Synchrocheck - GE L30 Instruction Manual

6.3 METERING
The metered values for real, reactive, and apparent power, as well as power factor, are displayed in this menu. The "SRC
1" text is replaced by whatever name was programmed by the user for the associated source (see

SETUP SIGNAL SOURCES
When VTs are configured in wye, the L30 calculates power in each phase and three-phase power is measured as
When VTs are configured in delta, the L30 does not calculate power in each phase and three-phase power is measured as
where
S is the apparent power
V , V , V , I , I , I are phase voltage and phase current phasors
A B C A B C
V and V are phase-to-phase voltage phasors
AB CB
Î is the conjugate of I
g) FREQUENCY METERING
PATH: ACTUAL VALUES
 FREQUENCY
 SRC 1
6
The metered frequency values are displayed in this menu. The "SRC 1" text will be replaced by whatever name was pro-
grammed by the user for the associated source (see
is measured via software-implemented zero-crossing detection of an AC signal. The signal is either a
SOURCE FREQUENCY
Clarke transformation of three-phase voltages or currents, auxiliary voltage, or ground current as per source configuration
(see the
SYSTEM SETUP
final frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
If the 87L function is enabled, then dedicated 87L frequency tracking is engaged. In this case, the relay uses the

TRACKING FREQUENCY
PATH: ACTUAL VALUES
 SYNCHROCHECK 1

If a synchrocheck function setting is "Disabled", the corresponding actual values menu item is not displayed.
6-18
SRC 1 POWER FACTOR
MESSAGE
φa:
SRC 1 POWER FACTOR
MESSAGE
φb:
SRC 1 POWER FACTOR
MESSAGE
φc:
).
S = V x Î
A
S = V
 
METERING SOURCE SRC 1
SRC 1 FREQUENCY:
0.00 Hz
 settings). The signal used for frequency estimation is low-pass filtered. The
POWER SYSTEM

TRACKING FREQUENCY
 
METERING

SYNCHROCHECK

SYNCHROCHECK 1 DELTA
VOLT: 0.000 V
SYNCHROCHECK 1 DELTA
MESSAGE
PHASE:
SYNCHROCHECK 1 DELTA
MESSAGE
FREQ:
L30 Line Current Differential System
1.000
1.000
1.000
+ V x Î + V x Î
A B B C C
x Î + V x Î
AB A CB C

FREQUENCY

SETTINGS SYSTEM SETUP
value for all computations, overriding the

SYNCHROCHECK 1(4)
0.0°
0.00 Hz
6 ACTUAL VALUES

SETTINGS
 ).
SIGNAL SOURCES
SOURCE FREQUENCY
6.3.4 SYNCHROCHECK
SYSTEM
(EQ 6.1)
(EQ 6.2)
METERING
value.
GE Multilin