5. Installation instructions
33 User manual RHF-Active
5.3.7 Selection of current transformers
Selection of current transformers depends on the load current of the application. Applicable are
current transformers in the range of 5/5 to 10000/5. The transfer ratio must be adjusted in the
correlated parameter of the software. For optimal performance, the nominal current of the
current transformer must not be much higher than the load current of the application (e.g. load
current 95A => current transformer 100A)
5.3.8 Modification of wiring when using current transformers with high ratio
If there is no current transformer with optimal ratio available, at push through transformers the
primary conductor may be lead through the transformer two or several times. Not only in this
case it is very important to observe that the direction of energy flow in the conductor and the
marked direction on the transformer match. The Software adjustment must be in accordance to
the final ratio.
If e.g. a 100A CT is used, but the wire is loped through. The setting in the software must be 50A.
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