Triaxial HTS AC power cables, that incorporates three HTS phases wound around a single core within a single cable is considering the optimal solution for low and medium voltages. Such a design permits to save expensive HTS conductor and to increase the power density transmitted. It is difficult to increase the transmission capacity of a triaxial cable by increasing its operating voltage and therefore, insulation thickness between phases. The other way is to increase the operation current by using a multilayer structure in each phase of the triaxial cable. This task demands a complicated optimization analysis and a precise manufacturing technology. Following our previous studies, we developed and tested the triaxial cable prototype with two layers per phase made of ReBCO wire. The optimal parameters of the cable (twist pitch, diameters of phases, etc.) have been determined using the numerical simulation methods developed. DC and AC tests of the cable has been performed. In the result, the feasibility to provide a uniform current distribution in a triaxial cable, each phase of which consists of two layers, has been demonstrated. With the outer diameter of ∼24 mm only, this is the most compact triaxial HTS power cable manufactured and tested up to date with currents up to 4 kA per phase. The anticipated power transfer with three phases of this cable can be as large as ∼34 MW.

中文翻译：

---

大电流三轴2G HTS电力电缆的优化和冷试验

三轴HTS AC电力电缆将三个HTS相缠绕在一根电缆的单芯上，正在考虑针对中低压的最佳解决方案。这种设计可以节省昂贵的HTS导体并增加传输的功率密度。通过增加三轴电缆的工作电压并因此增加相之间的绝缘厚度来增加其传输容量是困难的。另一种方法是通过在三轴电缆的每个相中使用多层结构来增加工作电流。此任务需要复杂的优化分析和精确的制造技术。根据之前的研究，我们开发并测试了三相电缆原型，每相由ReBCO线制成两层。电缆的最佳参数（扭距，相直径，等）已使用开发的数值模拟方法确定。电缆的直流和交流测试已执行。结果，证明了在三轴电缆中提供均匀电流分布的可行性，该三轴电缆的每一相都由​​两层组成。仅外径约为24 mm，这是迄今为止最紧凑的三轴HTS电力电缆，其生产和测试经过测试，每相电流高达4 kA。该电缆三相的预期功率传输可能高达〜34 MW。仅外径约为24 mm，这是迄今为止最紧凑的三轴HTS电力电缆，其生产和测试经过测试，每相电流高达4 kA。该电缆三相的预期功率传输可能高达〜34 MW。仅外径约为24 mm，这是迄今为止最紧凑的三轴HTS电力电缆，其生产和测试经过测试，每相电流高达4 kA。该电缆三相的预期功率传输可能高达〜34 MW。