
Date Code 20081022
Instruction Manual
SEL-787 Relay
Section 2
Installation
Instructi on Manual
Overview
The first steps in applying the SEL-787 Transformer Protection Relay are
installing and connecting the relay. This section describes common
installation features and requirements.
To install and connect the relay safely and effectively, you must be familiar
with relay configuration features and options. You should carefully plan relay
placement, cable connections, and relay communication.
This section contains drawings of typical ac and dc connections to the
SEL-787. Use these drawings as a starting point for planning your particular
relay application.
The instructions for using the versatile front-panel custom label option are
available on the SEL-787 product page on the SEL website. This allows you to
use SEL
OGIC®
control equations and slide-in configurable front-panel labels
to change the function and identification of target LEDs.
Relay Placement
Proper placement of the SEL-787 helps to ensure years of trouble-free
protection. Use the following guidelines for proper physical installation of the
SEL-787.
Physical Location
You can mount the SEL-787 in a sheltered indoor environment (a building or
an enclosed cabinet) that does not exceed the temperature and humidity
ratings for the relay. The relay is IEC EN61010-1 rated at Installation/
Overvoltage Category II and Pollution Degree 2. This rating allows mounting
of the relay indoors or in an outdoor (extended) enclosure where the relay is
protected against exposure to direct sunlight, precipitation, and full wind
pressure, but neither temperature nor humidity are controlled.
You can place the relay in extreme temperature and humidity locations. (See
and
Operating Environment on page 1.9
.) For
EN 61010 certification, the SEL-787 rating is 2000 m (6560 feet) above mean
sea level.
Relay Mounting
To flush mount the SEL-787 in a panel, cut a rectangular hole with the
dimensions shown in
. Use the supplied front-panel gasket for
protection against dust and water ingress into the panel (IP65).
Summary of Contents for SEL-787
Page 1: ...20081022 SEL 787 Transformer Protection Relay Instruction Manual PM787 01 NB ...
Page 6: ...This page intentionally left blank ...
Page 12: ...This page intentionally left blank ...
Page 18: ...This page intentionally left blank ...
Page 78: ...This page intentionally left blank ...
Page 206: ...This page intentionally left blank ...
Page 280: ...This page intentionally left blank ...
Page 334: ...This page intentionally left blank ...
Page 376: ...This page intentionally left blank ...
Page 388: ...This page intentionally left blank ...
Page 474: ...This page intentionally left blank ...
Page 508: ...This page intentionally left blank ...