Morphological, Structural, and Dielectric Properties of Thermally Aged AC 500 kV XLPE Submarine Cable Insulation Material and Its Deterioration Condition Assessment

Liu, Zhiqian; Hao, Jian; Liao, Ruijin; Li, Jian; Gao, Z.; Liang, Zhengbo

doi:10.1109/access.2019.2953127

Cited by 20 publications

(14 citation statements)

References 33 publications

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“…Generally, the carbonyl index is used to characterise the degradation state of XLPE insulation material effectively [19 ]. In the FTIR spectrum, the carbonyl index is defined as the ratio of the absorption peak intensity at 1726 cm −1 to that at 2913 cm −1 [19, 22 ]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…

M^{*} = \frac{1}{ε^{*}} = \frac{1}{ε^{'} - normali ε^{''}} = \frac{ε^{normal′}}{ε^{normal′ 2} + ε^{normal′ 2}} + normali \frac{ε^{'}}{ε^{' 2} + ε^{' 2}} = M^{normal′} + i M^{normal′ normal′}

M^{*} = \frac{1}{C^{*} / C_{0}} = \frac{C_{0} C^{'}}{C^{' 2} + C^{' 2}} + i \frac{C_{0} C^{normal′}}{C^{normal′ 2} + C^{normal′ normal′ 2}} = M^{'} + normali M^{''}

The modified Cole–Cole model is based on the traditional Cole–Cole model. The hopping conductivity σ ho (S/cm) caused by the complex structure of the sample should be considered [18, 19 ]. Therefore, the modified Cole–Cole model with DC conductivity, hopping conductivity, α relaxation process and β relaxation process can be obtained as shown in (3 )

ε^{*} = ε_{\infty} + \frac{χ_{s α}}{1 + {()(, j ω τ_{α})}^{n_{α}}} +

…”

Section: Experiments and Dielectric Analysis Theorymentioning

confidence: 99%

“…The modified Cole-Cole model is based on the traditional Cole-Cole model. The hopping conductivity σ ho (S/cm) caused by the complex structure of the sample should be considered [18,19]. Therefore, the modified Cole-Cole model with DC conductivity, hopping conductivity, α relaxation process and β relaxation process can be obtained as shown in (3)…”

Section: Dielectric Modulus and Modified Cole-cole Modelmentioning

confidence: 99%

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Ageing state identification and analysis of AC 500 kV XLPE submarine cable based on high‐voltage frequency dielectric response

Dai

Hao

Jian

et al. 2020

IET sci. meas. technol.

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Carrying out the insulation condition measurement and analysis is important for the safe operation of the submarine cable. In this study, the high‐voltage frequency dielectric response is used to identify the ageing state of the AC 500 kV cross‐linked polyethylene (XLPE) submarine cable. The complex capacitance and tanδ in the low‐frequency area for the new, thermal ageing, electro‐thermal ageing cable all increase with the testing voltage increased from 200 to 2000 V. It is founded that the dielectric response at high voltage is more likely to detect the ageing differences. Based on the carbonyl index and the dielectric loss of the XLPE specimens at different position of the insulation layer, the non‐uniform ageing phenomenon of the cable insulation is presented for the thermal ageing and electro‐thermal ageing cable. The loss quantity parameter and its changing behaviour with testing voltage based on the frequency dielectric response could be used to identify the ageing state. The comparison of the modified Cole–Cole model parameter under 200 and 2000 V also indicates that the higher voltage dielectric response is helpful to identify the ageing differences.

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Section: Resultsmentioning

confidence: 99%

“…

M^{*} = \frac{1}{ε^{*}} = \frac{1}{ε^{'} - normali ε^{''}} = \frac{ε^{normal′}}{ε^{normal′ 2} + ε^{normal′ 2}} + normali \frac{ε^{'}}{ε^{' 2} + ε^{' 2}} = M^{normal′} + i M^{normal′ normal′}

M^{*} = \frac{1}{C^{*} / C_{0}} = \frac{C_{0} C^{'}}{C^{' 2} + C^{' 2}} + i \frac{C_{0} C^{normal′}}{C^{normal′ 2} + C^{normal′ normal′ 2}} = M^{'} + normali M^{''}

ε^{*} = ε_{\infty} + \frac{χ_{s α}}{1 + {()(, j ω τ_{α})}^{n_{α}}} +

…”

Section: Experiments and Dielectric Analysis Theorymentioning

confidence: 99%

Section: Dielectric Modulus and Modified Cole-cole Modelmentioning

confidence: 99%

See 1 more Smart Citation

Ageing state identification and analysis of AC 500 kV XLPE submarine cable based on high‐voltage frequency dielectric response

Dai

Hao

Jian

et al. 2020

IET sci. meas. technol.

Self Cite

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show abstract

“…According to Fourier-transform infrared spectroscopy (FTIR) results, the carbonyl index can be expressed as [14]- [16] carbonyl index =…”

Section: ) Carbonyl Indexmentioning

confidence: 99%

Aging Life Evaluation of Coal Mining Flexible EPR Cables Under Multi-Stresses

et al. 2020

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As important power cables for the mining mobile equipment, such as mining shearers, ethylene propylene rubber (EPR) cables often suffer from the combining effect of various stresses on site. In order to evaluate the aging state of EPR insulation, the paper carried out the multi-stress accelerated aging test on the insulation of coal mining flexible EPR cables. The infrared spectrum, elongation at break and polarization and depolarization current of cable insulation samples were measured. The insulation state of EPR cable was evaluated by using the aging factor obtained from isothermal relaxation current. Based on the failure standard of 50% elongation at break, the life formula of EPR insulation was deduced. The experimental and analytical results show that the tiny air gap was torn to the larger air gap under the mechanical stress, which leads to the increase of oxygen infiltration and promotes the thermo-oxygen reaction. The fracture energy of EPR decreases, and mechanical aging is accelerated. Aging factor and elongation at break can indicates the deterioration degree of EPR insulation. Based on the least square method and Arrhenius equation, the service life of the insulation of coal mining flexible EPR cables is deduced. INDEX TERMS Ethylene propylene rubber, cables, thermal aging, mechanical aging, life evaluation.

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“…The most-studied property of XLPE is its dielectric loss coefficient tan(delta) [2,4,8,9,[12][13][14][15][16][17][18][19][20][21]23,27,33,34,39,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]. Authors have analyzed the effects of frequency, aging time, cable life, voltage test, and temperature on the tan(delta) distribution and value.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables

Nadolny

2022

Energies

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This article presents the electric field distribution E and dielectric losses ΔPdiel. in the insulation system of high-voltage cables. Such a system consists of inner and outer semiconductor screens and XLPE insulation. The aim of this study was to compare the values of E and ΔPdiel. between semiconductor screens and XLPE insulation. The objects of the research were high-voltage cables of 110 kV, 220 kV, 400 kV, and 500 kV. The geometrical dimensions of the cables, especially the radii of individual layers of insulation, as well as the electrical properties of the screens and XLPE, were taken from the literature. Semiconductor screens and XLPE insulation were treated as a system of three concentric cylinders. When determining the electric field distribution, both the electrical permittivity and electrical conductivity, which, in the case of semiconductor screens, play important roles, were taken into account. The obtained results prove that both the electric field distribution E and dielectric losses Pdiel. are significantly larger in XLPE insulation than in semiconductor screens. The intensity E in XLPE insulation is about four orders of magnitude greater than the intensity in semiconductor screens. Dielectric losses ΔPdiel. in XLPE insulation are about eight orders of magnitude greater than the losses occurring in semiconductor screens.

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Morphological, Structural, and Dielectric Properties of Thermally Aged AC 500 kV XLPE Submarine Cable Insulation Material and Its Deterioration Condition Assessment

Cited by 20 publications

References 33 publications

Ageing state identification and analysis of AC 500 kV XLPE submarine cable based on high‐voltage frequency dielectric response

Ageing state identification and analysis of AC 500 kV XLPE submarine cable based on high‐voltage frequency dielectric response

Aging Life Evaluation of Coal Mining Flexible EPR Cables Under Multi-Stresses

Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables

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