GE G30 - Page 434

6-20 G30 Generator Protection System GE Multilin
6.3 METERING 6 ACTUAL VALUES
6
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
SETTINGS  SYSTEM
SETUP  SIGNAL SOURCES).
When VTs are configured in wye, the G30 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 G30 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
g) ENERGY METERING
PATH: ACTUAL VALUES  METERING  SOURCE SRC 1  ENERGY
The metered values for real and reactive energy are displayed in this menu. The "SRC 1" text will be replaced by whatever
name was programmed by the user for the associated source (see
SETTINGS  SYSTEM SETUP  SIGNAL SOURCES).
Because energy values are accumulated, these values should be recorded and then reset immediately prior to changing
CT or VT characteristics.
h) FREQUENCY METERING
PATH: ACTUAL VALUES  METERING  SOURCE SRC 1  FREQUENCY
MESSAGE
SRC 1 APPARENT PWR
φb: 0.000 VA
MESSAGE
SRC 1 APPARENT PWR
φc: 0.000 VA
MESSAGE
SRC 1 POWER FACTOR
3φ: 1.000
MESSAGE
SRC 1 POWER FACTOR
φa: 1.000
MESSAGE
SRC 1 POWER FACTOR
φb: 1.000
MESSAGE
SRC 1 POWER FACTOR
φc: 1.000
 ENERGY
 SRC 1
SRC 1 POS WATTHOUR:
0.000 Wh
MESSAGE
SRC 1 NEG WATTHOUR:
0.000 Wh
MESSAGE
SRC 1 POS VARHOUR:
0.000 varh
MESSAGE
SRC 1 NEG VARHOUR:
0.000 varh
 FREQUENCY
 SRC 1
SRC 1 FREQUENCY:
0.00 Hz