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Study on Creeping Partial Discharge and its Influence for Inorganic Insulating Materials at High Temperatures

无机绝缘材料高温沿面局部放电及其影响研究

基本信息

批准号：
12650264
负责人：
ISHIDA Masayoshi
金额：
$ 2.24万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650264/
关键词：
High Temperature Inorganic Insulating Material Partial Discharge Creeping Surface φ-q-n distribution High Voltage Direct Current Dielectric Constant 低損失パワーデバイスコンデンサ電極三次元統計処理

项目摘要

Various fundamental studies on partial discharge of inorganic insulating materials at high temperatures, performance improvement investigation of an electric motor applied with heat-resist insulation, dielectric properties of direct current high voltage, and dielectric constant characteristics for condenser materials have been carried out. The schematic results are summarized below.(1) Partial discharge generation phenomena have been measured with several kinds of ceramics. Discharge quantity increases with temperature rise but saturates above a threshold value because of local enhancement of conductance. It has been hinted that the threshold temperature rises as a function of thermal conductivity of specimen.(2) Increase effect of power density on heat-resist motor has been evaluated by computer simulation. It has been clarified that the power density improves up to 400℃ but significant effect cannot be obtained higher than it.(3) Insulating properties of disc shape alumina ceramics have been measured with applying DC voltage in nitrogen atmosphere up to over 500℃. The partial discharge inception voltage decreases with temperature rise and saturates at temperatures higher than 500℃.(4) The dielectric constant of BaTiO_3 ceramics follows the Curie-Weiss theory from 150℃ to 300℃ However, the characteristics changes like a resistance. It has been considered that the reason is due to a reduction of the apparent resistance value with leak current enhancement including partial discharge.

对无机绝缘材料的高温局部放电、耐热绝缘电机的性能改进、高压直流介电特性、电容器材料的介电常数特性等方面进行了大量的基础研究。实验结果总结如下：(1)测量了几种陶瓷材料的局部放电现象。放电量随温度升高而增加，但由于局部电导增强，在阈值以上达到饱和。结果表明，阈值温度随试件导热系数的增加而升高。(2)通过计算机模拟评价了功率密度对耐热电机的提高效果。结果表明，在氮气气氛中施加直流电压，可使陶瓷的功率密度提高到400℃以上，但不能达到更高的效果。(3)在氮气气氛中施加直流电压，测量了盘状氧化铝陶瓷的绝缘性能。局部放电起始电压随温度升高而降低，在高于500℃时达到饱和。(4)在150~300℃范围内，BaTiO_3陶瓷的介电常数遵循居里-魏斯理论，但其介电常数的变化呈电阻变化。其原因被认为是由于漏电流增大导致表观阻值降低，包括局部放电。