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Overhead Line Constants Calculation Library

Author: Julius Susanto
Last update: January 2017

Reference:

  1. Dommel, H. W., “Electromagnetic Transients Program Reference Manual (EMTP Theory Book)”, Chapter 4, “Overhead Transmission Lines”.
  2. Arrillaga, J., and Watson, N. R., “Computer Modelling of Electrical Power Systems”, 2nd Edition, Wiley, 2005, Chapter 2.6

Functions:

  • calc_l_int Calculates internal inductance of solid or tubular conductor
  • calc_gmr Calculates geometric mean radius (GMR) of solid or tubular conductor
  • carsons Calculates Carson’s earth return correction factors Rp and Xp for self or mutual terms
  • calc_self_z Calculates self impedance term (in Ohm/km)
  • calc_mutual_z Calculates mutual impedance term (in Ohm/km)
  • calc_dubanton_z Calculates Dubanton approximation for self or mutual impedance (in Ohm/km)
  • calc_z_matrix Calculates primitive impedance matrix
  • calc_y_matrix Calculates primitive admittance matrix
  • calc_kron_z Calculates Kron reduced matrix

Features currently not supported:

  • Skin effect calculation for internal self impedance
  • Input data validation, e.g. check that all phase conductor vectors are the same size

Enums

Functions

  • calc_gmr
    Calculates geometric mean radius (GMR) of solid or tubular conductor Note that calculations assume uniform current distribution in the conductor, thus conductor stranding is not taken into account.
  • calc_l_int
    Calculates internal inductance of solid or tubular conductor Note that calculations assume uniform current distribution in the conductor, thus conductor stranding is not taken into account.
  • calc_mutual_z
    Calculates mutual impedance term (in Ohm/km)
  • calc_self_z
    Calculates self impedance term (in Ohm/km) NOTE: No allowance has been made for skin effects
  • carsons
    Calculates Carson’s earth return correction factors Rp and Xp for both self and mutual terms. The number of terms evaluated in the infinite loop is based on convergence to the desired error tolerance.