Electric Field Finite Element Analysis of XLPE Insulation Air Gap Defect of 110 kV Submarine Cable
In order to analyze the distribution of electric field of air-gap defects in submarine cable insulation,a finite ele-ment model of electric field of air-gap defects in the same radial direction and at different positions of submarine cable insu-lation layer is established in this paper.Maxwell transient electric field analysis method was used to calculate the electric field distribution in the insulation layer and the air gap during the normal operation of submarine cable and the air gap defect,and then the electric field distribution in the insulation layer and the air gap defect were compared and analyzed,and the relation function between the maximum electric field inside the insulation and the maximum electric field inside the air gap defect and the position of the air gap defect was obtained.The results showed that when there were air gap defects in submarine cables,the elec-tric field inside insulation reached the largest,which was larger than the electric field inside air gap defects.The maximum electric field inside insulation and air gap defects was monotonically decreasing with the radial position of air gap.
submarine cableinsulation air gappartial dischargefinite elementelectric field strength