Date Code 20150130 Instruction Manual SEL-787 Relay
Section 2
Installation
Instruction 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 is controlled.
You can place the relay in extreme temperature and humidity locations. (See
Operating Temperature and Operating Environment on page 1.11.) For
EN 61010 certification, the SEL-787 rating is 2000 m (6560 feet) above mean
sea level.
To comply with the requirements of the European ATEX standard for
hazardous locations, the SEL-787 must be installed in an enclosure that meets
the requirements of an Ex n enclosure rated IP54 or better. The enclosure
should be certified to these requirements or be tested for compliance as part of
the complete assembly. In North America, the relay is approved for Class 1,
Division 2, Groups A, B, C, D, and T4 hazardous locations.
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