Improved Flashover Characteristics of Surface Modified Epoxy by Ion Beam Treatment

Haq, Inzamam Ul; Wang, F.; Akram, Shakeel; Yan, Yunfei

doi:10.1109/icd53806.2022.9863603

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…It is revealed from the results that W θ of EP pure is larger than 90° which describes its hydrophobic nature according to Ref [27]. W θ for the insulation group EP ion‐20 declines to 74° and indicates that the surface of the insulation becomes hydrophilic [19, 28]. On the other hand, W θ for the insulation group EP sand‐R3 becomes larger than the 90° and is also higher than the W θ of the insulation group EP pure .…”

Section: Resultsmentioning

confidence: 99%

“…The flashover path of the insulation sample EP pure in a vacuum is usually caused because of the absorbed gas channel and emission of secondary electrons [30, 31]. The detailed mechanism of this above‐described process has already been discussed in our previous studies [20, 28, 29] The low magnitude of S g as illustrated in Figure 3 indicates that the surface of the insulation sample EP pure is highly resistive. The applied HVDC voltages on electrodes emit charges which reach the surface of the insulation and are caught by the deeper traps.…”

Section: Discussionmentioning

confidence: 97%

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Multi‐modified epoxy insulation with improved flashover threshold for HVDC applications

Haq

Wang

2023

IET Nanodielectrics

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The flashover threshold (Vflsh) of polymer insulations such as epoxy (EP) in HVDC systems can be augmented by modifying their surface with an appropriate treatment technology. For such purpose, several surface treatment methods such as ion beam, sandpaper and a combination of the two is introduced. Firstly, insulation samples with pure epoxy (EPpure), different ion beam treatment periods (EPion;10, 15, 20 min) and different roughness (EPsand; R1 = 4.23 μm, R2 = 6.34 μm, R3 = 9.21 μm) are prepared on the laboratory scale. Afterward, based on several characterisations, such as surface conductivity, mean surface roughness and potential distribution of these insulations, multi‐modified insulation (EPmulti = EPion‐20 + EPsand‐R3) is prepared. In the end, the Vflsh of each insulation group is measured and compared to examine the effectiveness of the proposed modifications. It is obtained that the Vflsh of the modified insulations augmented dramatically irrespective of the treatment method. The Vflsh of the insulation group EPmulti augmented by 52.66 % which is the highest improvement among all insulation groups. In short, the proposed surface modifications are effective and could be used as references to enhance the insulation strength of polymer dielectrics in HVDC systems.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

Multi‐modified epoxy insulation with improved flashover threshold for HVDC applications

Haq

Wang

2023

IET Nanodielectrics

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Mechanism exploration of ion-implanted epoxy on surface trap distribution: An approach to augment the vacuum flashover voltages

Haq,

Akram,

Fang

et al. 2024

Nanotechnology Reviews

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The augmentation of the epoxy (EP) resin surface to advance flashover performance has become a pivotal point of global interest. This research introduces a novel surface modification method and its mechanism for insulation materials. The research follows an electron cyclotron resonance ion implantation system to subject the surface of EP insulation to ion beams with diverse energies, i.e., 6, 10, 20, 40, 50, and 60 keV for a consistent time of 300 s at an angle of 90°. The experimental phase includes the DC flashover examination under negative polarity. Besides, the simulation phase includes the Monte Carlo model constructed using SRIM software to examine the range and distribution of bombarded ions in the targeted insulation. Results reveal that the flashover properties are affected by the surface potential, surface conductivity, trap distribution, water contact angle, and elemental composition. Likewise, based on the outcomes and theoretical point of view, it is revealed that the bombardment of energetic ions enhances the trap depth, assisting in a reduction in surface conductivity, confining the surface charge movements, and extensively suppressing the secondary electron emission yield. Also, the enhanced trap depth induces homo-charge formation near triple junctions. Synergistically, the factors contribute to high flashover voltages.

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Improved Flashover Characteristics of Surface Modified Epoxy by Ion Beam Treatment

Cited by 2 publications

References 20 publications

Multi‐modified epoxy insulation with improved flashover threshold for HVDC applications

Multi‐modified epoxy insulation with improved flashover threshold for HVDC applications

Mechanism exploration of ion-implanted epoxy on surface trap distribution: An approach to augment the vacuum flashover voltages

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