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Development of Design Method of Electrical Insulation and Improvement Method of withstand Strength in HTC Superconducting Power Apparatus

HTC超导电力装置电绝缘设计方法及耐压强度改进方法的开发

基本信息

批准号：
10305021
负责人：
HARA Msanori
金额：
$ 17.34万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
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

项目摘要

Recent advancements in High Tc Superconducting (HTS) wire technology have stimulated increasing interest in the past few years in the development of high Tc superconducting power apparatus. To ensure the feasibility of the introduction of HTS power apparatus into present electric power systems, the reliability of the electrical insulation must be incorporated in the design from the early beginning of the development of the apparatus. The aim of the present study is essentially to establish the electrical insulation policy of HTS power apparatus taking into account of the quenching phenomena which will not only cause bubble formation in insulation medium but also create a high voltage drop across the coil layer. For this purposes, this research project was divided into three parts : (1) Studies on electrical breakdown mechansm and characteristics with modeled bare coil electrodes, (2) Studies on bubble behavior under quenching condition with a modeled HTS coil and (3) Void discharge studies.The results suggests the following about the electrical insulation policy. Since the vapor locking can appear in the cooling channel of HTS superconducting coil at quenching state, the required insulation space should be determined as the insulation medium being nitrogen gas at temperature of quenched conductor if the quenching is unavoidable and high reliable electrical insulation is required. Instulation material under cryogenic conditions has better long time V-t characteristics than under operating temperatures of conventional electric power apparatus. However, partial discharge in voids included in solid insulator under voltage stresses with harmonics, should be considered to be one of the important degradation factors of insulation material. Moreover, the temperature change at any portion in solid insulator should be suppressed lower than 5K/min. to avoid the formation of crazy crack by the heat stress.

近年来，高温超导线材技术的发展引起了人们对高温超导电力设备发展的极大兴趣。为了确保高温超导电力设备引入现有电力系统的可行性，必须从设备开发的早期开始就将电绝缘的可靠性纳入设计中。本研究的目的主要是建立考虑到淬火现象，这不仅会导致气泡形成绝缘介质中，但也会产生一个高的电压降线圈层的高温超导电力设备的电气绝缘政策。为此，本研究分为三个部分：（1）裸线圈电极模型的电击穿机理和特性研究，（2）高温超导线圈模型的猝灭条件下气泡行为研究和（3）空穴放电研究。由于高温超导线圈在失超状态下冷却通道内会出现气锁现象，如果失超不可避免且要求高可靠的电绝缘，则应确定所需的绝缘空间为失超导体温度下的绝缘介质为氮气。低温条件下的装置材料比常规电力设备在工作温度下具有更好的长时间V-t特性。然而，在谐波电压应力作用下，固体绝缘子内部空隙中的局部放电是导致绝缘材料劣化的重要因素之一。此外，固体绝缘体中任何部分的温度变化应被抑制在5 K/min以下，以避免热应力导致的疯狂裂纹的形成。