Effect of thermal aging on the electrical properties of crosslinked polyethylene

Nedjar, Mohammed

doi:10.1002/app.29053

Cited by 48 publications

(34 citation statements)

References 10 publications

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“…This has also seen by other workers, e.g. [46]. The cables were obviously oxidised and the increase in conductivity may be due to the molecular bonds being weakened and an increase in free volume.…”

Section: Conductivity Measurementssupporting

confidence: 83%

The coming of Age of HVDC extruded power cables

Fothergill

2014

2014 IEEE Electrical Insulation Conference (EIC)

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Lessons have been learnt from early experiences with AC cables that may be useful in the development of DC cables. DC cables, however, also provide a new set of insulation challenges, primarily associated with the control of conductivity and space charge, which may lead to very high internal electric fields building up in the insulation. Techniques for measuring space charge and conduction are described and discussed in terms of how they might be used to quantify the state of a HVDC cable. Nanodielectrics are likely to play a part in the development of new materials for their insulation. With an understanding of the key processes to control, techniques to control them and new materials, manufacturers now seem keen to embrace extruded power cable technology for HVDC applications. The paper gives a personal perspective on the development of these cables and links it with the author's research over the last 30 years. Permanent repository link:

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Section: Conductivity Measurementssupporting

confidence: 83%

The coming of Age of HVDC extruded power cables

Fothergill

2014

2014 IEEE Electrical Insulation Conference (EIC)

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“…In Figure 5, the effect of ageing on cables without an outer semicon layer can be observed. The color of the XLPE insulation layer changed from translucent grey to a rich, less transparent, brown, which is presumably indicative of thermo-oxidative degradation likely to occur under these circumstances [10]. It has been reported that, as well as an expected change in coloration, this ageing may lead to an increase in free volume and the mobility of charge carriers [10].…”

Section: Samplesmentioning

confidence: 99%

The measurement of very low conductivity and dielectric loss in XLPE cables: a possible method to detect degradation due to thermal aging

Fothergill

Dodd

Dissado

et al. 2011

IEEE Trans. Dielect. Electr. Insul.

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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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Effect of thermal aging on the electrical properties of crosslinked polyethylene

Cited by 48 publications

References 10 publications

The coming of Age of HVDC extruded power cables

The coming of Age of HVDC extruded power cables

The measurement of very low conductivity and dielectric loss in XLPE cables: a possible method to detect degradation due to thermal aging

Influence of thermal aging on AC leakage current in XLPE insulation

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