Harmonic impedance measurement on submarine cable

The lumped equivalent circuit parameters and distributed parameters of a line at high frequency are a little different from those at power frequency, because of distribution effects. The paper derives the formulas to get the lumped equivalent circuit parameters and distributed parameters from open circuit and short circuit harmonic impedance, and the actual measurement was carried out on a three phases of 500kV single-core submarine cables. The line parameters at harmonic frequency are also calculated and compared with the actual measurement. Some phenomena is expecting further exploration.