Packet-like space charges and conduction current in polyethylene cable insulation

Kon, Hiroyuki; Suzuoki, Y.; Mizutani, Teruyoshi; Ieda, Masayuki; Yoshifuji, N.

doi:10.1109/94.506210

Cited by 70 publications

(31 citation statements)

References 6 publications

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“…It is known that the space charge formation is associated with insulation degradation. (1)(2)(3)(4)(5) In the last two decades, Auge et al (6) and Montanari et al (7) have experimentally evaluated a critical applied field strength to start the electrical degradation by measuring not only space charge distribution, but also external current and electroluminescence (EL) under 1 MV/cm. They confirmed that the critical applied field for space charge injection from a Au-evaporated electrode into the LDPE bulk was in good agreement with both the critical field for EL detection and that corresponding to the transition point of the conduction mechanism from the Ohmic model to the space-charge-limited current (SCLC) model.…”

Section: Introductionmentioning

confidence: 99%

Current Saturation Due to Strong Field Concentration into Local Thin Area in Low-density Polyethylene Sheet under Stepwise Increasing DC Voltage

2017

Sensors and Materials

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Generally, space charge formation in dielectrics subjected to DC voltage results in the enhancement of a conduction current called space-charge-limited current (SCLC). In this study, we find an interesting phenomenon that the conduction current for a low-density polyethylene (LDPE) sheet does not increase with increasing applied voltage even though a large number of space charges are accumulated in its bulk. Simultaneous measurements of the conduction current and space charge distribution are carried out for a 150-μm-thick additive-free LDPE between a semiconduction anode and an aluminum-evaporated cathode. Under a low applied field of below 0.6 MV/cm, the current is proportional to the square of the applied field because the maximum field strength in LDPE becomes higher than the mean applied field strength due to space charge formation in the LDPE bulk. Both the space charge distributions and the corresponding field distributions obtained by the simultaneous measurement roughly agree with the theoretical distributions based on the SCLC model. By increasing the applied field, however, the steady-state current saturates although a large number of positive space charges are accumulated in the LDPE bulk. We confirm that the steady-state current is restricted when a large number of frozen positive charges in front of the cathode are formed causing the strong field enhancement at a limited local thin area. These results imply that the carrier mobility at the local thin area was reduced by the excess field enhancement.

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Section: Introductionmentioning

confidence: 99%

Current Saturation Due to Strong Field Concentration into Local Thin Area in Low-density Polyethylene Sheet under Stepwise Increasing DC Voltage

2017

Sensors and Materials

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“…It has been reported that packet charge formation may be caused by charge carrier generation under high electric field (above 100 kV dc /mm), antioxidant deteriorated by oxidation [5] and local ionization of impurities through salvation by acetophenone [6]. The samples used in this experiment, however, do not contain antioxidant and acetophenone is believed to be largely removed after the degassing process while the stress applied is much lower.…”

Section: Resultsmentioning

confidence: 84%

Effect of AC ageing on space charge evolution in XLPE

Chong

Chen

Miyake

et al.

The 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2004. LEOS 2004.

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This paper reports on space charge dynamics in XLPE samples, which have been pre-stressed under ac electric stress, when subjected to 30kV dc /mm dc electric stress for 24 hours. The samples used for this study were planar XLPE samples of ~ 220 µm thick aged under 30 kV pk /mm, 30 kV rms /mm and 60 kV pk /mm at 50 Hz ac condition for 24 hours. In addition, the experiments were also extended to samples that were pre-aged under 1 Hz and 10 Hz ac 30 kV pk /mm for 24 hours.

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“…It has been shown that above a material dependent field value of the order of 70-100 kV/mm [1], the space charge can acquire a dynamic character as compared to the situation under lower field. The most striking fact is the organization of the space charge into charge packets that cross the insulation [1,3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…They appear as the apparent motion of charge particles (being either positive [3] or negative [6] depending on materials [6], LDPE, XLPE, doped or undoped) that may cross the gap between the electrodes with apparent mobilities of the order of 10 -15 m 2 V -1 s -1 [5]. The electric field is greatly enhanced in front of the packet, and is relaxed at the tail, Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Two different interpretations have been put forward. The charge packet is described either as a body of excess charge initiated by injection from the electrodes [3,5], or as a propagating ionization front [1,6,7,8]. In the latter case field-induced ionization of impurities contained in the material occurs in front of the propagating wave, which leads to the supply of carriers to the bulk.…”

Section: Introductionmentioning

confidence: 99%

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The relationship between charge distribution, charge packet formation and electroluminescence in XLPE under DC

See

Dissado

Fothergill

et al.

ICSD'01. Proceedings of the 20001 IEEE 7th International Conference on Solid Dielectrics (Cat. No.01CH37117)

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Packet-like space charges and conduction current in polyethylene cable insulation

Cited by 70 publications

References 6 publications

Current Saturation Due to Strong Field Concentration into Local Thin Area in Low-density Polyethylene Sheet under Stepwise Increasing DC Voltage

Current Saturation Due to Strong Field Concentration into Local Thin Area in Low-density Polyethylene Sheet under Stepwise Increasing DC Voltage

Effect of AC ageing on space charge evolution in XLPE

The relationship between charge distribution, charge packet formation and electroluminescence in XLPE under DC

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