Fast soliton-like charge pulses in insulating polymers

Dissado, L.A.; Montanari, Gian Carlo; Fabiani, Davide

doi:10.1063/1.3554694

Cited by 31 publications

(42 citation statements)

References 44 publications

(57 reference statements)

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“…a charge soliton [7][8][9]13]. It has been speculated, based on observations performed on crosslinked polyethylene, XLPE, that positive pulses move across the insulation bulk as positive 'holes' and for a positive charge pulse (g-i) and a negative charge pulse (j-l) at 45°C (the relative time for pulse transport is also indicated in each figure).…”

Section: Charge Patterns and Ultra-fast Charge Pulsesmentioning

confidence: 99%

“…The injection and transport of soliton-like charge pulses in a polymer has been explained by considering the effect of the electromechanical compression at the electrodeinsulation interface [6][7][8][9]13]. Figure 6 shows a sketch summarizing such a charge injection and transport mechanism.…”

Section: Charge Patterns and Ultra-fast Charge Pulsesmentioning

confidence: 99%

“…It has been speculated, based on observations performed on crosslinked polyethylene, XLPE, that positive pulses move across the insulation bulk as positive 'holes' and for a positive charge pulse (g-i) and a negative charge pulse (j-l) at 45°C (the relative time for pulse transport is also indicated in each figure). In the figures the time at the beginning of each sequence is denoted as t = 0, and subsequent times on the figures are measured from the start of the sequence by reverse tunneling of electrons from one chain to another when they are close enough and negative pulses move as electrons into free volume opened by chain movements [8,13]. Hence, the transport of charges pulses of both polarities relies on the relaxation of polymer chains, but this may occur by different paths and involving different parts of the polymer structure.…”

Section: Charge Patterns and Ultra-fast Charge Pulsesmentioning

confidence: 99%

“…The introduction of nanofillers into a polymer provides a method to modify the mechanical, magnetic, electric and optical properties of the polymer itself [10][11][12]. Therefore, if the characteristics of the fast pulses change together with the mechanical relaxation of a nanostructured polymeric material, showing a correlation with the presence and concentration of nanoparticles, which would be strong support for the former explanation regarding the conduction mechanism associated with fast pulses [8,9,13].…”

Section: Introductionmentioning

confidence: 96%

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The effect of mechanical relaxation on ultra-fast charge pulses in flexible epoxy resin nanocomposites

Montanari

Fabiani

et al. 2012

Appl. Phys. A

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Previously we have reported the existence of small-amplitude charge pulses in crosslinked Polyethylene (XLPE) and epoxy resin with a mobility several orders of magnitude higher than that found for the incoherent charge transport relevant to the steady state current. Here the relationship of this phenomenon to mechanical relaxation in the material is investigated by using a series of epoxy resin nanocomposites based on a resin that has its flexibility increased above that of the fully cured glassy epoxy network by the addition of a suitable flexibilizing chemical. Differential Scanning Calorimetry (DSC) measurements show that the stiffness of the nanocomposite is progressively increased as the nanoparticle concentration increases. Pulsed Electro-Acoustic (PEA) measurements reveal that both positive and negative fast charge pulses exist in the unfilled epoxy at 45 and 70°C under a field of 10 kV/mm with mobility 5 × 10 −10 to 9 × 10 −10 m 2 V −1 s −1 , amplitude between 2 × 10 −5 and 3.6 × 10 −5 C m −2 and repetition rates between 8 and 12 s −1 . These values are reduced progressively as the nanoparticle concentration is increased from 0% in the unfilled epoxy. A β-mode mechanical relaxation is identified in the loss modulus by Dynamical Mechanical Analysis (DMA), whose activation energy moves to higher values with increasing nanoparticle concentration. It is shown that the repetition rates of both positive and negative pulses have similar values and are correlated with the β-mode activation energy; a similar correlation is found for the activation energy of the mobility of positive pulses. The correlation of the activation energy of the mobility of negative pulses and that of the β-mode is weaker although both show a progressive increase with nanoparticle concentration. The modification of the fast charge pulse properties by the mechanical stiffness of the epoxy nanocomposite is discussed in terms of the theory presented previously for their formation and transport.

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Section: Charge Patterns and Ultra-fast Charge Pulsesmentioning

confidence: 99%

Section: Charge Patterns and Ultra-fast Charge Pulsesmentioning

confidence: 99%

Section: Charge Patterns and Ultra-fast Charge Pulsesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

The effect of mechanical relaxation on ultra-fast charge pulses in flexible epoxy resin nanocomposites

Montanari

Fabiani

et al. 2012

Appl. Phys. A

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“…More recently, Dissado et al [42] have reported on much faster smaller pulses crossing similar specimens, which they called "soliton-like". They ascribe this to a previously unknown conduction mechanisms which occurs at moderate fields (40-50 kV/mm).…”

Section: Space Charge Measurementsmentioning

confidence: 99%

The coming of Age of HVDC extruded power cables

Fothergill

2014

2014 IEEE Electrical Insulation Conference (EIC)

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Lessons have been learnt from early experiences with AC cables that may be useful in the development of DC cables. DC cables, however, also provide a new set of insulation challenges, primarily associated with the control of conductivity and space charge, which may lead to very high internal electric fields building up in the insulation. Techniques for measuring space charge and conduction are described and discussed in terms of how they might be used to quantify the state of a HVDC cable. Nanodielectrics are likely to play a part in the development of new materials for their insulation. With an understanding of the key processes to control, techniques to control them and new materials, manufacturers now seem keen to embrace extruded power cable technology for HVDC applications. The paper gives a personal perspective on the development of these cables and links it with the author's research over the last 30 years. Permanent repository link:

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Fast space charge behavior in heat‐treated polypropylene films

Zheng

Min

Dong

et al. 2015

J of Applied Polymer Sci

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In this study, the characterization of the short-circuit current within hundreds of nanoseconds is proposed to study the effect of heat treatment on fast space charge behavior in the polarized biaxially oriented polypropylene (BOPP) films. The BOPP films were cooled either quickly or slowly during the sample preparation. The damped oscillating feature was found in the short-circuit current of all the polarized film samples, but the periods of the oscillating current for the samples prepared by fast cooling rate decrease faster. Bipolar space charge injection in the polarized BOPP films was observed by the thermal pulse (TP) measurement. The variation feature of the short-circuit current was considered to be associated with the varying fast space charge behavior, which depended on the varying structural traps modified by the heat treatment during the sample preparation. The sample subjected to fast cooling process was with relatively shallow trap level revealed by the thermally stimulated current method, which led to higher mobility of the escaping charge in the sample. The TP measurements were utilized to analyze space charge features in the polarized BOPP films.

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Fast soliton-like charge pulses in insulating polymers

Cited by 31 publications

References 44 publications

The effect of mechanical relaxation on ultra-fast charge pulses in flexible epoxy resin nanocomposites

The effect of mechanical relaxation on ultra-fast charge pulses in flexible epoxy resin nanocomposites

The coming of Age of HVDC extruded power cables

Fast space charge behavior in heat‐treated polypropylene films

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