标题:
220 kV/3 kA冷绝缘高温超导电缆的轴向温度分布Longitudinal Temperature Distribution for 220 kV/3 kA CD HTS Cable
作者:
郑志强, 王银顺, 李肖, 程远, 代常会, 薛驰, 赵连岐
关键字:
高温超导电缆, 冷绝缘, 泵浦损耗, 换热特性, 温度分布High Temperature Superconducting (HTS) Cable; Cold Dielectric (CD); Pumping Loss; Heat Transfer Characteristics; Temperature Distribution
期刊名称:
《Transmission and Distribution Engineering and Technology》, Vol.1 No.2, 2012-12-18
摘要:
对远距离输电高温超导电缆而言，液氮在电缆导体骨架与低温容器内如采用反向循环流动制冷方式会导致电缆两端温差过大，因此高温超导电缆应采用液氮同向流动的制冷方式。由于波纹管具有优良的机械强度与热补偿特性，使其在高温超导电缆中得到了广泛应用，它可以形成冷却超导体用的制冷液氮的流通通道。在高温超导电缆设计之前，有必要对液氮在波纹管中的流动特性进行研究。文章对波纹管通道内液氮流动的摩擦系数随雷诺数的变化规律进行了研究分析，得到了220 kV/3 kA高温超导电缆液氮流动产生的泵浦损耗值。在得到了高温超导电缆的各项损耗值之后，对高温超导电缆的温度分布进行了研究，并得到高温超导电缆温度分布方程以及温度分布规律曲线图。
For long distance transmission HTS cables, co-flow cooling of LN2 should be adopted, since that counter- flow cooling of LN2 incable former and cryostat may lead to large temperature difference between cable terminals. Due to their extraordinary property of mechanical strength and thermal compensation, corrugated pipes can be widely used in flowing channels of cooling liquid nitrogen (LN2), the coolant of superconductors. Hydraulic characteristics of LN2 incorrugated pipes are needed to be studied in design of high temperature superconducting (HTS) cable. Variation law of friction factors with Reynolds number for LN2 flow in corrugated pipes is systematically studied, and therefore value of pumping loss, which is caused by LN2 flowing in the corrugated pipe channels, for 220 kV/3 kA HTS cables can be obtained. Based on all items of losses of HTS cable calculated, equations and curve of temperature distribution for HTS cable can be finally obtained.