Optical fiber composite high-voltage cable with built-in humidity sensor

Abstract

The invention discloses an optical fiber composite high-voltage cable with a built-in humidity sensor. The cable comprises a cable body which comprises a water-blocking tape layer and at least one humidity sensor optical fiber, and the water-blocking tape layer is disposed in the cable body. The at least one humidity sensor optical fiber is arranged outside the water-blocking tape layer along theaxial direction of the cable body, and the humidity sensor optical fiber is used for detecting the internal humidity of the cable body. Through the built-in humidity sensor optical fiber, the cable has good electrical and mechanical properties and also has sensitive sensing characteristics, and the humidity sensor optical fiber is arranged in a metal shielding layer, so that electric field distribution in the cable cannot be distorted. During long-term operation, the humidity of the water-blocking tape layer can be monitored in real time through the humidity sensor optical fiber device, humidity factors influencing normal and stable operation of the cable are monitored, the operation reliability is improved, and a strong support is provided for constructing an electric power Internet-of-things sensing layer.

Description

technical field [0001] The invention relates to a cable in the research field of power transmission equipment, in particular to an optical fiber composite high-voltage cable with a built-in humidity sensor. Background technique [0002] At present, with the continuous development of economy and society, compared with overhead transmission lines, XLPE cables are widely used in urban network reconstruction due to their advantages of beautification of the city and low failure rate. Power cables are laid underground and are easily damaged by external forces such as municipal engineering, causing moisture intrusion. In order to prevent the insulation from being damp and produce water branches, the cable buffer layer is often used as a longitudinal water-blocking structure for high-voltage cables. However, recent studies have found that after long-term operation of cables in southern coastal areas, defects in the buffer layer are prone to occur, unknown white powder appears on th...

AI Technical Summary

Problems solved by technology

Among the first three sensors, traditional humidity sensors have poor measurement accuracy, electrolyte-type humidity sensors have poor stability and hysteresis, and ceramic-type humidity sensors have low sensitivity and large size, which are not suitable for online monitoring of power cable humidity

Polymer sensors can be divided into electrical characteristic sensors and optical characteristic sensors according to different parameters. Among them, electrical characteristic polymer sensors are easily affected by environmental factors and have poor stability.

However, polymer sensors with optical characteristics are generally used in aerospace and shipbuilding, biomedicine, engineering structure safety detection and other fields, and have not been used in power cables.

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