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

Das, Supriyo; Gupta, Nandini

doi:10.1109/tdei.2014.004467

Cited by 35 publications

(13 citation statements)

References 6 publications

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“…The interfacial region between two dielectrics is characterised by the high presence of 'traps' where space charges get confined [14]. Moreover, with ageing, the polymer chain breaks down, and the broken bonds produce new trapping sites [15]. These traps often capture electrons and confine them for the indefinite amount of time, giving rise to the phenomena of space charge.…”

Section: Introductionmentioning

confidence: 99%

Studies on the effects of moisture and ageing on charge de‐trapping properties of oil‐impregnated pressboard based on IRC measurement

Haque¹,

Dalai²,

Chatterjee³

et al. 2019

High Voltage

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The dielectric properties of oil-paper insulation degrade due to moisture ingression and ageing. This degradation significantly impacts the space charge accumulation and charge trapping behaviour in the insulation, which are vital parameters for insulation health under the high-voltage direct current environment. In this work, an improved model based on the isothermal relaxation current (IRC) has been developed to study the charge trapping behaviour of an oil pressboard under the influence of moisture and ageing. The conventional IRC model considers the total relaxation current because of charge de-trapping only. However, in the case of a composite dielectric like oil pressboard, dipolar relaxation also affects the relaxation current. In this work, a methodology has been proposed to investigate charge de-trapping behaviour of oil-pressboard insulation considering the dipole relaxation process from IRC measurements. For this purpose, frequency domain spectroscopy measurements and IRC measurements have been performed on oil-impregnated pressboard specimens carefully prepared in the laboratory having different ageing conditions and moisture contents. Results presented in this work depict that charge trapping parameters, i.e. the trap depth and trapped charge distribution are highly affected both by ageing and moisture. It was observed that ageing leads to the generation of deeper traps, while moisture mainly enhances the density of shallow traps.

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Section: Introductionmentioning

confidence: 99%

Studies on the effects of moisture and ageing on charge de‐trapping properties of oil‐impregnated pressboard based on IRC measurement

Haque¹,

Dalai²,

Chatterjee³

et al. 2019

High Voltage

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“…[18,19] Under the prolonged operating conditions of the insulating material, the accumulated space charge in bulk causes the enhancement in the local electric field, which further results in internal damage and catastrophic failure. [20,21] For the enhancement in reliability and lifetime, various research groups are attempting to develop novel insulating materials, ensuring the end product is accumulating negligible space charge. Thus, it is necessary to investigate the impact of gamma irradiation on the dielectric properties and charge trap behavior both on the surface as well as on the bulk of the Al epoxy nanocomposite material.…”

Section: Introductionmentioning

confidence: 99%

Impact of gamma‐irradiation on space charge and charge trap characteristics of Al/epoxy nanocomposites

2021

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Epoxy nano Al composites were prepared using epoxyresin, hardener, and Al nanoparticles with required proportions and irradiated with gamma rays of required dosage. Surface potential measurements and space charge studies were employed to investigate the charge trapping properties of gammairradiated specimens. The surface potential decay with DC voltage was sluggish for the gamma-aged specimens irrespective of the polarity of the applied voltage. Trap distribution characteristics showed that trapped charge carriers occupy the energy range from 0.7 to 0.9 eV and revealed the existence of deep traps for the gamma-irradiated samples. The mean lifetime and trap depth have followed the direct correlation. Space charge accumulation increased with the dosage of gamma irradiation but did not vary when space charge accumulation reached saturation. Space charge decay rate as well as saturated space charge density is higher for gamma-aged specimens vs. unaged counterparts. Deep traps inhibited the space charge decay process. Permittivity and loss tangent measurements indicate that dielectric properties were altered with nanofiller inclusions and gamma irradiation.

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“…Articles [ 9 , 10 , 11 ] present different aging and life models and their relation with space charge phenomena. The effect of aging in space charge behavior was analyzed in [ 12 ] for epoxy and polyethylene, and for XLPE HVDC cable insulation in [ 13 , 14 ]. Promising HVDC cable materials were the focus of [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

PEA Electromagnetic Distortion Reduction by Impedance Grounding and Pulsed Voltage Electrode Configurations

Escurra

Mor

Castro

et al. 2021

Sensors

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Space charges are one of the main challenges facing the constantly increasing use of extruded high voltage direct current (HVDC) cables. The Pulsed Electro-Acoustic (PEA) method is one of the most common procedures for space charge measurements of insulation. One issue with the PEA method is distortion due to the crosstalk between the applied voltage pulse and the acoustic sensor. This work analyzed two factors involved in the reduction in this distortion: the influence of the exposed semiconductor distance between the injection electrodes and PEA test cell, and the influence of adding a reactance at the grounding circuit of the PEA test cell. The interaction of these two factors with the distortion was analyzed through a series of experimental testing. Moreover, the performance regarding distortion after applying a developed coaxial injection was compared with the standard non-coaxial injection configuration. It was observed that these two factors had a direct impact on distortion and can be utilized for the reduction in distortion arising from the crosstalk of the applied pulsed voltage. The results can be utilized for the consideration of practical aspects during the construction of a PEA test setup for the measurement of full-size HVDC cables.

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

Cited by 35 publications

References 6 publications

Studies on the effects of moisture and ageing on charge de‐trapping properties of oil‐impregnated pressboard based on IRC measurement

Studies on the effects of moisture and ageing on charge de‐trapping properties of oil‐impregnated pressboard based on IRC measurement

Impact of gamma‐irradiation on space charge and charge trap characteristics of Al/epoxy nanocomposites

PEA Electromagnetic Distortion Reduction by Impedance Grounding and Pulsed Voltage Electrode Configurations

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