Conductors and lightning arresters are subjected to the mechanical action of various forces, as well as the thermal action of load current, short-circuit current and lightning current, as well as electrochemical corrosion and chemical corrosion damage, which may cause damage to the conductors. Common defects of conductors and lightning conductors include broken strands, loose strands, joint heating, arc burns, rust, corrosion, burrs, broken wires and so on.
In order to deal with defects, the following methods are generally adopted:
1．Polish corners and burrs
In the course of laying-out or transportation, the edges and burrs caused by the collision or dragging of the lightning conductor with the hard object, and the damaged section area of the steel-cored aluminum strand, the steel-cored aluminum alloy strand or the lightning conductor is less than 5% of the section area of the conductive part, and the strength loss is less than 4%, cannot be repaired, and can be made with 0 sand paper along the strand. Wipe the direction in a smooth manner and clean it thoroughly with abrasive cloth.
2．Winding reinforcement method
When the damage of the conductor at the same section exceeds the polishing treatment standard and the damage section area is 7% or less of the conductive section area, the same metal single strand wire (conductor diameter should not be less than 2 mm, galvanized iron wire for steel-core aluminum strand) should be used to wound the damaged section, the winding center should be located at the most serious damage, and the winding should be tight. The damaged part should be covered with a length of not less than 100mm, and both ends of the damage should exceed 30mm.
When the conductor damage cross section is 7% to 25% of the section area of the conductive part, the repair method is adopted.
When repairing, the length of laying should exceed the damage part, and the length of winding at both ends should not be less than 100 mm.
4．Sawing and reconnection
The method of wire connection is determined according to the type and specification of the conductor.
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