Techniques for the estimation of ac space charge accumulation threshold for insulating materials

Montanari, G.C.; Raffaelli, L.; Palmieri, F.; Martinotto, L.; Serra, Stefano

doi:10.1109/ceidp.2001.963581

Cited by 3 publications

(1 citation statement)

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“…The oldest one concerns the accumulation of space charge in the bulk of the material under ac stress. It is generally considered that most of the carriers injected at electrodes during a half-cycle are ejected during the next half-cycle, so the net balance of charge on a cycle is zero [17]. It is shown in this work that there is an unbalance between charge injection and extraction leading to a slow accumulation of charge with stressing time, all the more when the temperature is high, and this behaviour is evidenced in the range of the industrial frequency.…”

Section: Discussionmentioning

confidence: 68%

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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Section: Discussionmentioning

confidence: 68%

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

Thomas

Teyssèdre

Laurent

2010

J. Phys. D: Appl. Phys.

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Combined space charge and electroluminescence detection in polyethylene under AC stress

Tardieu

Teyssèdre²,

Laurent³

et al.

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225)

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Time-resolved space charge and electroluminescence measurements are carried out during 50 Hz AC voltage cycles to probe injection, trapping and recombination of charges in polyethylene films. Space charge detection allows defining a field value above which space charge accumulates. This field is well correlated with the onset for electroluminescence. The behavior is consistent with a model of bipolar injection. It is also shown that different polyethylenes behave differently regarding the field above which charge is injected, providing a way to compare the ability of different materials to sustain AC field. through space charge and conduction current measurements", in Proc. ICSD,

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