Abstract

Oil-immersed insulation paper (OIP) bushing is one of the most important equipment in power transmission and distribution systems. Moisture is one of the most serious factors that affect the insulation status of OIP bushing. In this paper, the OIP bushing was assumed to be in a stable and simplicity condition, and then the transient moisture distribution of capacitor core and its effects on the electric field were studied. First, by dissecting a 110 kV OIP bushing, the specific sizes for modelling were obtained. Afterwards, a moisture diffusion model for OIP bushing was established based on COMSOL Multiphysics software, and it was also verified by moisture diffusion experiment. Then, the moisture distribution for different conditions were obtained and analyzed. Finally, a model for the electric field of OIP bushing was established, and then the effects of moisture on the electric field were studied.

Highlights

  • Oil-immersed insulation paper (OIP) bushing provides a connection between the external high-voltage bus and the internal winding of oil-immersed transformer, which is one of the most important equipment in power transmission and distribution systems [1], [2]

  • Afterwards, a moisture diffusion model for OIP bushing was established based on COMSOL Multiphysics software, and it was verified by moisture diffusion experiment using another 110 kV OIP bushing

  • Since the effects of moisture on the electric field were caused by the changes of relative permittivity of oil-immersed insulation paper, the electric field of capacitor core with different moisture distributions can be simulated by changing the relative permittivity of insulation paper for the 42 non-overlapping calculation regions

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Summary

INTRODUCTION

Oil-immersed insulation paper (OIP) bushing provides a connection between the external high-voltage bus and the internal winding of oil-immersed transformer, which is one of the most important equipment in power transmission and distribution systems [1], [2]. A. MOISTURE DISTRIBUTION FOR DIFFERENT DIFFUSION TIME In this condition, the temperature set in the simulation was 50 ◦C, and the moisture contents of insulation oil were set to be 18 ppm. Since the effects of moisture on the electric field were caused by the changes of relative permittivity of oil-immersed insulation paper, the electric field of capacitor core with different moisture distributions can be simulated by changing the relative permittivity of insulation paper for the 42 non-overlapping calculation regions. Taking the OIP busing with the equilibrium moisture content of 4% as the example, Figure 15(b) shows the radial distribution of electric field at the flange for different moisture diffusion time. The changes of diffusion time do not have obvious effects on the electric field strength of the outmost electrode

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CONCLUSION

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