RESEARCH AND DEVELOPMENT OF SUPERCONDUCTORS WITH LARGE CURRENT CAPACITY FOR SUPERCONDUCTING TRANSFORMERS INSTALLED IN UNDERGROUND SUBSTATIONS

地下变电站超导变压器大通流容量超导材料的研发

• 批准号: 10555092
• 负责人: FUNAKI Kazuo
• 金额: $ 8.13万
• 依托单位: KYUSHU UNIVERSITY
• 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 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555092/
• 关键词: oxide superconductor; superconducting transformer; transposed parallel conductor; AC loss; liquid nitrogen; dielectric strength; 高温超伝導体; 地下変電所; Bi2223; 過冷却液体窒素

We first analyzed the test results of a 500kVA liquid-nitrogen cooled oxide superconducting transformer, which we previously designed and built, and then extracted the research subjects necessary for the development of superconducting transformers with larger capacity. According to the results, we made the following basic research with the aim of the realization of oxide superconducting transformer windings with large current capacity and high voltage withstand level ; (1)investigation of electromagnetic properties of silver-sheathed Bi-system superconducting wires, (2)study on the optimum configuration of transposed parallel conductors with large current capacity, which are composed of oxide superconducting strands, (3)study on the stability of superconducting parallel conductors at liquid-nitrogen temperature, (4)evaluation of the condition of the bubble formation in saturated and sub-cooled liquid nitrogen in the case where superconducting windings are changed into normal state, (5) … More study on the insulation strength of subcooled liquid nitrogen and the applicable insulation structure, and (6)design and test of oxide superconducting model coils which simulate the actual condition of superconducting transformer windings in the electric power system. Furthermore we studied the practical use of oxide superconducting transformers in the electric power grid. On the basis on the obtained results, we entirely supported the development project of a 1000kVA-22kV/6.9kV oxide superconducting transformer cooled by liquid nitrogen and produced it successfully. We performed the field-test of the superconducting transformer first in Japan. In the test, we observed and evaluated the electromagnetic properties of superconducting parallel conductors, and the insulation strength and cooling properties of sub-cooled liquid nitrogen in the case that the superconducting transformer windings was exposed to the actual condition in electric power grid. Therefore we verified the obtained results in this study. Less

本文首先分析了我们设计制造的500 kVA液氮冷却氧化物超导Transformer的试验结果，然后提炼出研制更大容量超导变压器所需的研究课题。根据研究结果，我们以实现氧化物超导Transformer绕组的大电流容量和高耐压水平为目标，进行了以下基础研究：（1）银包铋系超导线材的电磁性能研究;（2）氧化物超导绞线组成的大容量换位并联导体的最佳结构研究;（3）超导并联导体在液氮温度下的稳定性研究;（4）超导绕组转变为正常状态时，在饱和过冷液氮中气泡形成条件的评价;（5）超导绕组在液氮温度下的稳定性研究 ...更多信息 研究过冷液氮的绝缘强度和适用的绝缘结构;（6）模拟电力系统中超导Transformer绕组实际情况的氧化物超导模型线圈的设计与试验。此外，我们还研究了氧化物超导变压器在电网中的实际应用。在此基础上，我们完全支持了液氮冷却的1000 kVA-22 kV/6.9kV氧化物超导Transformer的研制项目，并成功生产。我们在日本首先进行了超导Transformer的现场试验。在试验中，我们观察和评估了超导并联导体的电磁性能，以及超导Transformer绕组暴露在电网实际条件下的过冷液氮的绝缘强度和冷却性能。因此，我们在本研究中验证了所获得的结果。少

项目成果

K.Funaki,et al.: "Recent Application of Bi-2223 Tapes to Transformer Windings and Pulsed Coils"Advances in Superconductivity XII. (掲載予定).

K.Funaki 等人：“Bi-2223 胶带在变压器绕组和脉冲线圈中的最新应用”超导进展 XII（即将出版）。

K.Funaki,et al.: "Over-current test of a Bi-2223 model winding for a high-voltage-typeHTS transformer"Proc.of EUCAS'99. (掲載予定).

K.Funaki 等人：“高压型 HTS 变压器的 Bi-2223 模型绕组的过电流测试”Proc.of EUCAS99（即将出版）。

K.Funaki et al.: "Over-current test of a Bi-2223 model winding for a high-voltage-type HTS transformer"Inst.Phys.Conf.Ser.. Vol.167,No.1. 1115-1118 (2000)

K.Funaki 等人：“高压型 HTS 变压器的 Bi-2223 模型绕组的过电流测试”Inst.Phys.Conf.Ser.. Vol.167，No.1。

M.G.Danikas,S.Tsuru,M.Nakamura,T.Mine,J.Suehiro and M.Hara: "PD Characteristics and Mechanisms in Artificial Air-Filled Voids at Room and Liquid Nitrogen Temperatures"IEEE Trans.Dielectrics and Electrical Insulation. Vol.7,No.6. 875-876 (2000)

M.G.Danikas、S.Tsuru、M.Nakamura、T.Mine、J.Suehiro 和 M.Hara：“室温和液氮温度下人工空气填充空隙中的局放特性和机制”IEEE Trans.Dielectrics 和电气绝缘。

M.Iwakuma,et al.: "Development of a 1T Cryocooler-Cooled Pulse Coil with a Bi2223 Superconducting Parallel Conductor for SMES" IEEE Trans.Appl.Supercond.(掲載予定).

M. Iwakuma 等人：“用于 SMES 的具有 Bi2223 超导并联导体的 1T 低温冷却器冷却脉冲线圈的开发”IEEE Trans.Appl.Supercond。