The effect of dc poling duration on space charge relaxation in virgin XLPE cable peelings

Tzimas, A.; Rowland, S. M.; Dissado, L.A.; Fu, Mingli; Nilsson, U.H.

doi:10.1088/0022-3727/43/21/215401

Cited by 27 publications

(16 citation statements)

References 27 publications

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“…It must be noted here that the time delay in the PEA measurement immediately after the applied voltage was removed does not allow us to detect shallower traps. 5 Our trap depth data obtained is in accordance with the value obtained by the others, 5,19 and it does …”

Section: Trap Depthssupporting

confidence: 90%

Charge trapping and detrapping in polymeric materials: Trapping parameters

Zhou¹,

Chen²,

Liao³

et al. 2011

Journal of Applied Physics

153

111

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Space charge formation in polymeric materials can cause some serious concern for design engineers as the electric field may severely be distorted, leading to part of the material being overstressed. This may result in material degradation and possibly premature failure at the worst. It is therefore important to understand charge generation, trapping, and detrapping processes in the material. Trap depths and density of trapping states in materials are important as they are potentially related to microstructure of the material. Changes in these parameters may reflect the aging taken place in the material. In the present paper, characteristics of charge trapping and detrapping in low density polyethylene (LDPE) under dc electric field have been investigated using the pulsed electroacoustic (PEA) technique. A simple trapping and detrapping model based on two trapping levels has been used to qualitatively explain the observation. Numerical simulation based on the above model has been carried out to extract parameters related to trapping characteristics in the material. It has been found that the space charge decaying during the first few hundred seconds corresponding to the fast changing part of the slope was trapped with the shallow trap depth 0.88 eV, with trap density 1.47 × 1020 m−3 in the sample volume measured. At the same time, the space charge that decays at longer time corresponding to the slower part of the slope was trapped with the deep trap depth 1.01 eV, with its trap density 3.54 × 1018 m−3. The results also indicate that trap depths and density of both shallow and deep traps may be used as aging markers as changes in the material will certainly affect trapping characteristics in terms of trap depth and density.

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Section: Trap Depthssupporting

confidence: 90%

Charge trapping and detrapping in polymeric materials: Trapping parameters

Zhou¹,

Chen²,

Liao³

et al. 2011

Journal of Applied Physics

153

111

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show abstract

“…In recent years, trap parameters of polymers have been evaluated. 11,13,14 Specially, Chen proposed a dual-level trap model based on space charge characteristics in polymers. 11,12 It describes the aging characteristics in polymer by dual levels of traps, which are termed as shallow trap and deep trap.…”

Section: Introductionmentioning

confidence: 99%

Trap characterization in composite of solid-liquid using dual-level trap model and TSDC method

et al. 2016

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Charge trap is considered to be one of the effective characteristic parameters for qualitatively evaluating the aging status of insulating material. In this paper, the trap characteristics in oil-impregnated paper with different aging types (non-treatment, thermal treatment and electrical treatment) are investigated using a dual-level (shallow and deep energy) trap model based on space charge profiles and thermally stimulated depolarization current (TSDC) data. The simulated results based on the model are well consistent with the experimental results. On the other hand, the TSDC method can acquire much information related to the shallower traps, and the dual–level trap model can obtain much charge dynamics characteristics. It has been observed that thermally aging makes the shallow trap energy become deeper while electrically aging makes it shallower. Moreover, the trap density in oil-impregnated paper increases after aging regardless of thermal or electrical aging.

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“…In recent years, many approaches have been developed on determination or estimation of these trapping parameters for various insulation materials, especially polyethylene [13][14][15][16][17][18] . Chen proposed a trapping-detrapping model based on two energy levels.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of epoxy resin, Dissado et al proposed a model considering charge detrapping process within three steps 15 . Futhermore, with such model, trapping parameters of different-time aged cross-linked polyethylene (XLPE) cable peelings 16 were evaluated.…”

Section: Introductionmentioning

confidence: 99%

An improved model to estimate trapping parameters in polymeric materials and its application on normal and aged low-density polyethylenes

Liu

Alghamdi

et al. 2015

Journal of Applied Physics

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Trapping parameters can be considered as one of the important attributes to describe polymeric materials. In the present paper, a more accurate charge dynamics model has been developed, which takes account of charge dynamics in both volts-on and off stage into simulation. By fitting with measured charge data with the highest R-square value, trapping parameters together with injection barrier of both normal and aged low-density polyethylene (LDPE) samples were estimated using the improved model. The results show that, after long-term ageing process, the injection barriers of both electrons and holes is lowered, overall trap depth is shallower and trap density becomes much greater. Additionally, the changes in parameters for electrons are more sensitive than those of holes after ageing.

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The effect of dc poling duration on space charge relaxation in virgin XLPE cable peelings

Cited by 27 publications

References 27 publications

Charge trapping and detrapping in polymeric materials: Trapping parameters

Charge trapping and detrapping in polymeric materials: Trapping parameters

Trap characterization in composite of solid-liquid using dual-level trap model and TSDC method

An improved model to estimate trapping parameters in polymeric materials and its application on normal and aged low-density polyethylenes

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