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Which change would NOT reduce the core loss of a transformer?

  • A.increasing the flux density at which the core is worked
  • B.using thinner laminations of the same material
  • C.using a steel of higher silicon content
  • D.using grain-oriented steel with the flux along the rolling direction

Answer: A

Loss rises steeply with flux density, roughly as its square for eddy currents and as a power near 1.6 for hysteresis, so working the core harder increases the loss. The other three all reduce it, which is why all three are used together in a modern core.

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