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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,...
Experience with electrical diagnostic and high-potential tests, performed at the terminals of unshielded cables in older nuclear and thermal plants is presented. The three basic types of cable-low- and high-voltage power cables, control cables and instrumentation cables-that are important to the reliable operation of a generating station and large industrial plants are described, and their aging mechanisms...
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