On the anomalous charging and discharging currents in LDPE under high electric fields

Tiwana, A. P. S.; Reddy, C. C.

doi:10.1109/tdei.2018.006834

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…The conduction current in LDPE films in response to an applied step voltage typically follows a power-law decay in time. 18,25 At high applied electric field (above 10 kV/mm) the current decay was attributed to the polarization of dipoles, the slow movement of the carriers, and blocking electrodes. 25 The power-law decay was also observed in this work and is presented in the Supplementary information section in detail.…”

Section: Resultsmentioning

confidence: 99%

“…16 At higher fields, current behaves nonlinearly and space charge dominates electrical conduction. [17][18][19] Theoretical models have been proposed to explain high field phenomena including: Schottky injection from electrodes, 20 space charge limited current (SCLC), 17 hopping mechanisms, 21 and the Poole-Frenkel model. 22 These models utilize current-voltage (IV) measurements where nonlinear behavior at high electric field is often used to determine the underlying mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Transient behavior of electrical conductivity in low‐density polyethylene in the presence of acetophenone

Hamedi

Walker

Woodward

et al. 2021

J of Applied Polymer Sci

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The transient current in low-density polyethylene (LDPE) is studied, particularly in the presence of the small organic molecule acetophenone (ACP). Crosslinked LDPE is used extensively in high-voltage power transmission, and acetophenone is a common byproduct of the crosslinking chemistry. Timedependent current measurements of LDPE with and without ACP soaked into the polymer as well as at one or both electrodes are performed by applying step

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient behavior of electrical conductivity in low‐density polyethylene in the presence of acetophenone

Hamedi

Walker

Woodward

et al. 2021

J of Applied Polymer Sci

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“…Volumetric current test for each multi-layer sample is conducted for 60 minutes. Such a time is typically sufficient to ensure that all polarization currents would have almost ceased to contribute to the measured steady state current [10,11]. The entire procedure is repeated for five different samples.…”

Section: Methodsmentioning

confidence: 99%

Electric Field and DC Breakdown Voltage of Multi-layer Dielectrics in Parallel-Plane Geometry

Muppala

Reddy

2021

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the electric field, space charge and temperature distributions across a double layered dielectric are investigated under DC voltage. The dissimilarity of material properties of different layers, the effect of electric field and temperature dependent conductivity are found to play critical role in the electro-thermal problem of multi-dielectrics. At the interface, Maxwell-Wagner polarization is incorporated for electric field and interfacial charge, while temperature is considered as a continuous function of space inside the material. The current continuity equation, thermal continuity equation and Poisson's equation are simultaneously solved using numerical methods in parallel-plane electrode geometry. The electric field distribution, temperature distribution, space charge distribution and thermal breakdown limits are obtained at various boundary temperatures for different thickness proportions of layers.

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“…2, an instantaneous charging current [I disp (t)] appears immediately after the application of a dc voltage (V dc ), then an absorption current [I abs (t)] flows into the sample after the initial displacement current, and finally a conduction current [I cond (t)] flows upon reaching equilibrium. (11) The electric conductivity κ of the test sample can be obtained by measuring the conduction current I cond (t) and applied voltage V dc as follows.…”

Section: Conventional Picoammeter Methodsmentioning

confidence: 99%

Sensor for Accumulated Charge Detection in Packaged Insulation Layer of Insulated Gate Bipolar Transistor Power Devices

Takada¹,

Hijikata²,

Wang³

et al. 2019

Sensors and Materials

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A compact system for detecting charge accumulation in the insulation layer of power electronic devices such as insulated gate bipolar transistor (IGBT) modules was developed. The amount of electric charge accumulated in IGBT modules at high dc voltages (100 to 5000 V) and in a wide temperature range (20 to 180 ℃) was measured using the system consisting of two units. The battery-operated sensing and transmission unit (500 × 700 × 300 mm 3) was connected in series to an IGBT module to which various dc voltages were applied at various temperatures. The collected data were transmitted to a data receiving unit for analysis, which is electrically isolated from the sensing and transmission unit. The data received as a function of time Q(t) were analyzed to obtain various parameter values that provide information on the insulation status of the IGBT module, such as the amount of initial charge, absorption current, and conduction current under various conditions. On the basis of the ratio Q(t)/Q 0, where Q 0 is the amount of initial charge, the amount of charge accumulated in the IGBT modules under high-stress conditions was obtained. The compact system for accumulated charge detection will be convenient for evaluating the insulation characteristics of IGBT modules, which operate under harsh conditions in real power electronic devices such as those used in electric vehicles.

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On the anomalous charging and discharging currents in LDPE under high electric fields

Cited by 13 publications

References 22 publications

Transient behavior of electrical conductivity in low‐density polyethylene in the presence of acetophenone

Transient behavior of electrical conductivity in low‐density polyethylene in the presence of acetophenone

Electric Field and DC Breakdown Voltage of Multi-layer Dielectrics in Parallel-Plane Geometry

Sensor for Accumulated Charge Detection in Packaged Insulation Layer of Insulated Gate Bipolar Transistor Power Devices

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