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Which of the following is NOT a VALID advantage of shell type transformer over core type transformer?

Which of the following is NOT a VALID advantage of shell type transformer over core type transformer? Correct Answer Maintenance is easy

Shell type transformer:

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  • The core of a single-phase shell type transformer is constructed with three limbs (legs).
  • This design increases the mechanical strength of the core.
  • It also improves the protection of windings from external mechanical shocks. The HV and LV windings are wound around the central limb.
  • The central limb carries the entire flux (ϕ), whereas the side limbs carry half of the flux (ϕ/2).
  • Hence, to accommodate the flux the cross-section of the central limb is twice than that of the side limbs.

​Advantages of shell-type transformer:

  • Mechanical & dielectric strength is high.
  • The copper requirement is less.
  • The windings of this transformer can be simply separated with the help of a sandwich coil to prevent leakage.
  • Losses are less.

Disadvantages of Shell-type transformer:

  • Maintenance of this transformer is not easy.
  • It needs special manufacturing services to design this transformer.

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