to 256 Virtual Bits within
GOOSE messaging to represent a variety of Bool-
ean values available within the relay. The Virtual
Bits the relay receives are available for use in
SELOGIC control equations.
➤As many as 64 Remote analog outputs that you can
assign to virtually any analog quantity available in
the relay. You can also use SELOGIC math vari-
ables to develop custom analog quantities for
assignment as remote analog outputs. Remote ana-
log outputs using IEC 61850 provide peer-to-peer
transmission of analog data. Each relay can receive
up to 256 remote analog inputs and use those
inputs as analog quantities within SELOGIC control
equations.
MMS File Services
This service of IEC 61850 MMS provides support for
file transfers completely within an MMS session. All
relay files that can be transferred via FTP can also be
transferred via MMS file services.
MMS Authentication
When enabled via a setting in the CID file, the relay will
require authentication from any client requesting to
initiate an MMS session. The client request must be
accompanied by the 2AC level password.
ACSELERATOR Architect
USE ACSELERATOR Architect®SEL-5032 Software to
manage the logical node data for all IEC 68150 devices
on the network. This Microsoft®Windows®-based
software provides easy-to-use displays for identifying
and binding IEC 61850 network data among logical
nodes using IEC 61850-compliant Configured IED
Description (CID) files. ACSELERATOR Architect uses
CID files to describe the data the IEC 61850 logical node
will provide within each relay.
Table 7 Open Communications Protocol (Sheet 1 of 2)
Type Description
ASCII Plain-language commands for human and simple machine communication.
Use for metering, setting, self-test status, event reporting, and other functions.
Compressed ASCII Comma-delimited ASCII data reports allow external devices to obtain relay data in an appropriate for-
mat for direct import into spreadsheets and database programs. Data are checksum protected.

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
17
Additional Features
Front-Panel Display
Figure 26 and Figure 27 show close-up views of the stan-
dard SEL-487B front panel. The standard front panel
includes a 128 x 128 pixel (76.2 mm x 76.2 mm or 3 in x
3 in) LCD screen; 18 LED target indicators; and eight
direct-action control pushbuttons with indicating LEDs
for local control functions. You can use easily changed
slide-in labels to custom configure target and pushbutton
identification. Figure 28 shows the expanded SEL-487B
front panel. The optional expanded SEL-487B front
panel provides the same LCD screen with more latching
target LEDs and programmable pushbuttons. When you
order the optional front panel, the SEL-487B provides 24
tricolor LEDs and 12 programmable pushbuttons with
indicating LEDs. Use the capabilities of the expanded
SEL-487B front panel to integrate a wide range of con-
trol and system annunciation functions.
Figure 26 Front-Panel Display and Pushbuttons
Figure 27 Standard Front-Panel Configurable Labels,
Programmable Targets and Controls for Customized
Applications
Figure 28 Optional Front Panel With 24 Tricolor Target
LEDs and 12 Pushbuttons
The LCD shows event, metering, setting, and relay self-
test status information. Control the LCD through the
navigation pushbuttons (Figure 26), automatic messages
the relay generates, and user-programmable display
points. The rotating display scrolls through any active,
nonblank display points. If none are active, the relay
scrolls through displays of the differential operating and
restraint quantities, the terminals in each enabled zone,
and the primary current and voltage values. Each display
remains for five seconds before the display continues
Extended SEL Fast Meter, SEL
Fast Operate, and SEL Fast SER Binary protocol for machine-to-machine communication. Quickly updates SEL communications processors, RTUs, and other substation devices with metering information, relay element, I/O status,
time-tags, open and close commands, and summary event reports. Data are checksum protected.
Ymodem Support for reading event, settings, and oscillography files.
Optional DNP3 Level 2 Slave Distributed Network Protocol with point remapping. Includes access to metering data, protection
elements, contact I/O, targets, SER, relay summary event reports, and settings groups.
MIRRORED BITS SEL protocol for exchanging digital and analog information among SEL relays and for use as
low-speed terminal connection.
Optional FTP and Telnet Available with the optional Ethernet card. Use Telnet to establish a terminal-to-relay connection over
Ethernet. Use FTP to move files in and out of the relay over Ethernet.
IEC 61850 Ethernet-based international standard for interoperability among intelligent devices in a substation.
SNTP Ethernet-based simple network time protocol for Ethernet-based time synchronization among relays.
Table 7 Open Communications Protocol (Sheet 2 of 2)
Type Description

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
18
scrolling. Any message the relay generates because of an
alarm condition takes precedence over the rotating
display.
Status and Trip Target LEDs
The SEL-487B standard front panel includes 16 pro-
grammable status and trip target LEDs as well as eight
programmable direct-action control pushbuttons on the
front panel. The optional SEL-487B expanded front
panel provides 24 programmable tricolor LED indicators
and 12 direct action control pushbuttons. These targets
are shown in Figure 27 and Figure 28 and explained in
Table 8.
Configurable Front-Panel Labels
Customize the SEL-487B front panel to fit your needs.
Use SELOGIC control equations and slide-in configurable
front-panel labels to change the function and identifica-
tion of target LEDs, operator control pushbuttons, and
pushbutton LEDs. The blank slide-in label set is included
with the SEL-487B. Functions are simple to configure
using ACSELERATOR QuickSet.
You can use templates supplied with the relay or hand-
written on blank labels supplied with the relay to print
labels.
Control Inputs and Outputs
The basic SEL-487B (main board only) includes five
independent and two common inputs, and two standard
Form A, three high-current interrupting Form A, and
three Form C standard outputs, as in Figure 29.
Figure 29 Form A and Form C Output Contacts
Add as many as four interface boards with the following
additional input/output (I/O) per interface board:
➤six independent inputs
➤eighteen common inputs (in two groups of nine)
➤six high-speed, high-interrupting Form A outputs
➤two standard Form A output contacts
The relay is available in either 9U or 7U chassis heights.
The 9U chassis supports as many as four INT4 interface
boards, while the 7U chassis option supports as many as
two INT4 interface boards. Assign the control inputs for
disconnect auxiliary contact status and breaker auxiliary
contact status. Set the input debounce time independently
for each input or as a group. You can use SELOGIC
control equations to program each control output.
Table 8 Description of Factory Default Target LEDs
Ta rg e t L E D Function
87 (DIFF) Differential element trip
BKR FAIL Breaker failure protection trip
ZONE 1 Fault was in Zone 1
ZONE 2 Fault was in Zone 2
ZONE 3 Fault was in Zone 3
ZONE 4 Fault was in Zone 4
ZONE 5 Fault was in Zone 5
Standard Front-Panel LED Functions
ZONE 6 Fault was in Zone 6
50 Instantaneous overcurrent element trip
51 Time-overcurrent element trip
CT ALARM Current transformer alarm
87 BLOCKED Differential element blocked
TOS Any terminal out of service
89 IN PROG Disconnect operation in progress
89 ALARM Disconnect failed to complete operation
PT ALARM Potential transformer alarm
Expanded Front-Panel LED Functions
27 Phase Undervoltage
59 Phase Overvoltage
V01 ON Phase Voltage V01 Present
V02 ON Phase Voltage V02 Present
V03 ON Phase Voltage V03 Present
BUS FAULT Any Bus Zone Internal Fault
52 ALARM Any System Breaker Failure Alarm
IRIG LOCK IRIG Clock Input Lock
Form CForm A

Schweitzer Engineering Laboratories, Inc. SEL-487B Data Sheet
19
Monitoring and Metering
Access a range of useful information in the relay with the
metering function. Metered quantities include
fundamental primary and secondary current and voltage
magnitudes and angles for each terminal. Secondary
quantities also include the PT ratio and CT ratio of each
terminal. Zone information displays primary current and
voltage magnitudes and angles for each terminal and also
includes the polarity of each CT and the bus-zones in
each of the protective zones at the station. The same
information is available in secondary quantities and
includes both the CT ratio and polarity. Differential
metering shows the operating and restraint currents, as
well as the reference current, for each zone.
Event Reporting and Sequential
Events Recorder (SER)
Event Reports and Sequential Events Recorder features
simplify post-fault analysis and help improve your
understanding of both simple and complex protective
scheme operations. These features also aid in testing and
troubleshooting relay settings and protection schemes.
Oscillography and Event Reporting
In response to a user-selected internal or external trigger,
the voltage, current, and element status information con-
tained in each event report confirms relay, scheme, and
system performance for every fault. The SEL-487B pro-
vides sampling rates as fast as 8 kHz for analog quanti-
ties in a COMTRADE file format. It also provides 12
sample-per cycle and 4 sample-per-cycle event reports
that sample filtered analog quantities. The relay stores in
nonvolatile memory as much as 5 seconds of 8 kHz event
data and as much as 24 seconds of 1 kHz event data.
Relay settings operational in the relay at the time of the
event display at the end of each filtered event report.
Use event report settings in the relay to assign up to 20
analog quantities for inclusion in the filtered event
reports. Use relay-calculated values such as check zone
operate and restraint current, or use SELOGIC automation
or protection math variables.
Each SEL-487B provides event reports for analysis with
software such as the ACSELERATOR Analytic Assistant®
SEL-5601 Software. With ACSELERATOR Analytic
Assistant, you can display events within the same time-
stamp range from as many as three different relays in one
window to make fault analysis easier and more
meaningful. Because different relays time-stamp events
with values from their individual clocks, be sure to time
synchronize the SEL-487B with an IRIG-B clock input
before using this feature (see Figure 20). Figure 30
shows the SEL-5601 software screen with three events
selected.
Figure 30 Software Screen After Reading an Event
From Three Different Relays
Select from each event the information of interest, and
combine this selection into a single window. Figure 31
shows the combination of the tie-breaker A-phase current
(Relay 1), B-phase current (Relay 2), and C-phase
current (Relay 3) in one window.
Table 9 Flexible Metering Capabilities and Large Screen
Display Eliminate Need for Panel Instruments
Capabilities Description
V01, V02, V03 Fundamental phase voltage magnitude and
angle in primary and secondary values
I01, I02, . . ., I21 Fundamental phase current magnitude and
angle in primary and secondary values
IOP, IRT, IREF Operating and restraint currents for each
zone, check zone, and the reference cur-
rent
Bus Zones in
Protection Zone nNames of the bus-zones in Protection Zone n(where n= 1 to 6)
PTR, CTR PT ratio and CT ratio for each terminal
POL Polarity of each CT

SEL-487B Data Sheet Schweitzer Engineering Laboratories, Inc.
20
Figure 31 Information From Three Relays Combined
Into a Single Window
Event Summary
Each time the relay generates a standard event report, it
also generates a corresponding Event Summary. This is a
concise description of an event that includes the follow-
ing information:
➤Relay/terminal identification
➤Event date and time
➤Event type
➤Event number
➤Time source
➤Active settings group
➤Targets asserted during the fault
➤Current magnitudes and angles for each terminal
➤Voltage magnitudes and angles
➤Terminals tripped for this fault
➤Bus-zones in Protection Zone n(n= 1–6)
With an appropriate setting, the relay will send an Event
Summary in ASCII text automatically to one or more
serial ports for each triggering of an event report.
Sequential Events Recorder (SER)
Use this feature to gain a broad perspective of relay ele-
ment operation. Items that trigger an SER entry are
selectable and can include as many as 250 monitoring
points such as input/output change of state and element
pickup/dropout. The relay SER stores the latest 1000
events.
Substation Battery Monitor for
DC Quality Assurance
The SEL-487B measures and reports the substation bat-
tery voltage for one battery system. The relay provides
alarm, control, and dual ground detection for one battery
and charger. The battery monitor includes warning and
alarm thresholds that you can monitor with the
SEL-3530 Real-Time Automation Controller (RTAC)
and use to trigger messages, telephone calls, or other
actions. The relay reports measured dc voltage in the
METER display via serial or Ethernet port communica-
tions, on the LCD, and in the Event Report. Use the event
report data to see an oscillographic display of the battery
voltage. Monitor the substation battery voltage drops
during trip, close, and other control operations.