A New Method for Space Charge Measurements Under Periodic Stress of Arbitrary Waveform by the Pulsed Electro-Acoustic Method

Thomas, C.; Teyssèdre, G.; Laurent, C.

doi:10.1109/tdei.2008.4483477

Cited by 27 publications

(20 citation statements)

References 15 publications

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“…The charge density profiles of Al/LDPE (Fig.3) points out that Al electrodes provide negative charges at low field and no specific injection enhancement for high fields. Space charge results of In and Ag/ LDPE suggest that high electric field facilitates positive charge injection and higher conduction current while Al/LDPE with a large amount of negative space charge has a lower conduction current than In and Ag electrodes, so we can believe that the conduction current is controlled mostly by positive charges, which appears fairly consistent with the higher mobility reported for holes in the investigated material [8]. The barrier height for the injection without surface states is expressed by (Fig.4):…”

Section: B Space-charge Measurementsupporting

confidence: 79%

Role of the interface on charge build-up in a low-density polyethylene: Surface roughness and nature of the electrode

Taleb

Teyssèdre

Roy

2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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The aim of this work is to better understand the impact of the nature of the metal and of the surface topology on the charge generation at a metal / dielectric interface. Conduction current and space charge measurements using the Pulsed Electro-Acoustic method (PEA) have been carried out on low density polyethylene (LDPE-A) films with different metal electrodes (Au, Al, Ag, In) in order to evaluate the role of the carriers (hole, electron) injection barrier height on the charge build-up. The impact of the roughness of the interface has also been theoretically investigated. Experimental surface profiles have been introduced in a model able to simulate the surface roughness in two dimensions, and to calculate the electric field and the injection current.

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Section: B Space-charge Measurementsupporting

confidence: 79%

Role of the interface on charge build-up in a low-density polyethylene: Surface roughness and nature of the electrode

Taleb

Teyssèdre

Roy

2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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“…Meanwhile, the charge migration depth inside the sample is less than 20 μm. By contrast, there is obvious difference between the charge distributions at different frequencies under bipolar conditions, which is consistent with the experimental phenomenon that more charge accumulates at lower frequencies in [24]. The charge migration depth is only about 5 μm, which further indicates that due to the spatial resolution, the measurement systems in the Introduction cannot accurately observe the charge distribution inside the sample adjacent to the electrode interface under such conditions.…”

Section: Influence Of Frequency and Amplitude Of Polarization Conditionssupporting

confidence: 81%

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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“…However, increasing temperature undoubtedly breaks the rule with negative charge accumulation clearly observable at 10Hz and 50°C. Measurements up to 50Hz are achievable with the actual PEA hardware with careful prevention of surface and corona discharges in the environment of samples [6,9]. As measurements can be achieved safely up to 6kV voltage only at 50Hz [9], they were not attempted in the present set.…”

Section: Discussionmentioning

confidence: 99%

“…Measurements up to 50Hz are achievable with the actual PEA hardware with careful prevention of surface and corona discharges in the environment of samples [6,9]. As measurements can be achieved safely up to 6kV voltage only at 50Hz [9], they were not attempted in the present set. However, we can reasonably anticipate that long enough stressing time at the industrial frequency would also lead to charge accumulation.…”

Section: Discussionmentioning

confidence: 99%

Space-charge dynamic in polyethylene: from dc to ac stress

Thomas

Teyssèdre

Laurent

2010

J. Phys. D: Appl. Phys.

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Abstract. Time-resolved space charge profiles obtained in low density polyethylene under sinusoidal or square AC stress for frequencies going from DC to 10 Hz, temperature from 25 to 50°C and fields of 30 or 40 kV/mm are presented. It is shown that most of the features observed under DC stress (generation of carriers of the two polarities with non-symmetrical amount and velocity) are still active under AC stress. As a matter of fact, it is shown that a negative space charge builds up at 50°C within the whole insulation bulk even with relatively high stress frequency and for short stressing time (2 h). These results clearly show that space charge has to be considered under AC condition.Confidential: not for distribution.

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A New Method for Space Charge Measurements Under Periodic Stress of Arbitrary Waveform by the Pulsed Electro-Acoustic Method

Cited by 27 publications

References 15 publications

Role of the interface on charge build-up in a low-density polyethylene: Surface roughness and nature of the electrode

Role of the interface on charge build-up in a low-density polyethylene: Surface roughness and nature of the electrode

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

Space-charge dynamic in polyethylene: from dc to ac stress

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