Date Code 20151029 Protection Manual SEL-411L Relay
Section 2
P.Protection Manual
Installation
The first steps in applying the relay are installing and connecting the relay.
This section describes common installation features and particular installation
requirements for the many physical configurations of the relay. You can order
the relay in horizontal and vertical orientations, and in panel-mount and
rack-mount versions. SEL also provides various expansion I/O (input/output)
interface boards to tailor the relay to your specific needs.
To install and connect the relay safely and effectively, you must be familiar
with relay configuration features and options and relay jumper configuration.
You should carefully plan relay placement, cable connection, and relay
communication. Consider the following when installing the relay:
➤ Shared Configuration Attributes on page P.2.1
➤ Plug-In Boards on page P.2.11
➤ Jumpers on page P.2.14
➤ Relay Placement on page P.2.24
➤ Connection on page P.2.25
➤ AC/DC Connection Diagrams on page P.2.44
It is also very important to limit access to the relay settings and control
functions by using passwords. For information on relay access levels and
passwords, see Changing the Default Passwords: Terminal on page P.10.9.
Shared Configuration Attributes
There are common or shared attributes among the many possible
configurations of relays. This section discusses the main shared features of the
relay.
Relay Sizes
SEL produces the relay in horizontal and vertical rack-mount versions and
horizontal and vertical panel-mount versions. Relay sizes correspond to height
in rack units, U, where U is approximately 1.75 inches or 44.45 mm. The relay
is available in 4U, 5U, and 6U sizes.
Front-Panel
Templates
The horizontal front-panel template shown in Figure 2.1 is the same for all
4U, 5U, and 6U horizontal versions of the relay. The vertical front-panel
template (shown in Figure 2.1) is the same for all 4U, 5U, and 6U vertical
versions of the relay.
The relay front panel has three pockets for slide-in labels: one pocket for the
target LED label, and two pockets for the operator control labels. Figure 2.1
shows the front-panel pocket areas and openings for typical horizontal and
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