Date Code 20100129
Instruction Manual
SEL-751A Relay
Appendix K
Analog Quantities
The SEL-751A Feeder Protection Relay contains several analog quantities
that can be used for more than one function. The actual analog quantities
available depend on the part number of the relay used. Analog quantities are
typically generated and used by a primary function, such as, metering and
selected quantities are made available for one or more supplemental functions,
for example, the load profile.
Note that all analog quantities available for use in SEL
OGIC
are processed
every 100 ms and may not be suitable for fast-response control and protection
applications.
lists analog quantities that can be used in the following specific
functions:
➤
SEL
OGIC
control equations (see
➤
Display points (see
Section 8: Front-Panel Operations
.)
➤
Load profile recorder (see
.)
➤
DNP (see
Appendix D: DNP3 Communications
➤
Fast Meter (see
Appendix C: SEL Communications
.)
For a list of analog quantities available for Modbus communications, see
Appendix E: Modbus RTU Communications
Table K.1
Analog Quantities
(Sheet 1 of 6)
Label
Description
Units
Disp
la
y
Po
in
ts
SE
L
OGIC
Lo
a
d
Pr
o
fi
le
DN
P
Fa
s
t
Me
te
r
Fundamental Instantaneous Metering
IA_MAG
A-phase line current
A primary
x
x
x
x
x
IA_ANG
Angle of the A-phase line current
degrees
x
x
x
x
IB_MAG
B-phase line current
A primary
x
x
x
x
x
IB_ANG
Angle of the B-phase line current
degrees
x
x
x
x
IC_MAG
C-phase line current
A primary
x
x
x
x
x
IC_ANG
Angle of the C-phase line current
degrees
x
x
x
x
IN_MAG
Neutral current
A primary
x
x
x
x
x
IN_ANG
Angle of the neutral current
degrees
x
x
x
x
IG_MAG
Calculated-residual current
A primary
x
x
x
x
x
IG_ANG
Angle of the calculated-residual current
degrees
x
x
x
x
IAV
Average line current
A primary
x
x
x
x
3I2
Negative-sequence current
A primary
x
x
x
x
Содержание 751A
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