Sel 551 - Preface; Manual Overview

Date Code 20110408 Instruction Manual SEL-551 Relay
Preface
Manual Overview
The SEL-551 Relay Instruction Manual describes common aspects of relay
application and use. It includes the necessary information to install, set, test,
and operate the relay and more detailed information about settings and
commands.
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-551; lists the relay specifications.
Section 2: Installation. Describes how to mount and wire the SEL-551;
illustrates wiring connections for various applications.
Section 3: Relay Elements and Logic. Describes operating characteristics
of elements through the use of logic diagrams and text and explains
how to calculate their settings; describes contact output logic.
Section 4: Setting the Relay. Describes how to enter and record settings.
Section 5: Serial Port Communications and Commands. Describes how to
connect the SEL-551 to a PC for communication; shows serial port
pinouts; lists and defines serial port commands.
Section 6: Front-Panel Interface. Explains the features and use of the front
panel, including front-panel command menu, default displays, and
automatic messages.
Section 7: Standard Event Reports and SER. Describes event summary
data, standard event reports, and Sequential Events Recorder (SER)
report.
Section 8: Testing and Troubleshooting. Describes protection element test
procedures, relay self-test, and relay troubleshooting.
Section 9: Appendices. Contains the following appendices:
Appendix A: Firmware and Manual Versions
Appendix B: Firmware Upgrade Instructions
Appendix C: SEL Distributed Port Switch Protocol
Appendix D: Configuration, Fast Meter, and Fast Operate Commands
Appendix E: Compressed ASCII Commands
Appendix F: Setting Negative-Sequence Overcurrent Elements
Appendix G: Modbus RTU Communications Protocol
SEL-551 Command Summary. Briefly describes the serial port commands
that are fully described in Section 5: Serial Port Communications
and Commands.