GE L60, Instruction Manual, Page: 330 / 498

6-14 L60 Line Phase Comparison Relay GE Multilin
6.3 METERING 6 ACTUAL VALUES
6
Four identical Source menus are available. 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
).
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.
6.3.3 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
"Disabled", the corresponding actual values menu item will not be displayed.
6.3.4 TRACKING FREQUENCY
PATH: ACTUAL VALUES METERING TRACKING FREQUENCY
The tracking frequency is displayed here. The frequency is tracked based on configuration of the reference source. The
TRACKING FREQUENCY
is based upon positive sequence current phasors from all line terminals and is synchronously
adjusted at all terminals. If currents are below 0.125 pu, then the
NOMINAL FREQUENCY
is used.
MESSAGE
SRC 1 APPARENT PWR
φ
a: 0.000 VA
MESSAGE
SRC 1 APPARENT PWR
φ
b: 0.000 VA
MESSAGE
SRC 1 APPARENT PWR
φ
c: 0.000 VA
MESSAGE
SRC 1 POWER FACTOR
3
φ
: 1.000
MESSAGE
SRC 1 POWER FACTOR
φ
a: 1.000
MESSAGE
SRC 1 POWER FACTOR
φ
b: 1.000
MESSAGE
SRC 1 POWER FACTOR
φ
c: 1.000
FREQUENCY
SRC 1
SRC 1 FREQUENCY:
0.00 Hz
SYNCHROCHECK 1 SYNCHROCHECK 1 DELTA
VOLT: 0.000 V
MESSAGE
SYNCHROCHECK 1 DELTA
PHASE: 0.0°
MESSAGE
SYNCHROCHECK 1 DELTA
FREQ: 0.00 Hz
TRACKING FREQUENCY TRACKING FREQUENCY:
60.00 Hz