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Development of High Performance Extruded Polymer Insulated DC Superconducting Model Cable using High Temperature Superconductor

利用高温超导体开发高性能挤压聚合物绝缘直流超导模型电缆

基本信息

批准号：
10555091
负责人：
KOSAKI Masamitsu
金额：
$ 8.19万
依托单位：
GIFU NATIONAL COLLEGE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The investigators have been developing extruded ethylene-propylene rubber (EPR) insulated superconducting power cables. The model cable developed in this study had very simple structure : the silver sheathed bismuth type high temperature superconducting wires laid in parallel on a stabilizing core brass pipe is electrically insulated by wrapped EPR together with semiconducting shielding layers. The optimization of the layout of the superconducting wires on the core pipe gave their satisfactory contact with EPR insulation after repeated thermal cycles between room temperature (RT) and liquid nitrogen temperature (77K). This reveals that the radial, circumferential and length-wise thermal contractions of EPR at cooling do not affect the current characteristics of the superconducting wires. Hence the EPR insulation can be applied to the high temperature superconductors who are generally considered to be vulnerable to the mechanical stress. The dc critical current and quench current measurements also showed that they are only slightly affected by the mechanical stresses of the wrapped EPR insulation. The epoch-making fact is that DC superconducting cables can wipe out all the losses and drawbacks associated with AC version : hysteresis loss, eddy current loss, dielectric loss of insulation and partial discharges. Therefore the results obtained in this study open an avenue to the DC high temperature superconducting cables which can possibly play dominating roles in the future underground power transmission.

研究人员一直在开发挤压乙丙橡胶（EPR）绝缘的超导电力电缆。本研究所研制的模型电缆结构非常简单：银护套铋系高温超导导线平行敷设在稳定芯黄铜管上，并由EPR和半导体屏蔽层包裹在一起实现电绝缘。在室温（RT）和液氮温度（77K）之间反复热循环后，芯管上超导导线的布局的优化使它们与EPR绝缘体具有满意的接触。这表明EPR在冷却时的径向、周向和纵向热收缩不影响超导线材的电流特性。因此，EPR绝缘可以应用于通常被认为易受机械应力影响的高温超导体。直流临界电流和失超电流的测量结果也表明，它们只受到轻微的机械应力的包裹EPR绝缘。划时代的事实是，直流超导电缆可以消除与交流版本相关的所有损耗和缺点：磁滞损耗，涡流损耗，绝缘介质损耗和局部放电。因此，本研究的结果为未来可能在地下输电中发挥主导作用的直流高温超导电缆开辟了一条途径。