Selection criteria
for current trans-
formers
General
Do not use current transformers with a voltage output.
Current transformers are directional. If they are mounted backwards or with swapped
wires, the measured power will be negative.
Primary current
Maximum current per phase. A current transformer with a primary current greater than
the maximum expected current per phase should be selected. The closer the expected
current is to this value, the more precise the measurement will be.
Secondary current
The current transformer must supply alternating current at a nominal current of 1 or 5 A.
The nominal values for the current transformer are listed in the current transformer data
sheet.
Power
The Fronius Smart Meter needs 0.3 VA to carry out its measurements. Losses also occur
on the outgoing and return leads. The power of the current transformer must be greater
than the sum total of the power of the Fronius Smart Meter and the leads. The higher the
power, the better.
11
EN
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