Packet-like charge formation in cable insulating materials at polarity reversal

Tanaka, Yasuhiro; Fujitomi, Toshiyuki; Kato, Tsuyoshi; Miyake, Hiroaki; Mori, Hiroki; Kikuchi, Saki; Yagi, Yukihiro

doi:10.1109/tdei.2017.006132

Cited by 28 publications

(9 citation statements)

References 8 publications

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“…The charge inside the deep portion of the polymer also dissipates quickly at the short-circuit stage of some DC conditions. This kind of rapid charge migration has also been found in previous charge measurements [ 16 , 17 , 18 ]. Under some DC and voltage transition conditions, space charge appears or dissipates immediately after the voltage state changes.…”

Section: Discussionsupporting

confidence: 84%

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Ren

Tanaka

et al. 2021

Polymers

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In this paper, we studied the space charge phenomena of a solid polymer under thermal and electrical stresses with different frequencies and waveforms. By analyzing the parameter selection method of a protection capacitor and resistor, the newly built pulsed electro-acoustic (PEA) system can be used for special electrical stresses under 500 Hz, based on which the charge phenomena are studied in detail under positive and negative DC and half-wave sine and rectangular wave voltages. Experimental results show that the charge accumulated in the polyimide polymer under DC conditions mainly comes from the grounded electrode side, and the amount of charge accumulated with electric field distortion becomes larger in a high-temperature environment. At room temperature, positive charges tend to accumulate in low-frequency conditions under positive rectangular wave voltages, while they easily appear under high-frequency situations of negative ones. In contrast, the maximum electric field distortion and charge accumulation under both half-wave sine voltages occur at 10 Hz. When the measurement temperature increases, the accumulated positive charge decreases, with a more negative charge appearing under rectangular wave voltages, while a more positive charge accumulates at different frequencies of half-wave sine voltages. Therefore, our study of the charge characteristics under different voltage and temperature conditions can provide a reference for applications in the corresponding environments.

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Section: Discussionsupporting

confidence: 84%

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Ren

Tanaka

et al. 2021

Polymers

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“…Wang shaohe, Tu Youping and et al studied the effect of polarity reversal on space charge properties of CB/LDPE composite and found that CB nanoparticles can inhibit the space charge accumulation after the voltage polarity reversal [11]. Tanaka et al found that the packet-like charge generated in XLPE under voltage polarity reversal, whereas the packet-like charge was not observed in a modified XLPE [12]. Although the Maxwell-Wagner (MW) polarization model is used to study the dynamic characteristics of the interface charge of multilayer dielectric, some experimental results are not always consistent with the MW model.…”

Section: Introductionmentioning

confidence: 99%

Space charge dynamics in epoxy resin under voltage polarity reversal at various temperatures

Liu

Zhang

et al. 2020

High Voltage

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Epoxy resin has been used to cast the core of the dry‐type high voltage direct current bushings and can accumulate space charge under high electric fields at high temperatures, which is believed to be a potential threat to the safe operation of dry bushings, especially under polarity reversal. In this study, results of a study of the evolution of space charge and electric field distribution in epoxy resin, under polarity reversal at 10 and 20 kV/mm, and at temperatures between 40 and 100°C, are presented. The results show that the space charge dynamics in epoxy resin during the test were different at various temperatures. At temperatures no more than 60°C, space charge accumulation within the samples was not obvious. Instead, a low‐frequency dielectric relaxation process maybe occurs during the polarity reversal, which made the charge peaks on the electrodes after the reversal were slightly smaller than those before the reversal. At temperatures no less than 80°C, considering that the applied electric field has little effect on the barrier reductions of the traps within the samples, the space charge dynamics were mainly governed by a thermally activated process, and the depths of the deepest occupied traps were obtain by analysing the transient processes.

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“…They demonstrate that the composite film containing 0.03 wt.% CB nanoparticles shows a better effect in suppressing the charge accumulation after the VPR. Tanaka et al [10] found that a large amount of packet-like charge accumulates in normal cross-linked polyethylene (XLPE) used in the cable insulation after the VPR, and the local electric field is significantly enhanced by the space charge accumulation. Du et al [11] researched the influence of VPR on the distribution of space charge and the properties of breakdown in XLPE/graphene oxide (GO) nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polarity Reversal Period and Temperature Gradient on Space Charge Evolution and Electric Field Distribution in HVDC Extruded Cable

et al. 2022

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During the operation of HVDC extruded cables, voltage polarity reversal (VPR) is considered one of the most severe conditions for cable insulation. In this paper, a bipolar charge transport model developed for cylindrical geometry is improved by introducing ionic carriers from impurity dissociation for the simulation of space charge and electric field in an HVDC extruded cable with thick polymeric insulation under VPR, and the construction of the geometric model is based on a practical 160 kV DC polymeric cable. The influence of polarity reversal period (PRP) and temperature gradient (TG), formed by the load current flowing through the conductor, on the space charge evolution and the electric field distribution are investigated. The mechanisms of the charge dynamics and the field distortion affected by the PRP and the TG are also discussed. The results show that under TG, the maximum transient field appears near the interface between the conductor shield and insulation in the early stage of complete VPR. In addition, the longer the PRP, the more serious the maximum transient field distortion. Moreover, an increase in TG intensifies the maximum field distortion under steady and transient states due to the enhancement of heterocharge accumulation.

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Packet-like charge formation in cable insulating materials at polarity reversal

Cited by 28 publications

References 8 publications

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

Space charge dynamics in epoxy resin under voltage polarity reversal at various temperatures

Influence of Polarity Reversal Period and Temperature Gradient on Space Charge Evolution and Electric Field Distribution in HVDC Extruded Cable

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