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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

A technology for filling equipment and repairing agents, applied in the direction of insulated cables, cables, conductors, etc., can solve the problems of increased resistance of the water-blocking buffer zone, damage of the water-blocking buffer zone, cable breakdown, etc., to enhance the conductivity and reduce the repair Cost, effect of extending cable life

Active Publication Date: 2022-04-22
QINGDAO HANHE CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • 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
  • 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
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1

[0034] The composition ratio of the liquid repair agent for improving the electric corrosion of the water-blocking buffer belt of high-voltage and ultra-high-voltage cables in Examples 1-4 and Comparative Examples is shown in Table 1:

[0035] Table 1

[0036]

[0037] After the above components are weighed in proportion, first place graphite particles, silica spheres, and silane coupling agent in a stirrer, add absolute ethanol and stir thoroughly, and then place them in a drying room at 60-70°C for 4-8 hours. , to obtain a mixed powder, add polydimethylsiloxane to the mixed powder, place it in a three-roll mill for grinding and dispersing, and obtain a liquid restoration agent. In the preparation process, the graphite particles of Comparative Example 1 have poor dispersion and are easy to agglomerate, while the graphite particles of Examples 1-4 have good dispersion and are not easy to agglomerate. This is because the addition of a silane coupling agent can form a thin fi...

Embodiment 5

[0039] This embodiment provides a filling device for filling the liquid restoration agent of Embodiment 1-4, including a filling device body 9, a device connecting pipe 8 and a sealing fixture, and the sealing fixture includes a first sealing fixture and a second sealing fixture. The sealing fixture, the first sealing fixture and the second sealing fixture both include a semicircular shell, and the two sides of the shell are respectively provided with connecting plates 5, and the first sealing fixture and the second sealing fixture are connected by threads provided on the connecting plate 5, The casing of the first sealing fixture is provided with a repairing agent liquid inlet and outlet 4;

[0040] The method of use is:

[0041] S1: Strip off the cable outer sheath 1 with a length of 350-450mm at both ends of the cable that has been running or has undergone electrical corrosion of the water-blocking buffer belt, and exposes the wrinkled aluminum sheath 2;

[0042] S2: Along...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K3/04C08K7/18C08K3/36C08K9/06H01B7/28H01B7/285
CPCC08K3/04C08K7/18C08K9/06C08K3/36H01B7/2806H01B7/285C08K2201/011C08K2201/003C08L83/04
Inventor 陈沛云曲国安赵新院王长春王会康高琳孙鹤张峰
Owner QINGDAO HANHE CABLE
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