Intelligent model prediction of fluctuant increase of maximum electric field in XLPE insulation using long short‐term memory network algorithm

Wang, Weiwang; Lv, Jiaju; Feng, Yong; Li, Xinyuan; Li, Shengtao

doi:10.1049/hve2.12242

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…A typical PEA space charge test platform is illustrated in Figure 1 . Previous studies have elucidated the configuration of the PEA system [ 22 , 23 ]. The electric stress is imparted by a high-voltage (HV) amplifier, which is connected to a high-voltage electrode via a series resistance.…”

Section: Methodsmentioning

confidence: 99%

Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation

Yang,

Li,

et al. 2024

Polymers

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The aging of cable insulation presents a significant threat to the safe operation of cables, with space charge serving as a crucial factor influencing cable insulation degradation. However, the characteristics related to space charge and conduction current behavior during thermal aging remain unclear. This study focused on the thermal aging of cross-linked polyethylene (XLPE) material and utilizes a combined pulse electro-acoustic (PEA) and conduction current testing system to analyze the space charge and conduction current characteristics in the sample under varying electric fields and temperatures. The average charge density, short-circuit residual electric field, electric field distortion rate, and conduction current were studied. The findings indicate that the space charge in the samples following thermal aging is predominantly governed by the injected charge. The amorphous region of XLPE decreases, while the cross-linking degree increases after aging, thereby facilitating charge carrier migration within the sample and reducing the generation of charge carriers through thermal pyrolysis. The minimum temperature required for charge injection is reduced by thermal aging. Furthermore, modifications in conduction current, residual electric field, and average charge density indicate that thermal aging has the potential to alter the microstructure and trap characteristics of XLPE. This study provides empirical evidence to elucidate the underlying mechanism of cable insulation aging.

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Section: Methodsmentioning

confidence: 99%

Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation

Yang,

Li,

et al. 2024

Polymers

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“…The measured signal provides an image of the charge distribution over the whole sample, the position and time are connected by the speed of sound. The electrical signal obtained can be analysed and processed to obtain results for the space charge distribution along the sample thickness direction [31,32]. At the same time, the simultaneous application of the optical pulses introduces the amount of distortion on the measured signal.…”

Section: Measuring System Of the Pea Methods With Optical Excitationmentioning

confidence: 99%

Development of a novel signal restoration algorithm to eliminate the distorted components in space charge measurement excited by femtosecond laser irradiation

Qi,

Ren,

Gao

et al. 2024

High Voltage

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For the space charge measurement method with optical excitation for electrical insulation, the distortion of the excitation laser on the measurement signal and the accumulation of space charge have not been discussed before. Both experiment and simulation results show that three types of distorted components introduced by optical excitation can lead to distortion of the upper interface signal. Further, the factors causing distortion of the measured signal and the formation mechanism are analysed. A virtual electrode potential compensation method and a distorted component extraction method are proposed. Meanwhile, an attenuation restoration and charge conversion correction factor is introduced, leading to a novel signal processing algorithm adapted to space charge optical measurement methods. Compared with the traditional algorithm, the novel algorithm has an error of less than 1% in the calculation of charge and electric field strength, with an increase in accuracy of 47.7% and 9.81%, respectively. By applying the novel restoration algorithm, the comparison shows that the space charge accumulation does not change significantly under laser irradiation, verifying the reliability of the optical excitation. The given algorithm can provide a theoretical and technical foundation for the realisation of the optical measurement method for space charge.

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“…During cable laying, due to the limitations of the laying environment, the cable will inevitably bend. Long-term exposure to external mechanical stress can lead to problems such as sheath rupture and insulation deformation, causing cable failures [3,4]. Moreover, external mechanical stress can damage the aggregated structure of the insulation material, accelerate the growth of electrical trees in the insulation material, and seriously threaten the reliability of cable operation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of nucleating agents on the electrical properties of cross‐linked polyethylene under tensile stress

Xing,

Liu,

et al. 2023

High Voltage

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During the operation of high‐voltage cables, external stress and residual stress can affect the aggregated structure of insulating materials and lead to significant deterioration in their electrical performance. To investigate the evolution characteristics of the electrical properties of cross‐linked polyethylene (XLPE) under mechanical stress, this paper explains the relationship between the aggregated structure of XLPE and its electrical properties and proposes a method for improving insulation performance under mechanical stress. The results show that metallocene polyethylene used as a nucleating agent can promote crystallisation through heterogeneous nucleation and increase Young's modulus by non‐uniform nucleation, increasing crystallinity and reducing interplanar spacing, resulting in more complete crystal forms and reduced damage to the aggregated structure during the tensile process. After nucleating agent modification, the XLPE crystallisation becomes more uniform, and interfacial adhesion forces increase. The weakened interface damage process between the amorphous and crystalline regions under tensile stress effectively inhibits the process of molecular chain polarisation turning and reduces trap density. The modified XLPE crystal structure shows a tendency towards densification and enhanced molecular chain interactions, which can reduce the damage to the aggregated structure under tensile stress, while the reduced free volume inside the material and the shortened average free path of carriers can weaken the damage of high‐energy electrons to molecular chains, thereby inhibiting the process of electrical tree degradation. The results show that nucleating agents have great potential for maintaining the stable operation of XLPE cables under mechanical stress.

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Intelligent model prediction of fluctuant increase of maximum electric field in XLPE insulation using long short‐term memory network algorithm

Cited by 5 publications

References 28 publications

Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation

Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation

Development of a novel signal restoration algorithm to eliminate the distorted components in space charge measurement excited by femtosecond laser irradiation

Effect of nucleating agents on the electrical properties of cross‐linked polyethylene under tensile stress

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