A method for manufacturing a water-permeable self-positioning cable

By constructing a coaxial monitoring circuit with a built-in sensing unit and a semi-conductive graphite layer in the cable, the problems of early warning and accurate location of cable water seepage monitoring are solved, achieving rapid response and high-precision location of damage points, avoiding faults caused by water intrusion, and without damaging the cable structure.

CN122136101APending Publication Date: 2026-06-02JIANGSU HENGTONG POWER CABLE
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU HENGTONG POWER CABLE
Filing Date
2026-04-21
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing cable water seepage monitoring solutions cannot provide early warning of sheath damage or accurately locate the damage point. Furthermore, existing technical solutions suffer from problems such as delayed response, inaccurate positioning, high cost, and structural damage.

Method used

Multiple metal monofilaments are drawn and twisted together to form a conductor, an insulation layer is extruded on the outside and twisted into a cable core, and a wrapping tape layer is wrapped around the outside of the cable core. Tinned copper wire is used as a sensing and monitoring conductor, coated with a hydrophilic insulation thin layer and spirally wound around the wrapping tape layer. The outer sheath layer is coated with graphite conductive paste to form a semi-conductive graphite layer, which constitutes a coaxial monitoring circuit. End treatment and functional testing are then performed.

Benefits of technology

It enables real-time online early warning and meter-level location of cable water seepage, avoiding conductor corrosion and insulation aging caused by water intrusion. It has a fast response speed, accurate positioning, and does not affect the main power transmission structure of the cable, thus reducing production and modification costs.

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Abstract

This invention relates to a method for manufacturing a water-permeable self-locating cable. The method includes: preparing conductors and insulated cores, completing cabling and wrapping; preparing a sensing unit with a hydrophilic insulating thin layer on its surface, spirally winding it around the wrapping layer at a constant pitch and extruding it onto an outer sheath; coating the surface of the outer sheath with a graphite conductive paste and curing it to form a semi-conductive graphite layer; and obtaining the finished product through end treatment, lead wire connection, and finished product testing. This invention, through the coaxial monitoring circuit formed by the built-in sensing unit and the semi-conductive graphite layer, can achieve real-time online early warning of water permeation in cables without metal shielding and precise location of meter-level damage points. The monitoring circuit is completely independent of the main power transmission circuit, has strong anti-electromagnetic interference capability, high signal-to-noise ratio, and can effectively avoid serious cable failures caused by long-term water intrusion, significantly extending the cable's service life.
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