输电线路的集成全频域保护

回顾了暂态保护和集成保护的发展历程,提出了一种集成全频域保护方案。该保护方案整合了传统的工频量保护算法和暂态量保护算法,将基于工频量和暂态量的保护算法分为单端保护、双端或多端保护和后备保护三个算法组。单端保护组包括基于工频量的常规距离保护和基于高频暂态量的边界和位置保护,它们基于本地单端电气量实现速动保护;双端或多端保护组由常规的差动保护和基于时间同步的暂态保护组成,它们都由连接线路两端之间的通信通道支持;后备保护组包括常规的方向保护和基于极性比较的暂态保护。最后,对全频域保护技术应用于超长距离半波长输电线的保护方案设计作了研究。

Integrated All Frequency Protection for Power Transmission Lines

An integrated all frequency protection scheme is presented in this paper based on a review of the development of transient based protection and integrated protection. Integrating the conventional power frequency protection algorithms and the transient based protection algorithms, the proposed scheme divides the protection algorithms based on power frequency and transient measurement into three groups: the single end protection group, double or multiple end protection group and backup protection protection group. The single end protection group includes conventional distance protections based on power frequency measurement and boundary and positional protections based on high frequency transient measurement, and these protections are employed to form an instant tripping protection group based on single local end measurement. The double or multiple end protection group consists of conventional current differential protection and time synchronizing transient protection, and these protections are supported by communication link through interconnecting line. The backup protection group includes conventional directional protection and transient protection based on polarity comparison. Finallly, a protection scheme designed for the ultra long length of the half wavelength transmission line is studied by integrating all frequency domain protection techniques.