Response functions and after-effect in dielectrics

Berleze, S.L.M.; Robert, Renê

doi:10.1109/tdei.2003.1219651

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…a) RVM and FDS are used to make an estimation of the water content of the paper in transformers based on laboratory measurements [13] [18]. For correct estimation of water content in oil-filled apparatus, the method needs the constructional details to quantify the volume and arrangement of each used dielectric material.…”

Section: Objectivesmentioning

confidence: 99%

“…The dielectric response function was proposed by Jonscher [18] [37] after observing two types of polarization processes in many dielectrics.…”

Section: Jonscher's Response Function [18]mentioning

confidence: 99%

“…It is found that that the relaxation behavior in lower frequency [1] can be used to evaluate the moisture content and the aging condition of the insulation system. In addition by laboratory studies, it is found that the properties of individual dielectric and its geometrical arrangement can control the dielectric responses in different frequency ranges [18]. The dominant influence of pressboard for a composite insulation system of a transformer is mainly in the frequency range below 1 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…4 Oommen's moisture equilibrium curves on oil and paper system[18] Insulating oils under abnormal electrical and thermal stresses break down to liberate small quantities of gases. The composition of these gases is dependent upon the type of fault[23].…”

mentioning

confidence: 99%

“…17 Variation of R p , C p and x in OIP with new and added impurity oil,18 Variation of e' and e" in OIP with new and added impurity oil, frequency and temperature4.3 Simulation studies in frequency domainTo explain the results of the measurements, mathematical model is a useful method to predict the responses. This mathematical model must be able to predict the relaxation responses with equilibrium time, temperature and oxidized impurities.…”

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confidence: 99%

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Relaxation studies on oil, pressboard and oil impregnated pressboard

Cao¹

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for their kind assistance and necessary support. I acknowledge the help given by Mr. Lim Thiam Fook, Executive Engineer in Electrical Maintenance Section of PowerSenoko. I thank him for the active discussion. I appreciate the School of EEE, Nanyang Technological University for awarding me a research scholarship for 3 years and for providing the necessary facilities to carry out this research work. I also appreciate PowerSenoko for providing me some top up scholarship for 3 years. Last but not least, I acknowledge my wife Zhang Huiwen and my daughter Cao Shuya, for their help, patience and continued moral support in completing this research work.

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Section: Objectivesmentioning

confidence: 99%

“…The dielectric response function was proposed by Jonscher [18] [37] after observing two types of polarization processes in many dielectrics.…”

Section: Jonscher's Response Function [18]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Relaxation studies on oil, pressboard and oil impregnated pressboard

Cao¹

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Response of an Insulating Material to an Electric Charge

Molinié¹

2013

Dielectric Materials for Electrical Engineering

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Dielectric relaxation in open circuit: Theory, simulations, and some experiments

Molinié

2023

Journal of Applied Physics

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Static charge on insulating material surfaces may be a source of nuisance and an operational requirement in many devices. It induces a potential that evolves with time due to conduction and polarization processes in the dielectric. Here, we analyze, from a theoretical and experimental point of view, the response of an insulator subjected to a charging pulse, within the frame of linear system theory. The surface potential decay and the return voltage after a brief neutralization, which can be easily measured using an electrostatic probe, usually follow time power laws. We consider here a dielectric following the classical Cole–Cole response function in the frequency domain and derive an exact analytic formula for the potential decay, which involves a Mittag–Leffler function. The relationship between the potential decay and the absorption current when a constant voltage is applied on the dielectric is also analyzed. Experiments on several common insulating materials are analyzed according to this theory, using a numerical simulation with a two-cell model. Return voltage measurements are used to check which materials behave according to the linear model. We underline that an equivalent circuit using constant-phase elements, corresponding to several cells following the Cole–Cole response, can also represent dipolar motions in the dielectric as charge hopping between energy-distributed traps.

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Response functions and after-effect in dielectrics

Cited by 7 publications

References 4 publications

Relaxation studies on oil, pressboard and oil impregnated pressboard

Relaxation studies on oil, pressboard and oil impregnated pressboard

Response of an Insulating Material to an Electric Charge

Dielectric relaxation in open circuit: Theory, simulations, and some experiments

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