Settings; Additional Security Logic For Differential Protection Ldrgfc; Identification - ABB RELION 670 Series Applications Manual

1MRK 504 152-UEN B
BLOCK: The input will block the operation of the function. Can be used, for example, to block
for a limited time the operation during special service conditions.
Recommendation for output signals
Refer to pre-configured configurations for details.
START: The start output indicates that
TRIP: The trip output is activated when all operating criteria are fulfilled.
DIROK: The output is activated when the directional criteria has been fulfilled.
BLK2H: The output is activated when the function is blocked due to a too high level of second
harmonic.
6.3.3.2

Settings

The parameters for the restricted earth-fault protection, low impedance function REFPDIF are
set via the local HMI or PCM600.
Common base IED values for primary current (
power (
GlobalBaseSel : It is used to select a GBASVAL function for reference of base values.
Operation : The operation of REFPDIF can be switched On / Off .
IdMin : The setting gives the minimum operation value. The setting is in percent of the IBase
value of the chosen
value. A normal setting is 30% of power transformer-winding rated current for a solidly
earthed winding.
CTFactorPri1 : A factor to allow a sensitive function also at multi-breaker arrangement where
the rating in the bay is much higher than the rated current of the transformer winding. The
stabilizing can then be high so an unnecessary high fault level can be required. The setting is
normally 1.0 but in multi-breaker arrangement the setting shall be CT primary rating/
CTFactorPri2 : A factor to allow a sensitive function also at multi-breaker arrangement where
the rating in the bay is much higher than the rated current of the transformer winding. The
stabilizing can then be high so an unnecessary high fault level can be required. The setting is
normally 1.0 but in multi-breaker arrangement the setting shall be CT primary rating/
CTFactorSec1 : See setting CTFactorPri1 . Only difference is that CTFactorSec1 is related to W2
side.
CTFactorSec2 : See setting CTFactorPri2. Only difference is that CTFactorSec2 is related to W2
side.
6.4 Additional security logic for differential protection
LDRGFC
6.4.1

Identification

Function description
Additional security logic for
differential protection
Application manual
SBase ) are set in a Global base values for settings function GBASVAL.
GlobalBaseSel . The neutral current must always be larger than half of this
Idiff is in the operate region of the characteristic.
IBase ), primary voltage ( UBase ) and primary
IEC 61850 IEC 60617
identification identification
LDRGFC -
Section 6
Differential protection
M13052-21 v8
M13052-28 v12
IBase .
IBase .
GUID-0E064528-0E70-4FA1-87C7-581DADC1EB55 v2
GUID-3081E62B-3E96-4615-97B8-2CCA92752658 v2
ANSI/IEEE C37.2
device number
11
141