operate with the maximum load current. The settings for all three stages are as in
Figure 449
.
For the application point of view, the suitable setting for instantaneous stage (I>>>)
in this example is 3 500 A (5.83 × I
2n
). I
2n
is the 1.2 multiple with nominal primary
current of the CT. For the CT characteristics point of view, the criteria given by
the current transformer selection formula is fulfilled and also the protection relay
setting is considerably below the F
a
. In this application, the CT rated burden could
have been selected much lower than 10 VA for economical reasons.
Requirements for measurement
transformers
1MRS758755 C
834 REC615 & RER615
Technical Manual
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