Tracking Frequency; Flexelements - GE T35 UR Series Instruction Manual

6.3 METERING
The metered values for real, reactive, and apparent power, as well as power factor, are displayed in this menu. The "SRC
1" text is replaced by whatever name was programmed by the user for the associated source (see

SETUP SIGNAL SOURCES
When VTs are configured in wye, the T35 calculates power in each phase and three-phase power is measured as
When VTs are configured in delta, the T35 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
g) FREQUENCY METERING
PATH: ACTUAL VALUES
 FREQUENCY
 SRC 1
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
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
final frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
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
Power System section of chapter 5 for additional details.
PATH: ACTUAL VALUES
 FLEXELEMENT 1

The operating signals for the FlexElements are displayed in pu values using the following definitions of the base units.
6-18
SRC 1 POWER FACTOR
MESSAGE
φa:
SRC 1 POWER FACTOR
MESSAGE
φb:
SRC 1 POWER FACTOR
MESSAGE
φc:
).
S = V x Î
A
S = V
 
METERING SOURCE SRC 1
SRC 1 FREQUENCY:
0.00 Hz
 settings). The signal used for frequency estimation is low-pass filtered. The
POWER SYSTEM
 
METERING

TRACKING FREQUENCY

TRACKING FREQUENCY:
60.00 Hz
setting in the
SETTINGS
 
METERING

FLEXELEMENTS

FLEXELEMENT 1
OpSig: 0.000 pu
T35 Transformer Protection System
1.000
1.000
1.000
+ V x Î + V x Î
A B B C C
x Î + V x Î
AB A CB C

FREQUENCY

SETTINGS SYSTEM SETUP

SYSTEM SETUP

FLEXELEMENT 1(16)
6 ACTUAL VALUES

SETTINGS
 ).
SIGNAL SOURCES
6.3.4 TRACKING FREQUENCY
 menu. Refer to the
POWER SYSTEM
6.3.5 FLEXELEMENTS
SYSTEM
(EQ 6.1)
(EQ 6.2)
GE Multilin