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PRECURSORS OF BREAKDOWN IN SOLID INSULATORS

PRECURSORS OF BREAKDOWN IN SOLID INSULATORS,10.1109/PPC.1993.513328,B. T. McCuistian,E. R. Menzel,L. L. Hatfield

PRECURSORS OF BREAKDOWN IN SOLID INSULATORS   (Citations: 1)
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An experimental setup that is intended to produce precursors of b ulk breakdown in solid insulators is presented. The use of this apparatus to produce bulk breakdown and surface damage such as trees and tracks is given. The detection of this insulator damage is made possible by the use of laser induced fluorescence. The study of b ulk breakdown of insulators has provided several mechanisms which can lead to bulk breakdown[l]. The precursors of intrinsic breakdown have not been observed to the authors' knowledge. An experimental apparatus that should be able to produce precursors from point-plane geometry in a vacuum system has been constructed. The generation of these precursors should be possible if the applied v oltage is less than the voltage required to produce c omplete bulk breakdown. Laser Induced Fluorescence (LIF) has been shown to be a useful technique in studying insulator damage[2]. This t echnique has been adopted in the detection of bulk damage of insulators. 1 Sew The experimental setup used to produce the damaged insulators is shown in Figure 1. The eight-stage Marx bank erects to a capacitance of 675 pF. An inductance of 4 pH is used to provide a CLC ringup of the voltage due to the capacitance of the erected Marx and the combined capacitances of the high-voltage vacuum feedthrough bushing and the sample, which is approximately 70 pF. The voltage produced by a CLC ringup is unipolar and is gi.ven
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