Research on Charge Accumulation Characteristics by PEA Method and <i>Q</i>(<i>t</i>) Method

Ren, Huiping; Takada, Tatsuo; Uehara, Hiroaki; Iwata, Seiko; Li, Qingmin

doi:10.1109/tim.2021.3055288

Cited by 20 publications

(12 citation statements)

References 26 publications

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“…This phenomenon is caused by the rapid migration speed of space charge. In addition to the space charge with a mobility in the range from 10 −17 to 10 −13 m 2 /(Vs), which has been observed by most measurement results, the charge in shallow traps can migrate quickly inside the sample [ 19 ]. According to the space charge phenomena observed by some researchers, it has been calculated that the mobility of rapid charge is nearly 10 −9 m 2 /(Vs) [ 20 , 21 ].…”

Section: Discussionmentioning

confidence: 99%

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Ren

Tanaka

et al. 2021

Polymers

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In this paper, we studied the space charge phenomena of a solid polymer under thermal and electrical stresses with different frequencies and waveforms. By analyzing the parameter selection method of a protection capacitor and resistor, the newly built pulsed electro-acoustic (PEA) system can be used for special electrical stresses under 500 Hz, based on which the charge phenomena are studied in detail under positive and negative DC and half-wave sine and rectangular wave voltages. Experimental results show that the charge accumulated in the polyimide polymer under DC conditions mainly comes from the grounded electrode side, and the amount of charge accumulated with electric field distortion becomes larger in a high-temperature environment. At room temperature, positive charges tend to accumulate in low-frequency conditions under positive rectangular wave voltages, while they easily appear under high-frequency situations of negative ones. In contrast, the maximum electric field distortion and charge accumulation under both half-wave sine voltages occur at 10 Hz. When the measurement temperature increases, the accumulated positive charge decreases, with a more negative charge appearing under rectangular wave voltages, while a more positive charge accumulates at different frequencies of half-wave sine voltages. Therefore, our study of the charge characteristics under different voltage and temperature conditions can provide a reference for applications in the corresponding environments.

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Section: Discussionmentioning

confidence: 99%

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Ren

Tanaka

et al. 2021

Polymers

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“…These circumstances have increased the requirement for research on the diagnoses of electrical insulators. Q(t) measurement is a diagnostic technique used for electrical insulators in power devices, cables, and other equipment [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Q(t) measurement was first demonstrated in the 1970s by Takada et al [1], and the mechanism and structure of the circuit are almost the same as those of a leakage current detector, which can detect an extremely small electric current that indicates the incompleteness and/or the defects of electrical insulation inside insulators.…”

Section: Introductionmentioning

confidence: 99%

Circuit Models of Q(t) Data and Analyses of Saturation Time Dependency on Delay Parameters

Kitani,

Iwata,

Tsuya

et al. 2024

IEEE Access

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In recent years, there has been a considerable increase in the use of DC power equipment in the industry, making it crucial for insulation materials to withstand high DC electric fields. The current integration method (Q(t) measurement) is one of the most useful and effective methods to measure the time dependency of charges. However, the mathematical/physical model of Q(t) measurement is not advanced because obtained data are not completely analyzed, particularly the methods in which delay parameters affect the charge saturation time of insulators. In this study, we analyze the delay property of Q(t) data by solving differential equations with some approximations. In addition, sample sheets of polyimide and polyethylene terephthalate are tested for experimental purposes. The results indicate that circuit properties can be estimated from the analysis of experimental Q(t) data based on the assumption of a circuit model. The proposed analysis method can be used for further discussions regarding the analytical estimation of timing of charge saturation, and the relationship between circuit models and the space charges phenomenon.

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“…Studies on the interaction mechanism of interface have a very important impact on the explanation of properties of nanocomposites. However, most studies only investigated the charge transport behavior at the interface in bulk materials through several techniques at the macro scale, such as thermal stimulation current (TSDC), broad band dielectric spectroscopy measurement, and pulsed electro-acoustic measurement [28][29][30]. Generally, the chemical and physical interfacial area between the polymer matrix and the filler is often only tens of nanometers to several micrometers [31,32].…”

Section: Introductionmentioning

confidence: 99%

Local charge transport at different interfaces in epoxy composites

Jia¹,

Zhou²,

Chen³

et al. 2022

Nanotechnology

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Charge transport in insulating composites is fundamental to designing high performance in electrical breakdown strength processes. A fundamental understanding of the charge transport at nanoscale in insulating composites remains elusive. Herein, we fabricate two types of interfaces in epoxy (EP) composites (Al2O3/EP and bubble/EP, respectively). Then the local dynamic charge mobility behavior and charge density are explored using in-situ Kelvin probe force microscopy (KPFM). After the external voltage in the horizontal direction is applied, significant differences are demonstrated in the evolution of charge transport for epoxy matrix, filler/bubble, and their interface, respectively. The interface between Al2O3 and epoxy is easier to accumulate the negative charges and introduce shallow traps. Lots of positive charges are located around a bubble where deeper traps are present and could prevent charge migration. Thus, this work offers extended experimental support to understanding the mechanism of charge transport in dielectric composites.

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Research on Charge Accumulation Characteristics by PEA Method and Q(t) Method

Cited by 20 publications

References 26 publications

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Circuit Models of Q(t) Data and Analyses of Saturation Time Dependency on Delay Parameters

Local charge transport at different interfaces in epoxy composites

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