A Repairing Method for Single-phase Fault of XLPE Cable

Abstract

The invention discloses a repair method of the single-phase fault of a cross-linked polyethylene cable. The method includes the following steps that: 1) the fault part of a fault phase is removed, and undamaged single-phase parts at two sides are preserved; 2) the conductor shielding layers, semiconductor layers and cross-linked polyethylene insulation layers of the undamaged single-phase parts are stripped off, conductor parts are exposed; 3) the conductor parts of the undamaged single-phase parts at two sides are connected through using a repair connection tube; 4) insulation recovery is carried out through using a cold shrinkable insulation tube, a semi-conduction belt and silicone grease paste; 5) the end orifices of the insulation tube are coated with waterproof paint, so that waterproofing treatment can be carried out; 6) the repair connection tube is wrapped with a galvanized shielding copper mesh; 7) constant-force springs are installed at two ends of the galvanized shielding copper mesh; 8) the galvanized shielding copper mesh is wrapped with a thermal shrinkable inner sheath; and 9) the thermal shrinkable inner sheath is wrapped with an armoring mesh. A cable repaired by the repair method has good sealing performance and good running conditions. With the method adopted, time and money can be saved, and the power supply reliability of a medium and low-voltage transmission system can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of electric equipment repair, in particular to a method for repairing a single-phase fault of a cross-linked polyethylene cable. Background technique [0002] XLPE cables have high voltage, high electric field strength, complex structure and difficult repair. [0003] After a single-phase fault occurs in an XLPE cable, the existing method is to remove the faulty part, replace a section of cable, and then re-make two sets of three-phase cable joints to connect them; this method not only consumes more consumables, but also requires more human and time costs. If it is repaired in the urban area, the municipal management department needs to coordinate the compensation and approval of the broken road. In some key road sections or traffic congestion areas, daytime construction is often not allowed, and the construction procedures are very cumbersome. [0004] According to statistics, a power supply company had 8...

AI Technical Summary

Problems solved by technology

According to statistics, 90% of the external force damage only causes single-phase damage to the cable, and 76% of them only cause insulation scratches, resulting in a decrease in insulation strength, and then grounding.

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