Dielectric response and space charge in epoxy impregnated paper composite laminates

Wang, Qingyu; Peng, Zongren; Dodd, Stephen J.; Dissado, L.A.; Chalashkanov, N. M.

doi:10.1109/tdei.2019.008147

Cited by 17 publications

(16 citation statements)

References 20 publications

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“…To ensure the accuracy of the thermal field, fluid field, and electric field calculations, we conducted further analysis using thermodynamic and electrical parameters mentioned in the literature [19][20][21] as shown in Tables 3 and 4. The unit of temperature here is K.…”

Section: Thermodynamic and Electrical Parametersmentioning

confidence: 99%

Investigation on distribution of electro‐thermal coupled field and improved design of ±1100 kV converter valve‐side bushing

Liu

Chen

Liang

et al. 2020

IET Science, Measurement & Technology

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Section: Thermodynamic and Electrical Parametersmentioning

confidence: 99%

Investigation on distribution of electro‐thermal coupled field and improved design of ±1100 kV converter valve‐side bushing

Liu

Chen

Liang

et al. 2020

IET Science, Measurement & Technology

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“…Even if there is no sufficient time for an orientation, the energy injected causing the dipole-moment is sufficient enough to cause the dielectric loss in the insulation. 30,31 For example, if moisture is present in the insulation, then the amount of energy that acts upon the dipole moment is larger causing more deviations in the magnitude frequency response function. 30,31 So, a simple comparative analysis may be sufficient to determine the status of the insulation.…”

Section: Application Of Fra In Determining the Insulation Status Of Tmentioning

confidence: 99%

“…The characteristics of an insulation is described by its material properties such as conductivity ( ), loss factor (tan ), complex permittivity ( ), geometry, etc., 3,28,[30][31][32] The dynamic characteristics of an insulation additionally depends on applied voltage and frequency and the corresponding macroscopic and molecular behaviour can be adequately described using a simple lumped circuit representation. 31 So, analyzing the high frequency behaviour of an insulation by injecting sinusoidal signals in discrete frequency steps and measuring, analyzing their response in terms of admittance/impedance function, altogether constitute the underlying principle of frequency response measurements.…”

Section: Underlying Principlementioning

confidence: 99%

“…Consequently, the dielectric parameters ( , , tan [ ], etc.,) are indirectly obtained by modelling and curve fitting the measured data to the adopted lumped RC circuit arrangement. 3,21,28,30,31 The frequency dependency of the insulation and pertinent series and parallel representations using RC circuit arrangement are decided based on observing the pattern manifested by the losses (tan ) and assigning exclusively the same to a constant conductivity. Depending on frequency, the loss factor (tan ) would appear either as a hyperbolically decreasing (≈1/ ) or linearly (≈ ) increasing curves respectively.…”

Section: Underlying Principlementioning

confidence: 99%

“…3,30,31 So, the charge build-up and conductivity losses appearing at low frequencies are represented as…”

mentioning

confidence: 99%

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Nonconventional measurements on insulation materials high voltage bushings and power cables using frequency response analysis method

Arumugam

2020

Engineering Reports

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Power utilities desire an alternate noninvasive test method for assessing the diagnostic status of power apparatus. The primary reason is to minimize the economic constraints and ensure lifetime and reliability of power apparatus within shorter duration. In this context, frequency response analysis (FRA) method is increasingly recommended. The underlying principle of fault diagnosis using FRA method focuses on correlating the insulation condition to the changes in the magnitude and phase frequency response function. Existing practices validates the usage of FRA method in ascertaining the insulation integrity of transformers. Further attempts to expand the potential of FRA in method in determining the insulation status of power apparatus other than transformers, lack scientific and experimental evidence. To fill this gap, a research on using FRA method in assessing the insulation condition of high voltage bushings and power cables is initiated. Initially, test samples of insulation materials that are commonly used in bushings and cables are selected. The chosen samples are prepared in such a way that they represent common defect conditions that inflict premature material degradation and failures. These samples are grouped accordingly, placed on test cells, subjected to nonconventional FRA tests and their diagnostic status are respectively ascertained through comparative analysis. Following this, the pertinent findings are validated on actual bushings and power cables installed on a power transformer. In summary, the findings of this studies not only validate the usage of FRA method but provides the missing scientific and technical evidences and indices that could be used for diagnosing power apparatus. K E Y W O R D S bushings, cables, frequency response analysis, nonconventional, transformersThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Wang

et al. 2023

Adv Materials Inter

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Interfaces are essential components in polymer contact systems, which widely exist in electronic devices and power equipment. Interface charge originating from the mismatch of the electronic structure in interfaces is one of the key issues to modify the device performance due to its multifunctional migration and accumulation behaviors. Hence, the detection and analysis of the interface charge characteristics are of great importance to deeply understand the polymer contact system in various devices. This paper presents an overview of recent research progress in the interface charge properties at dielectric interfaces. Based on the theoretical analysis of the MWS polarization and electronic localized states, two typical approaches of discussing the interface charges from micrometer to millimeter are mainly studied. Acoustic method is prevalent in detecting the space charge in various dielectrics. However, owing to its limited resolution (several µm), it is difficult to clarify the charge distributions at the interface with a micro‐scale. Probe microscopy presents a promising technique due to its flexible surface potential detection at a submicron scale. The challenges and prospects of acoustic and probe microscopy methods are discussed in this paper. The advanced techniques of interface charges can promote the development of new energy electronic devices.

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Dielectric response and space charge in epoxy impregnated paper composite laminates

Cited by 17 publications

References 20 publications

Investigation on distribution of electro‐thermal coupled field and improved design of ±1100 kV converter valve‐side bushing

Investigation on distribution of electro‐thermal coupled field and improved design of ±1100 kV converter valve‐side bushing

Nonconventional measurements on insulation materials high voltage bushings and power cables using frequency response analysis method

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

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