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

Abstract

The invention discloses an intelligent double-wire encircling type temperature monitoring single-core cable based on an optical fiber grating. A cable core comprises a wire and optical fiber sensing units, the wire is located at the central part of the cable core, the wire comprises conductors and an insulating layer wrapping the external parts of the conductors, the optical fiber sensing units are located at the external part of the wire, each of the optical fiber sensing units comprises a tensile core, a grating optical fiber and a protection pipe, the tensile core and the grating optical fiber are located in the protection pipe, and the external part of the insulating layer is wrapped by filling materials to form a cable core with a circular cross section. According to the intelligent double-wire encircling type temperature monitoring single-core cable based on the optical fiber grating with an optimized design, the structure and the design are optimized and reasonable, the gratingoptical fibers used for monitoring the temperature are arranged in the cable core so that the temperature of the cable can be rapidly and accurately monitored, the grating optical fibers are arrangedaround the tensile core so that the axial tensile strength of the grating optical fiber can be guaranteed, and the cable core is filled with the filling materials so that it is effectively guaranteedthat during usage, the position of the optical fiber sensing unit is fixed and the movement is avoided.

Description

technical field [0001] The invention relates to the field of cable technology, in particular to an intelligent double-wire wrapping 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 dista...

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

Images