冷绝缘高温超导电缆绝缘设计的研究(英文)

Research on the insulation design of the cold dielectric high temperature superconducting cable

目前随着国内外高压输电系统的不断发展,许多研究机构一直试图开发高电压等级的高温超导电缆系统,这就要求设计的HTS电缆要有可靠的绝缘性能和优化的绝缘设计技术。根据超导电缆的结构特点和高温超导电缆系统的运行特点,对Nomex和PPLP进行了交流耐压、雷电冲击、局部放电(PD)起始电压和热循环等高压绝缘特性试验。根据不同厚度和不同层数的Nomex和PPLP在上述特性试验下的威布尔(Weibull)分布,得出了相应厚度和层数下的No-mex和PPLP的绝缘特性参数。提出了一种改进的冷绝缘高温超导电缆绝缘设计方法,并对此方法下设计的35kV微型电缆绝缘模型进行了相关高压绝缘试验,验证了此种绝缘设计方法的可行性。根据提出的绝缘设计方法得出了220 kV冷绝缘高温超导电缆的绝缘厚度,并将在已有试验的基础上继续完善绝缘设计方法,最终设计出220 kV电压等级的绝缘测试模型。

As the continuous development of transmission system requires for higher voltage level, many research institutes have been trying to develop high voltage High Temperature Superconducting （HTS） cable system, which require reliable insulation characteristics and optimum insulation design skills. According to the structural characteristics of superconducting cables and the operating characteristics of the HTS system, this paper presents Nomex and PPLP＇s performance on AC breakdown, lightning impulse breakdown, partial discharge （PD） inception characteristics and thermal cycling performance of corresponding maximum electric design stress is estimated according to the Weibull distribution of Nomex and PPLP in different conditions. After the design and test of a 35kV mini -cable which is used to prove the feasibility of the insulation design, a modified Cold Dielectric （CD） HTS power cable insulation design methodology for HV is proposed. Consequently, a 220 kV level prototype cable model which uses stainless steel instead of HTS cable for the insulation test will be ultimately manufactured.