Liquid repairing agent for improving high-voltage and ultra-high-voltage cable water blocking buffer with electric corrosion and its preparation method, filling equipment and filling method

Abstract

The invention discloses a liquid repairing agent for improving electric corrosion of a water-blocking buffer zone of a high-voltage ultra-high voltage cable, a preparation method, a filling device and a filling method, and belongs to the technical field of cable water-blocking buffer zone repairing. The technical scheme is as follows: the mass ratio of the following components is: polydimethylsiloxane 40%-80%; graphite particles 5%-40%; silica spheres 10%-20%; silane coupling agent 1% ‑3%; put graphite particles, silica spheres, and silane coupling agent in a stirrer, add absolute ethanol and stir thoroughly, dry to obtain a mixed powder, and then add polydimethylsiloxane to the mixed powder , placed in a three-roll mill to grind and disperse to obtain a liquid repair agent. Fill the liquid repair agent into the gap between the corrugated aluminum sheath and the insulated wire core through the filling equipment. The invention can obviously improve the electric corrosion condition of the cable water-blocking buffer belt, has simple construction, short period, low environmental requirements, can greatly reduce the cable repair cost, and prolong the cable life.

Description

technical field [0001] The invention belongs to the technical field of repairing cable water-blocking buffer strips, and in particular relates to a liquid repair agent for improving electric corrosion of high-voltage and ultra-high-voltage cable water-blocking buffer strips, a preparation method thereof, filling equipment and a filling method. Background technique [0002] During the processing and storage of high-voltage and extra-high voltage cables of 110kV and above, moisture will enter the water-blocking buffer zone, causing the expansion powder of the water-blocking buffer zone to absorb moisture and expand, and there will be partial separation between the two layers of semi-conductive non-woven fabrics in the water-blocking buffer zone. Increase the resistance of the water-blocking buffer zone. However, in a cable that has been in operation or has galvanic corrosion of the water-blocking buffer zone, due to the increase in the resistance of the water-blocking buffer z...

AI Technical Summary

Problems solved by technology

[0002] During the processing and storage of high-voltage and extra-high voltage cables of 110kV and above, moisture will enter the water-blocking buffer zone, causing the expansion powder of the water-blocking buffer zone to absorb moisture and expand, and there will be partial separation between the two layers of semi-conductive non-woven fabrics in the water-blocking buffer zone. Increase the resistance of the water-blocking buffer zone

However, in a cable that has been in operation or has galvanic corrosion of the water-blocking buffer zone, due to the increase in the resistance of the water-blocking buffer zone, a potential difference is formed between the cable insulation shielding layer and the corrugated aluminum sheath. This potential difference is not enough to cause discharge, but there is potential Poor, current will flow through the resistor, the resistor will heat up, and eventually the heat will partially destroy the water-blocking buffer zone, and in severe cases, it will cause cable breakdown

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