分流系数对架空避雷线热稳定校验的影响

Influence of Shunt Factor on Thermal Stability Checking of Overhead Grounding Wire

针对北京电网中日益突出的架空避雷线的热稳定问题,指出了目前根据线路总短路电流值选取架空避雷线截面是不准确的。文章通过建立数学模型,采用Matlab软件进行了计算,计算表明了分流系数对避雷线的截面选择影响显著,并用实例计算加以验证。文中的分析和计算方法可为更准确地进行架空避雷线的热稳定校验提供依据。文中还给出了考虑分流系数后GJ-50型架空避雷线的适用距离。

According to the problem of thermal stability checking of overhead grounding wire in Beijing power network, it is pointed out that the section of overhead grounding wire is selected based on total short-circuit current of the line, which has some shortcomings. The paper carried out the calculations adopting Matlab software through establishing mathematics model, and the calculations show that shunt factor has notable influence on selection of the section of overhead grounding wire, and through example calculation to verify. The analysis and calculation method given in the paper can offer the basis for thermal stability checking of overhead grounding wire accurately. The paper also gives the suitable distance of GJ-50 overhead grounding wire considering the shunt factor.