Abstract
The electrical tree initiation and propagation mechanism in XLPE (cross-linked polyethylene) with artificial voids filled with N 2 gas, O 2 gas or moisture was investigated. Treeing phenomena (pits, filamentary channel, voids, bridge, etc.) were observed and dielectric deterioration and breakdown mechanism were discussed. Oxidized region and rough electrode surface acted as the stress concentration point and from which electrical treeing deterioration processes were initiated after a tree inception time and started to propagate three-dimensionally toward the plane electrode. The width of the broken tree channel was 117 μm and the thickness of the tree was 1 to 30 μm. The dielectric breakdown occurred when a tree channel bridged the two electrodes.
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