Investigation of dielectric behavior of thermally aged XLPE cable in the high-frequency range

Kim, Chonung; Jin, Zhijian; Jiang, Pingkai; Zhu, Zicai; Wang, Genlin

doi:10.1016/j.polymertesting.2006.03.009

Cited by 88 publications

(46 citation statements)

References 15 publications

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“…However, these excellent properties are only for unaged nanocomposites, and the properties of aged nanocomposites have not been fully understood. In addition, researches had indicated that the maximum operating temperature of cable insulation can reach 90 ∘ C, and the good dielectric properties of insulation material may bring some unwanted drawbacks to its performance under high temperature condition [14,15]. Therefore, it is necessary to further research the thermal aging behaviors of polyethylene/TiO 2 nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Wang

Xiao

et al. 2017

Journal of Nanomaterials

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The ability of antithermal aging of LDPE/TiO 2 nanocomposites was investigated through SEM, FTIR, DSC, and dielectric properties in this paper. The results of SEM images showed that the thermal aging had a significant influence on the structure of Pure-LDPE and LDPE/TiO 2 samples. The measurement of FTIR showed that the content of hydroxyl and carboxyl increased with thermal aging, but the time of emerging aging characteristic peaks for the LDPE/TiO 2 samples was delayed. The DSC measurement indicated that filling TiO 2 nanoparticles changed the crystallization behavior of LDPE, played a role of heterogeneous nucleation during the process of recrystallization, and improved the crystallinity of LDPE/TiO 2 . Similarly, the aged LDPE/TiO 2 samples had lower permittivity and dissipation factor compared to the aged Pure-LDPE samples. All the results had indicated the LDPE/TiO 2 samples had the significant ability of antithermal aging, especially the LDPE/TiO 2 -0.5 samples with good dispersion of nanoparticles. A new model was proposed to illustrate the antithermal aging behaviors of LDPE/TiO 2 samples, which shows that the TiO 2 nanoparticles play a role of "crosslinking points" between LDPE molecular chains, increasing the density of crystal structure and reducing oxygen diffusion into materials to break molecular structure.

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Section: Introductionmentioning

confidence: 99%

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Wang

Xiao

et al. 2017

Journal of Nanomaterials

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“…8,[23][24][25][26]29 Therefore, the real and imaginary parts of the complex dielectric constant increase with the increase of aging time. Figure 14 shows the AC leakage current spectra in different aging stages.…”

Section: Test Results and Analysis Of Thermal Aging At 150 • Cmentioning

confidence: 99%

“…So the complex dielectric modulus M * is calculated in this paper, and the relaxation process of XLPE was characterized and analyzed by the complex dielectric modulus spectrum. The complex dielectric modulus is in reciprocal relation with the complex permittivity, 16,17 and can be expressed by the formulas (6) to (8). M is the real part of the dielectric modulus and M" is the imaginary part of the dielectric modulus.…”

Section: Theoretical Basismentioning

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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“…Infrared spectroscopy (IR) has been widely used in identifying these components as well as the oxidation phenomena in XLPE [11][12][13][14][15]. The major by-products of thermooxidative processes are carbonyl groups that show absorbency peaks at 1741 cm -1 (aldehyde absorption) [16][17][18][19] for acetophenone [20; 21].…”

Section: Introductionmentioning

confidence: 99%

Annealing effect on the conductivity of XLPE insulation in power cable

Diego

Belana

Orrit

et al. 2011

IEEE Trans. Dielect. Electr. Insul.

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Conductivity () in XLPE insulation of power cables annealed at 90 ºC at temperatures between 50 and 97 ºC has been measured. In all cases there is an initial increase in conductivity that develops a maximum and finally decreases for long annealing times. This maximum appears in the sample annealed 20 days when conductivity is measured at 50 ºC and shifts gradually to higher annealing times up to 40 days when the measurement is performed at 97 ºC. A linear behavior of ln() versus T -1/4 is observed, which implies that the transport mechanism is basically via thermally assisted hopping conduction. Infrared spectroscopy indicates that, during annealing, some chemical species diffuse from the semiconducting shields (SC) into the XLPE. Thermally stimulated depolarization currents technique (TSDC) and intensity-current measurements (I-V) point out as well the presence of this diffusion process that becomes less significant after long annealing times. The initial increase in  is explained in terms of the increase in traps density due to the diffusion process from the SC shields. Long term decrease in  is justified by the observed decrease of diffusion rate for long annealing times.

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Investigation of dielectric behavior of thermally aged XLPE cable in the high-frequency range

Cited by 88 publications

References 15 publications

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Influence of thermal aging on AC leakage current in XLPE insulation

Annealing effect on the conductivity of XLPE insulation in power cable

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Investigation of dielectric behavior of thermally aged XLPE cable in the high-frequency range

Cited by 88 publications

References 15 publications

Research on the Thermal Aging Behaviors of LDPE/TiO2 Nanocomposites

Research on the Thermal Aging Behaviors of LDPE/TiO2 Nanocomposites

Influence of thermal aging on AC leakage current in XLPE insulation

Annealing effect on the conductivity of XLPE insulation in power cable

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Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites