Environmental Effects on HV Dielectric Materials and Related Sensing Technologies

Bojovschi, A.; Quoc, Thai Vu; Trung, Huy Nguyen; Quang, Dung Trinh; Le, Tu C.

doi:10.3390/app9050856

Cited by 13 publications

(7 citation statements)

References 70 publications

(62 reference statements)

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“…Before the experiment was carried out, polymer insulators were placed in an open place, so they could be exposed to direct sunlight or rain. The purpose of the insulator being placed in the open was to condition the insulator to experience natural aging by exposing the insulator to heat from sunlight and water from rainwater [21]. The polymer insulator was placed in the open for 13 weeks.…”

Section: Natural Aging Insulatormentioning

confidence: 99%

Effect of Seawater and Fly Ash Contaminants on Insulator Surfaces Made of Polymer Based on Finite Element Method

Negara¹,

Hernanda²,

Asfani³

et al. 2021

Energies

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Polymer is an insulating substance that has become increasingly popular in recent years due to its benefits. Light density, superior dielectric and thermal properties, and water-resistant or hydrophobic properties are only a few of the benefits. The presence of impurities or pollutants on the insulator’s surface lowers its dielectric capacity, which can lead to current leakage. The influence of seawater and fly ash pollutants on the distribution of the electric field and the current density of the insulator was simulated in this study. The finite element method was used to execute the simulation (FEM). Polymer insulators are subjected to testing in order to gather current leakage statistics. The tested insulator is exposed to seawater pollution, which varies depending on the equivalent salt density deposit value (ESDD). The pollutant insulator for fly ash varies depending on the value of non-soluble deposit density (NSDD). The existence of a layer of pollutants increased the value of the electric field and the value of the surface current density, according to the findings. Both in simulation and testing, the ESDD value of seawater pollutants and the NSDD value of fly ash contaminants influenced the value of the leakage current that flowed. The greater the ESDD and NSDD values are, the bigger the leakage current will be.

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Section: Natural Aging Insulatormentioning

confidence: 99%

Effect of Seawater and Fly Ash Contaminants on Insulator Surfaces Made of Polymer Based on Finite Element Method

Negara¹,

Hernanda²,

Asfani³

et al. 2021

Energies

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“…As a remarkable fraction (>40%) of an atmospheric aerosol is composed of watersoluble compounds [12,13], a direct consequence is its hygroscopicity, such as in saline deposit layers, which causes an aerosol to pass into a liquid phase [14][15][16]. This phenomenon happens when soluble pollution species dissociate in ions, acquiring conductive characteristics.…”

Section: Introductionmentioning

confidence: 99%

On the Chemical Composition and Hygroscopicity of Aerosols Deposited on the Insulators of Italian Power Lines

Gini,

Balzarini,

Pirovano

et al. 2023

Applied Sciences

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The reliability of the national power grid is a key issue in modern society. Atmospheric aerosols are the main cause of the reduction in the performance of insulators and the increase in the possibility of flashovers, resulting in power line failures. Under high ambient humidity, the water-soluble compounds of atmospheric aerosols collected on the insulators’ surface can dissociate in ions and form a conductive layer, which may lead to flashover events. With a view to investigating the processes that drive these phenomena, the chemical composition of aerosol deposits on insulators in Italy was determined by ion chromatography analysis and thermos-optical and X-ray techniques. In addition, a synthetic aerosol with the same analyzed chemical composition was generated in a laboratory and deposited on PTFE filters and glass specimens allowing us to determine the deliquescence and crystallization relative humidity and the conductive effect in an aerosol exposure chamber. The results evidenced the presence of a hazardous inorganic ion layer, which generates a sharp phase transition of the aerosol deposit as a function of the ambient relative humidity; this layer poses a dangerous threat to the reliability of the power grid, increasing the probability of flashover events where the conductive layer facilitates the flow of electrical current across the insulator surface, potentially causing power outages or damage to the power lines.

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“…3 Despite the advantages of the use of polymeric insulators, there are many concerns related to them, such as the diversity of polymeric materials and additives and the reliable prediction of the lifetime of these insulators, among others. 4,5 Aging studies are extremely important for the development of more resistant materials, as well as additives, for increasing the lifetime of polymers. 6 The use of accelerated aging methods makes possible the prediction of material behavior and their lifetime, at short periods of exposure.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accelerated aging and characterization of HDPE pin type insulators (15 kV)

Erbetta

Silva

Freitas

et al. 2021

Polymers and Polymer Composites

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The study of the behavior of polymeric material used for insulators in the electrical system is extremely important in order to evaluate their lifetime as well as their performance when exposed to different environmental conditions. In the present work, the behavior of high-density polyethylene (HDPE) pin type insulators (15 kV), under accelerated aging conditions, was studied. Samples were exposed to aging, for 200 h, 1000 h, and 2000 h, in accelerated weathering chambers, according to two different methods. In Method 1, the parameters were established based on natural aging in location conditions, and in Method 2, ASTM G155 standard parameters were used. All samples were characterized by rheometry, Fourier-transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). The accelerated aging conditions, used in Methods 1 and 2, affected the aging of HDPE pin type insulators samples differently, the changes being more intense in Method 1.

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Environmental Effects on HV Dielectric Materials and Related Sensing Technologies

Cited by 13 publications

References 70 publications

Effect of Seawater and Fly Ash Contaminants on Insulator Surfaces Made of Polymer Based on Finite Element Method

Effect of Seawater and Fly Ash Contaminants on Insulator Surfaces Made of Polymer Based on Finite Element Method

On the Chemical Composition and Hygroscopicity of Aerosols Deposited on the Insulators of Italian Power Lines

Accelerated aging and characterization of HDPE pin type insulators (15 kV)

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