Modelling electroluminescence in insulating polymers under ac stress: effect of voltage offset and pre-stressing

Baudoin, F.; Mills, D. H.; Lewin, P.L.; Roy, Séverine Le; Teyssèdre, G.; Laurent, Christian; Clain, Stéphane

doi:10.1088/0022-3727/45/32/325303

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…The EL intensity increased with increasing stress frequency at the constant field. The same phenomenon was observed in LDPE when subjected to an applied voltage of 6 kVpeak at 10 Hz, 50 Hz and 100 Hz [40]. Nevertheless, the number of pulses per cycle was found to be declining with increasing frequency [2,15,27,35,41].…”

Section: El Vs Applied Frequencysupporting

confidence: 74%

“…An extensive electroluminescence model on LDPE has been proposed [40,45] that takes into account the charge carriers' recombination, injection, extraction and charge transport. The model produced a good correlation between measured and simulated phase-resolved electroluminescence intensity regarding its time dependency and types of applied voltage waveforms.…”

Section: Modelling Of El Using Dimensional Analysismentioning

confidence: 99%

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Modelling Electroluminescence Emission in Polymeric Material Using Dimensional Analysis Method

et al. 2023

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The Electroluminescence (EL) technique has garnered significant interest over time for its reliable outcomes that enrich our understanding of the onset of electrical degradation in polymeric material. There is growing interest in combining both the EL technique and space charge measurement methods to obtain a more profound knowledge of the degradation and ageing of insulation. The generation of charge carriers in polymeric materials is widely acknowledged to be a crucial aspect of EL, involving injection, de-trapping, and field dissociation processes. This research investigates the variables that influence how EL emissions behave, including applied voltage or electric field, applied electrical frequency, ageing of material, and selection of materials and gases employed. It was found that these factors can be helpful in predicting the process of electrical ageing in insulation to avoid any catastrophes that may occur. A mathematical approach relating these factors and the intensity of EL is proposed through the aid of Dimensional Analysis method. A close relationship is obtained that suggests this mathematical approach can be utilised as a tool to predict electrical ageing of insulation material.

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Section: El Vs Applied Frequencysupporting

confidence: 74%

Section: Modelling Of El Using Dimensional Analysismentioning

confidence: 99%

Modelling Electroluminescence Emission in Polymeric Material Using Dimensional Analysis Method

et al. 2023

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“…The change from homocharge to heterocharge near the cathode is likely to have a marked effect on charge injection processes and, consequently, should affect many different electrical factors [52,53].…”

Section: Space Charge Dynamicsmentioning

confidence: 99%

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Lau

Vaughan

Chen

et al. 2016

J. Phys. D: Appl. Phys.

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The topic of nanodielectrics continues to receive significant attention from today's dielectrics community, due to the property enhancements that can stem from the unique interfacial features within such material systems. Nevertheless, understanding of the interfacial phenomena that occur in nanodielectrics and which determine their electrical behaviour is challenging. In this paper, we report on an investigation into the absorption current behaviour of two nanocomposite systems, one containing an untreated nanosilica and the other containing the same nanofiller chemically modified using trimethoxy(propyl)silane.The results indicate that the absorption current behaviour of all the nanocomposites is very different from that of the reference, unfilled polymer; while the current flowing through the unfilled polyethylene decreased monotonically with time in a conventional manner, all nanocomposites revealed an initial decrease followed by a period in which the current increased with increasing time of electric field application. Possible mechanisms leading to the observed absorption current behaviour in the nanocomposites are discussed with the aid of space charge measurements. The presence of space charge limited conduction (SCLC) and its trap-filled limit is proposed.Keywords: nanocomposites, nanosilica, interface, absorption current, space charge limited conduction. 2 IntroductionThe addition of a nanofiller to a polymer matrix has been shown to be a flexible means of tailoring the dielectric properties of materials [1][2][3] and Chen et al. [19], for example, have emphasized the unsatisfactory nature of our understanding of charge transport mechanisms. In conventional polymeric insulation, charge transport mechanisms are extremely complicated, when compared with many conducting and semiconducting materials [20,21]. In semicrystalline polyethylene, for example, chainfolded lamellar crystals are surrounded by amorphous conformations and there is likely to be a high concentration of traps relating to each of these structural motifs. On the addition of a nanofiller, charge transport mechanisms will become yet more complicated, since the inclusion of nanoparticles will introduce extensive interfacial surfaces between the nanofiller and the polymer. The presence of such interfaces may directly introduce additional nanofiller/polymer trapping sites and/or modify the surrounding polymer morphology, thereby affecting the local density of states within the system.The current flow caused by the action of an applied electric field on charge carriers within a dielectric material can broadly be categorized into three types [22]: the initial current that flows through the material is the capacitive charging current, which causes a dramatic rise at the very beginning of the voltage application. This is followed by a gradual decrease of current, known as the absorption current or the anomalous current. Conventionally, the absorption current decreases slowly until it reaches a quasi-steady state, providing a conduction c...

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“…Griseri et al [13] used three different kinds of stimulation models, which were photoluminescence, luminescence, and the recombination of electrical charges, to explain the light emission spectrums excited by different fields. Baudoin et al [14, 15] proposed a transport model based on [16] the description of electroluminescence in polyethylene films under AC stress, simulated and experimental results were compared and voltage offset and pre‐stressing were considered. The connection between charge distribution and light emission was discussed in [17, 18] and the difficulty for identifying the transport mechanisms in insulating polymers was explained in [19].…”

Section: Introductionmentioning

confidence: 99%

Light emission characteristics during the initiation of the electric tree in insulating polymers

Zhang

2017

J. eng.

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Modelling electroluminescence in insulating polymers under ac stress: effect of voltage offset and pre-stressing

Cited by 6 publications

References 9 publications

Modelling Electroluminescence Emission in Polymeric Material Using Dimensional Analysis Method

Modelling Electroluminescence Emission in Polymeric Material Using Dimensional Analysis Method

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Light emission characteristics during the initiation of the electric tree in insulating polymers

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