• Inverse Time Over Current IDMT curve: IEC very inverse, with multiplier k=1
• Pickup current of 185% of generator rated current at rated generator voltage
•
Pickup current 25% of the original pickup current value for generator voltages
below 25% of rated voltage
To ensure proper operation of the function:
1. Set Operation to Enabled
2. Set GlobalBaseSel to the right value in order to select the Global Base Values
Group with VBase and IBase equal to the rated phase-to-phase voltage and the
rated phase current of the generator.
3. Connect three-phase generator currents and voltages to VRPVOC (51V) in the
application configuration.
4. Select Characterist to match the type of overcurrent curves used in the network
IEC Very inv.
5. Set the multiplier k = 1 (default value).
6. Set tDef_OC = 0.00 s, in order to add no additional delay to the trip time defined
by the inverse time characteristic.
7. If required, set the minimum operating time for this curve by using the parameter
t_MinTripDelay (default value 0.05 s).
8. Set PickupCurr to the value 185%.
9. Set VDepMode to Slope (default value).
10. Set VDepFact to the value 25% (default value).
11. Set VHighLimit to the value 100% (default value).
All other settings can be left at the default values.
9.14.3.3 General settings
GUID-AADD7497-E488-4047-A4DD-18B4828FA5C2 v2
Operation: With the parameter Operation the function can be set Enabled/Disabled.
Common base IED values for primary current (IBase), primary voltage (VBase) and
primary power (SBase) are set in Global base values for settings function GBASVAL.
Setting GlobalBaseSel is used to select a GBASVAL function for reference of base
values.
IBase: The parameter IBase is set to the generator rated current according to
equation
233.
Section 9 1MRK 502 071-UUS A
Current protection
430 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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