方向式母线保护的探讨和应用

比较了几种常见母线保护的优缺点，在现有微机线路纵联保护的基础上，提出了新的方向式微机母线保护方案，利用分散的微机保护装置采集与母线相连的各回路上的故障电流方向，经过一定的逻辑判断可区分不同条件下母线内部故障和外部故障, 从原理上避免了电流互感器饱和因素的影响，而且构成简单，经济性能高，具有很强的实用性。

APPLICATION OF COMMUNICATION-BASED DIRECTIONAL BUSBAR PROTECTION

By analysis of present common used bus protection, it is pointed out that the distributed digital bus protection will be the major developing trend of digital bus protection. A new communication based directional bus protection scheme is introduced . It uses the direction of current sampled by distributed relays to distinguish the internal faults and external faults. With the low cost and simple structure, it is especially not affected by current transformer saturation.