NUMERICAL MODELING OF ELECTRIC FIELD AND POTENTIAL DISTRIBUTION IN WATER TREED INSULATION LAYER OF HV POWER CABLES
DOI:
https://doi.org/10.24867/22BE02VisnjicKeywords:
HV cable, electric field strength vector, electric scalar potential, water and electric treeingAbstract
This paper analyses the impact of irregularities in a solid dielectric of the high-voltage cable in the form of voids and impurities. It also analyses how the electric and water treeing appearance affects the distribution of the electric field and electric scalar potential inside the cable. All calculations were performed applying the COMSOL Multiphysics software package based on finite element method. For analysis purposes, a model of a single-core cable line 64/110 kV type A2XS(FL)2Y (old identification XHE 49-A) was applied. The obtained results showed that the occurrence of water treeing leads to significant changes in the distribution of electric field and electric scalar potential inside the cable. A drastic increase in the electric field at the tips of the branches was observed, which is a prerequisite for further degradation of the insulation, which ultimately leads to breakdown.
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