Pre-formed Wire Repair Method
The repair process for damaged steel-cored aluminum conductors in 10kV lines, as described in document armour rod, primarily follows the relevant regulations of the "Construction and Acceptance Specifications for Overhead Power Lines of 35kV and Below Electrical Installation Engineering." Depending on the degree of damage to the conductor, the following repair methods are mainly used: sanding with 0-grade sandpaper, winding repair, repair with repair sleeves, and splicing with straight connectors. From the perspective of repair methods, sanding with 0-grade sandpaper and winding repair are relatively quick. However, these two methods are only suitable for repairing steel-cored aluminum conductors where the strength loss does not exceed 5% of the total tensile strength, and the cross-sectional area damage does not exceed 7% of the total cross-sectional area of the conductive part, which has considerable limitations. In reality, after a short circuit involving multiple conductors, the damaged area of the conductor is generally greater than 7%. Therefore, we statistically analyzed the total number of conductor repairs throughout the year. The number of faults with conductor damage exceeding 7% of the cross-sectional area was 15, accounting for approximately 60% of the total faults. For conductors with damage exceeding 7%, the main repair methods used are repair with repair sleeves and splicing with straight connectors after cutting the damaged section. However, these two methods require more tools and labor, and the construction process is more complicated, resulting in longer construction times.
