GROUPED ELEMENTS
5.7.14.7 Volts per hertz (ANSI 24, IEC PVPH)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) VOLTAGE ELEMENTS VOLTS/HZ 1(2)
VOLTS/HZ 1
5
For the L90, this feature is optional and requires software option 24 or 83. Check the order code of your device.
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
voltage, set
SYSTEM SETUP SIGNAL SOURCES SOURCE 1(6) SOURCE 1(6) PHASE VT
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 VOLTAGE BANK N PHASE VT N SECONDARY
POWER SYSTEM NOMINAL FREQUENCY
5-308
Figure 5-172: Auxiliary overvoltage logic
VOLTS/HZ 1 FUNCTION:
Disabled
VOLTS/HZ 1 SOURCE:
SRC 1
VOLTS/HZ 1 VOLTAGE
MODE: Phase-ground
VOLTS/HZ 1 PICKUP:
1.00 pu
VOLTS/HZ 1 CURVE:
Definite Time
VOLTS/HZ 1 TD
MULTIPLIER: 1.00
VOLTS/HZ 1
T-RESET: 1.0 s
VOLTS/HZ 1 BLOCK:
Off
VOLTS/HZ 1 TARGET:
Self-reset
VOLTS/HZ 1 EVENTS:
Disabled
setting.
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
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
Range: 0.0 to 1000.0 s in steps of 0.1
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
to "None" and
setting, divided by the divided by the
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
to
SOURCE 1(6) AUX VT
SYSTEM
SYSTEM SETUP