GE UR T60 - Synchrocheck

6-20 T60 Transformer Protection System GE Multilin
6.3 METERING 6 ACTUAL VALUES
6
 DEMAND menu. For each quantity, the relay displays the demand over the most recent demand time interval, the maxi-
mum demand since the last maximum demand reset, and the time and date stamp of this maximum demand value. Maxi-
mum demand quantities can be reset to zero with the CLEAR RECORDS  CLEAR DEMAND RECORDS command.
i) 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.
j) 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.
6.3.4 SYNCHROCHECK
PATH: ACTUAL VALUES  METERING  SYNCHROCHECK  SYNCHROCHECK 1(2)
The actual values menu for synchrocheck 2 is identical to that of synchrocheck 1. If a synchrocheck function setting is "Dis-
abled", the corresponding actual values menu item will not be displayed.
 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%
 SYNCHROCHECK 1

SYNCHROCHECK 1 DELTA
VOLT: 0.000 V
MESSAGE
SYNCHROCHECK 1 DELTA
PHASE: 0.0°
MESSAGE
SYNCHROCHECK 1 DELTA
FREQ: 0.00 Hz