Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Hussin, Nuriziani; Chen, G.

doi:10.1109/tdei.2012.6148510

Cited by 64 publications

(32 citation statements)

References 15 publications

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“…Numerous recent experimental studies have attempted to diagnose the electrical tree in XLPE cables [12][13][14][15]. The effect of partial discharges on the electrical properties of the cable has been studied in a lot of investigations [16,17]. Much work has been carried out, and the chemical modifications generated by aging and its consequences on the mechanical and electrical properties of XLPE [10,[18][19][20][21] were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Neural networks and fuzzy logic approaches to predict mechanical properties of XLPE insulation cables under thermal aging

Boukezzi

Bessissa

Boubakeur

et al. 2016

Neural Comput & Applic

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The widespread use of cross-linked polyethylene (XLPE) as insulation in the manufacturing of medium-and high-voltage cables may be attributed to its outstanding mechanical and electrical properties. However, it is well known that degradation under service conditions is the major problem in the use of XLPE as cable insulation. Laboratory investigations of the insulations aging are time-consuming and cost-effective. To avoid such costs, we have developed two models which are based on artificial neural networks (ANNs) and fuzzy logic (FL) to predict the insulation properties under thermal aging. The proposed ANN is a supervised one based on radial basis function Gaussian and trained by random optimization method algorithm. The FL model is based on the use of fuzzy inference system. Both models are used to predict the mechanical properties of thermally aged XLPE. The obtained results are evaluated and compared to the experimental data in depth by using many statistical parameters. It is concluded that both models give practically the same prediction quality. In particular, they have ability to reproduce the nonlinear behavior of the insulation properties under thermal aging within acceptable error. Furthermore, our ANN and FL models can be used in the generalization phase where the prediction of the future state (not reached experimentally) of the insulation is made possible. Additionally, costs and time could be reduced.

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Section: Introductionmentioning

confidence: 99%

Neural networks and fuzzy logic approaches to predict mechanical properties of XLPE insulation cables under thermal aging

Boukezzi

Bessissa

Boubakeur

et al. 2016

Neural Comput & Applic

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“…The accumulation of space charge can lead to the localized electric field enhancement, which will affect the properties of dielectric, such as conductivity, breakdown, aging, etc. [7][8][9] Space charge characteristics are influenced by many factors [10][11][12][13][14], such as temperature, additives, moisture, interface, morphology. When oil paper is thermally aged, the inter-unit linkages in cellulose chains are broken and other properties including permittivity and conductivity change [3,15].…”

Section: Introductionmentioning

confidence: 99%

Space charge behavior evolution with thermal aging of oil-paper insulation

Zhou

Huang

Chen

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Space charge is a threat to insulation materials and oil-paper insulation gradually degrades in service. The degradation of cellulose affects space charge formation, accumulation and dissipation, and the presence of space charge affects the performance of dielectric. In this paper, the effect of thermal aging on space charge behaviors and other properties including permittivity, conductivity, and tensile strength was investigated. Oil-paper samples were aged at a hot spot temperature (180℃). During thermal aging, space charge distribution was measured at a regular interval at room temperature. And the pulse electro-acoustic (PEA) method was used for space charge measurement. The results showed that the thermal aging at hot spot temperature caused increase of conductivity and tensile strength degradation. The permittivity increased at the beginning but then it decreased, while dissipation factor showed an upward trend. Besides these, trap distribution and carriers characteristics were also affected. The formations of space charge of unaged and aged oil paper were consequently different under low electric field. Due to the generation of traps by the degradation of cellulose, more charge, especially positive charge was trapped, but the increased traps mostly were shallow traps. Based on the Schottky model, a correlation between space charge injection and the permittivity was drawn. This, together with the appearance of positive bulk charge could be used for oil paper aging status diagnosis.

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“…Space charge characteristics were affected by many factors, such as temperature, moisture, additive, electrode materials, crystallinity, and so on [22][23][24][25][26]. Although Figure 2 and Figure 9 showed that positive charge injected easier than negative charge from the Al electrode, and Figure 2 indicated that there was no significant difference between the behaviors of negative and positive charge in terms of their quickness, the conclusions could not be drawn as the diversity among oil-paper samples or experiments could not be neglected.…”

Section: Discussionmentioning

confidence: 99%

Influence of voltage reversal on space charge behavior in oil-paper insulation

Huang¹,

Zhou²,

Chen

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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The presence of space charge is a serious threat to the reliability of insulation material under voltage polarity reversal. The results of space charge evolution in oil-paper insulation during external voltage polarity inverse at room temperature were presented in this paper. A mirror image effect charge was observed in the steady state, but the formation of it was affected by the first polarizing, which could cause a change of electrical property. The results showed that the mirror image effect was independent of the involved nature, type and dynamics of charge. Experiments of different reversal polarities and periods indicated that the slow decay of heterocharge retained from previous homocharge injection was the cause of electric field enhancement. And the reversal period therefore had an effect on voltage polarity reversal, namely the shorter the reverse period, the higher the stress enhancement. The reliability of oil-paper insulation could be influenced by the polarity reversal because charge injection and distribution were unpredictable, and space charge modified and in return was affected by the field as well.Index Terms -Space charge, pulse electroacoustic method, oil-paper insulation, voltage reversal, mirror image effect, stress enhancement.

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Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Cited by 64 publications

References 15 publications

Neural networks and fuzzy logic approaches to predict mechanical properties of XLPE insulation cables under thermal aging

Neural networks and fuzzy logic approaches to predict mechanical properties of XLPE insulation cables under thermal aging

Space charge behavior evolution with thermal aging of oil-paper insulation

Influence of voltage reversal on space charge behavior in oil-paper insulation

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