Background: Electrical trees can affect the distribution of electric field and space charge
in cross-linked polyethylene (XLPE) cables, and play an important role in insulation aging and
breakdown of cables. Therefore, it is important to study the influence of electrical trees in cables.
Methods: In this study, the finite element method of second-order tetrahedral element and electromagnetic
theory method is used for calculation. A model of XLPE cable with three-dimensional
electrical trees is taken as an example for calculation.
Results: The results show that the longer the trunk length is, the greater the electric field intensity at
the end of the branch is; the farther the electrical trees are from the insulation side of the high voltage,
the more the electric field intensity of each location decreases.
Conclusion: With the increase of the resistivity of the trees, the electric field intensity and charge
density tend to be stable at the end of the tree.