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Sel SEL-487B User Manual

Sel SEL-487B
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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
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Sel SEL-487B Specifications

General IconGeneral
BrandSel
ModelSEL-487B
CategoryRelays
LanguageEnglish

Summary

Major Features and Benefits

Functional Overview

Protection Features

Dynamic Zone Configuration

Dynamically assigns input currents to differential elements without auxiliary relays.

Zone Selection Logic

Assigns correct current values to differential elements based on user-defined conditions.

End-Zone Protection

Achieves end-zone protection using SELOGIC control equations for user-defined conditions.

Check Zones

Provides three independent check zones to monitor incoming sources and outgoing feeders.

Differential Protection

Includes six independent current differential elements with fast operating times for internal faults.

CT Supervision

Monitors differential zone restraint and operating current for open/shorted CT conditions.

Voltage Elements

Consists of phase undervoltage/overvoltage and negative/zero-sequence overvoltage elements.

Breaker Failure Protection

Includes complete breaker failure protection with retrip for each of the 21 terminals.

Overcurrent Elements

Offers 10 time-overcurrent curves and instantaneous/definite-time overcurrent elements.

Disconnect Status Monitor

Monitors disconnect open/close contact relationship and interprets auxiliary contact combinations.

Tie-Breaker Configurations

Details three tie-breaker schemes using CTs configured in overlap or across the breaker.

Six Independent Settings Groups Increase Operation Flexibility

Relay stores six settings groups to cover various protection and control contingencies.

Applications

Shows example configurations for double bus, breaker-and-a-half, and multiple busbar systems.

Time Synchronization, Automation, and Communication

Time Synchronization

Synchronizes relays using IRIG-B or IEEE 1588 PTPv2 for accurate time-stamping.

SNTP Time Synchronization

Uses Simple Network Time Protocol for cost-effective synchronization via Ethernet.

Precision Time Protocol (PTP) Time Synchronization

Utilizes IEEE 1588 PTPv2 for high-accuracy timing over Ethernet networks.

Automation

Supports remote data acquisition and control functions using various communication protocols.

Time-Domain Link (TiDL) Technology

Enables remote analog and digital data acquisition over an IEC 61158 EtherCAT TiDL network.

Flexible Control Logic and Integration Features

SELOGIC Control Equations With Expanded Capabilities and Aliases

Enables advanced relay logic programming using equations, inputs, outputs, and custom aliases.

ACSELERATOR QuickSet SEL-5030 Software

Software for offline settings development, configuration, and analysis of relay settings.

MIRRORED BITS Communications

Provides bidirectional relay-to-relay digital communication for enhanced coordination and tripping.

Communications Features

Ethernet Card

Provides Ethernet communication capabilities for Telnet, FTP, IEC 61850, and DNP3 LAN/WAN.

Telnet and FTP

Enables remote access to relay settings, metering, and event reports via Ethernet.

DNP3 LAN/WAN

Offers DNP3 Level 2 slave functionality over Ethernet for SCADA communication.

Precision Time Protocol (PTP)

Supports IEEE 1588 PTPv2 for data time synchronization over Ethernet networks.

Advanced Communications and Software Tools

Parallel Redundancy Protocol (PRP)

Provides seamless recovery from Ethernet network failures according to IEC 62439-3.

HTTP Web Server

Serves read-only web pages for relay status, settings, and metering information.

IEC 61850 Ethernet Communications

Enables interoperability using logical nodes for substation monitoring and control.

MMS File Services

Supports file transfers within an MMS session for IEC 61850 data.

MMS Authentication

Requires authentication for MMS sessions to enhance security.

ACSELERATOR Architect

Software to manage logical node data for IEC 61850 devices on a network.

Additional Features

Front-Panel Display

Features LCD screen, LED indicators, and pushbuttons for local control and status monitoring.

Status and Trip Target LEDs

Describes standard and optional front-panel LEDs for indicating status and trip events.

Configurable Front-Panel Labels

Allows customization of target LED and pushbutton functions using labels and software.

Control Inputs and Outputs

Details the relay's input and output capabilities, including standard and high-current interrupting contacts.

Monitoring and Metering

Flexible Metering Capabilities

Provides primary/secondary current, voltage, PT/CT ratios, and zone information.

Event Reporting, Oscillography, and Event Summary

Aids post-fault analysis with event reports, oscillography, and concise event summaries.

Substation Battery Monitor

Monitors substation battery voltage, alarms, and dual ground detection for DC quality.

Front- and Rear-Panel Diagrams

Standard Front-Panel Diagram

Illustrates the standard front panel layout including LCD, pushbuttons, and target LEDs.

Expanded Front-Panel Diagram

Shows the optional expanded front panel with more LEDs and programmable pushbuttons.

Relay Dimensions

Rack- and Panel-Mount Chassis Dimensions

Provides detailed dimensions for rack-mount and panel-mount chassis configurations.

Specifications

Compliance and General Parameters

Covers compliance, inputs, outputs, power supply, and control specifications.

Communication and Time Functions

Details communication ports, time synchronization, and related specifications.

Environmental, Physical, and EMC

Lists physical dimensions, environmental ratings, and electromagnetic compatibility.

Reporting, Processing, and Element Specs

Covers data reporting, processing, element pickup ranges, and accuracies.

Metering and Specialty Functions

Details metering accuracy, voltage elements, and battery monitoring functions.

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