Study on Parameter Unbalance of 500 kV Double Circuit Cable Line Considering Different Arrangement

The balance of line parameters has an important impact on the safe operation of power grid. In this paper, the electromagnetic transient simulation program (EMTP) is used to calculate and analyze the unbalanced degree of the parameters of the double circuit cable lines with different arrangements such as horizontal, vertical and zigzag. The results show that: the cross-linking of cable metal sheath and grounding resistance have a certain influence on cable sequence impedance, the cable arrangement and cross-linking of metal sheath affect the negative sequence imbalance of the line, and the electromagnetic imbalance of the line can reach the lowest when ABC/CBA phase sequence arrangement is adopted in the horizontal arrangement of double circuit cable lines.