Intelligent double wire center temperature monitoring single core cable based on fiber grating

Abstract

The invention discloses an intelligent double wire center temperature monitoring single core cable based on a fiber grating. A cable core comprises multiple leads and one fiber sensing unit, wherein the fiber sensing unit comprises a tensile core, a grating fiber and a protective tube, the tensile core and the grating fiber are arranged in the protective tube, the grating fiber is arranged aroundthe tensile core, the cable core is externally wrapped in a wrapping layer, and the wrapping layer is externally wrapped in a sheath layer. The intelligent double wire center temperature monitoring single core cable based on the fiber grating is advantaged in that structure design is optimized and reasonable, through arranging the grating fiber among the leads of the cable core, change of the pathof light in the fiber is detected, rapid accurate monitoring of the cable temperature is carried out, moreover, the grating fiber is arranged around the tensile core, axial tensile strength of the grating fiber is guaranteed, and service life of the fiber is improved.

Description

technical field [0001] The invention relates to the field of cable technology, in particular to an intelligent double-wire central temperature monitoring single-core cable based on a fiber grating. Background technique [0002] During the operation of the cable, the wire will generate heat. Under the influence of excessive load, local defects, external environment and other factors, the heat of the cable wire will increase compared with normal conditions. Under long-term ultra-high temperature operation, the insulation material will age rapidly Brittle, the insulation is broken down, causing a short circuit, or even a fire, causing serious accidents. Usually, it is difficult to find potential defects in the way of cable laying during regular regular inspections, and often it is remedied only after a fault or even an accident has caused heavy losses. Optical fiber sensing technology has the advantages of electrical insulation and long transmission distance. However, in China...

AI Technical Summary

Problems solved by technology

[0002] During the operation of the cable, the conductor will generate heat. Under the influence of excessive load, local defects, external environment and other factors, the heat of the cable conductor will increase compared with normal conditions. Under long-term ultra-high temperature operation, the insulating material will rapidly age and become Brittle, the insulation is broken down, causing a short circuit, or even a fire, causing serious accidents

Usually, it is difficult to find potential defects in the way of cable laying during routine regular inspections, and often it is remedied only after a fault or even an accident has caused heavy losses.

Optical fiber sensing technology has the advantages of electrical insulation and long transmission distance. However, in China, the optical fiber is wound on the outside of the cable for temperature measurement, which causes the external temperature to greatly interfere with the test accuracy, and the actual test temperature is closer to the external temperature. Instead of the cable conductor operating temperature, the actual application effect is not good

In addition, when the optical fiber is subjected to external force, it also has a great influence on the temperature measurement accuracy of the optical fiber

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