ANSI05000213 V3 EN-US
Figure 65: Connection of restricted earth-fault, low impedance function REFPDIF
(87N) for a solidly grounded reactor
7.3.2.5 Multi-breaker applications
M13048-23 v9
Multi-breaker arrangements including ring, one breaker-and-a-half, 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 (87N) 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
66.
1MRK 504 163-UUS A Section 7
Differential protection
Transformer protection RET670 2.2 ANSI 181
Application manual
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