哈密南-郑州±800 kV特高压直流输电系统中哈密接地极与西气东输管道最近距离为44 km。通过在西气东输天然气管道沿线布置电位监测点，测得直流输电系统单极大地回线方式运行时，管地电位的变化情况；通过对测试数据的分析处理，获得了哈密接地极对西气东输天然气管道管地电位的影响范围和影响程度，掌握了直流输电系统不同运行模式下，对管地电位的影响规律。

The minimum distance between the Hami ground electrode in Hami South-Zhengzhou ±800 kV ultra high voltage direct current (HVDC) transmission system and the West-East gas pipeline system is 44 km. The change of pipe-to-soil potential was monitored and tracked along the West-East gas pipelines during the periods of the transmission line operating in the monopolar configuration with earth return. By analyzing the test data, the interference range and degree of Hami grounding electrode to the West-East gas pipeline were obtained, and the interference law to the pipe-to-soil potential was also mastered under different operating modes of HVDC.