GE G60

6-20 G60 Generator Protection System GE Multilin
6.3 METERING 6 ACTUAL VALUES
6
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
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
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.
i) CURRENT HARMONICS AND THD METERING
PATH: ACTUAL VALUES  METERING  SOURCE SRC 1  CURRENT HARMONICS
The metered current harmonics values 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). Current
harmonics are measured for each source for the total harmonic distortion (THD) and 2nd to 25th harmonics per phase.
 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
 CURRENT HARMONICS
 SRC 1
SRC 1 THD Ia: 0.0
Ib: 0.0 Ic: 0.0%
MESSAGE
SRC 1 2ND Ia: 0.0
Ib: 0.0 Ic: 0.0%
MESSAGE
SRC 1 3RD Ia: 0.0
Ib: 0.0 Ic: 0.0%
↓
MESSAGE
SRC 1 25TH Ia: 0.0
Ib: 0.0 Ic: 0.0%