Calculation and Measurement of Sequence Parameters of Three-Core Submarine Cable with Semi-conductive Sheaths

As the scale of offshore wind power continues to expand, more and more three-core AC submarine cables have been put into construction. Submarine cables are the only way of offshore wind power transmission. The accurate acquisition of their sequence parameters is an important basis for planning, designing and analyzing offshore wind power systems. In view of the fact that the existing IEC standards do not have a formula corresponding to the parameters of submarine cables with semi-conductive sheaths, this paper uses a simulation method to calculate the sequence parameters of a 220 kV three-core AC semi-conductive submarine cable. Considering the semi-conductive layer of the cable and its more structures and laying environment, the sequence parameters are deduced and calculated taking into account the semi-conductive sheaths through the multi-conductor system modeling of cables and the application of the symmetrical component principle, and compared with the measured values. The results show that the sequence parameters can reflect the unknown material parameters and the submarine environment, and the simulation results are more accurate, which can provide reference for engineering designers.