High Voltage Conduction & Breakdown Phenomena in Dielectrics

9220638 Zahn拟议的研究是对液体、气体和固体介质中高压绝缘、传导和击穿特性的继续研究。电力设备中使用的绝缘介质，如变压器、电缆等，以及脉冲功率技术中使用的马克思发生器和脉冲形成线，其性能都受到注入的空间电荷和绝缘表面电荷积累的影响。这种电荷扭曲了电场分布，并引入了电极之间的电荷迁移时间，作为一个附加的时间常数，超过了通常的介电松弛和流体传输时间。高压应力电极的电荷注入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。注入电荷的大小、极性和电击穿强度强烈依赖于电极材料组合和电压极性。这项研究试图利用现代光学、电子和计算机仪器来理解高场应力下气体、液体和固体介质的传导、老化、退化和击穿机制，使我们能够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持续监测液体和固体的电导率、介电常数、水分和体积电荷密度，这些测量也得到了改进，以便了解必要的参数值，以便在理论和实验之间进行比较。电荷输运理论也将被用来分析已发表的用电声法测量空间电荷分布的实验结果。*诉S t9220638扎恩拟议的研究是对高压绝缘的继续研究，导通和击穿特性S}n S$(F/S S/1信使符号&&A；Arial 5 Courier New X“h%%I R：\WW20USER\ABSTRACT.DOT Cassandra Queen Cassandra Queen

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