中文摘要：

±800 kV特高压直流输电线路故障类型的正确判别是国家电网安全稳定运行的重要保证。针对目前基于行波保护的装置在实际运行中存在的易拒动和易误动的问题,本文研究了基于暂态电压和暂态能量的两种暂态特性分析与故障类型甄别原理。然后在介绍可拓工程原理的基础上,应用可拓学中的物元模型将两种故障类型识别判据进行可拓融合,提出了用于区分输电线路发生单极接地故障、双极接地故障、非故障性雷击和故障性雷击四种暂态状况的识别判据。

英文摘要：

Correct identification of fault-type for ±800 kV ultra-high voltage direct current transmission lines is an important guarantee for safe and stable operation of state grid.We investigate transient characteristics analysis and fault identification principle of transient voltage and transient energy for not easy to action and easy false action issues of a traveling wave protection device.We then employ the matter-element model from extension engineering to fuse the two fault-type identification criteria based on the principle of extension engineering.We eventually present a fault-type identification criterion to distinguish single-pole ground fault,double-pole ground fault,fault lightning stroke and non-fault lightning stroke.