GE C60, Instruction Manual

Page: 441 / 682

GE Multilin C60 Breaker Protection System 6-21
6 ACTUAL VALUES 6.3 METERING
6
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.
6.3.3 SYNCHROCHECK
PATH: ACTUAL VALUES

METERING

SYNCHROCHECK

SYNCHROCHECK 1(4)
If a synchrocheck function setting is "Disabled", the corresponding actual values menu item is not displayed.
6.3.4 TRACKING FREQUENCY
PATH: ACTUAL VALUES

METERING

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
setting in the
SETTINGS

SYSTEM SETUP

POWER SYSTEM
menu. See the Power
System section of chapter 5 for details.
6.3.5 FLEXELEMENTS
PATH: ACTUAL VALUES

METERING

FLEXELEMENTS

FLEXELEMENT 1(8)
The operating signals for the FlexElements are displayed in pu values using the following definitions of the base units.

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

FLEXELEMENT 1

FLEXELEMENT 1
OpSig: 0.000 pu
Table 6–2: FLEXELEMENT BASE UNITS (Sheet 1 of 2)
BREAKER ACC ARCING AMPS
(Brk X Acc Arc Amp A, B, and C)
BASE = 2000 kA
2
× cycle
BREAKER ARCING AMPS
(Brk X Arc Amp A, B, and C)
BASE = 1 kA
2
×
cycle
DCmA BASE = maximum value of the
DCMA INPUT MAX
setting for the two transducers configured
under the +IN and –IN inputs.
FAULT LOCATION BASE = Line Length as specified in Fault Report
FREQUENCY f
BASE
= 1 Hz
PHASE ANGLE
ϕ
BASE
= 360 degrees (see the UR angle referencing convention)
POWER FACTOR PF
BASE
= 1.00
RTDs BASE = 100°C
SOURCE CURRENT I
BASE
= maximum nominal primary RMS value of the +IN and –IN inputs