Determination of threshold electric field for charge injection in polymeric materials

Liu, Ning; Zhou, Churui; Chen, George; Zhong, Lisheng

doi:10.1063/1.4921050

Cited by 60 publications

(28 citation statements)

References 9 publications

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“…3 gives space charge dynamics during the volts-on period. In order to obtain the injected space charge profiles in the bulk, the subtraction method was employed to eliminate the capacitive charges on two electrodes 31 , as in Fig. 4.…”

Section: Space Charge Results and Calculationmentioning

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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Section: Space Charge Results and Calculationmentioning

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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“…The injection of charge carriers occurs at the interface between the conductor and the insulator when the applied electric field is higher than the threshold field. From the previous work done by Liu et al [13], a value of threshold electric field about 10 kV/mm has been identified for charge injection in polyethylene. In this study, when the applied field exceeds the critical value (10 kV/mm), the boundary condition is defined by the Schottky injection at both electrodes.…”

Section: Continuity Equationmentioning

confidence: 99%

Space charge modelling in HVDC extruded cable insulation

Zhan

Hao

2019

IEEE Trans. Dielect. Electr. Insul.

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With the growing interest in the development of HVDC cable technologies, the impact of space charge accumulation inside the polymeric insulation has attracted more attentions and the field distribution across the insulation has become the focus point of research. In this paper, several modifications have been applied on the bipolar charge transport model developed for the cable geometry. Based on many experimental observations, a threshold electric field at which the charge injection takes place was introduced. Considering the practical operation of HVDC cables, the thermal transient effects on space charge behaviors were particularly taken into account. A changing current flow has been applied in the core of a MV size cable, in order to further study the charge dynamics and to anticipate the field distribution within the insulation. The simulation results suggest that the thermal transient can affect the amount of injected charge and the charge movement significantly. The field inversion can only take place with higher temperature and larger temperature gradient, and this can be maintained even with temperature decreasing.

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“…1(a) and 1(d) give the space charge dynamics during the voltson period. In order to obtain the injected space charge in the bulk, subtraction method was employed to eliminate the capacitive charges on two electrodes [10], as in Figs …”

Section: Space Charge Results and Calculation Of Charge Amountmentioning

confidence: 99%

Trapping parameters estimation of fresh and thermally-aged low-density polyethylene by using an improved trapping/detrapping model

Liu

et al. 2015

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Abstract-In the present paper, trapping parameters of normal and thermally aged low-density polyethylene (LDPE) samples were estimated using the improved charge dynamic model. The results show that, after long-term thermal ageing process, the injection barrier of both electrons and holes is lowered, the overall trap depth is shallower and electron trap density becomes much greater. The latter may indicate that electrons are more sensitive to ageing than those of holes.

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Determination of threshold electric field for charge injection in polymeric materials

Cited by 60 publications

References 9 publications

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

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

Space charge modelling in HVDC extruded cable insulation

Trapping parameters estimation of fresh and thermally-aged low-density polyethylene by using an improved trapping/detrapping model

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