SEL-487BBUS DIFFERENTIAL AND BREAKER FAILURE RELAY

ANSI NUMBERS/ACRONYMS AND FUNCTIONS 50 Overcurrent51 Time-Overcurrent87 Current Differential16SEC Access Security (Serial, Ethernet)27/59 Over-/Undervoltage50BF Breaker Failure Overcurrent85 RIO SEL Mirrored Bits® CommunicationsDFR Event ReportsHMI Operator InterfaceLGC Expanded SELogic® Control EquationsMET High-Accuracy MeteringRTU Remote Terminal UnitSER Sequential Events Recorder

ADDITIONAL FUNCTIONSSBM Station Battery Monitor

1 Copper or Fiber-Optic

POWERFUL BUS PROTECTION WITH BREAKER PROTECTION BUILT-IN

4

EIA-232

2

Ethernet1

16SEC

2759

85RIO DFR HMI LGC

MET SBMRTU SER

1

IRIG-BSEL-487B RELAY

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

Protection

Protect bus systems with up to 21 terminals (21 CTs per relay, 63 CTs with a three-relay scheme), 6 protection zones, and 3 independent check zones. (For information about covering larger bus systems, contact your local SEL representative.) To optimize protection security, each check zone will supervise a designated phase in the system, and a patented open CT detection algo-rithm 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

Implement different ratio CTs and nondedicated CTs with the SEL-487B Bus Differential and Breaker Failure Relay. 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.

Automation and Control

Reduce project costs and simplify interconnect wiring by 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 substa-tion signals. Terminal currents, breaker and disconnect positions, station dc voltage levels, and three-phase voltage are continuously monitored and updated.

Enhanced Security

Indicate the relay configuration, who accesses it, and at what access level, with programmable alarm bits.

FEATURES AND BENEFITSTHE SEL-487B IS A POWERFUL SOLUTION FOR THE DIFFERENTIAL PROTECTION OF BUSBAR SYSTEMS WITH UP TO 21 TERMINALS.

The 487B Relay provides many I/O port options (9U version shown).

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DIFFERENTIAL PROTECTION

The SEL-487B includes six independent current differential elements, and each one 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

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 asserts an alarm that can be used to generate an external alarm and/or block the zone.

Voltage Element

Supervise current differential trip-ping within the relay by 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.

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.

PROTECTION

Differential element operation in less than one cycle for internal faults, including high-speed contact closure.

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.

FaultDetection Logic

Differential Element

TripOutput

InternalFault

External Fault

CT Supervision

Slope 1Slope 2

CurrentInput I01

CurrentInput I21

IOP

IRT

High-Security Operate Slope

Standard Operate Slope

Restraint Zone

FaultDetection Logic

Differential Element

TripOutput

InternalFault

External Fault

CT Supervision

Slope 1Slope 2

CurrentInput I01

CurrentInput I21

IOP

IRT

High-Security Operate Slope

Standard Operate Slope

Restraint Zone

Curr

ent (

ampe

res) 0

5

–5

0

0

5

10

15

20

Fault Inception

Internal Fault Detection (<1 cycle)

Time

IO1

IO2

Differential element remains secure for external faults with CT saturation.

–50

0

50

100

–150

0

–100

–50

0

50

Curr

ent (

ampe

res)

(No DifferentialElement Operation)

IO1

IO2

InternalFault Detection

Time

4

BREAKER FAILURE 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.

High-speed open-pole detection logic detects open-pole conditions in fewer than 0.75 cycles to reduce breaker failure coordination times.

Open-Phase Detection

Open-PhaseDetection

Traditional Overcurrent Dropout

Subsidence

Seconds

Am

pere

s

50

–50

–100

–150

0

0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2Time Offset: 0

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FLEXIBILITYDYNAMIC 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 (upper example).

Zone 1

Zone 2

North

HeliumBoron

Argon Lithium

KryptonSodium

Neon

DS1

East

Silicon

South

DS3Zone 4West

DS2

Zone 3

Zone 1

Zone 2

North

HeliumBoron

Argon Lithium

KryptonSodium

Neon

DS1

East

Silicon

South

DS3

West

DS2

Zone 3

Zone 1

Zone 2

North

HeliumBoron

Argon Lithium

KryptonSodium

Neon

DS1

East

Silicon

South

DS3Zone 4West

DS2

Zone 3

Zone 1

Zone 2

North

HeliumBoron

Argon Lithium

KryptonSodium

Neon

DS1

East

Silicon

South

DS3

West

DS2

Zone 3

Note that the SEL-487B automatically includes the Zone 4 currents in Zone 3 when Disconnect Switch DS3 is closed (lower example).

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 contrib-uting CT has failed.

acSELErator® SOFTWAREacSELErator 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. 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.

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52

52

52

TR 1 TR 2

52

FD 1

52

FD 2

Zone 1 Zone 2 Check Zone

52

FD 3

Check Zone

Zone 2Zone 1

3

33

33

3

3SEL-487B

This example shows a single SEL-487B Relay protecting a system with two 3-phase bus zones and increasing security by applying a check zone per phase.

SEL-487BSEL-451SEL-421

SEL-421 SEL-3530

SEL-3355

SEL-2725

Typical Ethernet network configuration.

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, an 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 the 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.

• Support seamless failover for Ethernet communications with Parallel Redundancy Protocol (PRP), which allows communications network redundancy using two separate but identical local-area networks (LANs).

THREE INDEPENDENT CHECK ZONES SUPERVISE 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 on a per-phase basis with the independent “check zone” feature to prevent misoperation due to discrepancy.

Check Zone Key Features

• Provides secure supervision for bus zones

• Supervises bus zones on a per-phase basis, independent 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

Three-Relay Bus Protection Application—For Up to 21 Terminals

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.

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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

AUTOMATION AND CONTROLADVANCED DISPLAY AND CONTROLS FOR NEXT-GENERATION SUBSTATION AUTOMATION AND INTEGRATION

control points for SCADA-type control operations, such as trip and group selection.

The SEL-487B control logic can replace:

• Traditional panel control switches

• RTU-to-relay wiring

• Traditional latching relays

• Traditional indicating panel lights

• Panel meters

8

Programmable pushbuttons with user-configurable labels replace traditional panel switches and control circuit breakers.

5

FRONT PANEL HMI

Improve efficiency and simplify installation with a built-in HMI, target LEDs, and operator pushbuttons.

Breaker status indication.

Service control switch.

1

1

2

2

3

Easy-to-use keypad provides simple navigation and set-point adjustment.

Programmable target LEDs with user-configurable labels indicate relay state and various trip condi-tions, and provide fast and simple information to assist dispatchers and line crews.

3

4

4

5

Front-Panel HMI Options

HMI Option Pushbuttons LEDs 7U-Compatible 9U-Compatible Standard 8 16 Yes Yes Enhanced 12* 24* Yes Yes

*Tricolor LEDsEnhanced front-panel HMI is shown above

Rotating LCD automatically scrolls between custom metering displays, alarms, event summaries, and preconfigured fundamental line quantity displays.

LCD shows the latest 200 of the 1,000 events time-stamped in the SER.

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MONITORING AND METERING

Illustrated here is security during an external fault with CT saturation. The SEL-487B stores high-resolution raw and filtered event data in nonvolatile memory at the maximum effective sampling rate of 8000 samples/second. Relay settings are appended at the end of each report.

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.

SIMPLIFY SYSTEM TESTING AND POST-FAULT ANALYSIS

The SEL-487B event-reporting capabilities help improve understanding of even the most complex protective scheme operations. Eliminate external recorder and metering require-ments with oscillographic and binary COMTRADE event reports and SER.

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.

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 Communications Processor and the SEL-3530 Real-Time Automation Controller (RTAC). Trigger messages via local display, telephone, pager, or other devices.

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GENERAL SPECIFICATIONSAC Voltage Inputs (3 total) 300 V continuous across the terminals (connect any voltage up to 300 Vac)

600 Vac for 10 seconds

Burden ≤0.5 VA @ 67 V

AC Current Inputs (21 total) 5 A nominal 15 A continuous, 500 A for 1 second, linear to 100 A symmetrical 500 A for 1 second, 1250 A for 1 cycle

Burden ≤0.5 VA @ 5 A

1 A nominal 3 A continuous, 100 A for 1 second, linear to 20 A symmetrical 100 A for 1 second, 250 A for 1 cycle

Burden ≤0.1 VA @ 1 A

Power Supply Ratings 125/250 Vdc or 120/240 Vac Range 85–300 Vdc or 85–264 Vac

48/125 Vdc or 120 Vac Range 38–140 Vdc or 85–140 Vac

24/48 Vdc Range 18–60 Vdc

Station DC Battery System Monitor Specifications

Operating range 0–350 Vdc

Input sampling rate 2 kHz

Processing rate 1/6 cycle

Maximum operating time ≤1.5 seconds (element DC1R) ≤1.5 cycles (all elements but DC1R)

Setting Range DC settings OFF, 15–300 Vdc, 1 Vdc steps

AC ripple setting 1–300 Vac, 1 Vac steps

Accuracy Pickup accuracy ±10%, ±2 Vdc (DC1RP) ±3%, ±2 Vdc (all elements but DC1RP)

Serial Communications Ports 3 rear-panel and 1 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, PRP, and Telnet protocols, and web server capabilities

Ethernet connection media options

10/100BASE-T twisted-pair network 10/100BASE-FX fiber-optic network

Metering Accuracy All metering accuracies are based on an ambient temperature of 20°C and nominal frequency.

Instantaneous differential metering per zone (steady state)

IOP, IRT ±5.0%, ±0.02 · INOM

Per-phase instantaneous metering (steady state)

V01, V02, and V03 ±0.1% (33.5–300) V ±2.5% (5–33.5) V

±0.5° (33.5–300) V ±1° (5–33.5) V

I01, I02, …, I21

5 A model 5 A nominal ±0.2% plus ±4 mA (0.5–100 A s)

1 A model 1 A nominal ±0.2% plus ±0.8 mA (0.1 -20 A s)

Event Reports/Oscillography Volatile memory 3 seconds of back-to-back event reports sampled at 8 kHz

Nonvolatile memory At least 5 event reports of a 3-second duration sampled at 8 kHz

Resolution 4 and 12 samples/cycle

Length 0.25–24 seconds (depending on LER setting)

Event Summary Storage 100 summaries

Sequential Events Recorder Sequential Events Recorder storage 1000 entries

Trigger elements 250 monitoring points

Protection processing rate 12 samples per cycle

Chassis Options 9U chassis supports up to 4 optional I/O boards

7U chassis supports up to 2 optional I/O boards

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SCHWEITZER ENGINEERING LABORATORIES, INC.

Tel: +1.509.332.1890 Email: info@selinc.com Web: www.selinc.com

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