Abstract
Surface charge accumulation on insulators under high dc voltage is a major factor that may lead to the reduction of insulation levels in gas insulated devices. In this paper, disc insulators made of Al2O3-filled epoxy resin were surface fluorinated using a F2/N2 mixture (12.5% F2) at 50 °C and 0.1 MPa for different durations of 15 min, 30 min and 60 min. A dc voltage was applied to the insulator for 30 min and the charge density on its surface was measured by an electrostatic probe. The results revealed significant lower surface charge densities on the fluorinated insulators in comparison with the original one. Surface conductivity measurements indicated a higher surface conductivity by over three orders of magnitude after fluorination, which would allow the charges to transfer along the surface and thus may suppress their accumulation. Further, attenuated total reflection infrared analysis and surface morphology observations of the samples revealed that the introduction of fluoride groups altered the surface physicochemical properties. These structure changes, especially the physical defects reduced the depth of charge traps in the surface layer, which was verified by the measurement of energy distributions of the electron and hole traps based on the isothermal current theory. The results in this paper demonstrate that fluorination can be a promising and effective method to suppress surface charge accumulation on epoxy insulators in gas insulated devices.
Highlights
Epoxy resin is one of the most important matrix materials for the preparation of composite materials, and mineral filled epoxy resins are widely used as insulating, encapsulating and structural materials in power, electronic and aerospace industries
These structure changes, especially the physical defects reduced the depth of charge traps in the surface layer, which was verified by the measurement of energy distributions of the electron and hole traps based on the isothermal current theory
This work has shown a significant lower density of accumulated surface charges on the fluorinated insulators made of Al2O3-filled epoxy resin under dc voltage
Summary
Epoxy resin is one of the most important matrix materials for the preparation of composite materials, and mineral filled epoxy resins are widely used as insulating, encapsulating and structural materials in power, electronic and aerospace industries. Surface charge decay on the insulator mainly depends on two contributions[4,5]: one is the bulk current driven by the normal component of the electric field; the other is the divergence of the surface current flowing along the gas-solid interface, driven by the tangential component of the electric field From these two aspects, considerable efforts have been made to suppress the charge accumulation.
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