Thursday, 2 May 2013

Characteristics of DELTA-DELTA connection

  • In delta-delta connection, dissimilar ends join together.
  • The system is three phase, 3 wire system.
  • In delta-delta connection line current is given by IL = IP√3.
  • In star-star connection line voltage and phase voltage are equal  VL = VP.
  • Line currents are 120 degree apart.
  • Line currents are 120 degree ahead w.r.t phase current.
  • Zero sequence current and circulating current can not be avoided.
  • As phase voltage is greater so large number of turns are required and hence more insulation is required.
  • Due to low currents winding must have small cross sectional area.
  • This connection is suitable for low voltage transformers.


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