Analysis of Anomalous Discharge Current in Low-Density Polyethylene

Kitani, Isamu; Tsuji, Yasumasa; Arii, Kiyomitsu

doi:10.1143/jjap.23.855

Cited by 28 publications

(13 citation statements)

References 5 publications

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“…Higher voltage application and the specimens without metal layer tended to cause positive residual voltage. The positive residual voltage was assumed to be caused by the same mechanism as the anomalous discharge current flowing in the same direction as the charging current: The anomalous discharge current is related to bipolar injection [4]. The residual voltage implies the existence of charge in the bulk of the sample regardless of the polarity.…”

Section: Introductionmentioning

confidence: 99%

Surface potential on LDPE and PP films after removal of the upper disk electrode

Kitani

Nishimoto

Arii

1996

IEEE Trans. Dielect. Electr. Insul.

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The potential distribution was measured on the free surface of low-density polyethylene (LDPE) and polypropylene (PP) films which had been inserted between plane electrodes after the removal of the upper brass disk electrode. The polarity of the surface potential was always the same as that of the applied step voltage which had been subjected to the upper electrode for a while and then shorted. The absolute Value of the surface potential tended to increase to a constant value of N 650 V with1 increasing applied voltage and application time for both polarities. There was no ap, preciable difference in the surface potential between PP and LDPE when the applied1 voltage and its application time changed. However, the increase in the shortcircuit time tended to increase the surface potential for LDPE only, while it did not changes that for PP. The effect of a longer shortcircuit on the surface potential increase for the1 LDPE films for both polarities could be explained by bipolar injection.

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Section: Introductionmentioning

confidence: 99%

Surface potential on LDPE and PP films after removal of the upper disk electrode

Kitani

Nishimoto

Arii

1996

IEEE Trans. Dielect. Electr. Insul.

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“…The decrease follows Curie von Schweidler's law after reaching a peak value. This type of current-time dependencies has earlier been observed in both low-and high-density polyethylene films at high temperature and high electric fields of typically 40 kV/mm [5,6]. The polarity change is believed to be caused by build-up of space charges consisting of electrons and holes.…”

Section: Time Domain Dielectric Responsementioning

confidence: 52%

“…The main difference from previously reported depolarization current measurements is that the average applied fields in this experiments are much lower. However, the local fields in the stress control sleeve can be much larger than the mean electric field due to the inorganic conducting fillers, and probably comparable to the fields reported in [5,6]. A field grading material should have a conductivity at least 100 times that of the cable and joint body insulation to avoid any local field enhancements [3].…”

Section: Time Domain Dielectric Responsementioning

confidence: 99%

Temperature and Field Dependence of Field Grading Tubes for Medium Voltage XLPE Cable Joints

Mauseth

Enoksen

Hvidsten

2017

NORD-IS

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In Norway it has been observed that many medium voltage (12 and 24 kV) cable sections with heat shrink joints have suffered from overheating often causing failure during service. The overheating is due to a bad metallic connection between the aluminium conductors in the joint. This is especially observed for XLPE cables installed in the 80's, which constitutes a significant part of the installed cables in the network. This paper is part of a work to elucidate the mechanisms causing a low insulation resistance of MV cable joints. As a bad metallic connection can result in local high temperatures during normal operation, the properties of a heat shrink stress control tubes commonly used in such joints has been characterized at temperatures around the melting peak of the material that is just above the maximum service temperature of 90 °C for XLPE cables. The main purpose of this paper is to examine the effect of these temperatures on the electrical properties of the field grading material. Here, the electrical properties have been characterized by time domain dielectric response measurements at different temperatures and axial electrical fields. The results show that the conductivity of the stress control tube is temperature dependent. Also, a polarity change in the depolarization current at higher electrical field strengths was observed.

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“…Kitani et al,24–26 using a numerical analysis, have concluded that the anomalous discharge current can also be obtained with a bipolar injection (electrons and holes) and with a nonblocking interface.…”

Section: Resultsmentioning

confidence: 99%

Thermally stimulated depolarization current and space charge measurements on low‐density polyethylene: Influence of the presence of antioxidant

Tebani

Boudou

Guastavino

2008

J of Applied Polymer Sci

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The purpose of this study is an investigation upstream of polymer insulator ageing and rupture. We studied the electrical and physicochemical properties of a low-density polyethylene (LDPE) used in high-power insulated cables. Space charge measurements using pulsed electroacoustic method and thermally stimulated depolarization current (TSDC) were carried out on LDPE samples, with and without antioxidant, at different temperatures. TSDC peaks were observed only in the presence of an antioxidant. Furthermore, a TSDC anomalous peak was revealed for the sample containing an antioxidant and polarized at 508C. All the TSDC peaks are interpreted as trapped charges and can be explained by measuring the space charge distribution within the sample bulk.

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Analysis of Anomalous Discharge Current in Low-Density Polyethylene

Cited by 28 publications

References 5 publications

Surface potential on LDPE and PP films after removal of the upper disk electrode

Surface potential on LDPE and PP films after removal of the upper disk electrode

Temperature and Field Dependence of Field Grading Tubes for Medium Voltage XLPE Cable Joints

Thermally stimulated depolarization current and space charge measurements on low‐density polyethylene: Influence of the presence of antioxidant

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