后备保护不可或缺，特别作为相邻设备的远后备保护功能尤为重要。由于距离保护仅仅依赖本地信息构成，容易实现且性能稳定，因此，所有高压输电线路都把距离保护作为后备保护。遗憾的是，后备保护在大停电过程中所起的作用是消极的，可以说它导致了电网连锁跳闸。因此，有必要重新认识后备保护的作用及其构成方式。提出了一种集成后备保护方案，它把同一个变电站所有被保护设备的后备保护集成在一个装置或者系统中，而所有设备的保护只包含主保护功能。这样的方案有利于构成性能完善的后备保护方案，也可以有效减小大停电的范围。%Backup protection is indispensable, particularly as a remote backup protection of neighboring devices. Since the distance protection only depends on local information, which is easy to implement and has stable performance, distance protection is regarded as backup protection of transmission lines. Unfortunately, the backup protection has played a negative role during the blackouts, and sometimes caused the cascading tripping. Therefore, it is necessary to re-recognize the role and the scheme of backup protection. This paper presents an integrated backup protection scheme, which integrates all backup protection of equipments in the same substation in one device or system. And all protections to equipment only contain the main protection. Such scheme can constitute backup protection with better performance and effectively reduce the scope of the blackout.
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