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Measured Impedance Characteristic Analysis of Grounding Distance Protection Applied in Double/Multi-circuit Transmission Lines
Author(s): 
Pages: 24-28,79
Year: Issue:  10
Journal: Guangdong Electric Power

Keyword:  同塔线路距离保护测量阻抗安全性;
Abstract: 针对同塔双回或多回并架输电线路给接地距离保护带来的新问题,通过分析同塔线路在并列运行、一端分裂运行、两端分裂运行等不同结构,两端系统发生强弱变化以及在不同接线结构和运行方式下线路发生故障时接地距离保护的测量阻抗,得出了同塔双回线路对接地距离保护影响的基本规律,即平行线路零序电流影响故障线路保护测量阻抗的规律,并证明该规律可以指导同塔线路接地距离保护的整定计算及安全性评价.
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