平滑铝套和皱纹铝套XLPE绝缘高压电缆载流量研究

Study on the Current Carrying Capacity of XLPE Insulated High Voltage Cables with Smooth Aluminum Sheath and Corrugated Aluminum Sheath

载流量是电缆运行重要参数之一,为了研究平滑铝套和皱纹铝套的不同金属屏蔽形式对XLPE(交联聚乙烯)绝缘电缆载流量的影响,选用220 kV 2500 mm^(2)超高压电缆作为试品,通过热分析法对平滑铝套和皱纹铝套电缆载流量进行理论计算,通过COMSOL软件对平滑铝套电缆载流量进行有限元仿真计算,再通过通流法对平滑铝套与皱纹铝套电缆进行载流量对比验证试验。试验验证表明平滑铝套比皱纹铝套屏蔽结构的高压电缆载流量提升了5.6%,有限元仿真计算的载流量与通流法验证结果仅相差1%,结果比较合理。因此平滑铝套XLPE绝缘高压电缆可以提高载流量。

Current carrying capacity is one of the important parameters of cable operation.In order to study the influence of different metal shielding forms of smooth aluminum sheath and corrugated aluminum sheath on the current carrying capacity of XLPE(cross linked polyethylene)insulated cables,220 kV/2500 mm2 ultra high voltage cables are selected As a test product,the theoretical calculation of the current carrying capacity of the smooth aluminum sheath and the corrugated aluminum sheath cable is carried out by thermal analysis,the finite element simulation calculation is carried out on the carrying capacity of the smooth aluminum sheath cable through the COMSOL software,and the smooth aluminum sheath and the wrinkle are calculated by the flow method.The aluminum sheathed cable undergoes a comparative verification test of current carrying capacity.Experimental verification shows that the current carrying capacity of the smooth aluminum sheath is increased by 5.6%than that of the corrugated aluminum sheathed shield structure.The current carrying capacity of the finite element simulation calculation is only 1%different from the verification result of the through flow method,and the result is relatively reasonable.Therefore,the smooth aluminum sheath XLPE insulated high voltage cable can increase the current carrying capacity.