Space charge behavior in low-density polyethylene at pre-breakdown

Matsui, Kohei; Tanaka, Yasuhiro; Takada, Tatsuo; Fukao, T.; Fukunaga, Kaori; Maéno, Takashi; Alison, J.M.

doi:10.1109/tdei.2005.1453444

Cited by 235 publications

(104 citation statements)

References 13 publications

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“…This is much smaller than is predicted from the Schottky-Mott rule of several eV for wide band gap insulators. A similar large charge injection rate is also observed in polyethylene (see Fig.6) 40 . These findings indicate that the localized states can extend very deep into the energy gap of the insulator with an unnegligible concentration so that the tunneling to these states is likely to dominate the injection process.…”

Section: A Charge Injectionsupporting

confidence: 77%

“…The negative field dependent transport velocity of the charge packet is not a unique feature for silicone but has also been found in other polymers like PE 40,53 and PMMA 54 . The mechanism however still remains unclear and cannot be readily explained by previously cited transport models since they all predict an exponential increase of mobility with field F or F 1/2 55 .…”

Section: F Fast Carriers and Negative Field Dependent Mobilitymentioning

confidence: 61%

“…This is consistent with the MH model that charge can move directly between different localized states by tunneling. The injected charges do not only dwell on the surface, but can also travel into the bulk and contribute to a continuous current flow, and this has been verified by PEA measurements 40 .…”

Section: B Charge Transfer At the Metal And Dielectric Interfacementioning

confidence: 61%

“…This abrupt mobility change was initially explained by the trap-filling effect proposed by Matsui et. al in PE 40 ( Fig.6): the deep traps are filled up in the region that is swept by the charge packet, so that newly injected charges hop mostly via shallow traps and can have a much larger mobility. But this explanation is not fully supported, because for effective trapping, the deep trap concentration should be at least comparable to the density of electrons in the packet, but no obvious electron accumulation in this region is ever seen 40,44 .…”

Section: Injected Charges Related Ageingmentioning

confidence: 99%

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On the nature of high field charge transport in reinforced silicone dielectrics: Experiment and simulation

Huang

Schadler

2016

Journal of Applied Physics

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The high field charge injection and transport properties in reinforced silicone dielectrics were investigated by measuring the time-dependent space charge distribution and the current under dc conditions up to the breakdown field, and were compared with properties of other dielectric polymers. It is argued that the energy and spatial distribution of localized electronic states are crucial to determining these properties for polymer dielectrics. Tunneling to localized states likely dominates the charge injection process. A transient transport regime arises due to the relaxation of charge carriers into deep traps at the energy band tails, and is successfully verified by a Monte Carlo simulation using the multiple-hopping model. The charge carrier mobility is found to be highly heterogeneous due to non-uniform trapping. The slow moving electron packet exhibits a negative field dependent drift velocity possibly due to the spatial disorder of traps.

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Section: A Charge Injectionsupporting

confidence: 77%

Section: F Fast Carriers and Negative Field Dependent Mobilitymentioning

confidence: 61%

Section: B Charge Transfer At the Metal And Dielectric Interfacementioning

confidence: 61%

Section: Injected Charges Related Ageingmentioning

confidence: 99%

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On the nature of high field charge transport in reinforced silicone dielectrics: Experiment and simulation

Huang

Schadler

2016

Journal of Applied Physics

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“…This phenomenon was reported further at higher electric fields in the range of 100-400 kV/mm, which is close to the breakdown strength of LDPE. (53) Nowadays, the PEA method has been recognized as one of the most advanced methods for measuring the distribution of space charge in extruded cables.…”

Section: Applications To Electrical Cablesmentioning

confidence: 99%

Space Charge Measurement Technologies and Their Potential Applications

2017

Sensors and Materials

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The development history of major space-charge measurement technologies is reviewed. Advantages and disadvantages are analyzed regarding the electron beam, thermal pulse, pressure wave, pulsed electroacoustic wave, electrooptic Kerr effect, and Pockels effect methods. Measurement technologies are discussed further with regard to principles, knowhow, and milestones of development. With the pulsed electroacoustic method as an example, a deconvolution technique is introduced, as it is needed to quantify the density of space charge in a material. Potential applications of these technologies to measure the distribution of space charge in dielectrics and electrical insulation materials and systems are addressed. By the electrooptic Pockels effect method, two-dimensional discharge patterns on the surfaces of cellulose Kraft paper and Nomex T410 paper were measured and reported for the first time. With the progress of the technologies, it appears that today, sensors can be made to measure quantitatively the distribution of space charge in dielectrics and electrical insulation systems.

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Introduction

2024

Polypropylene Cable Insulation

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Space charge behavior in low-density polyethylene at pre-breakdown

Cited by 235 publications

References 13 publications

On the nature of high field charge transport in reinforced silicone dielectrics: Experiment and simulation

On the nature of high field charge transport in reinforced silicone dielectrics: Experiment and simulation

Space Charge Measurement Technologies and Their Potential Applications

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