Periodic grounded DC tree in XLPE under different DC prestressing times

In this study, periodic grounded DC trees in cross-linked polyethylene (XLPE) under various DC prestressing times are investigated in the temperature range of 20-80 °C. Space charge behaviors in the samples during DC prestressing are simulated based on the bipolar charge transport model. The results reveal that the DC prestressing time has different effects on the tree growth at different temperatures, which is because that the space charge behavior in the sample during DC prestressing is closely related to the DC prestressing time and the temperature, and it has both promotion effect and impedance effect on the tree growth. The electrical tree characteristics are discussed in detail combined with the space charge behaviors.