6.3 METERING
The harmonics are a percentage of the fundamental signal obtained as a ratio of harmonic amplitude to fundamental ampli-
tude multiplied by 100%. The total harmonic distortion (THD) is the ratio of the total harmonic content to the fundamental:
Voltage harmonics are calculated only for Wye connected phase VTs. Ensure the
VOLTAGE BANK F5
NOTE
PATH: ACTUAL VALUES
SYNCHROCHECK 1
If a synchrocheck function setting is "Disabled", the corresponding actual values menu item is not displayed.
6
PATH: ACTUAL VALUES
TRACKING FREQUENCY
The tracking frequency is displayed here. The frequency is tracked based on the selection of the reference source with the
FREQUENCY AND PHASE REFERENCE
System section of chapter 5 for details.
PATH: ACTUAL VALUES
FREQUENCY RATE
OF CHANGE
The metered frequency rate of change for the frequency rate of change elements is shown here.
6-22
2
(
,
)
--- -
F
m h
=
real
N
k
2
(
m h ,
)
--- -
F
=
imag
N
k
(
m h ,
)
F
F
=
ampl
THD
=
PHASE VT XX CONNECTION
METERING
SYNCHROCHECK
SYNCHROCHECK 1 DELTA
VOLT:
0.000 V
SYNCHROCHECK 1 DELTA
MESSAGE
PHASE:
SYNCHROCHECK 1 DELTA
MESSAGE
FREQ:
METERING
TRACKING FREQUENCY
TRACKING FREQUENCY:
60.00 Hz
setting in the
SETTINGS
METERING
FREQUENCY RATE OF CHANGE
FREQUENCY RATE OF
CHANGE 1: 0.00 Hz/s
FREQUENCY RATE OF
MESSAGE
CHANGE 2: 0.00 Hz/s
FREQUENCY RATE OF
MESSAGE
CHANGE 3: 0.00 Hz/s
FREQUENCY RATE OF
MESSAGE
CHANGE 4: 0.00 Hz/s
G30 Generator Protection System
(
(
)
⋅
(
h ω
⋅
⋅
t k ( )
)
)
f m k
cos
–
0
(
(
)
⋅
(
h ω
⋅
⋅
t k ( )
)
)
f m k
sin
–
0
2
2
(
,
)
(
,
)
m h
F
m h
+
real
imag
2
2
2
F
F
...
F
+
+
+
2
3
25
setting is "Wye" to enable voltage harmonics metering.
SYNCHROCHECK 1(4)
0.0°
0.00 Hz
SYSTEM SETUP
6 ACTUAL VALUES
SYSTEM SETUP
AC INPUTS
6.3.4 SYNCHROCHECK
6.3.5 TRACKING FREQUENCY
menu. See the Power
POWER SYSTEM
6.3.6 FREQUENCY RATE OF CHANGE
(EQ 6.3)
(EQ 6.4)
GE Multilin