Schweitzer Engineering Laboratories SEL-487V User Manual

Schweitzer Engineering Laboratories, Inc. SEL-487V Data Sheet
Capacitor Bank Protection,
Automation, and Control
Major Features and Benefits
The SEL-487V Capacitor Bank Protection, Automation,
and Control System integrates voltage or reactive power
control for grounded and ungrounded capacitor banks
with full automation and protection in one device.
➤ Protects Grounded and Ungrounded Banks.
The SEL-487V provides sensitive voltage differen-
tial or current unbalance protection with compen-
sation adjustment. The compensation adjustment is
used to zero out small unbalances that are natural
in the bank as well as instrument transformer
errors. Instantaneous and time-overcurrent ele-
ments and voltage elements provide additional pro-
tection for the capacitor bank. The SEL-487V
provides breaker failure protection for the capaci-
tor bank breaker using high-speed (less than one
cycle) open-pole detection logic that reduces coor-
dination times for critical breaker failure applica-
tions.
➤ Control. The SEL-487V-1 is available with control
functions for maintaining system voltage, VAR or
power factor (PF) levels, and reactor loading. The
control functions include auto/manual and
local/remote control capabilities with control insta-
bility detection for alarm or blocking of control
operations. Implement the time-of-day control fea-
ture to synchronize capacitor bank insertion with
peak VAR demand periods for any weekday or
weekend period. Automatically sequence as many
as three capacitor bank stages by using the univer-
sal sequencing control. This control provides
sequencing based upon accumulated operating
time, an analog quantity, or a fixed order.
➤ Automation. Take advantage of enhanced automa-
tion features that include 32 programmable ele-
ments for local control, remote control, protection
latching, and automation latching. Local metering
and control on the large format front-panel liquid
crystal display eliminates the need for separate
panel meters and switches. Serial and Ethernet
links efficiently transmit key information, includ-
ing:
➢ Metering data
➢ Protection element and control I/O status
➢ IEEE C37.118 synchrophasors
SEL-487V Relay

Schweitzer Engineering Laboratories SEL-487V Specifications

General

Frequency Range	50/60 Hz
Current Rating	5 A
Digital Inputs	8
Communication Ports	Ethernet, Serial
Category	Relay
Mounting	Panel
Voltage Inputs	3
Current Inputs	3
Protocols	Modbus RTU, DNP3
Protection Functions	Differential, Overcurrent
Operating Temperature	-40 to +85 °C

Summary

Major Features and Benefits

Capacitor Bank Protection

Protects grounded/ungrounded capacitor banks via differential/current unbalance with compensation.

System Control and Automation

Integrates voltage/reactive power control with automation, featuring time-of-day and sequencing.

Application Settings and Identification

Features simple settings, fault identification logic, and settings assistance software.

Communication and Time Synchronization

Includes Ethernet access, SNTP time sync, IEC 60255 thermal model, and digital communications.

Metering and Event Recording

Provides comprehensive metering, SER, oscillography, harmonic metering, and thermal overload protection.

Synchrophasors and Auxiliary Controls

Covers synchrophasor data streams, auxiliary trip/close pushbuttons, and directional elements.

Functional Overview and Protection Types

Protection Element Overview

Illustrates and lists key protection elements via a functional diagram and tables.

Differential Voltage Protection

Details phase-voltage and neutral-voltage differential protection elements for capacitor banks.

Current Unbalance Protection

Explains phase and neutral current unbalance detection for capacitor bank protection.

Overcurrent and Undercurrent Protection

Covers instantaneous/inverse-time overcurrents and undercurrent elements for load loss detection.

Voltage, Frequency, and Breaker Logic

Details voltage/frequency elements, breaker failure, flashover, thermal overload, and LOP supervision.

Control, Interface, and Integration

Local Control and Front Panel Operation

Enables direct control via one-line diagrams, breaker operations, settings interfaces, and front panel display.

Status, Alarms, and Auxiliary Controls

Details target LEDs, advanced display points, alarm management, and auxiliary pushbuttons.

Monitoring, Metering, and Sequencer

Covers alarm points, universal sequencer for bank staging, and metering capabilities.

SELOGIC Control Equations

Describes using SELOGIC for advanced logic, functions, and custom control equations.

Network Connectivity and Protocols

Explains Ethernet, Telnet/FTP, IEEE C37.118, DNP3, IEC 61850, and network integration.

Specifications and Physical Details

Panel Diagrams

Shows typical horizontal and vertical front-panel layouts for rack and panel mounts.

Relay Dimensions

Provides physical dimensions for chassis, including panel cutouts and mounting details.

Technical Specifications

Details AC inputs, power supply, frequency, control outputs, thresholds, and environmental/EMC compliance.