常规接地极与共用接地极的接地性能与技术经济比较

Comparisons of Grounding Performances and Technical Economy between Regular Ground Electrode and Common Ground Electrode

共用接地极的接地性能和技术经济性与常规接地极的不同,比较常规接地极与共用接地极的接地性能与经济指标,可指导设计人员根据工程具体情况进行优化设计。结合多换流站同步运行的几种工况,针对常规接地极、多站共1极和多站共2极,在入地电流、接地电阻、地电位、经济性等方面进行了分析和比较。结果表明:不论从对周围环境的影响角度还是技术经济性,共用接地极比常规接地极更具有优势;其中多站共1极对极址要求较高,但在极址条件允许的情况下,其对跨步电压等电磁环境因子的影响范围小于多站共2极;多站共1极和多站共2极的建设投资处于相同水平,具体差别根据工程的实际情况而定。

The grounding performances and technical economy of common ground electrode are different from those of regular ground electrode, of which the comparisons between regular electrodes and common electrodes can help engineers optimizedly design electrodes. According to the major modes of multiple convert stations operating in synchronism, the grounding current, ground resistance, and economy etc are analyzed and compared for regular ground electrode, one common electrode and two common electrodes of multi-stations. It is shown that common electrode is better than regular electrode from both environmental influence and economy aspects, where the electrode site is exigent for one common electrode of multistations. If better electrode site is available, one common electrode has smaller electromagnetic influence range of step voltage than that of two common electrodes, of which both are on the same levels in the construction investments.