Date Code 20090715 SEL-421 Relay
Preface
This manual provides information and instructions for installing and operating
the SEL-421 Relay. The three volumes that comprise this manual are for use
by power engineers and others experienced in protective relaying applications.
Included are detailed technical descriptions of the relay and application
examples. While this manual gives reasonable examples and illustrations of
relay uses, you must exercise sound judgment at all times when applying the
SEL-421 in a power system.
SEL-421 Versions and Supported Features on page U.1.7 shows the relay
features supported by versions SEL-421-0, SEL-421-1, SEL-421-2, and
SEL-421-3. Throughout the manual, we provide margin notes next to the text
explaining a feature to specify the availability of that feature in different
versions of the relay.
Manual Overview
The SEL-421 Relay Manual consists of three volumes:
➤ User’s Guide
➤ Applications Handbook
➤ Reference Manual
In addition, the SEL-421 Relay Manual contains a comprehensive Index that
encompasses the entire manual. The index appears at the end of each printed
volume. In the electronic version of the manual, the index appears once;
hyperlinks take you to material referenced in the index. Also included is a
glossary that lists and defines technical terms used throughout the manual.
The SEL-421 Relay Manual is a comprehensive work covering all aspects of
relay application and use. Read the sections that pertain to your application to
gain valuable information about using the SEL-421. For example, to learn
about relay protection functions, read the protection sections of this manual
and skim the automation sections, then concentrate on the operation sections
or on the automation sections of this manual as your job needs and
responsibilities dictate. An overview of each manual section and section
topics follows.
User’s Guide
Preface. Describes manual organization and conventions used to present
information (appears once in the electronic form of the manual;
repeated in each printed volume).
Section 1: Introduction and Specifications. Introduces SEL-421 features;
summarizes relay functions and applications; lists relay specifications,
type tests, and ratings.
Section 2: Installation. Discusses the ordering configurations and interface
features (control inputs, control outputs, and analog inputs, for
example); provides information about how to design a new physical
installation and secure the relay in a panel or rack; details how to set
relay board jumpers and make proper rear-panel connections
(including wiring to CTs, PTs, and a GPS receiver); explains basic
connections for the relay communications ports.
Courtesy of NationalSwitchgear.com
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