Abstract
Grounded DC tree is a serious threat for the safe operation of XLPE cable. In this paper, growth properties of grounded DC electrical trees in XLPE under ±40kV DC voltage were investigated and anal...
Highlights
As the flexible DC transmission developed vigorously, cross-linked polyethylene (XLPE) power cables for the superior electrical performances have been widely applied in many electrical fields, especially in the new energy power transmission and long distance submarine transmission
The results showed that DC voltage polarity had a remarkable impact on the growth characteristics of grounded electrical tree
It had been reported that Kitani I with his work team studied the effect of space charge on the dc-tree initiation properties in PMMA [5], and Sekii Y’s team found the relationship between antioxidant and space charge with the initiation voltage of XLPE insulator [6]
Summary
As the flexible DC transmission developed vigorously, cross-linked polyethylene (XLPE) power cables for the superior electrical performances have been widely applied in many electrical fields, especially in the new energy power transmission and long distance submarine transmission. Studies on the initiation mechanism, growth properties and propagation morphology of the electrical trees in solid insulation have been carried out [2]. Compared to the ac environment, the dc-tree initiation voltage is greater and growth rate is lower than the ac-tree condition. It had been reported that Kitani I with his work team studied the effect of space charge on the dc-tree initiation properties in PMMA [5], and Sekii Y’s team found the relationship between antioxidant and space charge with the initiation voltage of XLPE insulator [6]. The related experiment has confirmed that tree initiation voltage under negative polarity is lower than positive polarity, the average positive-tree growth rate is higher than negative-tree’s [7]. We recognized the diverse effect of tree growth rate and propagation configuration on two kinds of polarities. The experimental result and mechanism could provide some references for the further research on the same subject
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