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Moisture effect on surface fluorinated epoxy resin for high-voltage DC applications

Moisture effect on surface fluorinated epoxy resin for high-voltage DC applications
Moisture effect on surface fluorinated epoxy resin for high-voltage DC applications
Charge accumulation under high-voltage DC is a major concern in the transmission system as its presence distorts the local electric field. By performing chemical treatment on the polymeric insulation via fluorination process, the charge dynamics of the treated material can be modified. Surface fluorination treatment has been proven to be an effective tool to enhance the dielectric properties. The treatment slightly improves the surface conductivity value and enhances the surface potential decay rate, which helps to prevent the accumulation of surface charge and consequently improve the breakdown strength of epoxy samples. However, the authors suspected the introduction of a fluorinated layer on top of the epoxy sample may have the capacity to absorb moisture from the environment. The increase in the surface conductivity by the fluorination treatment may not come from the fluorine layer itself, but rather from the absorbed moisture in the surface layer. The loss of moisture from the surface may lead to a dip in dielectric performance of the treated materials. Hence, a study on the moisture effect on the surface fluorinated epoxy resin was designed. The fluorinated samples were characterised by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX) to analyse the morphology as well as the concentration of elements in the treated materials. The samples then were dried in vacuum oven at 105°C and/or inside nitrogen gas chamber at room temperature for 24 hours to forcefully dry out the absorbed surface moisture. The measurements of surface DC conductivity and surface potential decay were taken before and after the drying process. It has been found that the fluorination treatment on epoxy resins did give rise to high moisture content on the surface which plays an important contribution towards the dielectric enhancement properties.
1148-1155
Mohamad, A.
da455387-212f-44a7-95a5-69f694227ebb
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhang, Y.
c6568601-0e54-46d9-996e-564abd37fb83
An, Z
5a2b0c17-475a-43c8-9069-6f85c07b139f
Mohamad, A.
da455387-212f-44a7-95a5-69f694227ebb
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhang, Y.
c6568601-0e54-46d9-996e-564abd37fb83
An, Z
5a2b0c17-475a-43c8-9069-6f85c07b139f

Mohamad, A., Chen, G., Zhang, Y. and An, Z (2016) Moisture effect on surface fluorinated epoxy resin for high-voltage DC applications. IEEE Transactions on Dielectrics and Electrical Insulation, 23 (2), 1148-1155. (doi:10.1109/TDEI.2015.005437).

Record type: Article

Abstract

Charge accumulation under high-voltage DC is a major concern in the transmission system as its presence distorts the local electric field. By performing chemical treatment on the polymeric insulation via fluorination process, the charge dynamics of the treated material can be modified. Surface fluorination treatment has been proven to be an effective tool to enhance the dielectric properties. The treatment slightly improves the surface conductivity value and enhances the surface potential decay rate, which helps to prevent the accumulation of surface charge and consequently improve the breakdown strength of epoxy samples. However, the authors suspected the introduction of a fluorinated layer on top of the epoxy sample may have the capacity to absorb moisture from the environment. The increase in the surface conductivity by the fluorination treatment may not come from the fluorine layer itself, but rather from the absorbed moisture in the surface layer. The loss of moisture from the surface may lead to a dip in dielectric performance of the treated materials. Hence, a study on the moisture effect on the surface fluorinated epoxy resin was designed. The fluorinated samples were characterised by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX) to analyse the morphology as well as the concentration of elements in the treated materials. The samples then were dried in vacuum oven at 105°C and/or inside nitrogen gas chamber at room temperature for 24 hours to forcefully dry out the absorbed surface moisture. The measurements of surface DC conductivity and surface potential decay were taken before and after the drying process. It has been found that the fluorination treatment on epoxy resins did give rise to high moisture content on the surface which plays an important contribution towards the dielectric enhancement properties.

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Accepted/In Press date: 19 October 2015
Published date: April 2016
Organisations: EEE

Identifiers

Local EPrints ID: 402983
URI: http://eprints.soton.ac.uk/id/eprint/402983
PURE UUID: c7f2f7a8-5bb6-4f96-b15f-346fba791582

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Date deposited: 21 Nov 2016 14:16
Last modified: 14 Sep 2021 17:27

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