Study on transient stability of superconducting cables

19941. 模拟多股超导电缆瞬态稳定性的数值模拟：我们开发了一些计算机代码来模拟多股电缆的瞬态行为，如导线间的电流分布和电缆内的温度分布。我们还开发了一种利用拾取线圈系统估计股线之间电流分布的方法。导线间交叉接触电阻的灵敏测量方法：提出了一种采用超导变压器的新方法。通过这种方法，我们可以测量大约10^<-8> ω .19951的小交叉接触电阻。多股超导电缆向正常状态过渡的模拟：我们进行了大量的实验，以评估所开发的计算机代码的有效性，并研究了多股电缆在淬火过程中的瞬态行为。从这些数值模拟和实验结果可以看出，超导链的材料特性和冷却剂的热效应对瞬态稳定性的影响是明显的。卢瑟福型电缆交叉接触电阻的测量：采用本文提出的方法对SSC工程中卢瑟福型电缆的交叉接触电阻进行了测量。多股超导电缆向正常状态过渡的模拟：通过三维有限元分析，我们开发了一种计算机代码，研究了多股超导电缆横截面的温度演变，并阐明了铜基体对电缆瞬态稳定性的影响。根据本项目的研究结果，为交流用高稳定超导电缆的设计和研制提供了指导。卢瑟福电缆交叉接触电阻的测量：研究了养护温度和养护压力对卢瑟福电缆交叉接触电阻的影响。

19941. Numerical cord for simulation of transient stability of multi-strand superconducting cables : We developed some computer codes to simulate transient behaviors of multi-strant cables such as current distribution among srands and temperature distribution in cables. We also developed a method for estimation of the current distribution among strands by using a pick-up coil system.2. Sensitive method for measurement of electrical cross contact resistance between strands : We proposed a new method adopting superconducting transformer. By this method, we could measure small cross contact resistance of about 10^<-8> OMEGA.19951. Simulation of transition to normal state in multi-strand superconducting cables : We carried out a lot of experiments to evaluate the validity of the developod computer codes and to investigate the transient behavior of multi-strand cables in quench process. From these numerical simulations and experimental results, the influences of the material properties of superconduciting strand and the thermal effect of coolant on the transient stability became evident.2. Measurement of cross contact resistance of Rutherford type cables : We adopted the proposed method to measure the cross contact resistance of Rutherford cables for SSC project.19961. Simulation of transition to normal state in multi-strand superconducting cables : We newly developed a computer code by 3D finite element analysis to investigate the temperature evolution in cross-section of a strand and to clarify the effect of copper matrix on the transient stability. From these results obtained for the term of this project, the guideline for the design and development of highly stabilized superconducting cables for AC use.2. Measurement of cross contact resistance of Rutherford type cables : We investigated the influences of curing temperature and pressure on the cross contact resistance of Ratherford cables.