High Voltage Conduction & Breakdown Phenomena in Dielectrics

高压传导

• 批准号: 9220638
• 负责人: Markus Zahn
• 金额: $ 28.29万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-15 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9220638&HistoricalAwards=false
• 关键词: Voltage; Conduction; & Breakdown; Phenomena

9220638 Zahn The proposed research is the continued study of high voltage insulation, conduction and breakdown characteristics in liquid, gaseous and solid dielectrics. Insulating dielectrics used in power apparatus, such as transformers and cables, and in the pulse power technology, such as Marx generators and pulse forming lines, have their performance affected by injected space charge and by surface charge accumulation on insulating surfaces. This charge distorts the electric field distribution and introduces the charge migration time between electrodes as an additional time constant over the usual dielectric relaxation and fluid transport times. Charge injection from high voltage stressed electrodes are measured by Kerr electro-optic field and charge mapping measurements, voltage-current terminal measurements, and electrical breakdown tests. The magnitude and polarity of injected charge and the electrical breakdown strength deped strongly on electrode material combinations and voltage polarity. The research tries to understand conduction, aging, degradation, and breakdown mechanisms in high field stressed gaseous, liquid, and solid dielectris using new modern optical, electronic, and computer instrumentation to give us eyes to see charge transport effects inside materials that could not be seen before. These measurements are improved by also using newly developed sensors to continuously monitor liquid and solid conductivity, permittivity, moisture, and volume charge densities so that necessary parameter values are known to allow comparison between theory and experiment. Charge transport theory will also be used to analyze published experimental results of others of space charge distributions measured with electro-acousitc methods. *** v s t 9220638 Zahn The proposed research is the continued study of high voltage insulation, conduction and breakdown characteristics s } n s $ $ $ ( F / s s / 1 Courier Symbol & Arial 5 Courier New X X " h % % I R:\WW20USER\ABSTRACT.DOT Cassandra Queen Cassandra Queen

9220638 Zahn拟议的研究是继续研究液体，气体和固体介质中的高压绝缘，传导和击穿特性。 在电力设备（如变压器和电缆）和脉冲功率技术（如马克思发生器和脉冲形成线）中使用的绝缘套管的性能受到注入的空间电荷和绝缘表面上的表面电荷积累的影响。 该电荷使电场分布失真，并在通常的介电弛豫和流体传输时间上引入电极之间的电荷迁移时间作为附加的时间常数。 通过克尔电光场和电荷映射测量、电压-电流端子测量和电击穿测试来测量来自高压应力电极的电荷注入。 注入电荷的大小和极性以及击穿强度与电极材料组合和电压极性密切相关。 该研究试图了解高场应力气体，液体和固体电介质中的传导，老化，降解和击穿机制，使用新的现代光学，电子和计算机仪器，让我们看到以前看不到的材料内部的电荷传输效应。通过使用新开发的传感器来连续监测液体和固体电导率、介电常数、湿度和体积电荷密度，从而已知必要的参数值以允许理论与实验之间的比较，从而改进了这些测量。 电荷输运理论也将用于分析已发表的电声法测量空间电荷分布的实验结果。 *** v S t 9220638 Zahn拟议的研究是对高压绝缘、传导和击穿特性的继续研究 S } n S $ $ $ ( F / S S / 1件 Symbol Arial 5 Cash New X X " H % % 我 R:\WW20USER\ABSTRACT.DOT 卡桑德拉女王卡桑德拉女王