Contribution of polymer microstructure to space charge, dielectric properties and electrical conduction

Guffond, Raphaël; Combessis, Anthony; Holé, Stephane

doi:10.1109/ceidp.2016.7785655

Cited by 4 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For rough abraded, abraded, and smooth abraded surfaces, higher mean charge densities were measured as compared with those obtained for backside surfaces, as can be seen in Figure 8B. This fact might indicate electric field thresholds at approximately 30, 36, and 44 kV/mm, respectively, which can be A B The net charge density decreases for most samples with the poling electric field, which could be an effect related to the sample morphology, as seen in Figure 8 [11,13]. Data for remolded samples deviate from anticipated behavior, which predicts low injection rates.…”

Section: Impact Of Poling Field Strengthmentioning

confidence: 57%

“…Additional measurements that are not shown in Figure 7 are also included in Figure 8. The net charge density decreases for most samples with the poling electric field, which could be an effect related to the sample morphology, as seen in Figure 8 [11,13]. Data for remolded samples deviate from anticipated behavior, which predicts low injection rates.…”

Section: Impact Of Poling Field Strengthmentioning

confidence: 90%

“…In this work, cable peelings of approximately 500 μm thickness were used. The setup and method has been previously developed by Guffond et al [11], although for slightly different and thicker specimens. The peelings were placed between two semiconducting rubber electrodes, using a small amount of dielectric grease for improving electrical and acoustic contact.…”

Section: Space Charge Measurementmentioning

confidence: 99%

“…From Figure 6, it seems that negative charge carriers exhibit lower injection and transport (detrapping and/or hopping transport) barriers than positive carriers. This effect could be attributed to semi-crystalline structure within the material, as the crystalline and amorphous phases are known to favour, respectively, hole and electron transport [11,13].…”

Section: Impact Of Sample Orientation and Polaritymentioning

confidence: 99%

See 3 more Smart Citations

Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part I—Experimental Study and Charge Injection Hypothesis

et al. 2020

View full text Add to dashboard Cite

On-site installation of accessories on extruded polymeric high voltage cables in a common practice. The procedure requires the shaping of the physical interface between the cable insulation surface and the pre-molded accessory body. On such interfaces, rough surfaces should be avoided in order to limit space charge accumulation in the insulation, which affects the cable performance by reducing insulation life-time, creating conditions for local field enhancement, and, respectively, the formation of possible breakdown path e.g. by electrical treeing. Space charge measurements on cable insulation peelings were undertaken to assess the space charge injection and accumulation on interfaces with varying degrees of surface roughness in order to improve understanding on this subject. The results of the measurements confirm the hypothesis regarding the enhancement of charge injection from rough surfaces when electric field strength exceeds a certain level. The accumulated charge density in the material is shown to strongly depend on the field strength and temperature in both polarization and subsequent depolarization measurements. These results emphasize that a bipolar charge transport model that incorporates field and temperature dependencies of charge injection, trapping, detrapping, and recombination processes needs to be adopted to accurately describe the observed electric conduction phenomena.

show abstract

Section: Impact Of Poling Field Strengthmentioning

confidence: 57%

Section: Impact Of Poling Field Strengthmentioning

confidence: 90%

Section: Space Charge Measurementmentioning

confidence: 99%

Section: Impact Of Sample Orientation and Polaritymentioning

confidence: 99%

See 2 more Smart Citations

Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part I—Experimental Study and Charge Injection Hypothesis

et al. 2020

View full text Add to dashboard Cite

show abstract

“…At the lower range of frequencies (below 1 Hz), a significant rise is observed in both parts of permittivity for the unfilled blend and Sample 0. This phenomenon is generally related to the occurrence of interfacial polarizations or Maxwell-Wagner (space charge) relaxations which can lead to breakdown under high fields [49,50]. It is clear that while the reference samples exhibit a significant amount of these relaxations, the introduction of either modifying agent to the NPs results in a decrease in this low frequency rise, suggesting lower susceptibility to space charge formation as a result of filler surface modification.…”

Section: Broadband Dielectric Spectroscopy (Bds)mentioning

confidence: 99%

Deposition of Ureido and Methacrylate Functionalities Onto Silica Nanoparticles and its Effect on the Properties of Polypropylene-Based Nanodielectrics

Mahtabani¹,

Niittymaki

Anyszka

et al. 2021

IEEE Access

View full text Add to dashboard Cite

Surface modification of nanoparticles is often utilized to tailor the interfacial properties in dielectric nanocomposites. Introducing different functional groups to the nanoparticles' surface may induce localized states (traps) that can enhance the dielectric performance of the material depending on their density and energy levels. Furthermore, surface modification of the filler can affect the dispersion quality and crystallization of the nanocomposites which can ultimately alter the dielectric response of the material. In this study, functionalization of silica nanoparticles is demonstrated using 3-(trimethoxysilyl)propyl methacrylate (TMPM) and 1-[3-(trimethoxysilyl)propyl]urea (TMPU) as modifying agents. The effect of such modifications on the crystallization behavior, dispersion quality of the nanoparticles, as well as charge trapping and transport under a medium DC field is studied in nanocomposites based on polypropylene (PP)/ethylene-octene-copolymer (EOC) blends at 1% and 5% of filler concentrations. The results show that both ureido and methacrylate functional groups introduce localized states, but with different energy levels. Nitrogen containing ureido groups in TMPU tend to introduce deeper traps to the filler-polymer interfaces, compared to the methacrylate silane modification. Comparing the two types of surface functionalization, the ureido-functionalized silica resulted in a suppression of space charge formation at the interfaces under a medium DC electric field, despite the relatively larger mean cluster size of nanoparticles.

show abstract

Considerations on the impact of material mesostructure on charge injection at cable interfaces

Doedens¹,

Jarvid²

2020

IEEE Electr. Insul. Mag.

View full text Add to dashboard Cite

Contribution of polymer microstructure to space charge, dielectric properties and electrical conduction

Cited by 4 publications

References 9 publications

Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part I—Experimental Study and Charge Injection Hypothesis

Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part I—Experimental Study and Charge Injection Hypothesis

Deposition of Ureido and Methacrylate Functionalities Onto Silica Nanoparticles and its Effect on the Properties of Polypropylene-Based Nanodielectrics

Considerations on the impact of material mesostructure on charge injection at cable interfaces

Contact Info

Product

Resources

About