抄録
Recently, many long cable lines are under construction and planned. A reliable operation of a cable system necessitates an accurate calculation of sequence impedances of the system. It has been a common practice that those sequence impedances or currents are measured after the installation and it is difficult to predict those values beforehand. This paper derives theoretical formulas of the sequence currents for a cross-bonded cable and a normal-bonded cable. The accuracy of the proposed formulas is verified through a comparison with EMTP simulations.
