Abstract The rising share of renewable energy in the European grid creates a demand for long-length, high-power transmission lines. Superconducting cables represent an attractive option for such connections, offering considerable savings in energy and space for installation. Due to its low cost, the MgB2 superconductor might be an interesting choice, but it requires to be operated at very low temperature. In this paper, a simple thermo-hydraulic model is developed, which allows for a fast assessment of the main dimensions of a four-wall cryogenic envelope around a high-power MgB2 cable as well as the achievable distance between two cooling stations. This model is then expanded to provide the budgetary cost of such a link including the components of the cryostat and the necessary cooling stations. A significant cost reduction as compared to a resistive link can be found for a transmitted power of 6.4 gigawatts. Different optimizations are investigated, which result in further savings.

中文翻译：

---

长长高功率 MgB2 超导电缆的热液压和经济方面

摘要 欧洲电网中可再生能源的份额不断增加，对长距离、大功率输电线路产生了需求。超导电缆是此类连接的一个有吸引力的选择，可显着节省能源和安装空间。由于其低成本，MgB2 超导体可能是一个有趣的选择，但它需要在非常低的温度下运行。在本文中，开发了一个简单的热工水力模型，可以快速评估围绕高功率 MgB2 电缆的四壁低温外壳的主要尺寸以及两个冷却站之间的可实现距离。然后扩展该模型以提供这种链路的预算成本，包括低温恒温器的组件和必要的冷却站。对于 6.4 吉瓦的传输功率，可以发现与电阻链路相比，成本显着降低。研究了不同的优化，从而进一步节省成本。