Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Can-Ortiz, A.; Laudebat, Lionel; Valdez-Nava, Zarel; Diaham, Sombel

doi:10.3390/polym13091370

Cited by 48 publications

(21 citation statements)

References 133 publications

(412 reference statements)

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“…Focusing on unaged materials, one can notice that the presence of fillers and additives increase the conductivity value by 1.5 orders of magnitude. This was expected since additives, particularly ATH, are species which are known to influence also the conduction current [8]. With aging, conductivity increases up to 5 orders of magnitude in the case of non-filled polymer (Figure 3.a), while it increases by 2 orders of magnitude in the case of filled polymer (Figure 3.b).…”

Section: B Conductivity Resultsmentioning

confidence: 89%

Aging assessment of insulating materials through broadband dielectric measurements: the appropriate frequency choice

Suraci

Fabiani

2021

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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In this article the dielectric response of differently filled insulating materials is studied. The contribution of polymer additives showed to influence both the dielectric spectrum and conductivity values of the considered materials. Among the different analyzed frequencies, it has been concluded that the highest frequency region (e.g. 100 kHz), related to the dipolar polarization, is affected significantly by additives and it depicts a monotonous increase with aging time, hence it could be suitable as an aging marker for cable nondestructive diagnostics.

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Section: B Conductivity Resultsmentioning

confidence: 89%

Aging assessment of insulating materials through broadband dielectric measurements: the appropriate frequency choice

Suraci

Fabiani

2021

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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“…An advantage is to decouple the stresses in the two insulations, providing field distributions independent from the behavior of the other material [38]. The development of such materials for obtaining the optimum non-linear characteristics is a topic in itself [39]. In cable domain, field grading materials are polymers filled essentially with SiC or ZnO and the conductivity is tuned by acting on the filler size distribution and ratio.…”

Section: Field Modelling In 200kv Joint Model In Transient Statementioning

confidence: 99%

Insulating Materials for HVDC Cable Accessories: Effects on the Electric Field in Nonstationary Situations

Teyssèdre¹,

Roy³

2022

IEEE Electr. Insul. Mag.

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With the move to DC technologies for power transmission, the computation of the field distribution in insulations has become a tricky task as the materials response is less well mastered as under ac stress. This is true for HVDC cables where essentially the conductivity law must be identified for the used insulating material. Cables represent a relatively simple case study. Accessories as cable joints and terminations are certainly more delicate to address. First, more than one material has to be handled; second the translational symmetry is broken, and tangential fields have to be computed in a situation of inhomogeneous temperature conditions. Finally, non-stationary situations have to be managed and modelled for accounting for on-line operations as well as surges seen by cables. Our purpose in this work is to give an overview on how far these transient phenomena are handled in the literature and to demonstrate how far the electrical as well as thermal properties of materials actually determine the field distributions.

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“…FDC composites with doped ZnO, SiC, or carbon allotrope fillers are widely used in wall bushing flanges, stator bar end of high-voltage generators, cable terminals, and gas-insulated switchgear/gas-insulated transmission line (GIL) insulators. , However, limited numbers of studies are available about their practical applications in high-voltage power modules, especially to reduce the electric field near the triple point. Through simulation, Ghassemi et al , applied FDC materials in power modules to suppress the electric field distortion at high temperature and high frequency and investigate the effect of the shape and electrical parameters of the FDC layer on electric field reduction.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Electric Field Distortion in High-Voltage Power Modules Utilizing Epoxy Resin/Silicon Carbide Whisker Composites with Field-Dependent Conductivity

Wang

Chen

Huang

et al. 2022

ACS Appl. Electron. Mater.

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This paper reports the performance of an epoxy resin/silicon carbide whisker (EP/SiCw) composite (1–5 wt %) as the field-dependent conductivity (FDC) layer for electric field reduction in the high-voltage power module. The experiments consist of a field emission scanning electron microscope (FESEM), thermal conductivity, Fourier transform infrared (FT-IR) spectroscopy, thermally stimulated discharge current (TSDC), space charge, DC conductivity, and dielectric spectroscopy. The DC conductivity and dielectric spectroscopy are used for DC and AC stationary electric field simulations, respectively. The electric field reduction of EP/SiCw composites in the power module is analyzed, and the void defect in the FDC layer is also identified. The observed percolation threshold of the EP/SiCw composites is 3 wt %, and the DC electric field near the triple point decreases significantly by 74.8% under 10 kV when a 5 wt % EP/SiCw composite is applied for the FDC layer. It was found that the efficient threshold operating frequency of the FDC layer is around 10 kHz. The FDC layer can significantly reduce the electric field under AC voltage below 10 kHz. Although the power loss with the FDC layer increases obviously without the FDC layer, it is still lower than 1 W at 1 MHz, which is negligible for industrial applications. Notably, the void in the FDC layer is identified by the slowly increased dielectric loss with the increase of frequency through dielectric spectroscopy simulation.

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Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Cited by 48 publications

References 133 publications

Aging assessment of insulating materials through broadband dielectric measurements: the appropriate frequency choice

Aging assessment of insulating materials through broadband dielectric measurements: the appropriate frequency choice

Insulating Materials for HVDC Cable Accessories: Effects on the Electric Field in Nonstationary Situations

Tailoring Electric Field Distortion in High-Voltage Power Modules Utilizing Epoxy Resin/Silicon Carbide Whisker Composites with Field-Dependent Conductivity

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