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in Grade 12 by Master (810k points)
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Vlp           = 6.6 KV
Vps          = 230 V
Ils             = 30 A
Pout        = 15 KW
Cos Ɵ = 0,8

  1. Calculate the primary phase voltage 
  2. Calculate the secondary phase current 
  3. Calculate the primary phase current 
  4. Calculate the turns ratio  

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Primary phase voltage.

  1. VL = VPH
    ∴VPH = 6.6 KV
  2. IL = IP
    ∴IP = 30 A
  3. IPH(P) = LPH X VPH(S)
                       VPH(P)
               = 30 X 230
                     6600
               = 1.04 A
  4. NP = IPH(S)
    NS     IPH(p)
    NP = 30  
    NS   1.04 
    NP :NS = 30:1

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