Research on the Current Carrying Capacity of an HTS Power Cable Used in Energy Pipeline

With the development of long-distance large-capacity DC power transmission technology, and the advantage of the integrated energy pipeline simultaneously transmits electric energy and LNG, high-temperature superconducting(HTS) cable plays an important role in energy pipeline carrier because of its advantages of zero resistance, high efficiency transmission and cooling capacity sharing. HTS cables work in liquid nitrogen, and HTS cables can realize the cold energy sharing of transmission fuel and electricity. Therefore, it is necessary to analyze the current carrying capacity of HTS cable based on the research of energy pipeline. In this paper, two different structures of HTS cable, coaxial bipolar and single core bipolar cable core, are analyzed by electromagnetic simulation. According to the anisotropy of each superconducting material, the influence of magnetic field on the critical current of different structures is analyzed. In order to verify the accuracy of this design, a HTS DC cable with rated current of 1000A at 90K is completed, and the relevant data parameters are given. Finally, a series of current carrying capacity tests were carried out on the HTS DC current sample, including the critical current test under different temperature, the temperature rise of the inner and outer layers of the cable core. The test results and current carrying capacity were analyzed.