1.14
SEL-751A Relay Instruction Manual Date Code 20100129
Introduction and Specifications
Models, Options, and Accessories
Accessories
Contact your Technical Service Center or the SEL factory for additional detail
and ordering information for the following accessories:
➤ External RTD protection
➢ SEL-2600 RTD Module
➢ A simplex 62.5/125 µm fiber-optic cable with ST
connector for connecting the external RTD module to
the SEL-751A
➤ SEL-C804 Multimode Fiber-Optic Arc-Flash Detection (AFD)
Sensors and Accessories
➤ SEL-751A Configurable Labels
Over-, underfrequency
elements (81)
xx x x
Power factor elements
(55)
x x x x
Loss of potential element
(60LOP)
xx x x
Real, reactive, apparent
power, and power factor
metering
x x x x
Energy metering x x x x
Synchronism-check ele-
ments including under-
and over-voltage ele-
ments (25, 27S, 59S)
x x
Station dc battery volt-
age monitor
xx
Demand and peak
demand metering
x x
Residual overvoltage ele-
ment (59G)
xx
Negative-sequence over-
voltage element (59Q)
x x
Rate-of-change of fre-
quency element (81R)
xx
Power elements (32) x x
4-channel optical arc-
flash sensor inputs with
continuous self-testing
(AFD)
x
Arc-flash protection ele-
ments (50PAF, 50NAF)
x
a
Voltage Options
b
With Monitoring Package
c
With Monitoring and Advanced Metering and Protection Packages
d
With 4-channel Arc-Flash Detector Inputs and Protection
Table 1.1 Voltage Input Options (Sheet 2 of 2)
Voltage Input Options
Option (71)
SEL
ECT
3AVI
a
Option (72)
SEL
ECT
5AVI
b
Option (73)
SEL
ECT
5AVI
c
Option (74)
SEL
ECT 3AVI/
4AFDI
d
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