What would you use for the core in a generator current transformer?
- Air core.
- Laminated core.
- Steel Core.
Explanation from PART66Online
A current transformer carrying alternating flux needs a laminated soft-iron core to provide a low-reluctance path while keeping eddy-current losses low. A solid steel block would suffer heavy eddy currents and heating, and an air core would couple the flux too poorly for accurate current sensing.
A
Afshinarabi asked · 20 May 2026
A laminated core (typically made of thin, stacked sheets of grain-oriented silicon steel) is the standard and most efficient choice
Community Comments (1)
D
Devraj_S
21 May 2026
The correct option is B. Current transformer cores are constructed from thin laminated silicon-steel sheets in order to minimise eddy current losses while retaining the high permeability required for accurate ratio reproduction. Solid steel exhibits excessive eddy current heating, and an air core would not provide sufficient magnetic coupling for a metering CT, per Module 3.15 transformers.
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