K.5
Date Code 20100129
Instruction Manual
SEL-751A Relay
Analog Quantities
RMS Metering
IARMS
A-phase rms current
A primary
x
x
x
x
IBRMS
B-phase rms current
A primary
x
x
x
x
ICRMS
C-phase rms current
A primary
x
x
x
x
INRMS
Neutral rms current
A primary
x
x
x
x
VARMS
A-phase rms voltage
V primary
x
x
x
x
VBRMS
B-phase rms voltage
V primary
x
x
x
x
VCRMS
C-phase rms voltage
V primary
x
x
x
x
VSRMS
Vsync rms voltage
V primary
x
x
x
x
VABRMS
A-to-B phase rms voltage
V primary
x
x
x
x
VBCRMS
B-to-C phase rms voltage
V primary
x
x
x
x
VCARMS
C-to-A phase rms voltage
V primary
x
x
x
x
Demand Metering
IAD
Phase A Current Demand
A pri
x
x
x
x
IBD
Phase B Current Demand
A pri
x
x
x
x
ICD
Phase C Current Demand
A pri
x
x
x
x
IGD
Residual Current Demand
A pri
x
x
x
x
3I2D
Negative-Sequence Current Demand
A pri
x
x
x
x
Peak Demand Metering
PM_LRDH
Peak Demand Last Reset Date/Time High Word
x
PM_LRDM
Peak Demand Last Reset Date/Time Middle Word
x
PM_LRDL
Peak Demand Last Reset Date/Time Low Word
x
IAPD
Phase A Current Peak Demand
A pri
x
x
x
x
IBPD
Phase B Current Peak Demand
A pri
x
x
x
x
ICPD
Phase C Current Peak Demand
A pri
x
x
x
x
IGPD
Residual Current Peak Demand
A pri
x
x
x
x
3I2PD
Negative-Sequence Current Peak Demand
A pri
x
x
x
x
Breaker Monitoring
INTT
Internal trips— counter
x
x
x
x
INTIA
Accumulated current—internal trips, A-phase
kA primary
x
x
x
x
INTIB
Accumulated current—internal trips, B phase
kA primary
x
x
x
x
INTIC
Accumulated current—internal trips, C phase
kA primary
x
x
x
x
EXTT
External trips—counter
x
x
x
x
EXTIA
Accumulated current—external trips, A phase
kA primary
x
x
x
x
EXTIB
Accumulated current—external trips, B phase
kA primary
x
x
x
x
EXTIC
Accumulated current—external trips, C phase
kA primary
x
x
x
x
WEARA
Breaker Wear, A-phase
%
x
x
x
x
WEARB
Breaker Wear, B-phase
%
x
x
x
x
WEARC
Breaker Wear, C-phase
%
x
x
x
x
Table K.1
Analog Quantities
(Sheet 5 of 6)
Label
Description
Units
Disp
la
y
Po
in
ts
SEL
OGIC
Load
Pr
of
ile
DN
P
Fa
s
t
Me
te
r
Содержание 751A
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