Date Code 20170927 Instruction Manual SEL-751 Relay
Section 2
Installation
Overview
The first steps in applying the SEL-751 Feeder 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-751. 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-751 product page on the SEL website. With custom
labels, you can 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-751 helps to ensure years of trouble-free
protection. Use the following guidelines for proper physical installation of the
SEL-751.
Physical Location
You can mount the SEL-751 in a sheltered indoor environment (a building or
an enclosed cabinet) that does not exceed the temperature and humidity rat-
ings for the relay. The relay is IEC EN61010-1 rated at Installation/ Overvolt-
age Category II and Pollution Degree 2. This rating allows mounting of the
relay indoors or in an outdoor (extended) enclosure where the relay is pro-
tected against exposure to direct sunlight, precipitation, and full wind pres-
sure, but neither temperature nor humidity are controlled.
You can place the relay in extreme temperature and humidity locations. (See
Operating Temperature and Operating Environment on page 1.16.) For
EN 61010 certification, the SEL-751 rating is 2000 m (6560 ft) above mean
sea level. In North America, the relay is approved for Hazardous Locations
Class I, Division 2, Groups A, B, C, and D, and temperature class T4A in the
maximum surrounding air temperature of 50°C.
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