Detection of Defect Presence inside the Insulation of Cable Accessories through Changes in Cable Capacitance

Batalović, Mirza; Zildzo, Hamid; Matoruga, Halid; Matoruga, Mirza; Berberović, Sead

doi:10.1109/icat47117.2019.8938874

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…Numerous researchers have discovered that minute flaws at the silicone rubber-mandrel contact can cause the insulator to fail (Armentrout et al, 2003;Wang et al, 2014;Zheng and Gao, 2019). Tiny defects in a cable might lead it to crack and eventually fail (Zhang et al, 2018;Batalović et al, 2019). Tiny defects in insulating cardboard will cause the risk of overheating and local breakdown of the transformer (Zhang Raw thermal images of silicon rubber plate specimen (A) The 100th frame of raw thermal images sequence, (B) The 275th frame of raw thermal images sequence (Liu et al, 2017).…”

Section: Harms Of Tiny Defectsmentioning

confidence: 99%

A review of non-destructive methods for the detection tiny defects within organic insulating materials

et al. 2022

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In recent years, solid organic materials such as silicone rubber and epoxy resin have been widely used in electrical equipment due to their excellent insulation properties. However, as a result of manufacturing and design flaws as well as aging issues during operation, the insulating materials in the linked state no longer fit tightly and tiny structural defects (defect size less than 10 mm) develop, such as debonding at the composite interface, pores or cracks within the insulating material, etc. Tiny defects are prone to partial discharges and breakdowns, compromising the safety of high-voltage power equipment, particularly when subjected to strong electric fields. Therefore, it is necessary to carry out non-destructive testing (NDT) for such tiny defects. Such defects are small in size, easily buried in the material, and even some are wrapped in metal, which in turn requires very high detection accuracy, but traditional methods are difficult to achieve, so NDT technologies for tiny defects within insulating materials have become a research hotspot in the field of electric power in recent years. This paper firstly introduces the sources of tiny defects in solid organic insulating materials for electrical equipment. Secondly, the harm caused by structural defects is elaborated. Finally, emerging NDT methods and their advantages and limitations in defect detection are described in detail. The review aims to provide the reader with a comprehensive overview of most of the NDT techniques used in the detection of tiny defects within solid organic insulating materials for electrical equipment and their most salient features.

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Section: Harms Of Tiny Defectsmentioning

confidence: 99%

A review of non-destructive methods for the detection tiny defects within organic insulating materials

et al. 2022

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“…In recent years, with the development of urban modernization, the unit capacity has been increasing, and the share of power cables in urban power supply has increased [1]. In some urban areas, overhead transmission lines have been gradually replaced by laying cables.…”

Section: Introductionmentioning

confidence: 99%

Research on Simulation Methods of Electric Field Intensity on Surface of 10 kV Cable Joint

Zhang¹,

Xiong²,

Wu³

et al. 2020

EPE

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The electric field intensity (EFI) is important characteristic quantity for evaluating the internal insulation state of cable joints. Based on finite element method, this paper proposes two EFI research methods, field-circuit coupling method and equivalent circuit method. The average EFI of the inner surface of the outer semi-conducting shield can be calculated from the current in the measuring circuit. The relative error between these two methods is about 15%, which roughly proves the consistency of the two methods. Further practical application research enables online monitoring of cable joints.

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A Review: Application of Terahertz Nondestructive Testing Technology in Electrical Insulation Materials

Guo¹,

Xu²,

Cai³

et al. 2022

IEEE Access

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As the voltage level of the grid continuously rises, more and more new insulating materials with better performance are put into use. Nevertheless, air gaps often appear in insulating materials due to poor material quality, structural design flaws, etc. High-field-strength air gaps will produce partial discharge or even breakdown, resulting in electrical equipment failure. In addition, during operation, organic insulating materials are simultaneously exposed to high temperatures, mechanical stress, electrical stress, and moisture. Consequently, aging is inevitable. The aging of insulation materials is the root cause of the reduced insulation properties of the degradation of the insulation properties of electrical equipment in long-term operation. In order to improve the safety performance of power equipment and assure the safety of power grids, the detection and identification of internal structural defects and aging states of insulating materials have always been hot issues in related fields. However, structural defects inside the insulation materials used in power equipment, which are tiny (microns to millimeters), are exceedingly challenging to detect. While there are various destructive methods for detecting the aging status, non-destructive in-line inspection methods are still less commonly reported. In recent years, some scholars have begun to try to use terahertz spectroscopy to detect insulating materials. Numerous scholars have discovered that terahertz spectroscopy can not only detect structural defects inside insulating materials but can also detect nondestructive testing on the degree of material aging and even the type of material, which has excellent engineering value and promotion prospects. In order to help relevant researchers understand the application of this emerging technology in the field of insulating materials, this paper reviews the basic principles of terahertz detection and its applications in air gap detection, moisture detection, and aging analysis of insulating materials. Existing problems and future development directions are discussed.

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Detection of Defect Presence inside the Insulation of Cable Accessories through Changes in Cable Capacitance

Cited by 4 publications

References 1 publication

A review of non-destructive methods for the detection tiny defects within organic insulating materials

A review of non-destructive methods for the detection tiny defects within organic insulating materials

Research on Simulation Methods of Electric Field Intensity on Surface of 10 kV Cable Joint

A Review: Application of Terahertz Nondestructive Testing Technology in Electrical Insulation Materials

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