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In this paper, the deterioration investigation was carried on an ex-serviced 110 kV cross-linked polyethylene (XLPE) cable. XLPE sheets sliced from the cable insulation were taken as the test samples and the residual charge method was used as the diagnostic method. Two aluminum foils attached on the both sides of sample surface made the electrode constitution, between which the voltage was applied...
The effect of interfacial pressure on the insulation breakdown of the interface between a piece of XLPE and a piece of silicon rubber was investigated. A pair of plate-needle electrodes was sandwiched at the interface. A uniformly distributed weight was put on the sample with the interfacial pressure from 20 kN/cm2 to 300 kN/cm2. The breakdown voltage and the discharge current were recorded; the light...
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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