new_contents: """This module performs network transformations.
  
  Copyright 2020 Michael Hayes, UCECE
  
  """
  
  
  def Z_wye_to_delta(Z1, Z2, Z3):
      """Perform wye to delta transformation of three impedances.
  
      This is equivalent to a tee-pi transform or a star-mesh transform."""
  
      N = Z1 * Z2 + Z1 * Z3 + Z2 * Z3
      
      Za = N / Z1
      Zb = N / Z2
      Zc = N / Z3
  
      return Za, Zb, Zc
  
  
  def Z_delta_to_wye(Za, Zb, Zc):
      """Perform wye to delta transformation of three impedances.
  
      This is equivalent to a pi-tee transform or a mesh-star transform."""    
  
      D = Za + Zb + Zc
      
      Z1 = Zb * Zc / D
      Z2 = Za * Zc / D
      Z3 = Za * Zb / D
  
      return Z1, Z2, Z3
  
  
  def Y_delta_to_wye(Ya, Yb, Yc):
      """Perform wye to delta transformation of three admittances.
          
      This is equivalent to a tee-pi transform or a star-mesh transform."""
  
      N = Ya * Yb + Ya * Yc + Yb * Yc
      
      Y1 = N / Ya
      Y2 = N / Yb
      Y3 = N / Yc
  
      return Y1, Y2, Y3
  
  
  def Y_wye_to_delta(Y1, Y2, Y3):
      """Perform wye to delta transformation of three admittances.
  
      This is equivalent to a pi-tee transform or a mesh-star transform."""    
  
      D = Y1 + Y2 + Y3
      
      Ya = Y2 * Y3 / D
      Yb = Y1 * Y3 / D
      Yc = Y1 * Y2 / D
  
      return Ya, Yb, Yv
  
  
  
  
  
subject: Add wye-delta and delta-wye transformations