Temperature effect on the space charge characteristics in as-received and degassed XLPE insulation under DC stressing condition

Ho, Y.F.F.; Chong, Y.L.; Chen, G.

doi:10.1109/ceidp.2003.1254838

Cited by 7 publications

(7 citation statements)

References 2 publications

(1 reference statement)

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“…This increase in the interfacial stress enhanced charge injection which neutralised some of the heterocharges which had accumulated. Figure 10 shows the fast charge profiles in sample A, which were computed using equation 5, and their integrals over 24 (6) hours of ageing. Unlike the charges in the volt-off space charge profiles which are trapped in the sample, fast charges are charges which disappeared almost immediately after the removal of the applied voltage.…”

Section: As-received Samplesmentioning

confidence: 99%

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Temperature effect on space charge dynamics in XLPE insulation

Chong

Chen

2007

IEEE Trans. Dielect. Electr. Insul.

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This paper reports on space charge evolution in crosslinked polyethylene (XLPE) planar samples approximately 1.20 mm thick subjected to electric stress level of 30 kV dc /mm at four temperatures 25, 50, 70 and 90 o C for 24 h. Space charge profiles in both asreceived and degassed samples were measured using the laser induced pressure pulse (LIPP) technique. The dc threshold stresses at which space charge initiates are greatly affected by testing temperatures. The results suggest that testing temperature has numerous effects on space charge dynamics such as enhancement of ionic dissociation of polar crosslinked by-products, charge injection, charge mobility and electrical conductivity. Space charge distributions of very different nature were seen at lower temperatures when comparing the results of as-received samples with degassed samples. However at higher temperature, the space charge distribution took the same form, although of lower concentration in degassed samples. Space charge distributions are dominated by positive charge when tested at high temperatures regardless of sample treatment and positive charge propagation enhances as testing temperature increases. This can be a major cause of concern as positive charge propagation has been reported to be related to insulation breakdown.

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Section: As-received Samplesmentioning

confidence: 99%

“…However, most of such research work was conducted at room temperature while space charge dynamics in XLPE under dc electric stress at different temperatures has only received limited attention [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on space charge dynamics in XLPE insulation

Chong

Chen

2007

IEEE Trans. Dielect. Electr. Insul.

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“…It is imperative to explore the properties of EL emission at high temperatures since most electrical engineering systems work at temperatures as high as 300 K. However, there are not many works of literature that report on the influence of temperature of working conditions on the intensity of EL emission. In contrast, several literatures are investigating the impact of temperature on the space charge distribution [52][53][54]. As described previously, space charges have a huge impact on the local field of polymer that consequently affect the intensity of EL emission.…”

Section: El Vs Temperaturementioning

confidence: 99%

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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“…This leads to a local field enhancement within the material that may cause insulation degradation and ultimately, electrical breakdown. However, most of such work was conducted at room temperature while space charge dynamics in insulation under dc electric stress at different temperatures has only received limited attention [1][2][3][4][5][6][7][8][9][10][11][12][13].The main objective of the present study is to provide a better understanding about the mechanisms responsible for space charge accumulation when a temperature is present across the insulation. To that purpose, we performed space charge measurements at different temperature, at both positive and negative polarity of the test voltage.…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on space charge dynamics in multi-layer insulation Fluorinated Ethylene Propylene (FEP) Low Density Polyethylene (LDPE)

Rogti

Ferhat

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Space charge behavior at dielectric interfaces in multi-layer Fluorinated Ethylene Propylene (FEP) and Low Density Polyethylene (LDPE) subjected to a dc field has been investigated as a function of the temperature using the pulsed electro acoustic (PEA) technique.A sandwich structure constituted by two dielectric films not identical FEP/LDPE was used to study the charging propensity of electrode/dielectric and dielectric/ dielectric interface. The time dependence of the space charge distribution was subsequently recorded at different temperature under field (polarization) and short circuit condition (depolarization). Experimental results demonstrated that charge injected process take place in all cases. However it is shown that the amount of interfacial charge depends drastically on the temperature. It has greater influence on the distribution, injection and mobility of space charge in the bulk and at dielectric/ dielectric interfaces.

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Temperature effect on the space charge characteristics in as-received and degassed XLPE insulation under DC stressing condition

Cited by 7 publications

References 2 publications

Temperature effect on space charge dynamics in XLPE insulation

Temperature effect on space charge dynamics in XLPE insulation

Modelling Electroluminescence Emission in Polymeric Material Using Dimensional Analysis Method

Temperature effect on space charge dynamics in multi-layer insulation Fluorinated Ethylene Propylene (FEP) Low Density Polyethylene (LDPE)

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