Influence of temperature on the growth characteristics of water tree in XLPE cable

Wei, Tao; Song, Shuyong; Zhang, Wei; Bai, Rui; Weinan, Duan; Wang, Wei

doi:10.1049/joe.2018.8844

Cited by 5 publications

(3 citation statements)

References 3 publications

(3 reference statements)

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“…Therefore, the existence of water tree makes the insulation margin of the cable greatly reduced, and may become a potential hidden danger for the safe operation of the cable. 2,3 Therefore, how to improve the service life of polyethylene cables by improving the process has become the consensus of the cable industry. 4 Grafting polyolefins with stable silicone functional groups has been widely used to modify polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the water dendrites evolve into electrical dendrites to cause electric field distortion, 1 and eventually make the cable insulation breakdown. Therefore, the existence of water tree makes the insulation margin of the cable greatly reduced, and may become a potential hidden danger for the safe operation of the cable 2,3 . Therefore, how to improve the service life of polyethylene cables by improving the process has become the consensus of the cable industry 4…”

Section: Introductionmentioning

confidence: 99%

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Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene

Zhu,

He,

Sun

et al. 2024

J of Applied Polymer Sci

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In order to suppress the damage of cable insulation caused by water tree structure formed by micro‐droplets at insulation defects in low density polyethylene (LDPE) materials under AC electric field. In this paper, the siloxane group is grafted onto LDPE by melt grafting method, and different content of comonomer styrene (St) is added to improve the grafting rate of siloxane group grafted polyethylene. The effect of St on the microscopic characteristics of LDPE grafted KH570 is studied. In order to verify the accuracy and timeliness of water tree self‐healing of grafted polymer insulation materials, the microstructure characteristics of LDPE ungrafted and grafted polymer samples are analyzed by Fourier transform infrared spectroscopy, gel content test, and differential scanning calorimeter. Second, the AC dielectric properties of LDPE ungrafted and grafted polymer samples are studied by AC breakdown experiment and space charge test. Finally, the water tree length, micropore defects, and self‐healing of the samples are observed by optical microscopy and polarization and depolarization current method, and the changes of chemical composition in the water tree area before and after aging are analyzed by infrared spectroscopy. The principle and mechanism of repairing water tree defects with grafted monomers are explained. This paper not only combines the previous research results of self‐healing materials, but also provides a new method for the preparation process of LDPE grafted polymer, which has a good research prospect in practical application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene

Zhu,

He,

Sun

et al. 2024

J of Applied Polymer Sci

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show abstract

“…Long-term partial discharge activity of XLPE cables under electrical and thermal stresses may lead to a discharge channel appearing in the form of electrical trees or water trees which conduct current across the voltage gap on insulators and metals leading to insulation failure. Many researchers have investigated this phenomenon and explored its temperature dependence [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

¹ H NMR tests on damaged and undamaged XLPE and SiR samples

et al. 2019

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Cross-linked polyethylene (XLPE) and silicone rubber (SiR) samples were subjected to a high-voltage AC stress plane-plane configuration and inclined plane test, respectively. The voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several hours. Selected stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance (NMR) spectroscopy. Specifically, 1 H NMR spin-lattice (T 1) and spin-spin (T 2) relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR samples. Preliminary results show that there may be a moderate increase in the T 1 and T 2 values of the damaged samples in comparison with the undamaged ones. This raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.

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Harmonic-based thermal analysis of electric arc furnace's power cables considering even current harmonics, forced convection, operational scheduling, and environmental conditions

Jamali-Abnavi

Hashemi‐Dezaki

Ahmadi

et al. 2021

International Journal of Thermal Sciences

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Influence of temperature on the growth characteristics of water tree in XLPE cable

Cited by 5 publications

References 3 publications

Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene

Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene

¹ H NMR tests on damaged and undamaged XLPE and SiR samples

Harmonic-based thermal analysis of electric arc furnace's power cables considering even current harmonics, forced convection, operational scheduling, and environmental conditions

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Influence of temperature on the growth characteristics of water tree in XLPE cable

Cited by 5 publications

References 3 publications

Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene

Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene

1 H NMR tests on damaged and undamaged XLPE and SiR samples

Harmonic-based thermal analysis of electric arc furnace's power cables considering even current harmonics, forced convection, operational scheduling, and environmental conditions

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¹ H NMR tests on damaged and undamaged XLPE and SiR samples