Charge trapping and transport phenomenon in aged and unaged epoxy resin and polyethylene

Das, Supriyo; Gupta, Nandini

doi:10.1002/etep.1876

Cited by 16 publications

(26 citation statements)

References 12 publications

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“…To investigate the effect of thermal ageing on charge trapping and accumulation, both epoxy and polyethylene samples are heated continuously in a temperature-controlled oven in the following manner, (1) 15 days at 100 0 C, (2) 30 days at 100 0 C. The interfaces between two different materials (epoxy and polyethylene) as well at a discontinuity in an otherwise homogeneous single material sample are studied. Barriers in thermally aged and unaged composites are also studied.…”

Section: Sample Preparation and Experimental Methodologymentioning

confidence: 99%

“…To better understand the effect of aged layers in composites, we have created samples, wherein one or both layers are aged. The composite samples are energised for 10,000 s and depolarised for 20,000 s. The abbreviations used to represent the different kinds of aged composites used in the experiments are given in Table 1.In this work, epoxy (EP) used is Bisphenol-A, whereas commercially available Polyethylene (PE) is used [1]. The thicknesses of the homogeneous epoxy and polyethyelene samples are 0.3 and 0.2 mm respectively.…”

Section: Sample Preparation and Experimental Methodologymentioning

confidence: 99%

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Effect of ageing on space charge distribution in homogeneous and composite dielectrics

Das

Gupta

2015

IEEE Trans. Dielect. Electr. Insul.

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Homogeneous and composite polymeric insulating systems under operation are subjected to various stresses, including thermal, causing degradation and deterioration to the material. Ageing increases charge accumulation within the volume of the material. In this paper, charge trapping and transport phenomena in thermally aged homogeneous epoxy resin and polyethylene are studied. Pulsed Electro-Acoustic (PEA) measurements are performed to obtain the spatial distribution of charge within the volume of a dielectric. Apart from the space charge behaviour at dielectric -electrode interfaces, the behaviour of interfacial charge at dielectric -dielectric interfaces is also investigated. To this end, composite dielectrics are created with epoxy and polyethylene as constituents. The effect of thermal ageing on the interfacial charge evolution and accumulation in dielectrics with interfaces is investigated. Due to thermal ageing of homogeneous materials, charge is seen to accumulate within the bulk of the material, and not only at the interfaces. In aged composites, interfacial charge evolves at the interfaces, as well as within the bulk of the material. However, space charge measurements in aged materials with interfaces require special care, as signals reflected from space charge sites within the volume of the aged dielectrics tend to distort the real signal.

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Section: Sample Preparation and Experimental Methodologymentioning

confidence: 99%

Section: Sample Preparation and Experimental Methodologymentioning

confidence: 99%

Effect of ageing on space charge distribution in homogeneous and composite dielectrics

Das

Gupta

2015

IEEE Trans. Dielect. Electr. Insul.

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“…It is also observed that negative polarity charge accumulates in PE. FTIR results reported in [5] show change in chemical composition due to ageing. Therefore the accumulation of charge in the bulk may be due to change in the material structure and composition.…”

Section: IIImentioning

confidence: 88%

“…Therefore it can be said that in polyethylene charge is trapped at deeper levels compared to epoxy. Due to the semi -crystalline structure of polyethylene additional trap sites for charge trapping present at the interface of the crystalline -amorphous boundaries [5], thereby increasing the density of traps and enhances charge trapping. It is reported in [8], that difference in structural properties cause variation in trap depth and trap controlled mobility.…”

Section: IIImentioning

confidence: 99%

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Assessment of space charge based on PEA measurement

Das

Gupta

2015

2015 1st Conference on Power, Dielectric and Energy Management at NERIST (ICPDEN)

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Accumulation of charge within a polymericinsulating material under DC field stresses is a matter of concern. Charge accumulated within the polymeric insulating material depends on the composition and structural properties of the material. In this work, spatial distribution of charge trapped within the volume of the dielectric material is measured using the Pulsed Electroacoustic technique (PEA). Space charge in unaged and thermally aged polyethylene is studied. Thermal ageing is carried out for different conditions and different periods. Space charge distribution for these variously aged samples is studied. Trap depth and trap controlled mobility is estimated from space charge measurement. Trap depth and mobility is seen to vary in unaged and aged materials and therefore can be used as ageing markers. Also the difference in polyethylene and epoxy is studied.

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Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective

Liu

Xie

et al. 2022

Adv Elect Materials

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temperature and complex electric field conditions. [1][2][3] Epoxy resin (EP) is a class of polymer oligomers containing two or more epoxide groups based on organic compounds (e.g., aliphatic, alicyclic, and aromatic). As a prepolymer, EP shows excellent performance after its reaction with a curing agent to form an insoluble polymer with a 3D network structure. EP has desirable insulating characteristics, [4][5][6][7] heat resistance, [8] high mechanical strength, [9] low shrinkage, [10] chemical stability, and adhesive properties, which originate from its compact structure and tunable functional groups. The above mentioned outstanding performances, along with characteristics of easy processing and formula design flexibility, enable the extensive use of EP-based materials in power equipment and electronic devices [11] (Figure 1), including bar insulation and impregnating varnish in transformers, main insulation in dry-type bushings and wall bushings, insulator in gas-insulated switchgear (GIS) and gas-insulated transmission line (GIL), epoxy molding compound for integrated circuit (IC) packaging. It is noteworthy that EPs typically possess lower glass transition temperature (T g ) compared to other high-T g dielectric polymer substitutes used in microelectronic systems such as benzocyclobutene, [12] polyimide (PI), [13] and maleimide. [14] Besides high T g , high thermal conductivity and low coefficient of thermal expansion of EPs are always desired for their industrial applications, especially from an electronic packaging perspective. To date, considerable efforts have been made to improve the heat endurance and heat dissipation capabilities of EP-based dielectric materials by inorganic particle doping [15][16][17][18][19][20][21][22][23][24] and chemical modification. [25][26][27] Furthermore, EP is also an indispensable adhesive that is extensively used in power equipment. [28][29][30][31][32] Yet, potential reliability hazards may exist during the operation of power equipment and electronic devices, especially at high temperatures and under high voltage direct current (HVDC) application, one of which is the space charge accumulation in EP-based dielectric materials. [29,30,33,34] The accumulated space charge may cause deterioration/aging and even partial discharge or dielectric breakdown of dielectric materials. [35][36][37][38][39][40] Specifically, the extensive application of EP-based dielectric materials in HVDC transmission projects eagerly calls for relevant studies on the space charge behavior Epoxy-based dielectrics are extensively used in grid-connected energy systems and modern microelectronics as electrical insulation, adhesive, and packaging components. However, space charge accumulation in epoxy-based dielectrics is a foremost factor threatening device stability and lifespan, especially under conditions of high voltage direct current and high temperatures during long-term operation, and thus are investigated systematically. This article reviews the state-of-the-art progress in understanding and r...

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Charge trapping and transport phenomenon in aged and unaged epoxy resin and polyethylene

Cited by 16 publications

References 12 publications

Effect of ageing on space charge distribution in homogeneous and composite dielectrics

Effect of ageing on space charge distribution in homogeneous and composite dielectrics

Assessment of space charge based on PEA measurement

Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective

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