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In this paper, electrical treeing was investigated in room temperature vulcanized (RTV) silicone rubber (SiR) over a range of ambient temperatures. An ac voltage with a frequency of 50 Hz was applied between a needle-plate electrode to initiate the electrical tree at different ambient temperatures. Both the structures and the growth characteristics were observed by using a digital microscope system...
In this paper, XLPE laminate was employed as test sample to investigate the effect of cross-linking temperature on characteristics of electrical treeing. The samples were cross-linked at the temperature ranged from 150°C to 220°C by adding dicumyl peroxide (DCP) as cross-linking agent into low density polyethylene (LDPE). A pair of needle-plate electrodes was employed to initiate the tree by applying...
XLPE films were employed as test samples to investigate the effect of cross-linking temperature on space charge decay behavior. The samples were cross-linked with temperature ranged from 150°C to 180°C in thickness of 200 μm. Corona charging method was employed to introduce charges on sample surface, after which open-circuit decay test was carried out at 35°C with relative humidity of ~ 45%. Surface...
XLPE cables are widely used in urban distribution systems because of their excellent mechanical, heat and electrical properties. However, water tree, formed due to the existence of water and intense electric field, is one of the primary causes of aging breakdown. There used to be several methods, such as insulation impedance method and DC leakage current method for the detection of bridged water tree,...
In this paper, room temperature vulcanized (RTV) silicone rubber (SiR) was employed as test sample to investigate the tree aging phenomena and mechanism of silicone rubber under commercial voltage. The structures and growth characteristics of electrical tree in SiR were observed by using a digital camera. A new parameter, the treeing proportion is introduced to describe the electrical tree propagation...
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