Reactor
REFPDIF
I3PW1CT1
I3P
IdN/I
IEC09000112-4.vsd
IEC09000112-4 V2 EN-US
Figure 37: Connection of restricted earth-fault, low impedance function
REFPDIF for a solidly earthed reactor
6.2.2.5 Multi-breaker applications
M13048-23 v9
Multi-breaker arrangements including ring, one and a half breaker, double breaker
and mesh corner arrangements have two sets of current transformers on the phase
side. The restricted earth-fault protection, low impedance function REFPDIF has
inputs to allow two current inputs from each side of the transformer. The second
winding set is only applicable for autotransformers.
A typical connection for a star-delta transformer is shown in figure
38.
1MRK 504 169-UEN A Section 6
Differential protection
Transformer protection RET650 2.2 IEC 97
Application manual
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