中文摘要：

由于零模参数受大地电阻率等因素影响，能量平衡保护采用了较为稳定的空间模量计算能量。超高压、特高压线路一般需要选相跳闸，基于空间模量1、模量2的能量平衡保护不具备天然选相功能。提出基于3个空间模量的具有选相功能的能量平衡保护新算法，实现了单相接地故障选相跳闸。ATP仿真验证了此算法的可行性。

英文摘要：

Owing to the influences of such factors as the earth resistivity on the zero module parameter, the stable space module is adopted to calculate energy for energy balance protection. In general, EHV and UHV transmission line protection needs to correctly select and switch off the faulty phase when single line to-ground fault occurs. As the energy balance protection based on spatial modules 1 and 2 does not possess the natural phase selecting function, a new algorithm for energy balance protection based on three modules in space is proposed, making it possible to switch off the faulty phase should single line-to-ground fault occur. The feasibility of the new algorithm is verified by ATP simulation.