REFPDIF
I3PW1CT1
I3P
IdN/I
I3PW1CT2
Protected
winding
IEC09000113-3.vsd
IEC09000113-3 V2 EN-US
Figure 44: Connection of Restricted earth fault, low impedance function REFPDIF in
multi-breaker arrangements
6.2.2.6
CT earthing direction
M13048-29 v12
To make the restricted earth-fault protection REFPDIF operate correctly, the main CTs are
always supposed to be star -connected. The main CT's neutral (star) formation can be
positioned in either way,
ToObject or FromObject. However, internally REFPDIF always uses
reference directions towards the protected transformers, as shown in Figure
always measures the primary currents on all sides and in the neutral of the power transformer
with the same reference direction towards the power transformer windings.
The earthing can be freely selected for each of the involved current transformers.
6.2.3
Setting guidelines
IP14942-1 v1
6.2.3.1
Setting and configuration
M13052-3 v3
Recommendation for analog inputs
M13052-8 v9
I3P: Neutral point current ( All analog inputs connected as 3Ph groups in ACT).
I3PW1CT1: Phase currents for winding 1 first current transformer set.
I3PW1CT2: Phase currents for winding1 second current transformer set for multi-breaker
arrangements. When not required configure input to "GRP-OFF".
I3PW2CT1: Phase currents for winding 2 first current transformer set. Used for
autotransformers.
I3PW2CT2: Phase currents for winding 2 second current transformer set for multi-breaker
arrangements. Used when protecting an autotransformer. When not required, configure input
to "GRP-OFF".
Recommendation for Binary input signals
M13052-17 v7
Refer to the pre-configured configurations for details.
1MRK 505 343-UEN B
Section 6
Differential protection
113
Application manual
Содержание Relion 670 series
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