DSC Study of Artificial Thermal Aging of XLPE Insulation Cables

Boukezzi, Larbi; Boubakeur, A.; Laurent, Christian; Lallouani, M.

doi:10.1109/icsd.2007.4290774

Cited by 36 publications

(28 citation statements)

References 9 publications

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“…(DSC) Differential Scanning Calorimetry (DSC) enables quantitative measurements of the melting and crystallizing performance of polymers and can be used to reveal details of their crystalline nature [25,26,28]. Thermal properties of the specimens were studied with instruments DSC 822, which was connected to a computer for receiving, storing and analyzing data.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Physicochemical origin of space charge dynamics for aged XLPE cable insulation

Wang

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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The occurrence of ageing of cross-linked polyethylene (XLPE) cable insulation greatly affects the safe operation of cable system. The influence of different ageing modes on the space charge dynamics and physicochemical properties of insulating materials in highvoltage alternating current (HVAC) XLPE cables was investigated. The XLPE specimens were obtained from un-aged cables, 1-year laboratory accelerated aged cables, and 22-year practical cables. Pulsed Electro-Acoustic (PEA) technique was used to measure the space charge dynamics and accumulation properties in the aged XLPE insulation. Differential Scanning Calorimetry (DSC) and Fourier-Transform Infrared (FTIR) were used to reveal the details of their physicochemical properties. It was found that the homocharge accumulated at the aluminum (Al) electrode for the un-aged cables, while the hetero-charge for aged cable insulations. The total amount of homo-charge near anode decreases with temperature for un-aged specimens, while the amount of hetero-charge increases with temperature for aged specimens. It was suggested that, the homo-charge results from charge injection of electrodes, and the hetero-charge appear to be intimately related with the ionization of ageing products in XLPE insulation. Additionally, the total charge of un-aged cables and 22-year practical cables increased along the radial direction from inner to outer, whereas the total charge of 1-year accelerated aged cables decreased. It was suggested that accelerated ageing of cables starts from the inside of the insulating materials, while ageing of 22-year practical cables starts from the outside. It was also found that two new absorption peaks appeared in FTIR spectrums of aged specimens around 1720 cm -1 and 3500 cm -1 , and the carbonyl groups increase with ageing time. The crystallization morphology, impurity particles ionization, injection and transportation of charges show great effect on the space charge dynamics.

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Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Physicochemical origin of space charge dynamics for aged XLPE cable insulation

Wang

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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“…Under heat conditions, thermal aging occurs and causes an irreversible damage of the cable insulation. Under temperature stress and over a period of time, chemical composition [6] and physical morphology [7,8] of XLPE may change. Consequently, several properties may alter.…”

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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“…The Irganox 1035 antioxidant presents absorption band, which occurs at about 1078 cm −1 . The peaks at 1718 cm −1 and 1741 cm −1 indicate the presence of a small number of carbonyl structures namely ketones and aldehydes …”

Section: Resultsmentioning

confidence: 99%

“…The wave number 1305 cm −1 corresponds to the absorption of the acetophenone, which is a crosslinking decomposition product. The band at 2361 cm −1 attributed to CO 2 species, increased with increasing irradiation.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

Hedir

Moudoud

Lamrous

et al. 2019

J of Applied Polymer Sci

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This article deals within the study of the effect of artificial radiations on physical and chemical properties of the crosslinked polyethylene (XLPE) material, widely used for manufacturing high-voltage cables. Within this framework, several experimental tests, using essential characterization techniques, were performed to study XLPE behavior under ultraviolet (UV) aging. Attenuated total reflection Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy were thus carried out to identify the main structure changes of the material before and after exposure to UV. In addition, appearance changes and DC (Direct Current) volume resistivity were evaluated. The obtained results showed that UV radiation has a great effect on the physicochemical properties of XLPE cable insulation.

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DSC Study of Artificial Thermal Aging of XLPE Insulation Cables

Cited by 36 publications

References 9 publications

Physicochemical origin of space charge dynamics for aged XLPE cable insulation

Physicochemical origin of space charge dynamics for aged XLPE cable insulation

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

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

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