快速后备保护研究

RESEARCH ON FAST OPERATING BACKUP PROTECTION

电力系统继电保护中后备保护按阶梯形配置整定 ,必然带来主干电网和发电厂后备保护动作时间太长、影响电网安全的问题。提出建立一种新的快速后备保护系统的思想 ,描述了变电站快速后备保护系统的结构和运行原理 ,建立了动作逻辑方程式。采用文中所述方法 ,变电站后备保护动作时间将小于 1 s。

Setting backup protection according to step principle will always lead to long fault clearing time of relays in backbone network as well as power plants, and further a threat against security of power network. This article presents a new idea of fast operating backup protection system. Basic structure and operation principle of this fast backup relay system in a substation are described, and then logical operation equations are established. Using this method, the backup relay in substations will operate within 1 s, and thus largely reduce the fault clearing time of backup relays of the whole network.