俗称电树电缆在运行过程中绝缘易造成老化破坏主要是由于绝缘内部放电产生细微开裂形成细小的通道其通道内空管壁上有放电产生的碳粒痕迹呈冬天树枝状分支数少而清晰
交联聚乙烯电缆；电树枝化；升压速度；树枝形态；分形维。
XLPE cable; electrical treeing; boosting rate; tree morphology; fractal dimension.
随着电网电压等级的提高，电缆的电树枝老化问题愈显突出。
As to higher voltage rating polymer cables, electrical tree aging problem is more outstanding.
结果表明，机械应力下疲劳强度的劣化是低温电树枝化的重要因素。超高分子量聚乙烯具有低温性能好。
The test results with the needle-plane electrode system under ac voltage at 77 K indicate that the fatigue break in UHMW-PE under mechanical forces during the electrical treeing is a critical factor.
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