Properties of Space Charge Distributions and Conduction Current in XLPE and LDPE under DC High Electric Field

Kato, Tsuyoshi; Onozawa, Ryo; Miyake, Hiroaki; Tanaka, Yasuhiro; Takada, Tatsuo

doi:10.1541/ieejfms.135.75

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…[5][6][7][8][9] Therefore, there are many studies on the time-dependent charge distribution. [10][11][12][13][14][15][16][17][18] In most of these studies, temporal changes in space charge distribution were observed on long time scales of the order of 10 min. On the other hand, there are only few reports on space charge dynamics on a shorter time scale of the order below 10 −1 s. [19][20][21][22][23] To observe the transient phenomena of space charge transport in a millisecond range, high-speed sampling techniques are required.…”

Section: Introductionmentioning

confidence: 99%

Observation of current spikes caused by possible fast carrier transport through a low-density polyethylene sheet under high DC fields

Kadowaki¹,

Ochi²,

Mihara³

et al. 2018

Jpn. J. Appl. Phys.

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The repetitive current spikes caused by possible fast carrier transport through a low-density polyethylene (LDPE) sheet under high DC fields from 0.1 to 2.0 MV/cm are simultaneously measured with space charge distributions. Although a constant dc voltage is applied to the sheet between a semi-conduction (SC) electrode and an Al-evaporated electrode, large current spikes of the order of 10−8 A are repeatedly superimposed onto the dc conduction current of the order of 10−10 A. Results of the space charge measurements indicate that the charge injection from the SC anode and the subsequent deep penetration into the LDPE bulk can be observed when the current spikes are repeatedly detected. In addition, we find that a phenolic antioxidant added into the LDPE has an inhibition effect not only on the space charge penetration but also on the repetitive current spikes. This finding suggests that the antioxidant additive produces a deep trapping site for fast-moving carriers.

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Section: Introductionmentioning

confidence: 99%

Observation of current spikes caused by possible fast carrier transport through a low-density polyethylene sheet under high DC fields

Kadowaki¹,

Ochi²,

Mihara³

et al. 2018

Jpn. J. Appl. Phys.

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show abstract

“…Experimental results show that the relationships between the current and the applied field are strongly affected by not only electrode materials but also an antioxidant additive in LDPE. (13) In addition, an interesting phenomenon about the current-voltage characteristics is observed for an additive-free LDPE sheet between a semiconduction (SC) anode and an aluminum (Al)-evaporated cathode. Results show that the conduction current under a DC stepwise increasing voltage up to 30 kV is saturated even though the space charge density in the LDPE bulk increases with increasing applied voltage.…”

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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Simultaneous measurement of space charge distribution and external circuit current in XLPE under HVDC at high temperature

Kasuga

Fujitomi

Miyake

et al. 2016

2016 IEEE International Conference on Dielectrics (ICD)

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Properties of Space Charge Distributions and Conduction Current in XLPE and LDPE under DC High Electric Field

Cited by 5 publications

References 8 publications

Observation of current spikes caused by possible fast carrier transport through a low-density polyethylene sheet under high DC fields

Observation of current spikes caused by possible fast carrier transport through a low-density polyethylene sheet under high DC fields

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

Simultaneous measurement of space charge distribution and external circuit current in XLPE under HVDC at high temperature

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