交流输电线路由于相线和地线的磁耦合而导致的地线损耗，逐渐成为电力网络经济运行的一个指标。目前研究者提出了多种新的地线接线方式来降低此损耗，这些措施主要包括分段绝缘和地线换位。以特高压线路为例，研究了不同相序下地线的感应电动势特性和不同导线换位方式下的地线损耗特性。指出了导线采用逆相序反向换位的方式，地线采用普通地线绝缘和换位的措施，可以最大程度降低地线损耗。

The power loss of ground wire, produced by the magnetic coupling between phase line and ground wire, is becoming a more and more important parameter for economical operation of the power network. There are a variety of measures to reduce the power loss, such as graded insulation and ground wire transposition. An example of UHV transmission line is presented in this paper to investigate the characteristics of induced electromotive force of ground wire and power loss under different phase sequences and conductor transposition modes. It is pointed out that the power loss can be reduced to a minimum by negative phase sequence and reverse transposition of conductor, as well as graded insulation and transposition of ground wire.