An Improved Calibration Method for the Measurement of Space Charge Inside Insulating Materials

Ren, Huiping; Li, Qingmin; Wang, Zhongdong

doi:10.1109/tim.2019.2913730

Cited by 13 publications

(8 citation statements)

References 31 publications

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“…The actual measurement process based on the pulsed electro-acoustic system. (a) The established PEA system and (b) the measurement method for special voltages F I G U R E 3 The equivalent circuit of the pulsed electro-acoustic system propagates to the piezoelectric transducer and is converted into an electrical signal, which is measured by the oscilloscope [21]. In the figure, R dc and C c are the protection resistor and capacitor, respectively.…”

Section: The Measurement System Based On the Pea Methodsmentioning

confidence: 99%

Effect of sinusoidal waveform and frequency on space charge characteristics of polyimide

et al. 2021

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The charge phenomena under sine and half-wave sine voltages within the frequency range of 500 Hz are studied here. Based on the pulsed electro-acoustic method, the traditional circuit design under high-frequency voltages is first analysed. It is found that the selection of a 186 pF protection capacitor and a 333 kΩ protection resistor can ensure that the actual voltage applied to the sample is consistent with the expected input. Based on this design, experimental results show that the polarity of the charge accumulated in the depth of the sample is determined by that of the upper electrode. Comparison results under special voltages with different amplitudes and frequencies indicate that the amount of accumulated charge under sine voltages are larger than those under positive and negative half-wave sine and DC conditions, and the samples under lower-frequency conditions show more charge accumulation. The maximum electric field strengths appear at 90 and 270 degrees of the sine voltage with a frequency of 10 Hz, and their values are 68.55 and 81.82 kV/mm, respectively. Therefore, the charge characteristics are easily affected by the voltage's waveform and frequency parameters. The results obtained here can provide guidance for the application of insulating materials under special voltage environments.This 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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Section: The Measurement System Based On the Pea Methodsmentioning

confidence: 99%

Effect of sinusoidal waveform and frequency on space charge characteristics of polyimide

et al. 2021

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“…Then, the pressure wave was generated from space charge due to its vibration and finally measured by the oscilloscope. The whole measurement processes was carried out via a computer [ 14 ].…”

Section: The Pea System Applied For High-frequency Voltage Conditionsmentioning

confidence: 99%

“…The amplitude of all the following applied electric fields was set as 60 kV/mm. In addition, for the inevitable distortion of the measured signal by the equipment, the corresponding calibration method was also designed, which also shows a high precision compared to past methods [ 14 ]. The measurement below was repeated many times to ensure that the results and conclusions were accurate and reliable.…”

Section: The Pea System Applied For High-frequency Voltage Conditionsmentioning

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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“…From Figure 1, there are mainly three processes including recombination, trapping and detrapping during the charge migration, which thus determine the calculation of the source term, as shown in Equation (2). (1 ) (2) where μ and t represent the free carriers and trapped charges, respectively. e and h are the electrons and holes.…”

Section: Basic Principle Of the Bct Modelmentioning

confidence: 99%

“…SPACE charge accumulated inside insulating materials is the key factor in influencing breakdown, aging and deterioration. An accurate research on charge distribution thus has an extraordinary significance [1,2]. At present, the measurement and simulation researches on space charge mainly focus on DC conditions faced by traditional power equipment.…”

Section: Introductionmentioning

confidence: 99%

Numerical Research on Space Charge inside Solid Dielectrics under Unipolar and Bipolar Voltage Conditions

Ren

Gao

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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This paper focuses on the effect of unipolar and bipolar square, sine and triangle voltages on space charge characteristics inside solid insulation based on the bipolar charge transport model. According to the model solution process and the polarization characteristics, it is found the algorithms for the model should be chosen with regard to the direction of the electric field at each subdivision inside the calculation sample. Further comparison shows that the charge amount under different conditions is mainly determined by the input power of the imposed voltage, while the migration depth of the injected charge is less than 20 μm from the sample surface. Correlation between the current injection and the charge amount indicates that the variation trends of them follow basically the same. The results under unipolar conditions are not affected by the frequency provided it is larger than 10 Hz, while the charge amount under bipolar ones is negatively correlated to the frequency. Meanwhile, the impact of the initial phase of bipolar polarization decreases rapidly with the increased simulation time. Hence, for space charge measurement inside dielectrics under such conditions, a reliable system should be established according to the polarity and waveforms of the polarization.

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An Improved Calibration Method for the Measurement of Space Charge Inside Insulating Materials

Cited by 13 publications

References 31 publications

Effect of sinusoidal waveform and frequency on space charge characteristics of polyimide

Effect of sinusoidal waveform and frequency on space charge characteristics of polyimide

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

Numerical Research on Space Charge inside Solid Dielectrics under Unipolar and Bipolar Voltage Conditions

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