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A delta connection is valuable because it

  • A.eliminates the need for any insulation between windings
  • B.provides a closed path for third harmonic currents
  • C.provides a neutral point for a four-wire supply
  • D.reduces the current in each winding for the same line current

Answer: B

Triple harmonics circulate within the delta rather than distorting the voltage or flowing in the neutral, which is why a delta winding is usual on at least one side. The winding current is \( 1/\sqrt{3} \) of the line current.

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