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5.6 GROUPED ELEMENTS
g) VOLTS PER HERTZ (ANSI 24)
PATH: SETTINGS
GROUPED ELEMENTS
VOLTS/HZ 1
5
The per-unit volts-per-hertz (V/Hz) value is calculated using the maximum of the three-phase voltage inputs or the auxiliary
voltage channel Vx input, if the source is not configured with phase voltages. To use the V/Hz element with auxiliary volt-
age, set
SYSTEM SETUP
to the corresponding voltage input bank. If there is no voltage on the relay terminals in either case, the per-unit V/Hz value
is automatically set to "0". The per unit value is established as per voltage and nominal frequency power system settings as
follows:
1.
If the phase voltage inputs defined in the source menu are used for V/Hz operation, then "1 pu" is the selected
SETUP
AC INPUTS
SETUP
POWER SYSTEM
2.
If the voltage bank connection value is selected as "Delta", then the phase-to-phase nominal voltage is used to define
the per-unit value. If the voltage bank connection value is selected as "Wye", then the
ting further defines the operating quantity and per-unit value for this element. If the voltage mode is set as "Phase-
phase", then the operating quantity for this element will be phase-to-phase nominal voltage. Likewise, if the voltage
mode is set to "Phase-ground", then the operating quantity for this element will be the phase-to-ground nominal volt-
age. It is beneficial to use the phase-to-phase voltage mode for this element when the T60 device is applied on an iso-
lated or resistance-grounded system.
3.
When the auxiliary voltage Vx is used (regarding the condition for "None" phase voltage setting mentioned above),
then the 1 pu value is the
divided by the
SYSTEM SETUP
4.
If V/Hz source is configured with both phase and auxiliary voltages, the maximum phase among the three voltage
channels at any given point in time is the input voltage signal for element operation, and therefore the per-unit value
will be calculated as described in Step 1 above. If the measured voltage of all three phase voltages is 0, than the per-
unit value becomes automatically 0 regardless of the presence of auxiliary voltage.
5-224
SETTING GROUP 1(6)
VOLTS/HZ 1 FUNCTION:
Disabled
VOLTS/HZ 1 SOURCE:
MESSAGE
SRC 1
VOLTS/HZ 1 VOLTAGE:
MESSAGE
MODE: Phase-ground
VOLTS/HZ 1 PICKUP:
MESSAGE
1.00 pu
VOLTS/HZ 1 CURVE:
MESSAGE
Definite Time
VOLTS/HZ 1 TD
MESSAGE
MULTIPLIER:
VOLTS/HZ 1
MESSAGE
T-RESET: 1.0 s
VOLTS/HZ 1 BLOCK:
MESSAGE
Off
VOLTS/HZ 1 TARGET:
MESSAGE
Self-reset
VOLTS/HZ 1 EVENTS:
MESSAGE
Disabled
SIGNAL SOURCES
SOURCE 1(6)
VOLTAGE BANK N
PHASE VT N SECONDARY
NOMINAL FREQUENCY
SYSTEM SETUP
AC INPUTS
POWER SYSTEM
T60 Transformer Protection System
VOLTAGE ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: Phase-ground, Phase-phase
Range: 0.80 to 4.00 pu in steps of 0.01
Range: Definite Time, Inverse A, Inverse B, Inverse C,
FlexCurve A, FlexCurve B, FlexCurve C,
FlexCurve D
Range: 0.05 to 600.00 in steps of 0.01
1.00
Range: 0.0 to 1000.0 s in steps of 0.1
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
SOURCE 1(6) PHASE VT
setting, divided by the divided by the
setting.
VOLTAGE BANK N
setting.
NOMINAL FREQUENCY
5 SETTINGS
VOLTS/HZ 1(2)
to
None
and
"
"
SOURCE 1(6) AUX VT
SYSTEM
SYSTEM
VOLTS/HZ 1 VOLTAGE MODE
setting
AUXILIARY VT N SECONDARY
GE Multilin
set-
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