Which winding of the transformer has less cross-sectional area?

Which winding of the transformer has less cross-sectional area?

Right Answer is:

High Voltage Winding

SOLUTION

  • The number of turns on the primary and secondary windings depends upon their respective voltages.
  • We know that current density is defined as the ratio of current to perpendicular cross-section area through which current is crossing.
  • The value of current density of HV winding is more in comparison to LV winding because of better cooling of HV winding
  • Since HV winding is placed far from the core in Comparison to LV winding which is placed near to the core.
  • Current density is inversely proportional to the area of the core so the thin wire is used for HV winding.
  • Also as the resistance of winding is inversely proportional to the area of cross-section, the area of high voltage winding is less compared to low voltage winding.
  • Therefore HV winding has Low cross-sectional area.
  • A high-voltage winding has far more turns than a low-voltage winding.
  • On the other hand, the current in a high-voltage winding is much smaller, enabling us to use a smaller size conductor.
  • The result is that the amount of copper in the primary and secondary windings is about the same.
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