宝鸡—德阳±500 kV直流输电工程极1、极2系统分阶段投运，为保证在极2及双极系统调试期间极1系统能够安全稳定运行，必须对1极进行安全隔离。针对极1、极2系统之间的相互影响因素进行了详细分析，并归纳总结，提出了相应的软件、硬件安全技术隔离措施，可供后续有关直流工程建设和运行参考。

In the ±500 kV Baoji-Deyang HVDC project, Pole I and Pole II will put into operation in different stages. During the commissioning test of Pole II, the safe and stabe operation of Pole I is guaranteed by the isolation between two pole. In this paper, the interaction between two pole is analyzed in detail, factors are given and summarized. The isolation measures on both software and hardware are proposed, which can be further referenced by similar subsequent projects.