Surface potential decay measurements on fluorinated polymeric insulation for high voltage DC applications

Mohamad, A.; Chen, G.; Zhang, Yu Zhong; An, Z.

doi:10.1109/ceidp.2013.6747065

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…Interestingly, the increase in surface conductivity enables trapped surface charges to move away faster and, as a result, suppresses the surface charge accumulation from distorting the local electric field [186]. Hence, the increasing trend in DC surface flashover strength over fluorination time with the highest surface breakdown strength is observed for sample F180.…”

Section: Resultsmentioning

confidence: 77%

Surface fluorinated epoxy resin for high voltage DC application

Mohamad

Chen

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Charge build up under high voltage DC is a significant concern in the transmission system as its presence may distort the local electric field. By chemically treat polymeric insulation via directfluorination, and plasma enhanced fluorination process, the charge transport characteristics of the material can be modified. In doing so, excellent surface properties similar to those of fluoropolymers can be attained without compromising the bulk properties of the original polymeric insulation. The change in chemical components at the surface of polymeric insulation should lead to a corresponding change in dielectric properties at the surface and consequently may suppress the occurrences of charge build up. In this research, epoxy resin samples with various surface fluorinating conditions were formulated and treated. The samples then were characterised by SEM and EDX analysis, Raman spectroscopy, and DC surface conductivity measurements. To further explain the effects of fluorination treatment, modelling of the electric field and current density distribution had been carried out. Surface potential decay tests from corona discharge, as well as PEA measurements, show that there is a significant change in decay characteristics with the introduction of surface fluorinated layer. The decay mechanisms responsible for the observed

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Section: Resultsmentioning

confidence: 77%

Surface fluorinated epoxy resin for high voltage DC application

Mohamad

Chen

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…The conductivity is higher with longer time duration of fluorination treatment. Interestingly, increase in surface conductivity enables trapped surface charges to leak away faster and, as a result, suppresses the surface charge accumulation from distorting the local electric field [16]. Hence, the increasing trend in DC surface flashover strength over fluorination time with the highest surface breakdown strength is observed in sample F180.…”

Section: Resultsmentioning

confidence: 96%

Influence of fluorination time on surface flashover of epoxy in insulating gas

Mohamad

Chen

2015

2015 IEEE Electrical Insulation Conference (EIC)

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Abstract-The accumulation of charges on polymeric insulation under high voltage DC stress is a major concern in the transmission system as its formation distorts the local electric field and has an adverse impact on the electrical performance. By undergoing fluorination treatment on the insulation, improved surface properties similar to fluoropolymers can be attained without changing the bulk properties of the original material. The change in chemical components at the surface of polymeric insulation should lead to a corresponding change in electrical properties at the surface and thus can suppress charge build up. Previous research on surface flashover on fluorinated epoxy resin at atmospheric condition shows a significant improvement in flashover strength. In this paper, the authors investigated the effect of different degree of fluorination treatment on cast epoxy resin on suppressing surface charge accumulation and its contribution towards the improvement in surface breakdown strength. In comparison to previous research, it has been found that there is an optimum time duration of fluorination treatment which improves the surface breakdown strength of epoxy spacer. The mechanisms that govern the effect of fluorination treatment on surface flashover were discussed.

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“…(1) The surface conductivity is increased dramatically with short fluorination time (within 30mins), while it decreased when the samples are treated after long term fluorination, except for results obtained by G.Chen [27,28]. (2) The decreasing rate of conductivity with fluorination time duration accelerates with increase of temperatures.…”

Section: Analysis and Discussionmentioning

confidence: 95%

“…G. Chen et al employed the same fluorination treatment method on the epoxy films [27][28][29]. Compared with Z.…”

Section: Researches In University Of Southamptonmentioning

confidence: 99%

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Gas–solid interface charge tailoring techniques: what we grasped and where to go

Zhang¹,

Wang²,

Teyssèdre³

et al. 2020

Nanotechnology

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Charging of insulators modifies local electric field distribution and increases potential threat to the safety of the gas insulated equipment. In this paper, surface charge tailoring techniques are classified and reviewed by introducing a Dam-flood model. Technical solutions of different charge tailoring methods are compared and discussed. The outlook of potential solutions to suppress charge accumulation is recommended and discussed based on industrial consideration.This paper serves as a guide handbook for engineers and researchers into the study of charge tailoring methods.Meanwhile, we hope that the content of this paper could shed some lights upon charge-free insulators to promote the industrial application of HVDC GIL/GIS.

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Surface potential decay measurements on fluorinated polymeric insulation for high voltage DC applications

Cited by 7 publications

References 7 publications

Surface fluorinated epoxy resin for high voltage DC application

Surface fluorinated epoxy resin for high voltage DC application

Influence of fluorination time on surface flashover of epoxy in insulating gas

Gas–solid interface charge tailoring techniques: what we grasped and where to go

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