GE B30 UR Series, Instruction Manual

Page: 342 / 582

6-16 B30 Bus Differential System GE Multilin
6.3 METERING 6 ACTUAL VALUES
6
f) FREQUENCY
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.
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. Refer to the
Power System section of chapter 5 for additional 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.

FREQUENCY

SRC 1
SRC 1 FREQUENCY:
0.00 Hz

TRACKING FREQUENCY

TRACKING FREQUENCY:
60.00 Hz

FLEXELEMENT 1

FLEXELEMENT 1
OpSig: 0.000 pu
Table 6–2: FLEXELEMENT BASE UNITS
BUS DIFFERENTIAL
RESTRAINING CURRENT
(Bus Diff Mag)
I
BASE
= maximum primary RMS value of the +IN and –IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
BUS DIFFERENTIAL
RESTRAINING CURRENT
(Bus Rest Mag)
I
BASE
= maximum primary RMS value of the +IN and – IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
DCmA BASE = maximum value of the
DCMA INPUT MAX
setting for the two transducers configured
under the +IN and –IN inputs.
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
SOURCE POWER P
BASE
= maximum value of V
BASE
× I
BASE
for the +IN and –IN inputs
SOURCE VOLTAGE V
BASE
= maximum nominal primary RMS value of the +IN and –IN inputs