Thermo-insulation characteristics of PPLP used for superconducting cable
作者单位：Shanghai Electrical Cable Research Institute School of Electrical Engineering Beijing Jiaotong University
会议名称：《第三届材料科学应用与能源材料国际研讨会》
会议日期：2020年
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
摘 要：High temperature superconducting（HTS） cable has attracted more attention for its high current density, low loss, and small size. The insulation structure design of HTS cable is very important for the safe operation. Many of the cold dielectric HTS cables use PPLP as the insulation material. However, the HTS conductor needs to endure temperature higher than 150℃ during the manufacturing process, and the effect of high temperature on the insulation characteristic of PPLP is unclear. The DSC curve of PPLP was analyzed, and the melting temperature of PPLP was 164.3℃. The oven was used to heat PPLP for 10 min, 20 min, 30 min, 1 h, 2 h. The heated PPLP was subjected to a power-frequency AC breakdown experiment. It was found that the AC breakdown voltage of PPLP is less than that of unheated PPLP, and its insulation performance degrades.