Temperature gradient effect on the space charge behaviour in multilayers of oil and pressboard

Zhao, Xuefeng; Pu, Liang; Liu, Jian; Duan, Wei; Ju, Zeli; Sun, Haofei; Huang, Bo; Hao, Miao; Feng, Nanzhan

doi:10.1109/tdei.2019.008216

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…High-voltage power equipment, such as oil-immersed transformers, may reach high temperatures under operating conditions. [19,25,181] Additionally, the insulating film in superconducting cables, such as polypropylene lamination paper, polyimide, and kraft paper, must operate at low temperatures close to −196 °C. [182] Temperature can affect charge injection, transport, conduction, recombination, polarization, and trapping/de-trapping processes.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…In the case of the oil‐pressboard double‐layered dielectric, negative charges moved in the oil layer and accumulated at the interface between the oil and pressboard under isothermal conditions. [ 181 ] This indicates that the conductivity of oil is higher than that of pressboard paper at 20 °C. The polarity of the interface charge was consistent with that of the oil‐side electrode.…”

Section: Interface Charge Characteristicsmentioning

confidence: 99%

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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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Section: Effect Of Temperaturementioning

confidence: 99%

Section: Interface Charge Characteristicsmentioning

confidence: 99%

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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“…This measurement technique is quite consolidated especially for testing single layer specimens [2]. Nevertheless, during the years, several experimental tests were carried out in specimens composed of multiple layers [3][4][5]. This was with the aim to analyze the accumulation of space charge in samples simulating the different High Voltage Direct Current (HVDC) components, e.g., cables and joints [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Reliability of PEA Measurement in Presence of an Air Void Defect

et al. 2020

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This paper deals with the reliability of the Pulsed Electro-Acoustic (PEA) technique in the case of a specimen containing an air layer. The first approach to this study has been proposed by the authors in previously published works. In these papers, the mathematical description, the PEA cell simulation model, and some experimental tests have been reported. In this work, a more accurate description of the acoustic wave behavior within the PEA cell and specimen with and without an air layer is given. Moreover, the comparison between simulation and experimental tests for both cases (specimen with and without air layer) allowed the validation of the previously developed PEA cell simulation model. The latter was previously validated only for a single layer specimen, here the good performances of the model have also been confirmed in the case of a multilayer specimen, also with an air layer. Experimental and simulation results show that the air layer acts as a barrier for the acoustic signal, due to the different acoustic impedance between the air and the solid dielectric material which constitute the specimen. Therefore, the aim of the present work is to demonstrate that in the case of a three-layers specimen, composed as dielectric-air-dielectric, the PEA cell is not able to provide the complete profile of the entire specimen under test.

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Space charge and its effects on oil-paper insulation in power transformers: A review

Antony Raj

2023

Journal of Electrostatics

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Temperature gradient effect on the space charge behaviour in multilayers of oil and pressboard

Cited by 7 publications

References 19 publications

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

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

Reliability of PEA Measurement in Presence of an Air Void Defect

Space charge and its effects on oil-paper insulation in power transformers: A review

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