Regulating the structure of crosslinked polyethylene and its application in ultra‐high voltage cables

Sun, Wu‐Ji; Liu, Xiong‐Jun; Yuan, Li‐Juan; Xiao, Han; Lu, Jian‐Mei

doi:10.1002/pen.26561

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…A reflux condenser was installed, and the heating device was turned on to heat the solvent to its boiling point while refluxing for 8 h. The metal wire with the sieve bag was carefully removed and placed in an oven at 140 • C for 3 h. After cooling the sieve bag and metal wire to room temperature, the mass of the sieve bag was measured and recorded as m 3 . The crosslinking degree was calculated using the formula shown in Equation (1).…”

Section: Crosslinking Degree Measurementmentioning

confidence: 99%

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Influence of Crosslink Density on Electrical Performance and Rheological Properties of Crosslinked Polyethylene

Di,

Qin,

Wang

et al. 2024

Polymers

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To investigate the influence of the crosslinked polyethylene (XLPE) structure on electrical performance, various analytical methods were employed to study polyethylene structures with different degrees of crosslinking. Dynamic rheological analysis was conducted to determine material shear viscosity, dynamic viscosity, storage modulus (G′), loss modulus (G″), and other rheological parameters. Additionally, the electrical performance of the material was analyzed by studying the phenomenon of space charge accumulation under direct current voltage. The results indicate that with an increasing mass fraction of the crosslinking agent, the crosslink density of crosslinked polyethylene initially increases and then decreases. When the dicumyl peroxide (DCP) content exceeds 1.0 wt.%, there is an accumulation of like-polarity space charges. The best rheological processing performance of crosslinked polyethylene is observed when the DCP content is in the range of 1.0–1.5 wt.%.

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Section: Crosslinking Degree Measurementmentioning

confidence: 99%

“…Crosslinked polyethylene (XLPE) finds widespread applications in the field of wires and cables, with continuous improvements and developments in crosslinking processes and materials [ 1 , 2 ]. The materials are now easier to process and use, exhibiting more reliable performance, and are conducive to transportation and storage.…”

Section: Introductionmentioning

confidence: 99%

Influence of Crosslink Density on Electrical Performance and Rheological Properties of Crosslinked Polyethylene

Di,

Qin,

Wang

et al. 2024

Polymers

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“…Crosslinked polyethylene (XLPE) cables are widely used in urban distribution networks [1]. However, under long-term high-temperature operating conditions, the XLPE insulation material of power cables will inevitably undergo thermal aging, leading to deterioration in electrical, mechanical, and thermal performance, and even cable failures [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Research on the Thermal Aging Characteristics of Crosslinked Polyethylene Cables Based on Polarization and Depolarization Current Measurement

Li,

Peng,

et al. 2024

Energies

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Although XLPE cables are widely used in power transmission and distribution systems, their insulating properties are susceptible to degradation due to thermal aging. In order to clarify the influence law of the thermal aging process on the structural and dielectric properties of XLPE cables, this paper investigates the thermal aging characteristics of XLPE cables by using polarization and depolarization current measurement. Results show that when the XLPE cable is aged at 140 °C, the crystallinity of the insulation layer appears to increase and then decrease. With the increase in aging time, micron-sized microvoids appear on the surface of the XLPE. At the same time, the DC conductivity and 0.1 Hz dielectric loss factor of the insulating layer increase with the aging time. The average DC conductivity increased from 2.26 × 10−16 S/m for new cables to 4.47 × 10−16 S/m after aging for 432 h, while the dielectric loss increased from 0.11% to 0.42%. The polarization characteristics of thermal-aged cables were further analyzed using the extended Debye model. Results indicate that the time constant of the third branch of the model increased significantly with increasing aging time. A correspondence between this parameter and the thermal aging time of the cable was established. Thermal aging can damage the crystalline structure of XLPE, so that the number of interfaces between the crystalline and amorphous regions of the material increases, resulting in structural damages and a decline in the dielectric properties of the cable insulation.

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“…Cross-linked polyethylene (XLPE) power cables are extensively utilized in power systems due to their lightweight nature, ease of installation, and outstanding electrical and mechanical properties [1][2][3]. However, throughout construction and operation, cables are susceptible to various external disturbances like mechanical impacts and water ingress, which can compromise their insulation performance, thereby increasing the risk of cable faults [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

High-Voltage Cable Buffer Layer Ablation Fault Identification Based on Artificial Intelligence and Frequency Domain Impedance Spectroscopy

Liu,

Ma,

Liu

et al. 2024

Sensors

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In recent years, the occurrence of high-voltage cable buffer layer ablation faults has become frequent, posing a serious threat to the safe and stable operation of cables. Failure to promptly detect and address such faults may lead to cable breakdowns, impacting the normal operation of the power system. To overcome the limitations of existing methods for identifying buffer layer ablation faults in high-voltage cables, a method for identifying buffer layer ablation faults based on frequency domain impedance spectroscopy and artificial intelligence is proposed. Firstly, based on the cable distributed parameter model and frequency domain impedance spectroscopy, a mathematical model of the input impedance of a cable containing buffer layer ablation faults is derived. Through a simulation, the input impedance spectroscopy at the first end of the cables under normal conditions, buffer layer ablation, local aging, and inductive faults is performed, enabling the identification of inductive and capacitive faults through a comparative analysis. Secondly, the frequency domain amplitude spectroscopy of the buffer layer ablation and local aging faults are used as datasets and are input into a neural network model for training and validation to identify buffer layer ablation and local aging faults. Finally, using multiple evaluation metrics to assess the neural network model validates the superiority of the MLP neural network in cable fault identification models and experimentally confirms the effectiveness of the proposed method.

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Regulating the structure of crosslinked polyethylene and its application in ultra‐high voltage cables

Cited by 3 publications

References 32 publications

Influence of Crosslink Density on Electrical Performance and Rheological Properties of Crosslinked Polyethylene

Influence of Crosslink Density on Electrical Performance and Rheological Properties of Crosslinked Polyethylene

Research on the Thermal Aging Characteristics of Crosslinked Polyethylene Cables Based on Polarization and Depolarization Current Measurement

High-Voltage Cable Buffer Layer Ablation Fault Identification Based on Artificial Intelligence and Frequency Domain Impedance Spectroscopy

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