微机距离保护比相判据的完善性研究与应用

STUDY AND APPLICATION ABOUT CRITERION COMPARING PHASE TO COMPUTERIZED DISTANCE PROTECTION

具有新判据的距离比相元件与选相元件配合，能够获得理想特性，全新的比相原理是新型距离继电器的主要特色。文章讨论了由于电力系统负载不对称系统各阻抗角不相等的条件下，如何消除比相判据中的动作死区和“分段漂移”；当系统发生三相对称短路时，比相方式缺陷的改进措施。

Distance comparing_phase cell having new criterion is combined with selecting_phase cell, can obtain idea specific property. The new comparing_phase principle is the main charactistic of new distance protection, The paper discussed how to remove action_death_area of phase comparing and judgment in the case of electric power system resistance and reactance angle not equal; and discussed the improving measure when systems append three_phase symmetry hitch.