Power cable water inlet sensing device based on stress enhancement structure

Abstract

The invention discloses a power cable water inlet sensing device based on a stress enhancement structure. The sensing device comprises three layers of structures, namely a sensing optical fiber, a water absorption expansion material and a stress enhancement structure, wherein the inner layer is the sensing optical fiber, the middle layer is the water absorption expansion material tightly wrappingthe inner-layer optical fiber, and the outer layer is the stress enhancement structure. The sensing device is arranged inside a cable, when water enters the cable, the moisture is absorbed by the middle-layer material and the middle-layer material is expanded, the extrusion effect on the inner-layer sensing optical fiber after water absorption and expansion is enhanced under the constraint actionof the outer-layer stress enhancement structure, the propagation characteristics of an optical signal in the optical fiber are changed, and on-line monitoring of inside water inlet condition of the cable is realized by analyzing the propagation characteristics of the signal of the optical fiber. The sensing device adopts a built-in mode, so that the sensitivity of monitoring and the accuracy of monitoring data are improved, and information support is provided for operation and maintenance of cable lines.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of cable lines, in particular to a power cable water ingress sensor device based on a stress-enhanced structure. Background technique [0002] With the rapid development of my country's economy and the rapid advancement of urban construction, the application of power cables is becoming more and more extensive. The cable has a multi-layer protective structure, and after adopting the correct installation process and laying process, there should be no moisture inside. However, statistics on cable faults in recent years have found that most of the faulty cables generally have internal water ingress, which leads to corrosion of the copper shielding layer and even the cable core. Water entering the power cable will cause water trees to form on the insulating layer, seriously reducing the insulation level of the cable. At the same time, water entering will cause internal metal corrosion and l...

AI Technical Summary

Problems solved by technology

The sensing device can monitor the water inflow inside the running cable in real time, and can be installed on the inner layer structure of the cable during the cable production process according to the needs. The problem of water monitoring device and method, using this device and method can provide information support for the operation and maintenance of cable lines

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