Question
Download Solution PDFA single-phase transformer is fed with a rated supply and operates at no load. If the core of the transformer is air-core, then the waveform of steady state magnetising current drawn from the supply would be a ___________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFBH curve
The core of the transformer is made up of ferromagnetic material like CRGO.
The BH curve of these materials is not linear.
The flux density (B) tends to saturate after a specific value of current intensity (H).
Therefore, the magnetizing current drawn from the supply becomes a flat-topped wave.
For an air core transformer, the BH curve is a straight line, hence the waveform of steady-state magnetizing current drawn from the supply would be a pure sinusoidal wave.
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