Study of space charge accumulation in polyolefins submitted to ac stress

Notingher, P.; Toureille, A.; Santana, J.; Martinotto, L.; Albertini, M.

doi:10.1109/94.971454

Cited by 37 publications

(22 citation statements)

References 25 publications

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“…26 revealed that the frequency of the applied voltage plays a key role in the formation of space charge in polymeric insulation, while the study in Ref. 30 indicated that the space charge in the bulk of the sample aged under ac conditions at 40-kV/mm rms for 14 days is related to polymeric materials and the amount of charge depends on temperature. The electrodes used for study in Ref.…”

Section: Discussionmentioning

confidence: 99%

“…The electrodes used for study in Ref. 30 were graphites. Our results clearly demonstrate that the level of the applied voltage, the duration of the voltage application, and electrode materials are also important in determining the charge formation and its dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…Work on the dynamics and the role of space charge on electrical breakdown under 50-Hz ac conditions has only received limited attention. [22][23][24][25][26][27][28][29][30] As the majority of XLPE high-voltage ͑HV͒ cables will be operating under ac conditions in the immediate future, it is appropriate to investigate charge trapping and mobility under such conditions. Earlier results using the pulsed electroacoustic technique 26 revealed that although there was charge accumulation at very low frequencies ͑Ͻ0.01 Hz͒ the charge formation at high frequency was negligible especially at power frequency.…”

Section: Introductionmentioning

confidence: 99%

“…However, if the applied field is high enough and the duration of the voltage application is long enough a small fraction of injected charge can be trapped. Indeed, work using other measurement techniques [22][23][24]27,28 demonstrated the presence of space charge in polymeric cable insulation materials under ac conditions. Due to the recombination of majority of electrons and holes alternatively injected each half cycle at 50 Hz, 29 little quantitative charge distributions were presented.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the recombination of majority of electrons and holes alternatively injected each half cycle at 50 Hz, 29 little quantitative charge distributions were presented. The study of space charge at 50 Hz at high temperatures using thermal step method 30 revealed that after 14 days aging at 40-kV/mm rms a significant amount of charge has been accumulated in the samples. The amount of charge depends on both materials and temperature.…”

Section: Introductionmentioning

confidence: 99%

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ac aging and space-charge characteristics in low-density polyethylene polymeric insulation

Chen

Liu

et al. 2005

Journal of Applied Physics

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In the present work efforts have been made to investigate the influence of ac aging on space-charge dynamics in low-density polyethylene ͑LDPE͒. LDPE films with 200 µm were aged under various electric stress levels at 50 Hz for various times at ambient temperature. Space-charge dynamics in the samples after aging were monitored using the pulsed electroacoustic technique. It has been revealed that the space charge under ac aging conditions is related to the level of the applied field, duration of the voltage application, as well as the electrode materials. By comparing with the results of unaged sample the results from aged sample provide a direct evidence of changing trapping characteristics after ac aging. Negative space charge is present in the bulk of the material and the total amount of charge increases with the aging time. The amount of charge increases with the applied field. Charge decay test indicates that the charges are captured in deep traps. These deep traps are believed to form during the aging and related to change caused by injected charge. By using different electrode materials such as gold, brass alloy, and polyethylene loaded with carbon black, it was found that the electrode has an important role in the formation of charge, hence subsequent changes caused by charge. The charge dynamics of the aged samples under dc bias differ from the sample without ac aging, indicating changes brought in by ac aging. Chemical analysis by Fourier transform infrared spectroscope and Raman microscope reveals no detectable chemical changes taken place in the bulk of the material after ac aging. Finally, the consequence of the accumulation of space charge under ac conditions on the lifetime of the material has been discussed. The presence of deeply trapped space charge leads to an electric stress enhancement which may shorten the lifetime of the insulation system.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ac aging and space-charge characteristics in low-density polyethylene polymeric insulation

Chen

Liu

et al. 2005

Journal of Applied Physics

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The Thermal Step Method for Space Charge Measurements

Toureille¹,

Agnel²,

Notingher³

et al. 2013

Dielectric Materials for Electrical Engineering

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Gate‐Free Controlled Multibit Memories Based on Individual ZnO:In Micro/Nanowire Back‐to‐Back Diodes

Zhao

Cheng

Xiao

et al. 2016

Adv Elect Materials

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interface between ZnO micro/nanowires and metal electrodes due to the presence of surface states, makes the two-terminal device based on ZnO micro/nanowire a candidate for fabricating Schottkybased back-to-back diodes. Moreover, the Schottky-based back-to-back diodes always accompany with the resistive switching (RS) effect. The switching mechanism, such as formation/rupture of conducting fi lament, [ 21,22 ] charge-trap model alteration of Schottky barrier, [ 23,24 ] space-charge-limited current, [ 25 ] and Mott transition, [ 26,27 ] have been reported to explain the origin of RS properties. The Schottky-like diode can also be easily formulated by hybridization, heterostructure, and doping. [ 28,29 ] Abundant defects can be introduced by doping, resulting in the formation of traps with different levels. Additionally, annealing treatment in hydrogen atmosphere can also form miscellaneous deep trap levels for charge storage reservoir. [30][31][32][33] For resolving the diffi culty to realize the actively tunable Schottky diode, many publications have a tendency to set up gate voltages or complex confi gurations. [33][34][35] In this work, twoterminal devices, based on individual In-doped ZnO micro/ nanowires, were fabricated for the fi rst time, in which the I-V characteristics of the back-to-back diode can be controllably regulated by temperature and drain-source voltage ( V DS ) without the assistance of gate voltage. The introduction of indium impurities in ZnO leads to the formation of modulated superstructure, generating abundant traps. The conduction mechanism dominantly originates from the modulation of trap-related Schottky-barrier height at the metal-semiconductor interface by the fi ling/emptying of electron in traps. Electrons can be extracted from traps via a thermal excitation in the condition of heating and relatively low operation voltage, and contrarily they can be injected into traps by applying a relatively high V DS at room temperature. Moreover, the fi lled depth of trap states strongly depends on the externally applied V DS . In addition, the electrons can stably be localized in traps after completely removing the applied V DS , resulting in a memory effect. Therefore, not only tunable RS but nonvolatile multibit resistance random access memory (RRAM) can be obtained effectively. Results and DiscussionRepresentative XRD pattern of as-synthesized product is shown in Figure 1 a. All the diffraction peaks can be indexed to ZnO with a hexagonal wurtzite structure (JCPDS No. 36-1451).

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Study of space charge accumulation in polyolefins submitted to ac stress

Cited by 37 publications

References 25 publications

ac aging and space-charge characteristics in low-density polyethylene polymeric insulation

ac aging and space-charge characteristics in low-density polyethylene polymeric insulation

The Thermal Step Method for Space Charge Measurements

Gate‐Free Controlled Multibit Memories Based on Individual ZnO:In Micro/Nanowire Back‐to‐Back Diodes

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