Synchrocheck; Tracking Frequency - GE D30 Instruction Manual

CHAPTER 6: ACTUAL VALUES
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
).
SOURCES
When VTs are configured in wye, the D30 calculates power in each phase and three-phase power is measured as
When VTs are configured in delta, the D30 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
6.3.2.7 Frequency metering
ACTUAL VALUES  METERING  SOURCE SRC 1  FREQUENCY
 FREQUENCY
 SRC 1
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
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  POWER SYSTEM
frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.

6.3.3 Synchrocheck

ACTUAL VALUES  METERING  SYNCHROCHECK  SYNCHROCHECK 1(4)
 SYNCHROCHECK 1

If a synchrocheck function setting is "Disabled," the corresponding actual values menu item does not display.

6.3.4 Tracking frequency

ACTUAL VALUES  METERING  TRACKING FREQUENCY
 TRACKING FREQUENCY

The tracking frequency displays 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.
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
S = V x Î + V x Î + V
A A B B
S = V x Î + V
AB A CB
SRC 1 FREQUENCY:

0.00 Hz
SETTINGS  SYSTEM SETUP  SIGNAL SOURCES
settings). The signal used for frequency estimation is low-pass filtered. The final
SYNCHROCHECK 1 DELTA

VOLT: 0.000 V
SYNCHROCHECK 1 DELTA

PHASE: 0.0°
SYNCHROCHECK 1 DELTA

FREQ: 0.00 Hz
TRACKING FREQUENCY

60.00 Hz
setting in the
SETTINGS  SYSTEM SETUP  POWER SYSTEM
SETTINGS  SYSTEM SETUP  SIGNAL
x Î
C C
x Î
C
).
METERING
Eq. 6-1
Eq. 6-2
menu. See the Power
6-17
6