Measurement of space charge distribution in alumina-filled epoxy resin for application in HVDC GIS

Noah, P.S. Mbolo; Zavattoni, L.; Agnel, S.; Notingher, P.; Laurentie, Jean-Charles; Guille, O.; Vinson, Paul; Girodet, A.

doi:10.1109/ceidp.2017.8257641

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…This accumulated space charge can alter the internal electric field, resulting in the early degradation of insulating material [ 43 , 44 , 45 , 46 ]. Noah et al have indicated that the DC electric fields above 3 kV/mm can trigger space charge accumulation in the epoxy resin [ 47 ]. The voltage polarity reversal phenomenon in general happens in HVDC transmission systems for achieving bi-directional power flow.…”

Section: Introductionmentioning

confidence: 99%

“…The water shell model proposed by Zou et al, which is based on Lewis’ [ 52 ] and Tanaka′s [ 53 ] models, explains the effect of water absorption in epoxy nanocomposites when they are exposed to humidity [ 40 ]. If the water concentration around the nanoparticles is high, percolative paths are formed through overlapping water shells that can affect the dielectric properties of epoxy nanocomposites [ 47 ]. So, it is essential to understand the influence of gamma radiation and water aging on the space charge accumulation under different electric fields and during polarity reversal.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Gamma Irradiation and Water Aging on the Space Charge Characteristics of Epoxy Micro-Nano Composites

et al. 2021

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Epoxy micro-nano composites are well-known to exhibit enhanced electrical, mechanical as well as thermal properties compared to base epoxy resin. Yet, a clear understanding need to be achieved on the long-term aging performance of the epoxy micro-nano composites. The present review article is a comprehensive study on the impact of gamma irradiation and water aging on the space charge characteristics of epoxy micro-nano composites that are applicable as insulant in high-voltage power apparatus. Ion-trapping nanoparticles, which possess good oxidation resistance and high ion trapping ability, are being chosen as nanofillers along with silica micro fillers in epoxy micro-nano composite material for improving the reliability of electrical insulation structures. The epoxy micro-nano composite specimens were subjected to gamma irradiation (4 kGy and 8 kGy) and water aging (under room temperature and at 90 °C), to analyze the effect of aging on space charge accumulation and charge decay characteristics. The mean magnitude of accumulated space charge density of epoxy micro-nano composites tends to increase with an increase in gamma irradiation dose as well as an increment in water diffusion coefficient. The mean lifetime of the space charge decay during depoling has significantly reduced after gamma irradiation and is converse with water aged specimen. Voltage polarity reversal studies have indicated that a part of homo-charge injected from electrodes remained as hetero-charge just after polarity reversal and could result in the distortion of electric field thereby increasing the electric field enhancement factor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Gamma Irradiation and Water Aging on the Space Charge Characteristics of Epoxy Micro-Nano Composites

et al. 2021

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“…[21] Noah et al have stated that application of DC electric fields above 3 kV/mm can trigger space charge injection and accumulation in the epoxy resin. [13] By taking this into account, electric field of 8 kV/mm is selected in the present study for space charge measurement using PEA technique. Figure 3 represents the space charge profiles of epoxy-Ni nanocomposites with different filler concentrations at various intervals of poling time.…”

Section: Space Charge Dynamics Of Unaged Samplesmentioning

confidence: 99%

“…One major problem with an insulating material, especially under DC voltage, is space charge accumulation causing local electric field enhancement. [12][13] Space charge accumulation is influenced by the type of filler added and the interface formed between the matrix and the filler. Electrical conductivity of a polymeric composite depends on the charge transfer conditions, which are greatly influenced by metallic fillers dispersed in the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Impact of accelerated aging of epoxy‐Ni nanocomposites on space charge variation adopting pulsed electro acoustic technique

et al. 2020

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Epoxy-Ni nanocomposites of different weight percentages are subjected to accelerated aging by water aging, thermal aging and UV irradiation to understand the influence of aging conditions on their space charge behavior. Homocharge accumulation is observed for unaged epoxy-Ni nanocomposites. The magnitude of accumulated space charge is found to be lesser in 0.5 wt% epoxy-Ni nanocomposite specimen compared to other unaged specimens. Water diffusion coefficient of epoxy-Ni nanocomposites decreased with increasing weight percentage of filler addition. Space charge accumulation tends to increase with water aging. Increment in the space charge accumulation of 0.25 wt% epoxy-Ni nanocomposite specimen is lesser compared to other water aged specimens. Exposure to thermal stress resulted in deterioration of the molecular structure of insulating material leading to an increase in trapcontrolled mobility, further leading to the reduction in space charge density with aging period. UV irradiation marginally assisted the charge transportation phenomenon, which resulted in the slight decrease of space charge density of epoxy-Ni nanocomposites after UV irradiation. Hetero-charge formation is found for all the three aging procedures. Overall, the specimen S1 reflected better space charge characteristics after being subjected to different aging conditions.

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“…In HVDC transmission systems, voltage polarity reversal phenomenon is required to achieve bi‐directional flow of power. Presence of accumulated space charge during this reversal can possibly be a serious threat for the life of insulator [14]. Montanari et al., have indicated that the space charge accumulation in presence of humidity can affect trapping sites and distribution of trap depth [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of water ageing on variation in space charge and thermo‐mechanical properties of epoxy micro‐nano composites

Babu

Ramachandran

Sarathi

et al. 2020

IET Science Measure & Tech

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Water ageing was carried out with epoxy micro-nano composite specimen. Silica micro particles and ion trapping nano particles were used as filler material in the composite specimens. Water ageing was carried out under room temperature and at 90 • C, to analyse the impact of water intake on space charge accumulation and charge decay characteristics. The threshold for space charge accumulation in epoxy specimens reduces, while the rate of space charge accumulation increases after water ageing. The initial surface potential had a marginal increment and the rate of surface potential decay has reduced significantly after water absorption. Trap distribution characteristics confirm the existence of deeper traps and charge mobility reduction in case of water aged specimens. The dynamic mechanical analysis have confirmed the viscoelastic behaviour of epoxy micro-nano composite specimens, is sensitive to the water absorption. Glass transition temperature of epoxy specimen after water absorption has shifted to lower temperatures due to plasticisation of polymer matrix and ascertained with the reduction in the activation energy. Digital image correlation method has been adopted to determine strain field distribution and displacement of the specimen under mechanical loading. Thermo gravimetric Analysis have confirmed the reduction in thermal stability resulting for water aged specimens.

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Measurement of space charge distribution in alumina-filled epoxy resin for application in HVDC GIS

Cited by 6 publications

References 3 publications

Influence of Gamma Irradiation and Water Aging on the Space Charge Characteristics of Epoxy Micro-Nano Composites

Influence of Gamma Irradiation and Water Aging on the Space Charge Characteristics of Epoxy Micro-Nano Composites

Impact of accelerated aging of epoxy‐Ni nanocomposites on space charge variation adopting pulsed electro acoustic technique

Influence of water ageing on variation in space charge and thermo‐mechanical properties of epoxy micro‐nano composites

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