四边形特性距离保护躲负荷性能分析

Relation between load impedance and distance relay with quadrilateral characteristics

四边形特性的距离保护,其电阻分量可以单独整定,反应接地电阻的能力较强。本文对四边形特性距离保护躲负荷性能进行了研究,给出了可靠系数的计算公式。

Because the value of the resistance components can be set independently, a quadrilateral-characteristic distance relay is very sensitive to a large earthed resistance when faults.In view of that,the relation between the load impedance and the quadrilateral characteristics of a distance relay in R-X plane is analyzed in detail.And also,the method to reliability coefficient calculation is put forward.