Discussion
Which of the following statements are NOT true with respect to transformer construction?
1) The core of transformers is made up of low permeability material.
2) In shell type transformer LV and HV windings are wound on central limb.
3) The butt joints of the core are staggered to avoid continuous air gap.
4) For 50 Hz transformers the magnetic core is of 5 mm thickness.
Answer: D
Statement 1 is not true: the core of a transformer is made of a material of high permeability, such as silicon steel, so that the flux path has a low reluctance. Statement 2 is true, since in a shell type transformer both windings are wound on the central limb. Statement 3 is true, because the butt joints of the core are staggered so that there is no continuous air gap. Statement 4 is not true: the core of a 50 Hz transformer is laminated, with laminations less than 1 mm thick, not 5 mm. So statements 1 and 4 are not true, option (D).
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