Dynamic of a Space Charge in Gamma-Irradiated Cross-Linked Polyethylene (XLPE)

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

et al. 2021

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The current study focuses on the influence of ionizing radiation on the dynamics of space charge in crosslinked polyethylene (XLPE) with the presence of a stored charge. For this purpose, electron-beams have been chosen to implant charges in a regulated manner near to the grounded electrode. At the completion of the irradiation procedure, the Pulsed Electro Acoustic (PEA) technique was utilized to quantify space charge in each sample under ambient circumstances. The measurements of space charges in the presence of a 40 kV/mm electric field reveal the formation of two heterocharges close to the implanted charge and the anode respectively. The charge accumulated persists during the relaxation and electrostatic equilibrium appears to be reached inside the insulation between the various types of charges.

Section: Discussionsupporting

confidence: 56%

Space Charge in Gamma and Electron-Beam Irradiated XLPE

Mouchache

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

et al. 2021

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“…PEA measurements were performed using the classic PEA setup [9]. Experiments were carried out at room temperature and atmospheric pressure.…”

Section: Space Charge Measurementsmentioning

confidence: 99%

Effect of Gamma Radiation on Charge Storage in PTFE Exposed to Electron Beam

Mezouar

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

et al. 2021

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In this work, we focus our attention on data obtained from Pulse Electro Acoustic (PEA) measurements on PTFE films before and after irradiation with a 60 Co gamma radiation source. At first, samples are just polarized to determine the effect of the gamma irradiation on the charge transport in the bulk. In a second stage, these films have been exposed to a mono-energetic electron beam. The aim is to study the effect of gamma radiation on charge storage in the bulk.

“…This may also cause the formation of space charges within the polymer, as seen in crosslinked polyethylene (XLPE). For the latter, changes in the electrical behavior has been related to radiation-induced structural changes [5] [6]. Many studies have shown that space charges contribute to the electrical behavior of XLPE.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have shown that space charges contribute to the electrical behavior of XLPE. A substantial amount of research has been conducted on the origin and effect of space charge formation on dielectric reliability [6][7][8]. Conversely, the origin of the space charge in PTFE is still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gamma-Irradiation on Creation and Dynamic of Space Charge in PTFE

Mezouar

2022 IEEE 4th International Conference on Dielectrics (ICD)

et al. 2022

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Electrical properties of polymers undergo significant changes when exposed to ionizing radiation which may alter insulation reliability in radiative environment. The aim of this work is to investigate the effect of gamma-irradiation on the creation and the dynamic of space charges in PolyTetraFluoroEthylene (PTFE). The 200 µm thick PTFE films were exposed to a 60 Co gamma radiation source to different doses 30, 60 and 100 kGy at a constant dose rate. Space charge measurements were achieved by Pulsed Electro-Acoustic method under a field of 40 kV/mm on virgin and irradiated films. Unlike in virgin sample, positive and negative heterocharges were observed in a few minutes after irradiation. The results highlight the creation of pair of charges and the structural modification of the polymer that enhances their mobility. These space charge effects go with a strong increase of the polymer conductivity.