Pressure effect on the space charge in low density polyethylene (LDPE)

Saidi-Amroun, N.; Saïdi, M.; Bendaoud, M.; Essolbi, R.; Elallam, T.

doi:10.1016/0254-0584(93)90110-8

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…As a matter of fact, the electric field and temperature field are two primary physical fields that most studies have focused on [36][37][38][39][40][41]. The experiments above aim at exploring the dynamic charge characteristics of EP-Al composites, which enables the further structural design of DC GIL considering charge threshold and electric field control.…”

Section: Space Charge Resultsmentioning

confidence: 99%

“…Numerous studies have also examined space charge dynamics in EP-based dielectric materials under various operating conditions, such as tense electric stress [28], temperature gradient [29,30], AC/DC superimposed voltage [31], square wave voltage and impulse voltage [32] and high humidity [24,33]. Besides these external factors, mechanical stress can significantly affect the electrical properties of polymer-based insulating materials, including breakdown strength [34], dielectric loss [35] and charge transport characteristics [36][37][38][39]. For example, Wang et al measured space charge dynamics in low-density polyethylene (LDPE) under 0.1 MPa and 100 MPa, concluding that charge injection was suppressed under higher pressure [35].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Wang et al measured space charge dynamics in low-density polyethylene (LDPE) under 0.1 MPa and 100 MPa, concluding that charge injection was suppressed under higher pressure [35]. However, space charge dynamic studies with the consideration of mechanical pressure effects are limited to cable-used insulating materials such as LDPE and XLPE [36,37]. There is a lack of such a study focusing on EP-based dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

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Space charge dynamics of epoxy/micro-Al₂O₃ composites under multi-physical fields

Xie,

Pang,

et al. 2023

J. Phys. D: Appl. Phys.

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The direct current gas insulated transmission line (DC GIL) technique has emerged as a promising solution to achieve carbon neutrality and enable efficient long-distance transmission of renewable energy. However, the stable and long-term operation of DC GIL insulators poses a significant challenge that requires insulating materials capable of overcoming charge accumulation issues against multi-fields, including electric, temperature, and force. Here, we investigate the space charge dynamics and electrical conductivity of epoxy resin and epoxy/micro-Al2O3 composites under various stimuli of electrical, thermal, and mechanical stresses, using two modified pulsed electro-acoustic (PEA) and electrical conductivity measurement systems with mechanical pressure control. It is found that stronger electric fields and higher temperature conditions have a more significant impact on space charge accumulation, while higher mechanical stress results in more shallow traps in epoxy composites. Furthermore, the bipolar carrier transport modeling and numerical calculations are performed to rationalize the experimental observations and reveal the mechanistic impacts of multi-physical fields on the space charge behavior of epoxy composites for DC GIL insulator use.

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Section: Space Charge Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Space charge dynamics of epoxy/micro-Al₂O₃ composites under multi-physical fields

Xie,

Pang,

et al. 2023

J. Phys. D: Appl. Phys.

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“…In addition, the space charge distribution in LDPE is said to be material-dependent. [50][51][52][53] Nurizani Hussin et al, reported a study on space charge accumulation in LDPE by introducing cross-linking bye products, which revealed that, when compared to fresh material, there is a greater amount of space charge accumulation in LDPE due to cross-linking bye products. [54,55] It is also reported that the annealing treatments influence the accumulation of space charge and also the researchers reported that space charge formation in XLPE and LDPE is influenced not only by the cross-linking agent but also by the annealing process used during production.…”

Section: Neat Ldpe Space Chargementioning

confidence: 99%

A review on polymeric insulation for high‐voltage application under various stress conditions

Angalane

Kasinathan

2022

Polymer Composites

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Polymeric material draws a great attraction in the development of insulation for High Votage Direct Current (HVDC) applications. Insulation material is the deciding key factor to increase the operating voltage and to transmit the bulk power with minimized power loss. Premature breakdown, high withstanding temperature, and impacts of space charge accumulation are all issues faced by the insulation material. Material qualities such as dielectric, electrical, structural, and mechanical properties are directly affected by the issues. Therefore, this paper provides an overview of the dielectric properties of polymeric materials and their composites under various stress conditions. The stress includes AC, DC, superimpose and combined (AC and DC) stress under which the dielectric constant, dielectric losses, electrical strength, and space charge distribution of polymeric insulating materials such as low‐density polyethylene, high‐density polyethylene, cross‐linked polyethylene, polypropylene, and random copolymer (RCP), as well as their composites, are explored. Polypropylene and RCP outperform all other polymers in terms of breakdown strength and space charge suppression under various stress conditions. RCP is a developing material that also has the potential to be an effective thermoplastic insulation material in the future.

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“…Many investigations have been performed in order to analyse the discharge currents of polyethylene after dc polarization [1][2][3][4][5][6]. Some of them have suggested that the discharge current can be connected to the movement of an internal charge build-up during the polarization time.…”

Section: Introductionmentioning

confidence: 99%

Discharge currents of low-density polyethylene after polarization under an ac 50 Hz field

Fanjeau

Malec

2000

J. Phys. D: Appl. Phys.

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Discharge currents of low-density polyethylene after a polarization under an ac 50 Hz field have been investigated in both 100 µm thick films and 1 mm thick slabs. These currents have been recorded against the polarization field (10-40 MV m −1 rms), temperature (30, 50 and 70 • C) and the time of polarization (2-200 min). Excellent reproducibility has been observed, except at 70 • C, for which a physical change in the sample's morphology has been suggested. No differences were observed when the polarization time was increased from 2 min to 200 min. The voltage has been switched off after a specified polarity and the results have shown that the sign of the discharging currents can be directly related to this polarity. The effect of the injection process can be neglected as shown by a preliminary measurement made with a novel set-up. These discharge currents have been attributed to the presence of a space charge build-up during the polarization. We propose a model in which carriers are predominantly produced within the bulk. This indicates that these carriers could be activated from donor-like states or could originate from the ionization of impurities which move under the influence of the field and create microscopic charge packets. A numerical simulation has revealed that these currents can result from charge motion and diffusion. We discuss the theoretical results, which are in reasonable agreement with our discharge current measurements.

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Pressure effect on the space charge in low density polyethylene (LDPE)

Cited by 15 publications

References 2 publications

Space charge dynamics of epoxy/micro-Al₂O₃ composites under multi-physical fields

Space charge dynamics of epoxy/micro-Al₂O₃ composites under multi-physical fields

A review on polymeric insulation for high‐voltage application under various stress conditions

Discharge currents of low-density polyethylene after polarization under an ac 50 Hz field

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Pressure effect on the space charge in low density polyethylene (LDPE)

Cited by 15 publications

References 2 publications

Space charge dynamics of epoxy/micro-Al2O3 composites under multi-physical fields

Space charge dynamics of epoxy/micro-Al2O3 composites under multi-physical fields

A review on polymeric insulation for high‐voltage application under various stress conditions

Discharge currents of low-density polyethylene after polarization under an ac 50 Hz field

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Product

Resources

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Space charge dynamics of epoxy/micro-Al₂O₃ composites under multi-physical fields

Space charge dynamics of epoxy/micro-Al₂O₃ composites under multi-physical fields