Study of corona degradation of polymeric insulating samples using high dynamic range imaging technique

D, Shakthi Prasad; Reddy, B. Subba

doi:10.1109/tdei.2017.006420

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…Other secondary factors contributing to failure are the polar groups originating from the surface layer cracking. This may lead to the surface degradation of polymeric insulators [ 81 ]. Surface cracks may modify the mechanical and electrical properties of these insulators [ 82 ].…”

Section: Role Of Fillers On Important Properties Of Polymeric Insulatorsmentioning

confidence: 99%

Review of the Performance of High-Voltage Composite Insulators

Saleem

Akbar

2022

Polymers

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In the present literature survey, we focused on the performance of polymeric materials encompassing silicone rubber (SiR), ethylene propylene diene monomer (EPDM) and epoxy resins loaded with micro, nano, and micro/nano hybrid fillers. These insulators are termed as composite insulators. The scope of the added fillers/additives was limited to the synthetic inorganic family. Special attention was directed to understanding the effect of fillers on the improvement of the thermal conductivity, dielectric strength, mechanical strength, corona discharge resistance, and tracking and erosion resistance performance of polymeric materials for use as high-voltage transmission line insulators. The survey showed that synthetic inorganic fillers, which include silica (SiO2) and hexagonal boron nitride (h-BN), are potential fillers to improve insulation performance of high-voltage insulators. Furthermore, nano and micro/nano filled composites performed better due to the better interaction between the filler and polymer matrix as compared to their only micro- or nano filled counterparts. Finally, some aspects requiring future work to further exploit fillers are identified and discussed.

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Section: Role Of Fillers On Important Properties Of Polymeric Insulatorsmentioning

confidence: 99%

Review of the Performance of High-Voltage Composite Insulators

Saleem

Akbar

2022

Polymers

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“…Due to the constant development of digital cameras, the effective number of pixels in a visible image is usually much greater than that found in high-speed, UV, or infrared cameras, and therefore, the image provides more spatial information of the discharge [ 97 ]. Different authors have used commercially available CMOS sensors intended for visible photography to detect corona emissions and locate the discharge points [ 65 , 98 ] because CMOS sensors are known to be sensitive in the visible and UV regions. In [ 32 ], a Sony IMX219 miniature digital sensor was used to detect a visual corona effect, whose spectral response could be found in [ 99 ].…”

Section: Ultraviolet (Uv) and Visible Imaging Applied To Corona Disch...mentioning

confidence: 99%

Application of Image Sensors to Detect and Locate Electrical Discharges: A Review

Ruiz

2022

Sensors

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Today, there are many attempts to introduce the Internet of Things (IoT) in high-voltage systems, where partial discharges are a focus of concern since they degrade the insulation. The idea is to detect such discharges at a very early stage so that corrective actions can be taken before major damage is produced. Electronic image sensors are traditionally based on charge-coupled devices (CCDs) and, next, on complementary metal oxide semiconductor (CMOS) devices. This paper performs a review and analysis of state-of-the-art image sensors for detecting, locating, and quantifying partial discharges in insulation systems and, in particular, corona discharges since it is an area with an important potential for expansion due to the important consequences of discharges and the complexity of their detection. The paper also discusses the recent progress, as well as the research needs and the challenges to be faced, in applying image sensors in this area. Although many of the cited research works focused on high-voltage applications, partial discharges can also occur in medium- and low-voltage applications. Thus, the potential applications that could potentially benefit from the introduction of image sensors to detect electrical discharges include power substations, buried power cables, overhead power lines, and automotive applications, among others.

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“…It is well known that the presence of water droplets on the hydrophobic surface will distort the electric field along its surface, which will favor partial discharges [10][11][12]. By observing two salt droplets that were placed under high tangential electric fields with infrared thermography and ultrahigh-speed photography, it was found that the discharge inception voltages and the temperature variations were closely related to the ionization degree of the salt and the interfacial electrochemical reactions near the electrodes [10].…”

Section: Introductionmentioning

confidence: 99%

Flashover characteristics of a hydrophobic surface covered by water

Cao¹,

Shao²,

Wu³

et al. 2020

J. Phys. D: Appl. Phys.

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Due to their hydrophobic properties, composite insulators have excellent anti-pollution flashover performance and have been widely used in power systems. For a better understanding of the flashover characteristics of a hydrophobic surface at wet conditions, the hydrophobic surface is covered with water droplets and water film, respectively, in this paper. The initiation and development of partial arc are observed by an ultrahigh-speed camera and the leakage current is also recorded. It is found that there exists a critical water proportion for a given dry band length and water volume conductivity. Beyond this water proportion, the partial arc does not necessarily lead to the flashover. On the contrary, flashover will take place right after the occurrence of partial arc. Furthermore, it is also found that when the water proportion is below the critical water proportion, the flashover voltage is barely related to the volume conductivity and the flashover voltage generally decreases with the increase of water volume and water droplet number. The results obtained are of great significance to understand the flashover process of hydrophobic surfaces.

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Study of corona degradation of polymeric insulating samples using high dynamic range imaging technique

Cited by 7 publications

References 26 publications

Review of the Performance of High-Voltage Composite Insulators

Review of the Performance of High-Voltage Composite Insulators

Application of Image Sensors to Detect and Locate Electrical Discharges: A Review

Flashover characteristics of a hydrophobic surface covered by water

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