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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
M13052-21 v8
Refer to pre-configured configurations for details.
START: The start output indicates that
Idiff is in the operate region of the characteristic.
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.
6.2.3.2
Settings
M13052-28 v12
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 (
IBase), primary voltage (UBase) and primary
power (
SBase) are set in a Global base values for settings function GBASVAL.
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
GlobalBaseSel. The neutral current must always be larger than half of this
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/
IBase.
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/
IBase.
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.
Section 6
1MRK 505 343-UEN B
Differential protection
114
Application manual
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