CHAPTER 6: ACTUAL VALUES METERING
D30 LINE DISTANCE 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 D30 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 D30 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 Frequency metering
ACTUAL VALUES METERING SOURCE SRC 1 FREQUENCY
The metered frequency values are displayed in this menu. The "SRC 1" text is replaced by the name programmed by the
user for the associated source (see
SETTINGS SYSTEM SETUP SIGNAL SOURCES).
SOURCE FREQUENCY is measured via software-implemented zero-crossing detection of an AC signal. The signal is either a
Clarke transformation of three-phase voltages or currents, auxiliary voltage, or ground current as per source configuration
(see the
SYSTEM SETUP POWER SYSTEM settings). The signal used for frequency estimation is low-pass filtered. The final
frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
6.4.3 Synchrocheck
ACTUAL VALUES METERING SYNCHROCHECK SYNCHROCHECK 1(4)
FREQUENCY
SRC 1
SRC 1 FREQUENCY:
0.00 Hz
SYNCHROCHECK 1
SYNCHROCHECK 1 DELTA
VOLT: 0.000 kV
SYNCHROCHECK 1 DELTA
FREQ: 0.00 Hz
SYNCHROCHECK 1
DELTA PHASE: 0.0°
SYNCHROCHECK 1
SYNSCP D_PH: 0.0°
SYNCHROCHECK 1
V1 MAG: 0.000 kv
SYNCHROCHECK 1
V1 ANG: 0.0°
SYNCHROCHECK 1
V2 MAG: 0.000 kV
SYNCHROCHECK 1
V2 ANG: 0.0°
SYNCHROCHECK 1 PROJ
V2 MAG: 0.000 kV
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