Abstract
Compared with ordinary PVC cables, crosslinked polyethylene insulated cables have been used widely because of their high load capacity, strong overload capacity and long service life.However, in cable production process, small bubbles may appear in XLPE layer, and the bubble defects can cause distortion to the electric field distribution and temperature distribution of the cable.This article simulates electric field and temperature distribution characteristics of bubbles in different sizes and locations in 110kV XLPE cables by COMSOL.The simulation results show that when the bubble appears in the XLPE layer, the electric field intensity near the interface between the bubble and XLPE decreases sharply, and in comparison with the condition that there is no bubble, the electric field intensity is greater.Meanwhile, the closer bubble get to the outside of the XLPE layer, the smaller the maximum field intensity will be.Also,the internal temperature of the bubble in the XLPE layer shows a linear ting trend.
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