SEL-487B

SEL-487B
Bus Differential and Breaker Failure Relay
A Powerful Solution for Busbar Differential Protection
Select the SEL-487B for the differential protection of busbar
systems with up to 18 terminals.
Features and Benefits
■Protection
■Automation and Control
Protect bus systems with up to 18 terminals (54 CTs), 6 protection
zones, and 1 additional independent check zone. To optimize
protection security, the check zone supervises up to 6 zones,
and a patented open CT detection algorithm blocks potential
misoperations during open or shorted CT conditions. Differential
and directional current elements provide increased security and
fast fault detection. Reduce protection costs with built-in breaker
failure protection.
■Flexibility
Reduce project costs and simplify interconnect wiring using
multiple communications protocols and ports. Configurable
operator controls and simplified variable naming provide added
power to SELogic® control equations.
■Monitoring and Metering
Provide accurate, timely monitoring and metering of busbar, feeder,
and substation signals. Terminal currents, breaker and disconnect
positions, station dc voltage levels, and three-phase voltage are
continuously monitored and updated.
Implement different ratio CTs and nondedicated CTs with the
SEL-487B. Eliminate complex wiring by using CT ratios that differ
by up to a factor of 10:1. Take advantage of the same CTs for
differential protection, metering, backup relaying, and other
functions.
Making Electric Power Safer, More Reliable, and More Economical ®
Functional Overview
HMI
RTU
DFR
SBM
SER
LGC
MET
Operator
Interface
Remote
Terminal Unit
Event Reports
Station
Battery Monitor
Sequential
Events Recorder
Expanded
SELOGIC®
High-Accuracy
Metering
85
RIO
SEL MIRRORED BITS®
S
16E C
Access Security
* Optional Functions
4
EIA-232
2
Ethernet*
(Copper or Fiber-Optic)
1
IRIG-B
Integrate With Ethernet Networks
Apply SEL-487B Relays with Ethernet directly to a local network or
through an SEL communications processor.
• Use DNP3 LAN/WAN or Modbus TCP to quickly send information
through your networks.
• Provide information to the right people for improved system
performance.
• Transfer data with high-speed Ethernet for fast HMI updates and
file uploads.
• Use popular Telnet applications for easy terminal communication
with SEL relays and other devices.
• Combine IEC 61850 technology, Ethernet network, and the
SEL-487B for the fastest overall performance of IEC 61850
relays for substation automation and control.
• Access basic relay information on a standard Ethernet network
with the built-in web server. View relay status, Sequential Events
Recorder (SER) reports, metering information, and settings. Web
server access requires relay password and is limited to read-only
viewing of information.
• Simplify wiring and installation by receiving a time signal over
existing Ethernet networks. SNTP makes a good backup to more
accurate IRIG-B time synchronization.
SEL-3351
Network
SEL-2725
SEL-351
SEL-351
SEL-2032
SEL-351
Typical Ethernet network configuration.
2
SEL-487B
Differential Protection
The SEL-487B includes six independent current differential elements.
Each SEL-487B differential element provides:
• Fast operate times for all busbar faults
• Security for external faults with heavy CT saturation
• Security with subsidence current present
• High sensitivity to busbar faults
• Minimum delay for faults evolving from external to internal
High-Security Operate Slope
Standard Operate Slope
Restraint Zone
CT Supervision
Current
Input I01
20
Current (amperes)
Trip
Output
2
pe
Slo e 1
Slop
15
10
IOP Differential Element
Fault Inception
Current
Input I18
IRT
5
0
External Fault
IO1
5
0
IO2
Fault
Detection Logic
–5
0
Internal
Fault Detection
Internal
Fault
(<1 cycle)
Time
External faults are detected by directional elements within the relay.
When an external fault is detected, the relay enters a high-security
mode and dynamically selects a higher slope for the differential
elements, making them more secure during the fault.
Differential element operation in less than one cycle for internal faults,
including high-speed contact closure.
100
50
0
IO1
CT Supervision
For each zone, sensitive current differential elements detect
differential current resulting from a differential element that is
not well balanced (i.e., wrong CT ratios). If the conditions persist
for longer than a user-specified delay, the element alarms and
can be used to generate an external alarm and/or block the
zone.
Current (amperes)
–50
50
0
IO2
–50
Voltage Element
Supervise current differential tripping within the relay using
voltage elements. Three separate voltage elements consist of
two levels of phase under- and overvoltage elements and two
levels of negative- and zero-sequence overvoltage elements for
each of the three analog voltage quantities measured.
–100
–150
0
Internal
Fault Detection
(No Differential
Element Operation)
Overcurrent Elements
Choose from ten overcurrent curves for each current input.
Each torque-controlled, time-overcurrent element has two reset
characteristics. There is also one level of instantaneous and
definite-time elements available for each current input.
Time
Differential element remains secure for external faults with CT saturation.
3
Breaker Failure Detection
Open-Phase Detection
The SEL-487B includes complete breaker failure protection, including
retrip, for each terminal. Internal breaker failure is determined by
predefined protection schemes that allow different types of trip
signals and current flow conditions. External breaker failure device
inputs can be substituted for the internal breaker failure schemes,
while providing individual or identical responses to each breaker
failure condition.
Open-Phase
Detection
High-speed, open-pole detection logic detects open-pole conditions
in less than 0.75 cycles to reduce breaker failure coordination times.
Dynamic Zone Configuration
The SEL-487B dynamically assigns the input currents to the correct
differential elements without the need for additional auxiliary relays.
Connect the digital inputs from the busbar disconnect and breaker
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 as shown
(Figure A).
Note that the SEL-487B automatically includes the Zone 4 currents in
Zone 3 when Disconnect Switch DS3 is closed (Figure B).
Figure A.
Figure B.
4
Advanced Open CT Detection Logic
The patented open CT detection logic improves the security of the current differential element.
It assures current differential bus zones will not misoperate due to terminals that cannot be
properly measured. This advanced logic, when implemented, will block differential element
misoperations that occur under open or shorted CT conditions. The CT detection logic monitors
the CT terminals in every bus zone to detect when a contributing CT has failed.
Independent Check Zone Supervises Up to Six Differential Bus Zones
In complex busbar layouts, the SEL-487B uses disconnect auxiliary
contact status to define current differential bus zones and supervises
these zones with the independent “check zone” feature to prevent
misoperation due to discrepancy.
Check Zone
Zone 1
Zone 2
52
Check Zone Key Features
• Provides secure supervision for bus zones
• Supervises bus zones independently of terminal auxiliary
disconnect status
• Processes its logic independently of all bus zones
• Fits a wide variety of applications and protection philosophies
with independent pickup and slope settings
52
52
52
52
SEL-487B
SEL-487B
SEL-487B
BERLIN
LONDON
NEW YORK
Zone 2
Zone 1
CANBERRA
Check Zone
This is a basic example of a check zone supervising only two three-phase
zones, with one SEL-487B per phase. These three SEL-487B Relays can
supervise up to six three-phase zones.
Three-Relay Bus Protection Application—For Up
to 18 Terminals
A single-phase check zone is provided per relay. A three-phase
(A,B,C) check zone will require three relays.
Configure a check zone for every phase, encompassing all terminals
at the station (except bus coupler and sectionalizing breakers),
independent of disconnect auxiliary contact status.
acSELerator
®
Software
acSELerator
QuickSet® SEL-5030
Develop SEL-487B settings and busbar configurations offline with acSELerator QuickSet. The system automatically checks interrelated settings and
highlights out-of-range settings. Settings created offline can be transferred to the SEL-487B by using a PC communications link.
Graphical Logic Editor (GLE)
Simplify the process of configuring your SEL-487B using the GLE in acSELerator
QuickSet SEL-5030 Software. The GLE allows you to view your SELogic equations
graphically, so your settings files can be documented for easier validation and
commissioning. Convert existing SELogic control equations to easy-to-read
diagrams, and save diagrams with your QuickSet settings.
acSELerator
5
®
graphical logic editor (GLE).
Automation and Control
The SEL-487B control logic can replace the following:
• Traditional panel control switches
• RTU-to-relay wiring
• Traditional latching relays
• Traditional indicating panel lights
• Panel meters
Eliminate traditional panel control switches with 32 local control
points. Set, clear, or pulse local control points with the programmable
front-panel pushbuttons and display. Program the local control points
to implement your control scheme via SELogic control equations.
Eliminate RTU-to-relay wiring with 32 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. Apply remote control points for SCADA-type control
operations, such as trip and group selection.
Advanced Display and Controls for Next-Generation Substation Automation
and Integration
Rotating display automatically scrolls
between custom metering displays, alarms,
event summaries, and preconfigured
fundamental line quantity displays.
SEL provides a worldwide,
ten-year product warranty
and —40° to +85°C operating
temperature range—the
best in the industry.
Easy-to-use keypad aids
simple navigation and
set-point adjustment.
Detailed, programmable target LEDs with
user-configurable labels give fast and simple
information to assist dispatchers and line crews
in rapidly restoring power. Optionally, add eight
tricolored target LEDs.
Breaker status indication.
Enhanced Front-Panel HMI
Improve efficiency and simplify
installation with more target LEDs and
operator buttons. The 7U and 9U chassis
have options for an additional eight
target LEDs and four operator control
buttons.
• Indicate relay state and various
Service control switch.
trip conditions with 24 target LEDs,
or configure the LEDs for specific
applications.
• Meet operator control needs by
modifying the 12 operator buttons to
replace traditional panel switches,
and control more circuit breakers.
6
The front-panel LCD shows
the latest 200 of the 1,000
events time-stamped in
the Sequential Events
Recorder (SER).
Programmable operator pushbuttons
and configurable labels provide
local switches to replace traditional
panel switches. Optionally, add four
tricolored operator pushbuttons to
control even more circuit breakers.
Monitoring and Metering
Access Useful Information
• Metering quantities include primary and secondary voltage
and current magnitudes, and angles for each terminal.
• Zone information displays primary or secondary current and
voltage for each terminal. The polarity of each CT and the bus
zones in each of the protective zones at the station are also
included.
• Differential metering shows the operating and restraint currents
for each zone as well as the reference current.
• Battery monitoring provides warning and alarm thresholds that
can be monitored with the SEL-2032/2030/2020 Communications
Processor. Trigger messages via local display, telephone, pager,
or other devices.
Simplify System Testing and Post-Fault Analysis
The SEL-487B event reporting capabilities help improve
understanding of even the most complex protective scheme
operations.
Illustrated here is security during an external fault with CT saturation. The
SEL-487B stores up to 480 cycles (8 seconds), in either 15-, 30-, 60-, or 120cycle event reports, at 24 samples per cycle in nonvolatile memory. Relay
settings are appended to the end of each report.
SER
Gain a broad perspective of relay element operation with the SER
in the SEL-487B. Items that trigger an SER entry are selectable
and can include as many as 250 monitoring points, such as input/
output, change of state, element pickup/dropout, and more. The
relay SER stores the latest 1,000 events, which are available
through the SER command. The latest 200 events are also
viewable via the front-panel LCD.
Illustrated here is security during MOV arrester conduction. User-selected
internal or external triggers can be used to generate oscillographic event
reports that include voltage, current, and element status information.
acSELerator
Analytic Assistant® SEL-5601 Software helps you compare
event reports from multiple relays, enhancing this powerful tool’s
analytic capabilities.
7
SEL-487B Bus Differential and Breaker Failure Relay
General Specifications
AC Current Inputs (secondary circuits)
5 A nominal
15 A continuous, linear to 100 A symmetrical, 500 A for 1 second,
1250 A for 1 cycle
Burden
0.27 VA @ 5 A; 2.51 VA @ 15 A
1 A nominal
3 A continuous, linear to 20 A symmetrical, 100 A for 1 second,
250 A for 1 cycle
Burden
0.13 VA @ 1 A; 1.31 VA @ 3 A
AC Voltage Inputs
300 VL-N continuous (connect any voltage up to 300 Vac)
600 Vac for 10 seconds
Burden
0.03 VA @ 67 V; 0.06 VA @ 120 V; 0.8 VA @ 300 V
Power Supply
125/250 Vdc or 120/240 Vac
Range
85—300 Vdc <35 W or 85—264 Vac (30—120 Hz)
Burden
<120 VA
48/125 Vdc or 120 Vac
Range
38—140 Vdc <35 W or 85—140 Vac (30—120 Hz)
Burden
<120 VA
24/48 Vdc
Range
18—60 Vdc
Burden
<35 W
Station DC Battery System Monitor Specifications
Operating Range
0—350 Vdc
Input Sampling Rate
24 samples per cycle
Processing Rate
1/6 cycle
Maximum Operating Time ±1.5 cycles (all elements but DC1R)
±1.5 seconds (element DC1R)
Setting Range
DC Settings
OFF, 15—300 Vdc, 1 Vdc steps
AC Ripple Setting
1—300 Vac, 1 Vac steps
Accuracy
Pickup Accuracy
±3%, plus ±2 Vdc (all elements but DC1RP)
±10%, plus ±2 Vdc (DC1RP)
Serial Communications Ports
Three rear-panel and one front-panel EIA-232 ports.
SEL ASCII Commands, SEL Fast Messages, DNP3
Serial Data Speed
300—57600 bps
Ethernet Communications Options
Provides IEC 61850, DNP3 LAN/WAN, FTP, Telnet protocols,
and web server capabilities.
Ethernet connection media options:
10/100BASE-T Twisted-Pair Network
10/100BASE-FX Fiber-Optic Network1
Metering Accuracy
All metering accuracies are based on an ambient temperature
of 20°C and nominal frequency.
Instantaneous Differential Metering Per Zone
±5.0%, ±0.02 • INOM
IOP, IRT
Per-Phase Instantaneous Metering and V01, V02, and V03
I01, I02, . . ., I18
±3% ±0.004 • INOM , ±2.0°
Conformal Coating Option
Protect equipment from harsh environments and airborne
contaminants, such as hydrogen sulfide, chlorine, salt, and
moisture.
Chassis Options
9U chassis supports up to 4 optional I/O boards
7U chassis supports up to 2 optional I/O boards
Relay provides many I/O port options (9U version shown).
1
Eye-safe, Class 1 LED device per EN 60825-1
Pullman, Washington USA
Tel: +1.509.332.1890 • Fax: +1.509.332.7990 • www.selinc.com • [email protected]
© 2005—2010 by Schweitzer Engineering Laboratories, Inc. PF00063 • 20101111