Structurally incomplete model. Use only as component within appropriate complete model.
Defines Y-topology transform of voltage and current variables.
Definitions
v_term, i_term: terminal voltage and current v_cond, i_cond: voltage and current across conductor, (terminal to neutral point)
Relations, zero-component and neutral point (grounding)
  v_cond = v_term - {v_n, v_n, v_n}
  i_term = i_cond
  i_n = sum(i_term)
Note: parameter sh (phase shift) not used.