适用于GIL-架空混合线路距离保护的整定方法

Setting Method for Distance Protection of GIL Hybrid Overhead Lines

将GIL段串入架空线路后,线路阻抗特性会发生变化,对于阻抗参数敏感的距离保护,其保护范围会发生变化。为了使原有架空线路保护装置能够可靠保护混合线路,在理论分析的基础上,通过修改距离保护定值来维持保护装置保护范围,使得原架空线路保护装置在GIL-架空混合线路工况下仍然适用。计算方法在PSCAD仿真模型中得到了验证。

After stringing the GIL section into an overhead transmission line,the impedance characteristics of the line will change.For the distance protection sensitive to impedance parameters,the protection range will change.In order to make the original overhead line protection device reliably protect the mixed line,a method to maintain the protection scope of the protection device is proposed by modifying protection parameters of the distance protection,and the proposed method is verified in the PSCAD simulation model.