Date Code 20100129
Instruction Manual
SEL-751A Relay
Preface
Manual Overview
The SEL-751A Feeder Protection Relay Instruction Manual describes
common aspects of feeder relay application and use. It includes the necessary
information to install, set, test, and operate the relay.
An overview of each manual section and topics follows:
Preface.
Describes the manual organization and conventions used to
present information.
Section 1: Introduction and Specifications
Describes the basic features
and functions of the SEL-751A; lists the relay specifications.
Describes how to mount and wire the SEL-751A;
illustrates wiring connections for various applications.
Describes the features, installation methods, and
types of help available with the
AC
SEL
ERATOR
QuickSet
®
SEL-5030
Software.
Section 4: Protection and Logic Functions.
Describes the operating
characteristic of each protection element, using logic diagrams and
text, and explains how to calculate element settings; describes contact
output logic, automation, and report settings.
Section 5: Metering and Monitoring.
Describes the operation of each
metering function; describes the monitoring functions.
Describes how to enter and record settings for basic
protection, voltage-based protection, and RTD-based protection.
Describes how to connect the SEL-751A to a
PC for communication; shows serial port pinouts; lists and defines
serial port commands. Describes the communications port interfaces
and protocols supported by the relay for serial and Ethernet.
Section 8: Front-Panel Operations.
Explains the features and use of the
front panel, including front-panel command menu, default displays,
and automatic messages.
Describes front-panel LED operation, trip-
type front-panel messages, event summary data, standard event
reports, and Sequential Events Recorder (SER) report.
Section 10: Testing and Troubleshooting.
Describes protection element
test procedures, relay self-test, and relay troubleshooting.
Appendix A: Firmware and Manual Versions
.
Lists the current relay
firmware version and details differences between the current and
previous versions. Provides a record of changes made to the manual
since the initial release.
Appendix B: Firmware Upgrade Instructions
Describes the procedure to
update the firmware stored in flash memory.
Appendix C: SEL Communications Processors
.
Provides examples of how
to use the SEL-751A with the SEL-2032, SEL-2030, and SEL-2020
Communications Processors for total substation automation solutions.
Содержание 751A
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