Potential Profile of Dielectrics during High-Voltage Pulse Application

Common industrial insulators (phenol impregnated press‐board, bakelite) are subjected to various voltage pulses with maximum applied fields up to 1 MV/cm. There is experimental evidence that when the applied pulse exceeds a threshold electric field (0.2 MV/cm for the examined materials) the potentia...

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Veröffentlicht in:Physica status solidi. A, Applied research Applied research, 1989-03, Vol.112 (1), p.123-130
Hauptverfasser: Dervos, C., Bourkas, P. D., Kayafas, E. A.
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Kayafas, E. A.
description Common industrial insulators (phenol impregnated press‐board, bakelite) are subjected to various voltage pulses with maximum applied fields up to 1 MV/cm. There is experimental evidence that when the applied pulse exceeds a threshold electric field (0.2 MV/cm for the examined materials) the potential profile across the dielectric develops discrete potential steps. This might be brought by instant high conductance of the material due to the presence of high mobility electrons. This is in agreement with the arguments for S‐type negative differential resistance (NDR) effects under high field application in organic dielectrics. An evaluation of the energy of electrons which are collected at the anode electrode is attempted. übliche industrielle Isolatoren (Phenol‐imprägniertes Hartpapier, Bakelite) werden mit verschiedencn Spannungsimpulsen mit maximalen Feldstärken bis zu 1 MV/cm beansprucht. Die experimentellen Untersuchungen zeigen, daß oberhalb eines Schwellenwerts des elektrischen Feldes (0,2 MV/cm für die untersuchten Materialien) in den Potentialprof ilen über den Dielektrika diskrete Potentialsprünge auftreten. Es wird angenommen, daß die Potentialsprünge durch eine Leitfähigkeitserhöhung des Materials infolge der Anwesenheit von Elektronen mit hoher Beweglichkeit hervorgerufen werden. Dies stimm mit der Erklärung für den S‐förmigen negativen differenticllen Widerstand (WDR) bei hohen Feldern in organischen Dielektrika überein. Es wird versucht, die Energie der an der Anode gesammelten Elektronen zu berechnen.
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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Electronic transport in condensed matter
Exact sciences and technology
High-field and nonlinear effects
Physics
title Potential Profile of Dielectrics during High-Voltage Pulse Application
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