Terahertz-Based Insulation Delamination Defect Inspection of Vehicle Cable Terminals

Li, Shuaibing; Cao, Binglei; Cui, Yi; Kang, Yongqiang; Gao, Sheng; Li, Hongwei; Dong, Haiying

doi:10.1109/tte.2022.3200043

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…Then, it used terahertz multi-mode imaging to determine the location and estimate the geometric size of defects. Finally, it employs time-domain spectra to determine the depth of defects [97,98].…”

Section: F I G U R E 1mentioning

confidence: 99%

Review of condition monitoring and defect inspection methods for composited cable terminals

Cao

et al. 2023

High Voltage

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Composited cable terminals are critical for reliable power delivery of traditional and traction power supply systems. During its operation, the cable terminal continually undergoes complex circumstances where humidity, temperature, field strength, mechanical stress and other factors continuously change at different levels. In extreme cases, defects or even failures may occur in the cable terminals, leading to catastrophic accidents. This makes the condition monitoring and defect detection of composited cable terminals become an imperative need for the power industry. The “state‐of‐the‐art” technology of cable terminal condition assessment is focussed and a systematic review of the current research progress of cable terminal condition assessment from the operation circumstances to failure mechanisms is provided. It covers both online/offline condition monitoring methods and defects detection approaches. In addition, challenges and future research directions for cable terminal condition assessment are also addressed. It is concluded that the non‐destructive and non‐intrusive methods like terahertz imaging and ultrasonic testing, and multi‐source information fusion methods as well as the digital twin technology have been gaining popularity for cable terminal defect inspection. It is expected the presented work can provide a global field of vision for further advancement of both scholars and industrial engineers in this field.

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Section: F I G U R E 1mentioning

confidence: 99%

Review of condition monitoring and defect inspection methods for composited cable terminals

Cao

et al. 2023

High Voltage

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“…Cross-Linked Polyethylene (XLPE) has been widely used in high-voltage power supply systems because of its excellent mechanical and electrical properties [1][2][3][4]. In engineering applications, the cable core heating, the eddy current loss and dielectric loss will cause the cable insulation to heat up.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Aging on Dielectric Properties of High Voltage Cable Insulation Layer

et al. 2023

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Thermal aging is one of the main reasons for the degradation of insulation properties of high voltage cable. Dielectric properties and breakdown strength are important parameters to reflect the insulation performance of the cable insulation materials. In the work, the influence of thermal aging on dielectric and breakdown performance of the cable insulation layer was studied. Firstly, XLPE cable insulation samples were prepared and the thermal aging treatment was carried out. Secondly, the microstructure and molecular structure of XLPE samples under different thermal aging time were analyzed. The dielectric properties and breakdown characteristics of XLPE samples under different thermal aging times were characterized in macro aspect. Finally, the effects of different temperatures on the molecular microstructure of XLPE were studied. The results show that with the extension of thermal aging time, the microstructure of XLPE molecule is destroyed, the macromolecular chain is gradually cleaved, and the carbonyl absorption intensity increases. At power frequency, the breakdown strength decreases from 75.37 kV/mm to 62.18 kV/mm, the relative permittivity increases from 2.44 to 2.51, and the dielectric loss increases from 1.47 × 10−4 to 3.10 × 10−3. The free volume rate of XLPE molecules increases with the increasing temperature, and the mean square displacement gradually increases. The work has good guiding significance for the safe operation and condition assessment of high-voltage cables.

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“…As a key component of the distribution cable line, the insulation performance of distribution network cable accessories is directly related to the safe operation of the whole line. Cable accessories are the most poorly insulated parts in cable lines [1][2][3], which leads to a large proportion of cable joint faults in the distribution of fault parts in cable operation. According to statistics, the cable accessories are the most common prone to operation failure, mainly caused by: (1) Manufacturing quality defects, such as the existence of impurities inside the joints, bubbles, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Sun

et al. 2023

Coatings

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Dampness is one of the most important factors leading to the degradation of the insulation performance of cable accessories; it may easily lead to interface defects of composite insulation. In this paper, an electromagnetic field defect model of the cable composite insulation interface is established, and the effects of the defect degree and the defect type on the magnetic flux and the harmonic current are studied. The results show that the magnetic field is uniformly distributed with a decreasing trend when the cable is in good condition, and the grounding current has no obvious harmonic component. For different defects, the magnetic field changes at the defect location are notably different; for water droplets and the water film, the magnetic field distortion is obvious at the location of the defect and sheath, and for water tree defects, the distortion of the magnetic field is significant. In addition, the degree of distortion caused by the same defect at different positions is also different, and the magnetic field contrast is not obvious at different degrees of moisture exposure. The distortion of the grounding current caused by the water tree is higher than that of the water droplet and the water film, and the characteristics of the harmonic components of the grounding current caused by different defects have obvious distinctions. The type of cable defect can be judged by the proportion of harmonic components. This work can be used as a reference for the assessment of the cable insulation defect status.

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Terahertz-Based Insulation Delamination Defect Inspection of Vehicle Cable Terminals

Cited by 18 publications

References 24 publications

Review of condition monitoring and defect inspection methods for composited cable terminals

Review of condition monitoring and defect inspection methods for composited cable terminals

Influence of Thermal Aging on Dielectric Properties of High Voltage Cable Insulation Layer

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

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