Date Code 20170927 Instruction Manual SEL-751 Relay
Preface
Manual Overview
The SEL-751 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-751; lists the relay specifications.
Section 2: Installation. Describes how to mount and wire the SEL-751;
illustrates wiring connections for various applications.
Section 3: PC Software. Describes the features, installation methods, and
types of help available with the
ACSELERATOR 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.
Section 6: Settings. Describes how to view, enter, and record settings for
protection, control, communications, logic and monitoring.
Section 7: Communications. Describes how to connect the SEL-751 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 in detail the two-line display
(2 x 16 characters) and the touchscreen display (5-inch, color,
800x480pixels).
Section 9: Bay Control. Describes how to configure and design the bay
control screens for SEL-751 relays with the touchscreen display (5-
inch, color, 800 x 480 pixels).
Section 10: Analyzing Events. Describes event type, messages, event
summary data, standard event reports, and Sequential Events Recorder
(SER) report.
Section 11: Testing and Troubleshooting. Describes protection element test
procedures, relay self-test, and relay troubleshooting.
Appendix A: Firmware, ICD, and Manual Versions. Lists the present relay
firmware version and details differences between the present and
previous versions. Provides a record of changes made to the manual
since the initial release.
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