Intelligent flat encircling type temperature monitoring single-core cable based on optical fiber grating

Abstract

The invention discloses an intelligent flat encircling type temperature monitoring single-core cable based on an optical fiber grating. Conductors are located at the center of a cable core, the external parts of the conductors are wrapped by an insulating layer, an optical fiber sensing unit comprises a grating optical fiber and a protection tube arranged at the external part of the grating optical fiber in a sleeved manner, the optical fiber sensing unit and a plurality of filling strips are distributed at the external part of the insulating layer in a circumferential manner to form a cable core with a circular cross section, each filling strip is formed by enclosure of an inner wall, an outer wall and two sidewalls, and the sidewalls of each two adjacent filling strips are abutted against each other. According to the intelligent flat encircling type temperature monitoring single-core cable based on the optical fiber grating with an optimized design, the structure and the design are reasonable, the grating optical fiber is arranged in the cable core, the temperature of the cable can be rapidly and accurately monitored through detection of the change of a traveling path of light inthe optical fiber, the filling strips in the cable core are designed in an optimized manner, on one hand, the cable core can be round, and on the other hand, the position of the optical fiber sensingunit is fixed during usage and the movement is avoided.

Description

technical field [0001] The invention relates to the field of cable technology, in particular to an intelligent flat wrap-around temperature monitoring single-core cable based on a fiber grating. Background technique [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 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....

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

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