Medium-voltage crosslinked polyethylene cable and repair method thereof

Abstract

The invention discloses a medium-voltage crosslinked polyethylene cable and a repair method thereof. In the case of not sawing off a cable conductor, a conductor shielding strip, a 10kV insulating thin film, a polytetrafluoroethylene strip and a copper strip are sequentially wrapped to simulate the crosslinking condition of crosslinked polyethylene, electricity or a gas furnace are used for heating, after the 10Kv insulating thin film is fully crosslinked with an original insulation structure to form a whole, the copper strip and the polytetrafluoroethylene are removed, the insulation structure is sprayed with insulation shielding material and wrapped with a semi-conductive strip, and then the copper strip, lining, armor layer and outer protective layer are sequentially repaired. The repair method of the medium-voltage crosslinked polyethylene cable has the advantages that the insulation repair simulates the production process in a plant, the repaired insulation structure and the cable body form a unified whole, the local discharging is eliminated, and the security and reliability are increased.

Description

technical field [0001] The invention belongs to the technical field of cable repair, and in particular relates to a 10kV medium-voltage XLPE cable and an insulation repair method thereof. Background technique [0002] The 10kV XLPE insulated medium voltage power cable has savage construction, overload operation, and defects in the cable itself. During operation, with the continuous growth of electric branches and water branches, strikes will occur first at the weakest point of insulation. Put on. Traditional repair process: saw off the three-phase cable cores, connect them with connecting pipes, and make intermediate joints; or wrap the corresponding strips according to the principle of layer-by-layer repair without sawing off the cores. The manufacturing process has the following deficiencies: 1. The butt joint of the connecting pipe destroys the cable body, which affects the mechanical strength and electrical performance, and is prone to overheating, posing safety hazards...

AI Technical Summary

Problems solved by technology

The manufacturing process has the following deficiencies: 1. The butt joint of the connecting pipe destroys the cable body, which affects the mechanical strength and electrical performance, and is prone to overheating, posing safety hazards; 2. The corresponding strips are wrapped layer by layer, and there will inevitably be residual The air gap will cause uneven distribution of the electric field, partial discharge, and potential safety hazards; 3. The material of the wrapping insulation layer is different from the XLPE insulation of the cable body, and partial discharge is prone to occur at the interface, posing potential safety hazards

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