高温超导电缆的稳定性能关系到整个超导输电系统的安全运行，是推进超导输电实用化进程的关键技术之一。本项目着眼于高温超导电缆在故障电流和低温系统故障运行条件下的稳定特性，以采用YBCO涂层导体的冷绝缘高温超导电缆多股并绕分层导体为基本支路单元，在对超导电缆稳定性影响因素及其相互关系充分研究的基础上，应用集总参数等效法建立高温超导电缆磁热稳定性分析数学模型。通过对超导电缆各个导电层在不同运行条件下的分流、热负荷暂态响应特性进行全面的理论和试验研究，从而获得超导电缆载流、失超和热负荷特征变化规律，为高温超导电缆稳定运行裕度设计和稳定化技术提供理论依据。本项目是将超导体磁热稳定性应用于超导电缆稳定裕度设计理论中的创新,通过稳定裕度判据能够提前发现并排除超导电缆输电中异常故障影响，提高超导电缆运行的可靠性，对推动高温超导电缆输电实用化具有重要的意义和作用。

The stability of high temperature superconducting (HTS) AC cable is very important for the safe operation of the superconducting power transmission system and it is also one of the key technologies for advancing the process of the practical use of HTS cable in power system. This research focuses on the stability characteristics of the HTS cable in the operating conditions of the fault current and cryogenic system failure. Considering HTS cable conductor layers as the basic branch units, a magnetic-thermo coupled stability mathematical model is first set up using the lumped parameter method to study the stable performance of a cold dielectric HTS cable with multi-strand around the layers of YBCO coated conductor. A comprehensive theoretical and experimental research of the current shunting, AC loss and temperature variation for the HTS cable in different operating condition is achieved by using this stability analysis model. The transient characteristics of current carrying, quench and heat load transfer in HTS cable are given and they can provide a theoretical basis for the security and stability margin design and for the stabilization technology of HTS cable. As a result, the abnormal activity of HTS cable can be found and eliminated in advance according to this safety margin. This research applied the magnetic-thermo coupled theory has proposed a novel stability analysis method which is helpful and meaningful to improve the operation reliability and promote the application of HTS cable in power transmission system.