Dielectric and mechanical behavior of cross-linked polyethylene under thermal aging

Mecheri, Yacine; Boukezzi, Larbi; Boubakeur, A.; Lallouani, M.

doi:10.1109/ceidp.2000.884022

Cited by 40 publications

(20 citation statements)

References 3 publications

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“…Consequently, several properties may alter. For example, volume resistivity reduces, dielectric losses increase [9] and mechanical properties decrease [10].…”

Section: Introductionmentioning

confidence: 98%

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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“…Consequently, several properties may alter. For example, volume resistivity reduces, dielectric losses increase [9] and mechanical properties decrease [10].…”

Section: Introductionmentioning

confidence: 98%

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

Self Cite

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“…[23][24][25] With the rise of aging temperature, the molecular movement of the polymer chains intensifies, the viscosity reduces and the conductivity increases significantly. Meanwhile, the antioxidant is gradually consumed and the cross-linking degree decreases, then ε and ε increase as a whole.…”

Section: B Test Results and Analysis Of Thermal Aging In The Range Omentioning

confidence: 99%

“…Meanwhile, the antioxidant is gradually consumed and the cross-linking degree decreases, then ε and ε increase as a whole. [23][24][25][26] When the electric field frequency is very low, the carriers in XLPE would accumulate at the interface and in the defects and form the interfacial polarization. In addition, there are many factors influencing the XLPE dielectric constant, such as the steering of the molecular chain, the fracture of the macromolecular chain, the dipole turn formed by oxidation, and the ion displacement polarization caused by the ionization of impurities, which are generated by the alternating electric field.…”

Section: B Test Results and Analysis Of Thermal Aging In The Range Omentioning

confidence: 99%

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Influence of thermal aging on AC leakage current in XLPE insulation

et al. 2018

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Research on aging parameters of XLPE cable based on isothermal relaxation current AIP Advances 8, 075323 (2018) Cross-linked polyethylene (XLPE) has been widely used as cable insulation material because of its excellent dielectric properties, thermal stability and solvent resistance. To understand the influence of thermal aging on AC leakage current in XLPE insulation, all XLPE specimens were aged in oven in temperature range from 120 • C to 150 • C, and a series of tests were conducted on these XLPE specimens in different aging stages to measure the characteristic parameters, such as complex permittivity, leakage current and complex dielectric modulus. In the experiments, the effects of thermal aging, temperature and frequency on the AC leakage current in XLPE insulation were studied by analyzing complex dielectric constant and dielectric relaxation modulus spectrum, the change of relaxation peak and activation energy. It has been found that the active part of leakage current increases sharply with the increase of aging degree, and the test temperature and frequency have an influence on AC leakage current but the influence of test temperature is mainly reflected in the low frequency region. In addition, it has been shown by the experiments that the reactive part of leakage current exhibits a strong frequency dependent characteristic in the testing frequency range from 10 -2 Hz to 10 5 Hz, but the influence of test temperature and thermal aging on it is relatively small. © 2018 Author (s)

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“…The internal defects of cable joints are the main cause of explosions in cable joints. Explosions of cable joints happen due to internal defects that cause changes in the physical fields of cable joints, including electromagnetic fields [4,5], temperature fields [6,7] and stress fields [8][9][10]. Therefore, in order to protect the cable joints and avoid cable joint accidents, especially explosions, it is important to analyze the electromagnetic-thermal-mechanical characteristics of cable joints under internal defect conditions and find methods to evaluate the internal defects of cable joints [11].…”

Section: Introductionmentioning

confidence: 99%

The Coupling Fields Characteristics of Cable Joints and Application in the Evaluation of Crimping Process Defects

Yang

Cheng³

et al. 2016

Energies

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Abstract:The internal defects of cable joints always accelerate the deterioration of insulation, until finally accidents can arise due to the explosion of the joints. The formation process of this damage often involves changes in the electromagnetic, temperature and stress distribution of the cable joint, therefore, it is necessary to analyze the electromagnetic-thermal-mechanical distribution of cable joints. Aiming at solving this problem, the paper sets up a 3-D electromagnetic-thermal-mechanical coupling model of cable joints under crimping process defects. Based on the model, the electromagnetic losses distribution, temperature distribution and stress distribution of a cable joint and body are calculated. Then, the coupling fields characteristics in different contact coefficient k, ambient temperature T amb and load current I were analyzed, and according to the thermal-mechanical characteristics of a cable joint under internal defects, the temperature difference ∆T f and stress difference ∆σ f of cable surface are applied to evaluate the internal cable joint defects. Finally, a simplified model of the cable joint is set up to verify the accuracy of the coupling field model proposed in this paper, which indicates that the model can be used to analyze the coupling fields characteristics of cable joints and the method can be applied to evaluate crimping process defects of cable joints.

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Dielectric and mechanical behavior of cross-linked polyethylene under thermal aging

Cited by 40 publications

References 3 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

Influence of thermal aging on AC leakage current in XLPE insulation

The Coupling Fields Characteristics of Cable Joints and Application in the Evaluation of Crimping Process Defects

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