CHAPTER 6: ACTUAL VALUES
METERING
F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6-19
6
This menu displays metered values for real, reactive, and apparent power, as well as power factor. The "SRC 1" text is
replaced by the name programmed by the user for the associated source (see
SETTINGS
SYSTEM SETUP
SIGNAL
SOURCES
).
When VTs are configured in wye, the F35 calculates power in each phase and three-phase power is measured as
S = V
A
x Î
A
+ V
B
x Î
B
+ V
C
x Î
C
Eq. 6-1
When VTs are configured in delta, the F35 does not calculate power in each phase and three-phase power is measured as
S = V
AB
x Î
A
+ V
CB
x Î
C
Eq. 6-2
where
S is the apparent power
V
A
, V
B
, V
C
, I
A
, I
B
, I
C
are phase voltage and phase current phasors
V
AB
and V
CB
are phase-to-phase voltage phasors
Î is the conjugate of I
6.4.2.7 Energy metering
ACTUAL VALUES
METERING
SOURCE SRC 1
ENERGY
This menu displays metered values for real and reactive energy. The "SRC 1" text is replaced by the name programmed by
the user for the associated source (see
SETTINGS
SYSTEM SETUP
SIGNAL SOURCES
). Because energy values are
accumulated, record them and then reset them immediately prior to changing CT or VT characteristics.
6.4.2.8 Demand metering
ACTUAL VALUES
METERING
SOURCE SRC 1
DEMAND
SRC 1 POWER FACTOR
3
φ
: 1.000
SRC 1 POWER FACTOR
φ
a: 1.000
SRC 1 POWER FACTOR
φ
b: 1.000
SRC 1 POWER FACTOR
φ
c: 1.000
ENERGY
SRC 1
SRC 1 POS WATTHOUR:
0.000 Wh
SRC 1 NEG WATTHOUR:
0.000 Wh
SRC 1 POS VARHOUR:
0.000 varh
SRC 1 NEG VARHOUR:
0.000 varh
DEMAND
SRC 1
SRC 1 DMD IA:
0.000 A
SRC 1 DMD IA MAX:
0.000 A
SRC 1 DMD IA DATE:
2001/07/31 16:30:07
SRC 1 DMD IB:
0.000 A
